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Each option that was outstanding immediately prior to the consummation of the merger, and scheduled to vest on or after January 1, 2026 was canceled and converted into a right to receive the cash value of the option, such cash value of the option to be paid on the last day of the calendar quarter preceding the quarter in which such option would have otherwise vested in accordance with the vesting schedule in effect immediately prior to the consummation of the merger, less any applicable withholding taxes, subject to acceleration in certain circumstances."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F15","text":"This option represents an aggregate cash value of $986,081.25, representing the difference between the exercise price of the option and $113.00."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F14","text":"Includes 0 shares of Common Stock underlying the options that are unvested and scheduled to vest on or prior to December 31, 2025, and 10,312 shares of Common Stock underlying the options that are unvested and scheduled to vest on or after January 1, 2026."}],"balance_after":0,"derivative":{"exercise_price":65.19,"expiration_date":"2033-03-02","underlying":"Class A Common Stock","underlying_shares":20625},"source":{"system":"sec-edgar","filing":"0000950170-25-045344","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000095017025045344/ownership.xml","form_type":"4"}},{"id":1190525,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock Option","published_at":"2025-03-26T16:42:43.000Z","date":"2025-03-26","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":24000,"price":67.09,"value":1610160.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On March 26, 2025, the Company was acquired by Siemens Industry Software Inc. (\"Siemens\") pursuant to the merger agreement entered into among the Company, Siemens, and Astra Merger Sub Inc., dated as of October 30, 2024."},{"field":"shares","element":"transactionShares","label":"F12","text":"Includes 12,000 shares of Common Stock underlying the options that are unvested and scheduled to vest on or prior to December 31, 2025, and 0 shares of Common Stock underlying the options that are unvested and scheduled to vest on or after January 1, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"Each option that was outstanding immediately prior to the consummation of the merger and was scheduled to vest on or before December 31, 2025 was vested, canceled and converted into the right to receive the cash value of the option.  Each option that was outstanding immediately prior to the consummation of the merger, and scheduled to vest on or after January 1, 2026 was canceled and converted into a right to receive the cash value of the option, such cash value of the option to be paid on the last day of the calendar quarter preceding the quarter in which such option would have otherwise vested in accordance with the vesting schedule in effect immediately prior to the consummation of the merger, less any applicable withholding taxes, subject to acceleration in certain circumstances."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F13","text":"This option represents an aggregate cash value of $1,610,160.00, representing the difference between the exercise price of the option and $113.00."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F12","text":"Includes 12,000 shares of Common Stock underlying the options that are unvested and scheduled to vest on or prior to December 31, 2025, and 0 shares of Common Stock underlying the options that are unvested and scheduled to vest on or after January 1, 2026."}],"balance_after":0,"derivative":{"exercise_price":45.91,"expiration_date":"2032-12-15","underlying":"Class A Common Stock","underlying_shares":24000},"source":{"system":"sec-edgar","filing":"0000950170-25-045344","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000095017025045344/ownership.xml","form_type":"4"}},{"id":1190524,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock Option","published_at":"2025-03-26T16:42:43.000Z","date":"2025-03-26","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":8000,"price":50.09,"value":400720.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On March 26, 2025, the Company was acquired by Siemens Industry Software Inc. (\"Siemens\") pursuant to the merger agreement entered into among the Company, Siemens, and Astra Merger Sub Inc., dated as of October 30, 2024."},{"field":"shares","element":"transactionShares","label":"F10","text":"Includes 0 shares of Common Stock underlying the options that are unvested and scheduled to vest on or prior to December 31, 2025, and 2,000 shares of Common Stock underlying the options that are unvested and scheduled to vest on or after January 1, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"Each option that was outstanding immediately prior to the consummation of the merger and was scheduled to vest on or before December 31, 2025 was vested, canceled and converted into the right to receive the cash value of the option.  Each option that was outstanding immediately prior to the consummation of the merger, and scheduled to vest on or after January 1, 2026 was canceled and converted into a right to receive the cash value of the option, such cash value of the option to be paid on the last day of the calendar quarter preceding the quarter in which such option would have otherwise vested in accordance with the vesting schedule in effect immediately prior to the consummation of the merger, less any applicable withholding taxes, subject to acceleration in certain circumstances."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F11","text":"This option represents an aggregate cash value of $400,720.00, representing the difference between the exercise price of the option and $113.00."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F10","text":"Includes 0 shares of Common Stock underlying the options that are unvested and scheduled to vest on or prior to December 31, 2025, and 2,000 shares of Common Stock underlying the options that are unvested and scheduled to vest on or after January 1, 2026."}],"balance_after":0,"derivative":{"exercise_price":62.91,"expiration_date":"2032-03-19","underlying":"Class A Common Stock","underlying_shares":8000},"source":{"system":"sec-edgar","filing":"0000950170-25-045344","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000095017025045344/ownership.xml","form_type":"4"}},{"id":1190523,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock Option","published_at":"2025-03-26T16:42:43.000Z","date":"2025-03-26","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":12000,"price":51.21,"value":614520.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On March 26, 2025, the Company was acquired by Siemens Industry Software Inc. (\"Siemens\") pursuant to the merger agreement entered into among the Company, Siemens, and Astra Merger Sub Inc., dated as of October 30, 2024."},{"field":"shares","element":"transactionShares","label":"F8","text":"Includes 0 shares of Common Stock underlying the options that are unvested and scheduled to vest on or prior to December 31, 2025, and 3,000 shares of Common Stock underlying the options that are unvested and scheduled to vest on or after January 1, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"Each option that was outstanding immediately prior to the consummation of the merger and was scheduled to vest on or before December 31, 2025 was vested, canceled and converted into the right to receive the cash value of the option.  Each option that was outstanding immediately prior to the consummation of the merger, and scheduled to vest on or after January 1, 2026 was canceled and converted into a right to receive the cash value of the option, such cash value of the option to be paid on the last day of the calendar quarter preceding the quarter in which such option would have otherwise vested in accordance with the vesting schedule in effect immediately prior to the consummation of the merger, less any applicable withholding taxes, subject to acceleration in certain circumstances."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F9","text":"This option represents an aggregate cash value of $614,520.00, representing the difference between the exercise price of the option and $113.00."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F8","text":"Includes 0 shares of Common Stock underlying the options that are unvested and scheduled to vest on or prior to December 31, 2025, and 3,000 shares of Common Stock underlying the options that are unvested and scheduled to vest on or after January 1, 2026."}],"balance_after":0,"derivative":{"exercise_price":61.79,"expiration_date":"2032-12-15","underlying":"Class A Common Stock","underlying_shares":12000},"source":{"system":"sec-edgar","filing":"0000950170-25-045344","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000095017025045344/ownership.xml","form_type":"4"}},{"id":1190522,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock Option","published_at":"2025-03-26T16:42:43.000Z","date":"2025-03-26","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":45000,"price":55.3,"value":2488500.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On March 26, 2025, the Company was acquired by Siemens Industry Software Inc. (\"Siemens\") pursuant to the merger agreement entered into among the Company, Siemens, and Astra Merger Sub Inc., dated as of October 30, 2024."},{"field":"shares","element":"transactionShares","label":"F5","text":"This option is fully vested."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"Each option that was outstanding immediately prior to the consummation of the merger and was scheduled to vest on or before December 31, 2025 was vested, canceled and converted into the right to receive the cash value of the option.  Each option that was outstanding immediately prior to the consummation of the merger, and scheduled to vest on or after January 1, 2026 was canceled and converted into a right to receive the cash value of the option, such cash value of the option to be paid on the last day of the calendar quarter preceding the quarter in which such option would have otherwise vested in accordance with the vesting schedule in effect immediately prior to the consummation of the merger, less any applicable withholding taxes, subject to acceleration in certain circumstances."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"This option represents an aggregate cash value of $2,488,500.00, representing the difference between the exercise price of the option and $113.00."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F5","text":"This option is fully vested."}],"balance_after":0,"derivative":{"exercise_price":57.7,"expiration_date":"2031-01-04","underlying":"Class A Common Stock","underlying_shares":45000},"source":{"system":"sec-edgar","filing":"0000950170-25-045344","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000095017025045344/ownership.xml","form_type":"4"}},{"id":1190521,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2025-03-26T16:42:43.000Z","date":"2025-03-26","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":66125,"price":113,"value":7472125.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On March 26, 2025, the Company was acquired by Siemens Industry Software Inc. (\"Siemens\") pursuant to the merger agreement entered into among the Company, Siemens, and Astra Merger Sub Inc., dated as of October 30, 2024."},{"field":"shares","element":"transactionShares","label":"F2","text":"Includes 2,500 Class A Common Stock restricted stock units (\"RSUs\") that are unvested and scheduled to vest on or prior to December 31, 2025, and 36,955 RSUs that are unvested and scheduled to vest on or after January 1, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Upon the consummation of the merger, each issued and outstanding share of the Company's Class A Common Stock (\"Common Stock\") was canceled and converted into the right receive $113.00 in cash without interest. Each RSU that was granted under the Company's 2017 Equity Incentive Plan (the \"2017 Plan\") that was outstanding immediately prior to the consummation of the merger and was scheduled to vest on or before December 31, 2025 was vested, canceled and converted into the right to receive $113.00 in cash without interest."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"(continued from footnote 3) Each RSU that was granted under the 2017 Plan that was outstanding immediately prior to the consummation of the merger, and scheduled to vest on or after January 1, 2026 was canceled and converted into the right to receive $113.00 in cash without interest, and will be paid on the last day of the calendar quarter preceding the quarter in which such RSU would have otherwise vested in accordance with the vesting schedule in effect immediately prior to the consummation of the merger, less any applicable withholding taxes, subject to acceleration in certain circumstances."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000950170-25-045344","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000095017025045344/ownership.xml","form_type":"4"}},{"id":1218963,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2025-03-06T17:47:49.000Z","date":"2025-03-06","kind":"gift","planned":false,"acquired":false,"shares":2527,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On March 6, 2025 the reporting person donated 2,527 shares of Class A common stock directly owned by the reporting person to a donor-advised fund, which will use the gifted shares for charitable purposes."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 41,612 Class A Common Stock restricted stock units that are unvested."}],"balance_after":66125,"source":{"system":"sec-edgar","filing":"0001127602-25-008597","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000112760225008597/form4.xml","form_type":"4"}},{"id":1221469,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common 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unvested."}],"balance_after":69394,"source":{"system":"sec-edgar","filing":"0001127602-25-007093","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000112760225007093/form4.xml","form_type":"4"}},{"id":1266586,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2025-02-14T10:41:49.000Z","date":"2025-02-12","kind":"grant","planned":false,"acquired":true,"shares":17613,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On February 12, 2025,  the Reporting Person was granted 17,613 Class A Common Stock restricted stock units, which vest in 4 equal annual installments commencing February 12, 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 47,425 Class A Common Stock restricted stock units that are unvested."}],"balance_after":73205,"source":{"system":"sec-edgar","filing":"0001127602-25-004818","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000112760225004818/form4.xml","form_type":"4"}},{"id":1301303,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common 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restricted stock units that are unvested."}],"balance_after":55519,"source":{"system":"sec-edgar","filing":"0001127602-24-030013","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000112760224030013/form4.xml","form_type":"4"}},{"id":1453469,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2024-07-16T12:30:29.000Z","date":"2024-07-12","kind":"grant","planned":false,"acquired":true,"shares":83,"price":71.68,"value":5949.44,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares purchased under the Altair Engineering Inc. 2021 Employee Stock Purchase Plan in a transaction exempt under Rule 16b-3(c)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 38,562 Class A Common Stock restricted stock units that are unvested."}],"balance_after":56567,"source":{"system":"sec-edgar","filing":"0001127602-24-020479","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000112760224020479/form4.xml","form_type":"4"}},{"id":1567207,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering Inc.","symbol":"ALTR"},"owners":[{"id":19797,"kind":"person","name":"Brown Matthew Charles","position":1,"cik":"0001766979","reported_name":"Brown Matthew Charles","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2024-03-19T11:47:06.000Z","date":"2024-03-15","kind":"grant","planned":false,"acquired":true,"shares":21563,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"On March 15, 2024, the Reporting Person was granted 21,563 Class A Common Stock options, the options vest in 4 equal annual installments commencing March 15, 2025."}],"balance_after":21563,"derivative":{"exercise_price":79.03,"expiration_date":"2034-03-15","underlying":"Class A Common Stock","underlying_shares":21563},"source":{"system":"sec-edgar","filing":"0001127602-24-010555","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1701732/000112760224010555/form4.xml","form_type":"4"}},{"id":1567206,"issuer":{"id":81502,"kind":"organization","name":"Altair Engineering 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