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These shares were sold in multiple transactions at prices ranging from $6.13 to $6.52, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the \"Company\"), any stockholder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":1526252,"source":{"system":"sec-edgar","filing":"0001477932-26-004177","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2026548/000147793226004177/form4.xml","form_type":"4"}},{"id":752287,"issuer":{"id":5371,"kind":"organization","name":"ASP Isotopes Inc.","symbol":"ASPI"},"owners":[{"id":33039,"kind":"person","name":"Kiessling Heather","position":1,"cik":"0002026548","reported_name":"Kiessling Heather","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2026-06-04T01:45:14.000Z","date":"2026-05-28","kind":"grant","planned":false,"acquired":true,"shares":840000,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":"This award of common stock shall vest (subject to compliance with applicable vesting conditions) in semi-annual installments over a four-year period beginning on the grant\ndate."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This award of common stock shall vest (subject to compliance with applicable vesting conditions) in semi-annual installments over a four-year period beginning on the grant\ndate."}],"balance_after":1549376,"source":{"system":"sec-edgar","filing":"0001477932-26-003630","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2026548/000147793226003630/form4.xml","form_type":"4"}},{"id":805889,"issuer":{"id":5371,"kind":"organization","name":"ASP Isotopes Inc.","symbol":"ASPI"},"owners":[{"id":33039,"kind":"person","name":"Kiessling Heather","position":1,"cik":"0002026548","reported_name":"Kiessling Heather","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2026-04-18T01:54:31.000Z","date":"2026-04-15","kind":"sale","planned":true,"acquired":false,"shares":23124,"price":5.478,"value":126673.272,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents \"sell to cover\" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on December 19, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.12 to $5.71, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the \"Company\"), any stockholder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in Footnote 2."}],"balance_after":709376,"source":{"system":"sec-edgar","filing":"0001477932-26-002388","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2026548/000147793226002388/form4.xml","form_type":"4"}},{"id":958452,"issuer":{"id":5371,"kind":"organization","name":"ASP Isotopes Inc.","symbol":"ASPI"},"owners":[{"id":33039,"kind":"person","name":"Kiessling Heather","position":1,"cik":"0002026548","reported_name":"Kiessling Heather","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2025-12-30T02:30:09.000Z","date":"2025-12-18","kind":"sale","planned":false,"acquired":false,"shares":80000,"price":5.798,"value":463840.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.73 to $5.885, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. 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