{"transactions":[{"id":4633995,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62348,"kind":"person","name":"DEEGAN GLENN E.","position":1,"cik":"0001254044","reported_name":"DEEGAN GLENN E.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CAO, GC & Corp Secretary"}}],"security":"Common Stock","published_at":"2026-10-02T01:00:04.000Z","date":"2026-09-30","kind":"tax_withholding","planned":false,"acquired":false,"shares":1143,"price":5.48,"value":6263.64,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 2,748 shares of Common Stock and 63,285 RSUs."}],"balance_after":66033,"source":{"system":"sec-edgar","filing":"0001193125-26-410794","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526410794/ownership.xml","form_type":"4"}},{"id":4626605,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":88235,"kind":"organization","name":"Wood River Capital, LLC","position":1,"cik":"0001888978","reported_name":"Wood River Capital, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":71572,"kind":"person","name":"Koch, Inc.","position":2,"cik":"0002027344","reported_name":"Koch, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-09-25T00:59:30.000Z","date":"2026-09-23","kind":"sale","planned":false,"acquired":false,"shares":12280426,"price":4.73,"value":58086414.98,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The sale was executed in a single block trade at $4.73 per share."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"Wood River is beneficially owned by SCC Holdings, LLC (\"SCC\"), SCC is beneficially owned by KIM, LLC (\"KIM\"), KIM is beneficially owned by Koch Investments Group, LLC (\"KIG\"), KIG is beneficially owned by Koch Investments Group Holdings, LLC (\"KIGH\"), and KIGH is beneficially owned by Koch Industries, Inc. (\"Koch Industries\"), in each case by means of ownership of all voting equity instruments. Koch Industries, SCC, KIM, KIG, and KIGH may be deemed to beneficially own the shares of the Issuer's common stock beneficially owned by Wood River by virtue of (i) Koch Industries' beneficial ownership of KIGH, (ii) KIGH's beneficial ownership of KIG, (iii) KIG's beneficial ownership of KIM, (iv) KIM's beneficial ownership of SCC and (v) SCC's beneficial ownership of Wood River."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001193125-26-401380","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2027344/000119312526401380/ownership.xml","form_type":"4"}},{"id":725740,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":35238,"kind":"person","name":"NOGLOWS WILLIAM P","position":1,"cik":"0001201094","reported_name":"NOGLOWS WILLIAM P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2026-06-26T20:15:19.000Z","date":"2026-06-23","kind":"exercise","planned":false,"acquired":false,"shares":14799,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"These stock options were fully vested and exercisable."}],"balance_after":0,"derivative":{"exercise_price":4.75,"expiration_date":"2026-06-24","underlying":"Common Stock","underlying_shares":14799},"source":{"system":"sec-edgar","filing":"0001104659-26-078273","document":"tm2619095-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000110465926078273/tm2619095-1_4seq1.xml","form_type":"4"}},{"id":725739,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":35238,"kind":"person","name":"NOGLOWS WILLIAM P","position":1,"cik":"0001201094","reported_name":"NOGLOWS WILLIAM P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-26T20:15:19.000Z","date":"2026-06-23","kind":"exercise","planned":false,"acquired":true,"shares":14799,"price":4.75,"value":70295.25,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Represents 103,786 shares of Common Stock and 10,370 Restricted Stock Units."}],"balance_after":114156,"source":{"system":"sec-edgar","filing":"0001104659-26-078273","document":"tm2619095-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000110465926078273/tm2619095-1_4seq1.xml","form_type":"4"}},{"id":779566,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":31642,"kind":"person","name":"Mitchell Steven R","position":1,"cik":"0001610279","reported_name":"Mitchell Steven R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2026-05-14T21:30:11.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":8706,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."}],"balance_after":8706,"derivative":{"exercise_price":5.4,"expiration_date":"2036-05-13","underlying":"Common Stock","underlying_shares":8706},"source":{"system":"sec-edgar","filing":"0001193125-26-224377","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224377/ownership.xml","form_type":"4"}},{"id":779565,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":31642,"kind":"person","name":"Mitchell Steven R","position":1,"cik":"0001610279","reported_name":"Mitchell Steven R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-14T21:30:11.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 146,528 shares of Common Stock and 10,370 RSUs."}],"balance_after":156898,"source":{"system":"sec-edgar","filing":"0001193125-26-224377","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224377/ownership.xml","form_type":"4"}},{"id":779564,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":44485,"kind":"person","name":"SWEETNAM JAMES E","position":1,"cik":"0001188600","reported_name":"SWEETNAM JAMES E","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2026-05-14T21:30:08.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":8706,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."}],"balance_after":8706,"derivative":{"exercise_price":5.4,"expiration_date":"2036-05-13","underlying":"Common Stock","underlying_shares":8706},"source":{"system":"sec-edgar","filing":"0001193125-26-224375","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224375/ownership.xml","form_type":"4"}},{"id":779563,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":44485,"kind":"person","name":"SWEETNAM JAMES E","position":1,"cik":"0001188600","reported_name":"SWEETNAM JAMES E","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-14T21:30:08.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 25,951 shares of Common Stock and 10,370 RSUs."}],"balance_after":36321,"source":{"system":"sec-edgar","filing":"0001193125-26-224375","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224375/ownership.xml","form_type":"4"}},{"id":779560,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":35238,"kind":"person","name":"NOGLOWS WILLIAM P","position":1,"cik":"0001201094","reported_name":"NOGLOWS WILLIAM P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2026-05-14T21:30:06.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":8706,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."}],"balance_after":8706,"derivative":{"exercise_price":5.4,"expiration_date":"2036-05-13","underlying":"Common Stock","underlying_shares":8706},"source":{"system":"sec-edgar","filing":"0001193125-26-224374","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224374/ownership.xml","form_type":"4"}},{"id":779559,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":35238,"kind":"person","name":"NOGLOWS WILLIAM P","position":1,"cik":"0001201094","reported_name":"NOGLOWS WILLIAM P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-14T21:30:06.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 88,987 shares of Common Stock and 10,370 RSUs."}],"balance_after":99357,"source":{"system":"sec-edgar","filing":"0001193125-26-224374","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224374/ownership.xml","form_type":"4"}},{"id":779558,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":47412,"kind":"person","name":"Kool Kathleen","position":1,"cik":"0001934384","reported_name":"Kool Kathleen","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2026-05-14T21:30:04.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":8706,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."}],"balance_after":8706,"derivative":{"exercise_price":5.4,"expiration_date":"2036-05-13","underlying":"Common Stock","underlying_shares":8706},"source":{"system":"sec-edgar","filing":"0001193125-26-224373","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224373/ownership.xml","form_type":"4"}},{"id":779557,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":47412,"kind":"person","name":"Kool Kathleen","position":1,"cik":"0001934384","reported_name":"Kool Kathleen","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-14T21:30:04.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 23,953 shares of Common Stock and 10,370 RSUs."}],"balance_after":34323,"source":{"system":"sec-edgar","filing":"0001193125-26-224373","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224373/ownership.xml","form_type":"4"}},{"id":779562,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":47413,"kind":"person","name":"Robinson Cari","position":1,"cik":"0002031424","reported_name":"Robinson Cari","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2026-05-14T21:30:02.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":8706,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."}],"balance_after":8706,"derivative":{"exercise_price":5.4,"expiration_date":"2036-05-13","underlying":"Common Stock","underlying_shares":8706},"source":{"system":"sec-edgar","filing":"0001193125-26-224372","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224372/ownership.xml","form_type":"4"}},{"id":779561,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":47413,"kind":"person","name":"Robinson Cari","position":1,"cik":"0002031424","reported_name":"Robinson Cari","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-14T21:30:02.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 12,246 shares of Common Stock and 10,370 RSUs."}],"balance_after":22616,"source":{"system":"sec-edgar","filing":"0001193125-26-224372","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526224372/ownership.xml","form_type":"4"}},{"id":851656,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61821,"kind":"person","name":"Whitaker Corby C","position":1,"cik":"0001610273","reported_name":"Whitaker Corby C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Common Stock","published_at":"2026-03-10T21:00:13.000Z","date":"2026-03-08","kind":"tax_withholding","planned":false,"acquired":false,"shares":1924,"price":3.22,"value":6195.28,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"1. Shares withheld by Registrant to satisfy minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 128,170 shares of Common Stock and 77,145 RSUs."}],"balance_after":205315,"source":{"system":"sec-edgar","filing":"0001193125-26-100345","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526100345/ownership.xml","form_type":"4"}},{"id":851655,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61820,"kind":"person","name":"Thoele Grant Douglas","position":1,"cik":"0002089743","reported_name":"Thoele Grant Douglas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2026-03-10T21:00:08.000Z","date":"2026-03-08","kind":"tax_withholding","planned":false,"acquired":false,"shares":590,"price":3.22,"value":1899.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 10,111 shares of Common Stock and 67,621 RSUs."}],"balance_after":77732,"source":{"system":"sec-edgar","filing":"0001193125-26-100342","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526100342/ownership.xml","form_type":"4"}},{"id":851654,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-03-10T21:00:04.000Z","date":"2026-03-08","kind":"tax_withholding","planned":false,"acquired":false,"shares":4275,"price":3.22,"value":13765.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"1. Shares withheld by Registrant to satisfy minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 438,349 shares of Common Stock and 199,485 RSUs."}],"balance_after":637834,"source":{"system":"sec-edgar","filing":"0001193125-26-100349","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526100349/ownership.xml","form_type":"4"}},{"id":851652,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2026-03-10T21:00:02.000Z","date":"2026-03-08","kind":"tax_withholding","planned":false,"acquired":false,"shares":1924,"price":3.22,"value":6195.28,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 26,317 shares of Common Stock and 76,614 RSUs."}],"balance_after":102931,"source":{"system":"sec-edgar","filing":"0001193125-26-100339","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526100339/ownership.xml","form_type":"4"}},{"id":856500,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Options (Right to Buy)","published_at":"2026-03-06T22:00:29.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":212249,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."}],"balance_after":212249,"derivative":{"exercise_price":3.35,"expiration_date":"2036-03-04","underlying":"Common Stock","underlying_shares":212249},"source":{"system":"sec-edgar","filing":"0001193125-26-096830","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096830/ownership.xml","form_type":"4"}},{"id":856499,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:29.000Z","date":"2026-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":8618,"price":3.27,"value":28180.86,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 430,387 shares of Common Stock and 211,722 RSUs."}],"balance_after":642109,"source":{"system":"sec-edgar","filing":"0001193125-26-096830","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096830/ownership.xml","form_type":"4"}},{"id":856498,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:29.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":156716,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."}],"balance_after":650727,"source":{"system":"sec-edgar","filing":"0001193125-26-096830","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096830/ownership.xml","form_type":"4"}},{"id":856497,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operations and Strat Deve"}}],"security":"Stock Options (Right to Buy)","published_at":"2026-03-06T22:00:28.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":77824,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."}],"balance_after":77824,"derivative":{"exercise_price":3.35,"expiration_date":"2036-03-04","underlying":"Common Stock","underlying_shares":77824},"source":{"system":"sec-edgar","filing":"0001193125-26-096829","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096829/ownership.xml","form_type":"4"}},{"id":856496,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operations and Strat Deve"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:28.000Z","date":"2026-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":3814,"price":3.27,"value":12471.78,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 22,735 shares of Common Stock and 82,120 RSUs."}],"balance_after":104855,"source":{"system":"sec-edgar","filing":"0001193125-26-096829","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096829/ownership.xml","form_type":"4"}},{"id":856495,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operations and Strat Deve"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:28.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":57462,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."}],"balance_after":108669,"source":{"system":"sec-edgar","filing":"0001193125-26-096829","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096829/ownership.xml","form_type":"4"}},{"id":856494,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62348,"kind":"person","name":"DEEGAN GLENN E.","position":1,"cik":"0001254044","reported_name":"DEEGAN GLENN E.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CAO, GC & Corp Secretary"}}],"security":"Stock Options (Right to Buy)","published_at":"2026-03-06T22:00:15.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":75171,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The options vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."}],"balance_after":75171,"derivative":{"exercise_price":3.35,"expiration_date":"2036-03-04","underlying":"Common Stock","underlying_shares":75171},"source":{"system":"sec-edgar","filing":"0001193125-26-096823","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096823/ownership.xml","form_type":"4"}},{"id":856493,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62348,"kind":"person","name":"DEEGAN GLENN E.","position":1,"cik":"0001254044","reported_name":"DEEGAN GLENN E.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CAO, GC & Corp Secretary"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:15.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":55503,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 67,176 RSUs."}],"balance_after":67176,"source":{"system":"sec-edgar","filing":"0001193125-26-096823","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096823/ownership.xml","form_type":"4"}},{"id":856492,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61821,"kind":"person","name":"Whitaker Corby C","position":1,"cik":"0001610273","reported_name":"Whitaker Corby C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Sales and Marketing"}}],"security":"Stock Options (Right to Buy)","published_at":"2026-03-06T22:00:11.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":77824,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."}],"balance_after":77824,"derivative":{"exercise_price":3.35,"expiration_date":"2036-03-04","underlying":"Common Stock","underlying_shares":77824},"source":{"system":"sec-edgar","filing":"0001193125-26-096820","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096820/ownership.xml","form_type":"4"}},{"id":856491,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61821,"kind":"person","name":"Whitaker Corby C","position":1,"cik":"0001610273","reported_name":"Whitaker Corby C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Sales and Marketing"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:11.000Z","date":"2026-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":3907,"price":3.27,"value":12775.89,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 124,588 shares of Common Stock and 82,651 RSUs."}],"balance_after":207239,"source":{"system":"sec-edgar","filing":"0001193125-26-096820","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096820/ownership.xml","form_type":"4"}},{"id":856490,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61821,"kind":"person","name":"Whitaker Corby C","position":1,"cik":"0001610273","reported_name":"Whitaker Corby C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Sales and Marketing"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:11.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":57462,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."}],"balance_after":211146,"source":{"system":"sec-edgar","filing":"0001193125-26-096820","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096820/ownership.xml","form_type":"4"}},{"id":856489,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62347,"kind":"person","name":"Daniel Santhosh P","position":1,"cik":"0001935618","reported_name":"Daniel Santhosh P","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:06.000Z","date":"2026-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":986,"price":3.27,"value":3224.22,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 5,593 shares of Common Stock and 9,737 RSUs."}],"balance_after":15330,"source":{"system":"sec-edgar","filing":"0001193125-26-096817","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096817/ownership.xml","form_type":"4"}},{"id":856488,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61820,"kind":"person","name":"Thoele Grant Douglas","position":1,"cik":"0002089743","reported_name":"Thoele Grant Douglas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Stock Options (Right to Buy)","published_at":"2026-03-06T22:00:05.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":74893,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."}],"balance_after":74893,"derivative":{"exercise_price":3.35,"expiration_date":"2036-03-04","underlying":"Common Stock","underlying_shares":74893},"source":{"system":"sec-edgar","filing":"0001193125-26-096816","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096816/ownership.xml","form_type":"4"}},{"id":856487,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61820,"kind":"person","name":"Thoele Grant Douglas","position":1,"cik":"0002089743","reported_name":"Thoele Grant Douglas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:05.000Z","date":"2026-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":2368,"price":3.27,"value":7743.36,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 9,014 shares of Common Stock and 69,308 RSUs."}],"balance_after":78322,"source":{"system":"sec-edgar","filing":"0001193125-26-096816","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096816/ownership.xml","form_type":"4"}},{"id":856486,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61820,"kind":"person","name":"Thoele Grant Douglas","position":1,"cik":"0002089743","reported_name":"Thoele Grant Douglas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2026-03-06T22:00:05.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":55298,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029."}],"balance_after":80690,"source":{"system":"sec-edgar","filing":"0001193125-26-096816","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312526096816/ownership.xml","form_type":"4"}},{"id":962304,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61820,"kind":"person","name":"Thoele Grant Douglas","position":1,"cik":"0002089743","reported_name":"Thoele Grant Douglas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2025-12-19T22:15:04.000Z","date":"2025-10-01","kind":"grant","planned":false,"acquired":true,"shares":10273,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"This Form 4/A is being filed to correct the reported total of Securities Beneficially Owned following the reported transaction. The beneficially owned shares previously reported did not include 10,511 restricted stock units granted prior to the October 1, 2025, transaction date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 4,608 shares of Common Stock and 20,784 RSUs."}],"balance_after":25392,"source":{"system":"sec-edgar","filing":"0001193125-25-327079","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312525327079/ownership.xml","form_type":"4/A","original_submission_date":"2025-10-03"}},{"id":999172,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-11-14T22:00:04.000Z","date":"2025-11-13","kind":"sale","planned":true,"acquired":false,"shares":56845,"price":3.23,"value":183609.35,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transaction reported on this Form 4 was effected pursuant to a rule 10b5-1 trading plan. This plan was previously adopted by the reporting person on August 11, 2025, to sell a limited number of shares for tax purposes in connection with a one-time personal real estate transaction."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"These transactions were executed in multiple trades at prices ranging from $3.15 to $3.41. The reporting person will provide to the staff of the Securities and Exchange Commission, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 414,306 shares of Common Stock and 79,705 Restricted Stock Units."}],"balance_after":494011,"source":{"system":"sec-edgar","filing":"0001193125-25-283251","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312525283251/ownership.xml","form_type":"4"}},{"id":1025231,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61820,"kind":"person","name":"Thoele Grant Douglas","position":1,"cik":"0002089743","reported_name":"Thoele Grant Douglas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Performance Share Units","published_at":"2025-10-03T21:00:09.000Z","date":"2025-10-01","kind":"grant","planned":false,"acquired":true,"shares":20547,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":20547,"derivative":{"underlying":"Common Stock","underlying_shares":20547},"source":{"system":"sec-edgar","filing":"0001193125-25-230376","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312525230376/ownership.xml","form_type":"4"}},{"id":1025230,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61820,"kind":"person","name":"Thoele Grant Douglas","position":1,"cik":"0002089743","reported_name":"Thoele Grant Douglas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-10-03T21:00:09.000Z","date":"2025-10-01","kind":"grant","planned":false,"acquired":true,"shares":14563,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The options vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."}],"balance_after":14563,"derivative":{"exercise_price":7.3,"expiration_date":"2035-10-01","underlying":"Common Stock","underlying_shares":14563},"source":{"system":"sec-edgar","filing":"0001193125-25-230376","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312525230376/ownership.xml","form_type":"4"}},{"id":1025229,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61820,"kind":"person","name":"Thoele Grant Douglas","position":1,"cik":"0002089743","reported_name":"Thoele Grant Douglas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2025-10-03T21:00:09.000Z","date":"2025-10-01","kind":"grant","planned":false,"acquired":true,"shares":10273,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 4,608 shares of Common Stock and 10,273 RSUs."}],"balance_after":14881,"source":{"system":"sec-edgar","filing":"0001193125-25-230376","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312525230376/ownership.xml","form_type":"4"}},{"id":1027817,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62348,"kind":"person","name":"DEEGAN GLENN E.","position":1,"cik":"0001254044","reported_name":"DEEGAN GLENN E.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CAO, GC & Corp Secretary"}}],"security":"Performance Share Units","published_at":"2025-10-02T21:38:20.000Z","date":"2025-09-30","kind":"grant","planned":false,"acquired":true,"shares":23347,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":23347,"derivative":{"underlying":"Common Stock","underlying_shares":23347},"source":{"system":"sec-edgar","filing":"0001193125-25-228698","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312525228698/ownership.xml","form_type":"4"}},{"id":1027816,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62348,"kind":"person","name":"DEEGAN GLENN E.","position":1,"cik":"0001254044","reported_name":"DEEGAN GLENN E.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CAO, GC & Corp Secretary"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-10-02T21:38:20.000Z","date":"2025-09-30","kind":"grant","planned":false,"acquired":true,"shares":16416,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The options vest as to one-third of the shares on September 30, 2026, an additional one-third of the shares on September 30, 2027 and the remaining one-third of the shares on September 30, 2028."}],"balance_after":16416,"derivative":{"exercise_price":6.96,"expiration_date":"2035-09-30","underlying":"Common Stock","underlying_shares":16416},"source":{"system":"sec-edgar","filing":"0001193125-25-228698","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312525228698/ownership.xml","form_type":"4"}},{"id":1027815,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62348,"kind":"person","name":"DEEGAN GLENN E.","position":1,"cik":"0001254044","reported_name":"DEEGAN GLENN E.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CAO, GC & Corp Secretary"}}],"security":"Common Stock","published_at":"2025-10-02T21:38:20.000Z","date":"2025-09-30","kind":"grant","planned":false,"acquired":true,"shares":11673,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on September 30, 2026, an additional one-third of the shares on September 30, 2027 and the remaining one-third of the shares on September 30, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 11,673 RSUs."}],"balance_after":11673,"source":{"system":"sec-edgar","filing":"0001193125-25-228698","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312525228698/ownership.xml","form_type":"4"}},{"id":1040752,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62347,"kind":"person","name":"Daniel Santhosh P","position":1,"cik":"0001935618","reported_name":"Daniel Santhosh P","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2025-09-15T21:00:07.000Z","date":"2025-09-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":1563,"price":6.59,"value":10300.17,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"1. Shares withheld by Registrant to satisfy minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"2. Represents 3,761 shares of Common Stock and 12,555 RSUs."}],"balance_after":16316,"source":{"system":"sec-edgar","filing":"0001193125-25-203735","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000119312525203735/ownership.xml","form_type":"4"}},{"id":1046136,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":75699,"kind":"person","name":"Pittman Stephanie","position":1,"cik":"0001991670","reported_name":"Pittman Stephanie","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2025-09-08T21:01:24.000Z","date":"2025-09-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":1581,"price":6.61,"value":10450.41,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"1. Shares withheld by Registrant to satisfy minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"2. Represents 9,196 shares of Common Stock and 33,061 RSUs."}],"balance_after":42257,"source":{"system":"sec-edgar","filing":"0000950170-25-113594","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025113594/ownership.xml","form_type":"4"}},{"id":1068088,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62347,"kind":"person","name":"Daniel Santhosh P","position":1,"cik":"0001935618","reported_name":"Daniel Santhosh P","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2025-08-13T21:00:06.000Z","date":"2025-08-13","kind":"sale","planned":false,"acquired":false,"shares":2000,"price":7.54,"value":15080.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 17,879 Restricted Stock Units."}],"balance_after":17879,"source":{"system":"sec-edgar","filing":"0000950170-25-108149","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025108149/ownership.xml","form_type":"4"}},{"id":1068087,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62347,"kind":"person","name":"Daniel Santhosh P","position":1,"cik":"0001935618","reported_name":"Daniel Santhosh P","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2025-08-13T21:00:06.000Z","date":"2025-08-12","kind":"sale","planned":false,"acquired":false,"shares":4410,"price":7.31,"value":32237.1,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"These transactions were executed in multiple trades at prices ranging from $7.31 to $7.32. The reporting person will provide to the staff of the Securities and Exchange Commission, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":19879,"source":{"system":"sec-edgar","filing":"0000950170-25-108149","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025108149/ownership.xml","form_type":"4"}},{"id":1133788,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":79262,"kind":"person","name":"Johnson Virginia","position":1,"cik":"0001929494","reported_name":"Johnson Virginia","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CLO, GC, and Secretary"}}],"security":"Common Stock","published_at":"2025-05-27T19:11:57.000Z","date":"2025-05-23","kind":"tax_withholding","planned":false,"acquired":false,"shares":6129,"price":6.39,"value":39164.31,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The vesting of the restricted stock units was accelerated upon the Reporting Person's termination of employment on May 23, 2025. The accelerated vesting was in accordance with the terms of the Reporting Person's Executive Agreement, which provides for acceleration upon termination under certain circumstances."},{"field":"shares","element":"transactionShares","label":"F2","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 24,235 shares of Common Stock and 20,215 RSUs."}],"balance_after":44450,"source":{"system":"sec-edgar","filing":"0000950170-25-077611","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025077611/ownership.xml","form_type":"4"}},{"id":1152523,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-05-13T00:59:13.000Z","date":"2025-05-12","kind":"purchase","planned":false,"acquired":true,"shares":20000,"price":5.35,"value":107000.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Represents 471,151 shares of Common Stock and 79,705 RSUs."}],"balance_after":550856,"source":{"system":"sec-edgar","filing":"0000950170-25-069636","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025069636/ownership.xml","form_type":"4"}},{"id":1162697,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":31642,"kind":"person","name":"Mitchell Steven R","position":1,"cik":"0001610279","reported_name":"Mitchell Steven R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2025-05-02T00:52:09.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":9105,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."}],"balance_after":9105,"derivative":{"exercise_price":5.4,"expiration_date":"2035-04-30","underlying":"Common Stock","underlying_shares":9105},"source":{"system":"sec-edgar","filing":"0000950170-25-062218","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062218/ownership.xml","form_type":"4"}},{"id":1162696,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":31642,"kind":"person","name":"Mitchell Steven R","position":1,"cik":"0001610279","reported_name":"Mitchell Steven R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-02T00:52:09.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 136,158 shares of Common Stock and 10,370 RSUs"}],"balance_after":146528,"source":{"system":"sec-edgar","filing":"0000950170-25-062218","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062218/ownership.xml","form_type":"4"}},{"id":1162693,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":44485,"kind":"person","name":"SWEETNAM JAMES E","position":1,"cik":"0001188600","reported_name":"SWEETNAM JAMES E","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2025-05-02T00:51:53.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":9105,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."}],"balance_after":9105,"derivative":{"exercise_price":5.4,"expiration_date":"2035-04-30","underlying":"Common Stock","underlying_shares":9105},"source":{"system":"sec-edgar","filing":"0000950170-25-062217","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062217/ownership.xml","form_type":"4"}},{"id":1162692,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":44485,"kind":"person","name":"SWEETNAM JAMES E","position":1,"cik":"0001188600","reported_name":"SWEETNAM JAMES E","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-02T00:51:53.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 15,581 shares of Common Stock and 10,370 RSUs."}],"balance_after":25951,"source":{"system":"sec-edgar","filing":"0000950170-25-062217","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062217/ownership.xml","form_type":"4"}},{"id":1162695,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":47413,"kind":"person","name":"Robinson Cari","position":1,"cik":"0002031424","reported_name":"Robinson Cari","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2025-05-02T00:51:36.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":9105,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."}],"balance_after":9105,"derivative":{"exercise_price":5.4,"expiration_date":"2035-04-30","underlying":"Common Stock","underlying_shares":9105},"source":{"system":"sec-edgar","filing":"0000950170-25-062216","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062216/ownership.xml","form_type":"4"}},{"id":1162694,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":47413,"kind":"person","name":"Robinson Cari","position":1,"cik":"0002031424","reported_name":"Robinson Cari","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-02T00:51:36.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 1,876 shares of Common Stock and 10,370 RSUs."}],"balance_after":12246,"source":{"system":"sec-edgar","filing":"0000950170-25-062216","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062216/ownership.xml","form_type":"4"}},{"id":1162691,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":47412,"kind":"person","name":"Kool Kathleen","position":1,"cik":"0001934384","reported_name":"Kool Kathleen","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2025-05-02T00:51:20.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":9105,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."}],"balance_after":9105,"derivative":{"exercise_price":5.4,"expiration_date":"2035-04-30","underlying":"Common Stock","underlying_shares":9105},"source":{"system":"sec-edgar","filing":"0000950170-25-062215","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062215/ownership.xml","form_type":"4"}},{"id":1162690,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":47412,"kind":"person","name":"Kool Kathleen","position":1,"cik":"0001934384","reported_name":"Kool Kathleen","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-02T00:51:20.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 13,583 shares of Common Stock and 10,370 RSUs."}],"balance_after":23953,"source":{"system":"sec-edgar","filing":"0000950170-25-062215","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062215/ownership.xml","form_type":"4"}},{"id":1162689,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":35238,"kind":"person","name":"NOGLOWS WILLIAM P","position":1,"cik":"0001201094","reported_name":"NOGLOWS WILLIAM P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2025-05-02T00:51:00.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":9105,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy.\nThe options will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."}],"balance_after":9105,"derivative":{"exercise_price":5.4,"expiration_date":"2035-04-30","underlying":"Common Stock","underlying_shares":9105},"source":{"system":"sec-edgar","filing":"0000950170-25-062214","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062214/ownership.xml","form_type":"4"}},{"id":1162688,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":35238,"kind":"person","name":"NOGLOWS WILLIAM P","position":1,"cik":"0001201094","reported_name":"NOGLOWS WILLIAM P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-02T00:51:00.000Z","date":"2025-04-30","kind":"grant","planned":false,"acquired":true,"shares":10370,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person was granted Restricted Stock Units (\"RSUs\") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) April 30, 2026, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 78,617 shares of Common Stock and 10,370 RSUs."}],"balance_after":88987,"source":{"system":"sec-edgar","filing":"0000950170-25-062214","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025062214/ownership.xml","form_type":"4"}},{"id":1212946,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":79262,"kind":"person","name":"Johnson Virginia","position":1,"cik":"0001929494","reported_name":"Johnson Virginia","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CLO, GC, and Secretary"}}],"security":"Common Stock","published_at":"2025-03-11T22:50:48.000Z","date":"2025-03-07","kind":"tax_withholding","planned":false,"acquired":false,"shares":1924,"price":7.95,"value":15295.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 11,426 shares of Common Stock and 39,153 RSUs."}],"balance_after":50579,"source":{"system":"sec-edgar","filing":"0000950170-25-037451","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025037451/ownership.xml","form_type":"4"}},{"id":1212944,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-03-11T22:50:28.000Z","date":"2025-03-07","kind":"tax_withholding","planned":false,"acquired":false,"shares":3569,"price":7.95,"value":28373.55,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 451,151 shares of Common Stock and 79,705 RSUs."}],"balance_after":530856,"source":{"system":"sec-edgar","filing":"0000950170-25-037450","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025037450/ownership.xml","form_type":"4"}},{"id":1212943,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":82159,"kind":"person","name":"SCHILLING KEITH L","position":1,"cik":"0001628467","reported_name":"SCHILLING KEITH L","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Technology"}}],"security":"Common Stock","published_at":"2025-03-11T22:50:06.000Z","date":"2025-03-07","kind":"tax_withholding","planned":false,"acquired":false,"shares":1924,"price":7.95,"value":15295.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 14,223 shares of Common Stock and 35,574 RSUs."}],"balance_after":49797,"source":{"system":"sec-edgar","filing":"0000950170-25-037449","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025037449/ownership.xml","form_type":"4"}},{"id":1212942,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61821,"kind":"person","name":"Whitaker Corby C","position":1,"cik":"0001610273","reported_name":"Whitaker Corby C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Sales and Marketing"}}],"security":"Common Stock","published_at":"2025-03-11T22:49:47.000Z","date":"2025-03-07","kind":"tax_withholding","planned":false,"acquired":false,"shares":1924,"price":7.95,"value":15295.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 117,313 shares of Common Stock and 36,371 RSUs."}],"balance_after":153684,"source":{"system":"sec-edgar","filing":"0000950170-25-037447","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025037447/ownership.xml","form_type":"4"}},{"id":1212940,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61002,"kind":"person","name":"RODRIGUEZ RICARDO C.","position":1,"cik":"0001920996","reported_name":"RODRIGUEZ RICARDO C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2025-03-11T22:49:30.000Z","date":"2025-03-07","kind":"tax_withholding","planned":false,"acquired":false,"shares":1924,"price":7.95,"value":15295.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 6,591 shares of Common Stock and 50,720 RSUs."}],"balance_after":57311,"source":{"system":"sec-edgar","filing":"0000950170-25-037446","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025037446/ownership.xml","form_type":"4"}},{"id":1212941,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operations and Strat Deve"}}],"security":"Common Stock","published_at":"2025-03-11T22:49:17.000Z","date":"2025-03-07","kind":"tax_withholding","planned":false,"acquired":false,"shares":1924,"price":7.95,"value":15295.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 15,633 shares of Common Stock and 35,574 RSUs."}],"balance_after":51207,"source":{"system":"sec-edgar","filing":"0000950170-25-037445","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025037445/ownership.xml","form_type":"4"}},{"id":1217955,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62347,"kind":"person","name":"Daniel Santhosh P","position":1,"cik":"0001935618","reported_name":"Daniel Santhosh P","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Performance Share Units","published_at":"2025-03-07T21:50:26.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":9566,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":9566,"derivative":{"exercise_date":"2028-03-05","underlying":"Common Stock","underlying_shares":9566},"source":{"system":"sec-edgar","filing":"0000950170-25-035612","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035612/ownership.xml","form_type":"4"}},{"id":1217954,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62347,"kind":"person","name":"Daniel Santhosh P","position":1,"cik":"0001935618","reported_name":"Daniel Santhosh P","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-03-07T21:50:26.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":6742,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."}],"balance_after":6742,"derivative":{"exercise_price":7.84,"expiration_date":"2035-03-05","underlying":"Common Stock","underlying_shares":6742},"source":{"system":"sec-edgar","filing":"0000950170-25-035612","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035612/ownership.xml","form_type":"4"}},{"id":1217953,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62347,"kind":"person","name":"Daniel Santhosh P","position":1,"cik":"0001935618","reported_name":"Daniel Santhosh P","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2025-03-07T21:50:26.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":4783,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 6,410 shares of Common Stock and 17,879 RSUs."}],"balance_after":24289,"source":{"system":"sec-edgar","filing":"0000950170-25-035612","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035612/ownership.xml","form_type":"4"}},{"id":1217952,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":62347,"kind":"person","name":"Daniel Santhosh P","position":1,"cik":"0001935618","reported_name":"Daniel Santhosh P","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2025-03-07T21:50:26.000Z","date":"2025-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":428,"price":7.84,"value":3355.52,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."}],"balance_after":19506,"source":{"system":"sec-edgar","filing":"0000950170-25-035612","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035612/ownership.xml","form_type":"4"}},{"id":1217951,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operations and Strat Deve"}}],"security":"Performance Share Units","published_at":"2025-03-07T21:50:06.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":49426,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":49426,"derivative":{"exercise_date":"2028-03-05","underlying":"Common Stock","underlying_shares":49426},"source":{"system":"sec-edgar","filing":"0000950170-25-035609","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035609/ownership.xml","form_type":"4"}},{"id":1217950,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operations and Strat Deve"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-03-07T21:50:06.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":34837,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."}],"balance_after":34837,"derivative":{"exercise_price":7.84,"expiration_date":"2035-03-05","underlying":"Common Stock","underlying_shares":34837},"source":{"system":"sec-edgar","filing":"0000950170-25-035609","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035609/ownership.xml","form_type":"4"}},{"id":1217949,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operations and Strat Deve"}}],"security":"Common Stock","published_at":"2025-03-07T21:50:06.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":24713,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 12,050 shares of Common Stock and 41,081 RSUs."}],"balance_after":53131,"source":{"system":"sec-edgar","filing":"0000950170-25-035609","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035609/ownership.xml","form_type":"4"}},{"id":1217948,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operations and Strat Deve"}}],"security":"Common Stock","published_at":"2025-03-07T21:50:06.000Z","date":"2025-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":936,"price":7.84,"value":7338.24,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."}],"balance_after":28418,"source":{"system":"sec-edgar","filing":"0000950170-25-035609","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035609/ownership.xml","form_type":"4"}},{"id":1217947,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61002,"kind":"person","name":"RODRIGUEZ RICARDO C.","position":1,"cik":"0001920996","reported_name":"RODRIGUEZ RICARDO C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Performance share Units","published_at":"2025-03-07T21:49:15.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":79719,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":79719,"derivative":{"exercise_date":"2028-03-05","underlying":"Common Stock","underlying_shares":79719},"source":{"system":"sec-edgar","filing":"0000950170-25-035607","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035607/ownership.xml","form_type":"4"}},{"id":1217946,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61002,"kind":"person","name":"RODRIGUEZ RICARDO C.","position":1,"cik":"0001920996","reported_name":"RODRIGUEZ RICARDO C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-03-07T21:49:15.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":56189,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."}],"balance_after":56189,"derivative":{"exercise_price":7.84,"expiration_date":"2035-03-05","underlying":"Common Stock","underlying_shares":56189},"source":{"system":"sec-edgar","filing":"0000950170-25-035607","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035607/ownership.xml","form_type":"4"}},{"id":1217945,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61002,"kind":"person","name":"RODRIGUEZ RICARDO C.","position":1,"cik":"0001920996","reported_name":"RODRIGUEZ RICARDO C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2025-03-07T21:49:15.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":39859,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 3,008 shares of Common Stock and 56,227 RSUs."}],"balance_after":59235,"source":{"system":"sec-edgar","filing":"0000950170-25-035607","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035607/ownership.xml","form_type":"4"}},{"id":1217944,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61002,"kind":"person","name":"RODRIGUEZ RICARDO C.","position":1,"cik":"0001920996","reported_name":"RODRIGUEZ RICARDO C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2025-03-07T21:49:15.000Z","date":"2025-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":936,"price":7.84,"value":7338.24,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."}],"balance_after":19376,"source":{"system":"sec-edgar","filing":"0000950170-25-035607","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035607/ownership.xml","form_type":"4"}},{"id":1217943,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":79262,"kind":"person","name":"Johnson Virginia","position":1,"cik":"0001929494","reported_name":"Johnson Virginia","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CLO, GC, Secretary & CCO"}}],"security":"Performance Share Units","published_at":"2025-03-07T21:48:59.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":52614,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":52614,"derivative":{"exercise_date":"2028-03-05","underlying":"Common Stock","underlying_shares":52614},"source":{"system":"sec-edgar","filing":"0000950170-25-035606","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035606/ownership.xml","form_type":"4"}},{"id":1217942,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":79262,"kind":"person","name":"Johnson Virginia","position":1,"cik":"0001929494","reported_name":"Johnson Virginia","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CLO, GC, Secretary & CCO"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-03-07T21:48:59.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":37804,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."}],"balance_after":37804,"derivative":{"exercise_price":7.84,"expiration_date":"2035-03-05","underlying":"Common Stock","underlying_shares":37804},"source":{"system":"sec-edgar","filing":"0000950170-25-035606","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035606/ownership.xml","form_type":"4"}},{"id":1217941,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":79262,"kind":"person","name":"Johnson Virginia","position":1,"cik":"0001929494","reported_name":"Johnson Virginia","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CLO, GC, Secretary & CCO"}}],"security":"Common Stock","published_at":"2025-03-07T21:48:59.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":26307,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 7,843 shares of Common Stock and 44,660 RSUs."}],"balance_after":52503,"source":{"system":"sec-edgar","filing":"0000950170-25-035606","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035606/ownership.xml","form_type":"4"}},{"id":1217940,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":79262,"kind":"person","name":"Johnson Virginia","position":1,"cik":"0001929494","reported_name":"Johnson Virginia","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CLO, GC, Secretary & CCO"}}],"security":"Common Stock","published_at":"2025-03-07T21:48:59.000Z","date":"2025-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":936,"price":7.84,"value":7338.24,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."}],"balance_after":26196,"source":{"system":"sec-edgar","filing":"0000950170-25-035606","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035606/ownership.xml","form_type":"4"}},{"id":1217939,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Performance Share Units","published_at":"2025-03-07T21:48:40.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":108418,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":108418,"derivative":{"exercise_date":"2028-03-05","underlying":"Common Stock","underlying_shares":108418},"source":{"system":"sec-edgar","filing":"0000950170-25-035605","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035605/ownership.xml","form_type":"4"}},{"id":1217938,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-03-07T21:48:40.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":76417,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."}],"balance_after":76417,"derivative":{"exercise_price":7.84,"expiration_date":"2035-03-05","underlying":"Common Stock","underlying_shares":76417},"source":{"system":"sec-edgar","filing":"0000950170-25-035605","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035605/ownership.xml","form_type":"4"}},{"id":1217937,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-03-07T21:48:40.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":54209,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 442,484 shares of Common Stock and 91,941 RSUs."}],"balance_after":534425,"source":{"system":"sec-edgar","filing":"0000950170-25-035605","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035605/ownership.xml","form_type":"4"}},{"id":1217936,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-03-07T21:48:40.000Z","date":"2025-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":2316,"price":7.84,"value":18157.44,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."}],"balance_after":480216,"source":{"system":"sec-edgar","filing":"0000950170-25-035605","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035605/ownership.xml","form_type":"4"}},{"id":1217935,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":82159,"kind":"person","name":"SCHILLING KEITH L","position":1,"cik":"0001628467","reported_name":"SCHILLING KEITH L","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Technology"}}],"security":"Performance Share Units","published_at":"2025-03-07T21:46:43.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":49426,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":49426,"derivative":{"exercise_date":"2028-03-05","underlying":"Common Stock","underlying_shares":49426},"source":{"system":"sec-edgar","filing":"0000950170-25-035592","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035592/ownership.xml","form_type":"4"}},{"id":1217934,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":82159,"kind":"person","name":"SCHILLING KEITH L","position":1,"cik":"0001628467","reported_name":"SCHILLING KEITH L","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Technology"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-03-07T21:46:43.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":34837,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."}],"balance_after":34837,"derivative":{"exercise_price":7.84,"expiration_date":"2035-03-05","underlying":"Common Stock","underlying_shares":34837},"source":{"system":"sec-edgar","filing":"0000950170-25-035592","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035592/ownership.xml","form_type":"4"}},{"id":1217933,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":82159,"kind":"person","name":"SCHILLING KEITH L","position":1,"cik":"0001628467","reported_name":"SCHILLING KEITH L","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Technology"}}],"security":"Common Stock","published_at":"2025-03-07T21:46:43.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":24713,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 10,640 shares of Common Stock and 41,081 RSUs."}],"balance_after":51721,"source":{"system":"sec-edgar","filing":"0000950170-25-035592","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035592/ownership.xml","form_type":"4"}},{"id":1217932,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":82159,"kind":"person","name":"SCHILLING KEITH L","position":1,"cik":"0001628467","reported_name":"SCHILLING KEITH L","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Technology"}}],"security":"Common Stock","published_at":"2025-03-07T21:46:43.000Z","date":"2025-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":936,"price":7.84,"value":7338.24,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."}],"balance_after":27008,"source":{"system":"sec-edgar","filing":"0000950170-25-035592","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035592/ownership.xml","form_type":"4"}},{"id":1217931,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61821,"kind":"person","name":"Whitaker Corby C","position":1,"cik":"0001610273","reported_name":"Whitaker Corby C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Sales and Marketing"}}],"security":"Performance Share Units","published_at":"2025-03-07T21:46:30.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":51020,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":51020,"derivative":{"exercise_date":"2028-03-05","underlying":"Common Stock","underlying_shares":51020},"source":{"system":"sec-edgar","filing":"0000950170-25-035591","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035591/ownership.xml","form_type":"4"}},{"id":1217930,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61821,"kind":"person","name":"Whitaker Corby C","position":1,"cik":"0001610273","reported_name":"Whitaker Corby C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Sales and Marketing"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-03-07T21:46:30.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":35961,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."}],"balance_after":35961,"derivative":{"exercise_price":7.84,"expiration_date":"2035-03-05","underlying":"Common Stock","underlying_shares":35961},"source":{"system":"sec-edgar","filing":"0000950170-25-035591","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035591/ownership.xml","form_type":"4"}},{"id":1217929,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61821,"kind":"person","name":"Whitaker Corby C","position":1,"cik":"0001610273","reported_name":"Whitaker Corby C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Sales and Marketing"}}],"security":"Common Stock","published_at":"2025-03-07T21:46:30.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":25510,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 113,730 shares of Common Stock and 41,878 RSUs."}],"balance_after":155608,"source":{"system":"sec-edgar","filing":"0000950170-25-035591","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035591/ownership.xml","form_type":"4"}},{"id":1217928,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61821,"kind":"person","name":"Whitaker Corby C","position":1,"cik":"0001610273","reported_name":"Whitaker Corby C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Sales and Marketing"}}],"security":"Common Stock","published_at":"2025-03-07T21:46:30.000Z","date":"2025-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":936,"price":7.84,"value":7338.24,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."}],"balance_after":130098,"source":{"system":"sec-edgar","filing":"0000950170-25-035591","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035591/ownership.xml","form_type":"4"}},{"id":1217927,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":75699,"kind":"person","name":"Pittman Stephanie","position":1,"cik":"0001991670","reported_name":"Pittman Stephanie","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Human Resources Officer"}}],"security":"Performance Share Units","published_at":"2025-03-07T21:44:46.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":44642,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each performance share unit (\"PSU\") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index."}],"balance_after":44642,"derivative":{"exercise_date":"2028-03-05","underlying":"Common Stock","underlying_shares":44642},"source":{"system":"sec-edgar","filing":"0000950170-25-035581","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035581/ownership.xml","form_type":"4"}},{"id":1217926,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":75699,"kind":"person","name":"Pittman Stephanie","position":1,"cik":"0001991670","reported_name":"Pittman Stephanie","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Human Resources Officer"}}],"security":"Stock Options (Right to Buy)","published_at":"2025-03-07T21:44:46.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":31465,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."}],"balance_after":31465,"derivative":{"exercise_price":7.84,"expiration_date":"2035-03-05","underlying":"Common Stock","underlying_shares":31465},"source":{"system":"sec-edgar","filing":"0000950170-25-035581","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035581/ownership.xml","form_type":"4"}},{"id":1217925,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":75699,"kind":"person","name":"Pittman Stephanie","position":1,"cik":"0001991670","reported_name":"Pittman Stephanie","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2025-03-07T21:44:46.000Z","date":"2025-03-05","kind":"grant","planned":false,"acquired":true,"shares":22321,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Each Restricted Stock Unit (\"RSU\") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 5, 2026, an additional one-third of the shares on March 5, 2027 and the remaining one-third of the shares on March 5, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 5,392 shares of Common Stock and 38,446 RSUs."}],"balance_after":43838,"source":{"system":"sec-edgar","filing":"0000950170-25-035581","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035581/ownership.xml","form_type":"4"}},{"id":1217924,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":75699,"kind":"person","name":"Pittman Stephanie","position":1,"cik":"0001991670","reported_name":"Pittman Stephanie","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2025-03-07T21:44:46.000Z","date":"2025-03-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":936,"price":7.84,"value":7338.24,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."}],"balance_after":21517,"source":{"system":"sec-edgar","filing":"0000950170-25-035581","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025035581/ownership.xml","form_type":"4"}},{"id":1243728,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61002,"kind":"person","name":"RODRIGUEZ RICARDO C.","position":1,"cik":"0001920996","reported_name":"RODRIGUEZ RICARDO C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2025-02-26T21:55:43.000Z","date":"2025-02-25","kind":"tax_withholding","planned":false,"acquired":false,"shares":173,"price":7.46,"value":1290.58,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 1,267 shares of Common Stock and 19,045 RSUs."}],"balance_after":20312,"source":{"system":"sec-edgar","filing":"0000950170-25-027877","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025027877/ownership.xml","form_type":"4"}},{"id":1247058,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61817,"kind":"person","name":"Landes Gregg","position":1,"cik":"0001731877","reported_name":"Landes Gregg","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operations and Strat Deve"}}],"security":"Common Stock","published_at":"2025-02-26T01:57:51.000Z","date":"2025-02-21","kind":"tax_withholding","planned":false,"acquired":false,"shares":499,"price":8.04,"value":4011.96,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 10,309 shares of Common Stock and 19,045 RSUs."}],"balance_after":29354,"source":{"system":"sec-edgar","filing":"0000950170-25-027214","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025027214/ownership.xml","form_type":"4"}},{"id":1247057,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61819,"kind":"person","name":"Young Donald R","position":1,"cik":"0001610257","reported_name":"Young Donald R","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2025-02-26T01:56:08.000Z","date":"2025-02-21","kind":"tax_withholding","planned":false,"acquired":false,"shares":1108,"price":8.04,"value":8908.32,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 438,170 shares of Common Stock and 44,362 RSUs."}],"balance_after":482532,"source":{"system":"sec-edgar","filing":"0000950170-25-027210","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025027210/ownership.xml","form_type":"4"}},{"id":1247056,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":61002,"kind":"person","name":"RODRIGUEZ RICARDO C.","position":1,"cik":"0001920996","reported_name":"RODRIGUEZ RICARDO C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO & Treasurer"}}],"security":"Common Stock","published_at":"2025-02-26T01:55:35.000Z","date":"2025-02-21","kind":"tax_withholding","planned":false,"acquired":false,"shares":305,"price":8.04,"value":2452.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 946 shares of Common Stock and 19,539 RSUs."}],"balance_after":20485,"source":{"system":"sec-edgar","filing":"0000950170-25-027209","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025027209/ownership.xml","form_type":"4"}},{"id":1247055,"issuer":{"id":5645,"kind":"organization","name":"ASPEN AEROGELS INC","symbol":"ASPN"},"owners":[{"id":82159,"kind":"person","name":"SCHILLING KEITH L","position":1,"cik":"0001628467","reported_name":"SCHILLING KEITH L","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Technology"}}],"security":"Common Stock","published_at":"2025-02-26T01:52:27.000Z","date":"2025-02-21","kind":"tax_withholding","planned":false,"acquired":false,"shares":499,"price":8.04,"value":4011.96,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units (\"RSUs\")."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 8,899 shares of Common Stock and 19,045 RSUs."}],"balance_after":27944,"source":{"system":"sec-edgar","filing":"0000950170-25-027201","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017025027201/ownership.xml","form_type":"4"}}],"next_cursor":"2025-02-26T01:52:27.000000Z,1247055"}