{"transactions":[{"id":794185,"issuer":{"id":4799,"kind":"organization","name":"Seaport Therapeutics, Inc."},"owners":[{"id":50025,"kind":"person","name":"White Lauren","position":1,"cik":"0001864430","reported_name":"White Lauren","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Series B Preferred Stock","published_at":"2026-05-04T22:13:52.000Z","date":"2026-05-04","kind":"exercise","planned":false,"acquired":false,"shares":21052,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Lauren Anne White Living Trust, dated January 30, 2020"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series B Preferred Stock (the \"Preferred Stock\") was convertible into Common Stock of the Issuer on a one-for-3.1407 basis at the option of the holder, and automatically converted upon the closing of the Issuer's initial public offering without payment of further consideration. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series B Preferred Stock (the \"Preferred Stock\") was convertible into Common Stock of the Issuer on a one-for-3.1407 basis at the option of the holder, and automatically converted upon the closing of the Issuer's initial public offering without payment of further consideration. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series B Preferred Stock (the \"Preferred Stock\") was convertible into Common Stock of the Issuer on a one-for-3.1407 basis at the option of the holder, and automatically converted upon the closing of the Issuer's initial public offering without payment of further consideration. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Person disclaims beneficial ownership of such shares for purposes of Section 16 of the Exchange Act, except to the extent of her pecuniary interest therein, if any. This report shall not be deemed an admission that she is a beneficial owner of such shares for the purpose of Section 16 of the Exchange Act, or for any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":6702},"source":{"system":"sec-edgar","filing":"0001193125-26-204493","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2042347/000119312526204493/ownership.xml","form_type":"4"}},{"id":794184,"issuer":{"id":4799,"kind":"organization","name":"Seaport Therapeutics, Inc."},"owners":[{"id":50025,"kind":"person","name":"White Lauren","position":1,"cik":"0001864430","reported_name":"White Lauren","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2026-05-04T22:13:52.000Z","date":"2026-04-30","kind":"grant","planned":false,"acquired":true,"shares":63680,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The shares underlying this option shall vest in forty-eight (48) equal monthly installments following April 30, 2026, subject to the Reporting Person's continued service on each such vesting date."}],"balance_after":63680,"derivative":{"exercise_price":18,"expiration_date":"2036-04-29","underlying":"Common Stock","underlying_shares":63680},"source":{"system":"sec-edgar","filing":"0001193125-26-204493","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2042347/000119312526204493/ownership.xml","form_type":"4"}},{"id":794183,"issuer":{"id":4799,"kind":"organization","name":"Seaport Therapeutics, Inc."},"owners":[{"id":50025,"kind":"person","name":"White Lauren","position":1,"cik":"0001864430","reported_name":"White Lauren","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2026-05-04T22:13:52.000Z","date":"2026-05-04","kind":"exercise","planned":false,"acquired":true,"shares":6702,"ownership":{"direct":false,"nature":"By Lauren Anne White Living Trust, dated January 30, 2020"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series B Preferred Stock (the \"Preferred Stock\") was convertible into Common Stock of the Issuer on a one-for-3.1407 basis at the option of the holder, and automatically converted upon the closing of the Issuer's initial public offering without payment of further consideration. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The Reporting Person disclaims beneficial ownership of such shares for purposes of Section 16 of the Exchange Act, except to the extent of her pecuniary interest therein, if any. This report shall not be deemed an admission that she is a beneficial owner of such shares for the purpose of Section 16 of the Exchange Act, or for any other purpose."}],"balance_after":6702,"source":{"system":"sec-edgar","filing":"0001193125-26-204493","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2042347/000119312526204493/ownership.xml","form_type":"4"}},{"id":1650378,"issuer":{"id":94428,"kind":"organization","name":"ImmunoGen, Inc.","symbol":"IMGN"},"owners":[{"id":50025,"kind":"person","name":"White Lauren","position":1,"cik":"0001864430","reported_name":"White Lauren","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO AND PFO"}}],"security":"Restricted Stock 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Agreement that was outstanding immediately prior to the Effective Time was converted into a grant of restricted stock unit awards in respect of a number of shares of AbbVie common stock equal to the number of shares of Common Stock underlying such RSU as of immediately prior to the Effective Time multiplied by 0.18, and otherwise with the same terms and conditions that were applicable immediately prior to the Effective Time."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Pursuant to the Merger Agreement, at the Effective Time, each RSU granted on or after the date of the Merger Agreement that was outstanding immediately prior to the Effective Time was converted into a grant of restricted stock unit awards in respect of a number of shares of AbbVie common stock equal to the number of shares of Common Stock underlying such RSU as of immediately prior to the Effective Time multiplied by 0.18, and otherwise with the same terms and conditions that were applicable immediately prior to the Effective Time."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Pursuant to the Merger Agreement, at the Effective Time, each RSU granted on or after the date of the Merger Agreement that was outstanding immediately prior to the Effective Time was converted into a grant of restricted stock unit awards in respect of a number of shares of AbbVie common stock equal to the number of shares of Common Stock underlying such RSU as of immediately prior to the Effective Time multiplied by 0.18, and otherwise with the same terms and conditions that were applicable immediately prior to the Effective Time."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Pursuant to the Merger Agreement, at the Effective Time, each RSU granted on or after the date of the Merger Agreement that was outstanding immediately prior to the Effective Time was converted into a grant of restricted stock unit awards in respect of a number of shares of AbbVie common stock equal to the number of shares of Common Stock underlying such RSU as of immediately prior to the Effective Time multiplied by 0.18, and otherwise with the same terms and conditions that were applicable immediately prior to the Effective Time."}],"balance_after":0,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":19519},"source":{"system":"sec-edgar","filing":"0001104659-24-014698","document":"tm245865-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/855654/000110465924014698/tm245865-3_4seq1.xml","form_type":"4"}},{"id":1650377,"issuer":{"id":94428,"kind":"organization","name":"ImmunoGen, Inc.","symbol":"IMGN"},"owners":[{"id":50025,"kind":"person","name":"White Lauren","position":1,"cik":"0001864430","reported_name":"White 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in consideration of the cancellation of such RSU, an amount in cash (less any applicable withholding taxes) equal to (i) the number of shares of Common Stock subject to such RSU immediately prior to the Effective Time, multiplied by (ii) the Merger Consideration."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Pursuant to the Merger Agreement, at the Effective Time, each restricted stock unit (\"RSU\") granted prior to the date of the Merger Agreement that was outstanding immediately prior to the Effective Time was canceled, and the Reporting Person was entitled to receive (without interest), in consideration of the cancellation of such RSU, an amount in cash (less any applicable withholding taxes) equal to (i) the number of shares of Common Stock subject to such RSU immediately prior to the Effective Time, multiplied by (ii) the Merger Consideration."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Pursuant to the Merger Agreement, at the Effective Time, each restricted stock unit (\"RSU\") granted prior to the date of the Merger Agreement that was outstanding immediately prior to the Effective Time was canceled, and the Reporting Person was entitled to receive (without interest), in consideration of the cancellation of such RSU, an amount in cash (less any applicable withholding taxes) equal to (i) the number of shares of Common Stock subject to such RSU immediately prior to the Effective Time, multiplied by (ii) the Merger Consideration."}],"balance_after":0,"derivative":{"exercise_price":0,"underlying":"Common 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disposed of pursuant to the terms of the Agreement and Plan of Merger (the \"Merger Agreement\"), dated November 30, 2023, by and among the Issuer, AbbVie Inc., a Delaware corporation (\"AbbVie\"), Athene Subsidiary LLC, a Delaware limited liability company and wholly owned subsidiary of AbbVie (\"Intermediate Sub\"), and Athene Merger Sub Inc., a Massachusetts corporation and wholly owned subsidiary of Intermediate Sub (\"Purchaser\"), pursuant to which Purchaser merged with and into the Issuer with the Issuer continuing as the surviving corporation (the \"Merger\")."},{"field":"kind","element":"transactionCoding","label":"F2","text":"At the effective time of the Merger (the \"Effective Time\"), each option to purchase shares of common stock, par value $.01 per share, of the Issuer (\"Common Stock,\" and such option, a \"Stock Option\") granted prior to the date of the Merger Agreement that was outstanding immediately prior to the Effective Time was canceled and the Reporting Person was entitled to receive (without interest), in consideration of the cancellation of such Stock Option, an amount in cash (less any applicable withholding taxes) equal to (i) the total number of shares of Common Stock subject to such Stock Option immediately prior to the Effective Time, multiplied by (ii) the excess, if any, of $31.26, without interest (the \"Merger Consideration\") over the applicable exercise price per share of Common Stock under such Stock Option."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This Form 4 reports securities disposed of pursuant to the terms of the Agreement and Plan of Merger (the \"Merger Agreement\"), dated November 30, 2023, by and among the Issuer, AbbVie Inc., a Delaware corporation (\"AbbVie\"), Athene Subsidiary LLC, a Delaware limited liability company and wholly owned subsidiary of AbbVie (\"Intermediate Sub\"), and Athene Merger Sub Inc., a Massachusetts corporation and wholly owned subsidiary of Intermediate Sub (\"Purchaser\"), pursuant to which Purchaser merged with and into the Issuer with the Issuer continuing as the surviving corporation (the \"Merger\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"At the effective time of the Merger (the \"Effective Time\"), each option to purchase shares of common stock, par value $.01 per share, of the Issuer (\"Common Stock,\" and such option, a \"Stock Option\") granted prior to the date of the Merger Agreement that was outstanding immediately prior to the Effective Time was canceled and the Reporting Person was entitled to receive (without interest), in consideration of the cancellation of such Stock Option, an amount in cash (less any applicable withholding taxes) equal to (i) the total number of shares of Common Stock subject to such Stock Option immediately prior to the Effective Time, multiplied by (ii) the excess, if any, of $31.26, without interest (the \"Merger Consideration\") over the applicable exercise price per share of Common Stock under such Stock Option."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This Form 4 reports securities disposed of pursuant to the terms of the Agreement and Plan of Merger (the \"Merger Agreement\"), dated November 30, 2023, by and among the Issuer, AbbVie Inc., a Delaware corporation (\"AbbVie\"), Athene Subsidiary LLC, a Delaware limited liability company and wholly owned subsidiary of AbbVie (\"Intermediate Sub\"), and Athene Merger Sub Inc., a Massachusetts corporation and wholly owned subsidiary of Intermediate Sub (\"Purchaser\"), pursuant to which Purchaser merged with and into the Issuer with the Issuer continuing as the surviving corporation (the \"Merger\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"At the effective time of the Merger (the \"Effective Time\"), each option to purchase shares of common stock, par value $.01 per share, of the Issuer (\"Common Stock,\" and such option, a \"Stock Option\") granted prior to the date of the Merger Agreement that was outstanding immediately prior to the Effective Time was canceled and the Reporting Person was entitled to receive (without interest), in consideration of the cancellation of such Stock Option, an amount in cash (less any applicable withholding taxes) equal to (i) the total number of shares of Common Stock subject to such Stock Option immediately prior to the Effective Time, multiplied by (ii) the excess, if any, of $31.26, without interest (the \"Merger Consideration\") over the applicable exercise price per share of Common Stock under such Stock Option."}],"balance_after":0,"derivative":{"exercise_price":15.71,"expiration_date":"2033-09-18","underlying":"Common 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PRSUs vest upon satisfaction of certain discovery and clinical milestones."}],"balance_after":16500,"derivative":{"expiration_date":"2025-02-28","underlying":"Common Stock","underlying_shares":2250},"source":{"system":"sec-edgar","filing":"0001662579-23-000084","document":"wk-form4_1693512682.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1864430/000166257923000084/wk-form4_1693512682.xml","form_type":"4"}},{"id":1792061,"issuer":{"id":5503,"kind":"organization","name":"C4 Therapeutics, Inc.","symbol":"CCCC"},"owners":[{"id":50025,"kind":"person","name":"White Lauren","position":1,"cik":"0001864430","reported_name":"White Lauren","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common 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