{"transactions":[{"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":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":1412008,"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":"2024-09-09T10:05:07.000Z","date":"2024-09-05","kind":"tax_withholding","planned":false,"acquired":false,"shares":1734,"price":25.6,"value":44390.4,"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 3,651 shares of Common Stock and 18,802 RSUs."}],"balance_after":22453,"source":{"system":"sec-edgar","filing":"0000950170-24-104529","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017024104529/ownership.xml","form_type":"4"}},{"id":1589577,"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":"2024-03-07T21:53:29.000Z","date":"2024-03-05","kind":"grant","planned":false,"acquired":true,"shares":35249,"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, 2025, an additional one-third of the shares on March 5, 2026 and the remaining one-third of the shares on March 5, 2027."}],"balance_after":35249,"derivative":{"exercise_price":16.34,"expiration_date":"2034-03-05","underlying":"Common Stock","underlying_shares":35249},"source":{"system":"sec-edgar","filing":"0000950170-24-028109","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017024028109/ownership.xml","form_type":"4"}},{"id":1589576,"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":"2024-03-07T21:53:29.000Z","date":"2024-03-05","kind":"grant","planned":false,"acquired":true,"shares":8032,"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, 2025, an additional one-third of the shares on March 5, 2026 and the remaining one-third of the shares on March 5, 2027."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 24,187 RSUs."}],"balance_after":24187,"source":{"system":"sec-edgar","filing":"0000950170-24-028109","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000095017024028109/ownership.xml","form_type":"4"}},{"id":1787591,"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 Option (Right to Buy)","published_at":"2023-09-06T14:00:19.000Z","date":"2023-09-05","kind":"grant","planned":false,"acquired":true,"shares":72754,"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 5, 2024, an additional one-third of the shares on September 5, 2025, and the remaining one-third of the shares on September 5, 2026."}],"balance_after":72754,"derivative":{"exercise_price":6.19,"expiration_date":"2033-09-05","underlying":"Common Stock","underlying_shares":72754},"source":{"system":"sec-edgar","filing":"0001209191-23-048265","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000120919123048265/doc4.xml","form_type":"4"}},{"id":1787590,"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":"2023-09-06T14:00:19.000Z","date":"2023-09-05","kind":"grant","planned":false,"acquired":true,"shares":16155,"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 5, 2024, an additional one-third of the shares on September 5, 2025, and the remaining one-third of the shares on September 5, 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 16,155 RSUs."}],"balance_after":16155,"source":{"system":"sec-edgar","filing":"0001209191-23-048265","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1145986/000120919123048265/doc4.xml","form_type":"4"}}]}