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person · Reporting owner

White Lauren

Disclosed activity across 3 companies

Tapewire entity
50025
SEC CIK
0001864430

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
C4 Therapeutics, Inc.CCCC · Entity 5503Chief Financial OfficerAugust 30, 2023August 31, 2023
Seaport Therapeutics, Inc.SPTX · Entity 4799Chief Financial OfficerApril 30, 2026May 04, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

C4 Therapeutics, Inc.

Report date August 30, 2023 · Filed August 31, 2023

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect32,686 Ending reported balance After 2023-08-30 transaction · row 2
2 source rows · reconciled sequence

Row 1 · 2023-08-30 · Exercise / conversion · Acquired 2,250 · Balance 33,347

F1: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

Row 2 · 2023-08-30 · Tax withholding · Disposed 661 · Balance 32,686

F2: Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of PRSUs and does not represent a sale by the Reporting Person.

Performance Restricted Stock UnitsSEC Table II · derivative / convertible security · Expires 2025-02-28Direct16,500 Reported balance After 2023-08-30 transaction · row 3 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 3 · 2023-08-30 · Exercise / conversion · Disposed 2,250 · Balance 16,500

F1: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

Filing footnotes · ownership attribution and instrument terms

F1: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

F2: Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of PRSUs and does not represent a sale by the Reporting Person.

Seaport Therapeutics, Inc.

Report date April 30, 2026 · Filed May 04, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeIndirectBy Lauren Anne White Living Trust, dated January 30, 20206,702 Reported balance After 2026-05-04 transaction · row 1 Account identity is unresolved; indirect or unspecified ownership is not merged.
1 source row

Row 1 · 2026-05-04 · Conversion · Acquired 6,702 · Balance 6,702

F1: 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.

F2: 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.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $18.00 · Expires 2036-04-29Direct63,680 Reported balance After 2026-04-30 transaction · row 2 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 2 · 2026-04-30 · Grant · Acquired 63,680 · Balance 63,680

F3: 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.

Series B Preferred StockSEC Table II · derivative / convertible securityIndirectBy Lauren Anne White Living Trust, dated January 30, 20200 Reported balance After 2026-05-04 transaction · row 3 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 3 · 2026-05-04 · Conversion · Disposed 21,052 · Balance 0

F1: 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.

F2: 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.

Filing footnotes · ownership attribution and instrument terms

F1: 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.

F2: 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.

F3: 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.

Past disclosures · reporting ended (1)

No longer tracked through insider filings. These historical balances do not imply present ownership or a zero position.

ImmunoGen, Inc.

Report date February 12, 2024 · Filed February 12, 2024

Section 16 reporting ended · disclosed 2024-02-12. Current position is not established by this disclosure.

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $15.71 · Expires 2033-09-18Direct0 Reported balance After 2024-02-12 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2024-02-12 · Disposition to issuer · Acquired 295,975 · Balance 0

F1: 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").

F2: 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.

Restricted Stock UnitSEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct0 Reported balance After 2024-02-12 transaction · row 2 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 2 · 2024-02-12 · Disposition to issuer · Acquired 51,625 · Balance 0

F3: 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.

Restricted Stock UnitSEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct0 Reported balance After 2024-02-12 transaction · row 3 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 3 · 2024-02-12 · Disposition to issuer · Acquired 19,519 · Balance 0

F4: 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.

Filing footnotes · ownership attribution and instrument terms

F1: 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").

F2: 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.

F3: 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.

F4: 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.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
May 04, 2026 Filed May 4, 2026 22:13 UTC Seaport Therapeutics, Inc. SPTX · Entity 4799 ConversionSeries B Preferred Stock · Derivative 21,052 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-204493 · ownership.xml · derivative · entry 3

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · By Lauren Anne White Living Trust, dated January 30, 2020

Disclosed balance after: 0

Underlying: Common Stock · 6,702 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · ownership.nature: 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.

Read SEC document
May 04, 2026 Filed May 4, 2026 22:13 UTC Seaport Therapeutics, Inc. SPTX · Entity 4799 ConversionCommon Stock 6,702 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-26-204493 · ownership.xml · nonDerivative · entry 1

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · By Lauren Anne White Living Trust, dated January 30, 2020

Disclosed balance after: 6,702

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: 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.

F2 · ownership.nature: 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.

Read SEC document
April 30, 2026 Filed May 4, 2026 22:13 UTC Seaport Therapeutics, Inc. SPTX · Entity 4799 GrantStock Option (Right to Buy) · Derivative 63,680 $0.00 Strike: $18.00 $0.00
Disclosure

SEC source: 0001193125-26-204493 · ownership.xml · derivative · entry 2

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63,680

Underlying: Common Stock · 63,680 shares

Expires 2036-04-29

F3 · derivative.exercise_date: 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.

Read SEC document
February 12, 2024 Filed Feb 12, 2024 16:37 UTC ImmunoGen, Inc. IMGN · Entity 94428 Disposition to issuerRestricted Stock Unit · Derivative 19,519 Not disclosed Strike: $0.00 Not disclosed
Disclosure

SEC source: 0001104659-24-014698 · tm245865-3_4seq1.xml · derivative · entry 3

White Lauren · CIK 0001864430 · SVP, CFO AND PFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 19,519 shares

Expires not disclosed

F4 · derivative.exercise_price: 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.

F4 · kind: 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.

F4 · price: 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.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

Read SEC document
February 12, 2024 Filed Feb 12, 2024 16:37 UTC ImmunoGen, Inc. IMGN · Entity 94428 Disposition to issuerRestricted Stock Unit · Derivative 51,625 Not disclosed Strike: $0.00 Not disclosed
Disclosure

SEC source: 0001104659-24-014698 · tm245865-3_4seq1.xml · derivative · entry 2

White Lauren · CIK 0001864430 · SVP, CFO AND PFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 51,625 shares

Expires not disclosed

F3 · derivative.exercise_price: 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.

F3 · kind: 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.

F3 · price: 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.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

Read SEC document
February 12, 2024 Filed Feb 12, 2024 16:37 UTC ImmunoGen, Inc. IMGN · Entity 94428 Disposition to issuerStock Option (Right to Buy) · Derivative 295,975 Not disclosed Strike: $15.71 Not disclosed
Disclosure

SEC source: 0001104659-24-014698 · tm245865-3_4seq1.xml · derivative · entry 1

White Lauren · CIK 0001864430 · SVP, CFO AND PFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 295,975 shares

Expires 2033-09-18

F1 · kind: 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").

F2 · kind: 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.

F1 · price: 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").

F2 · price: 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.

F1 · derivative.exercise_date: 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").

F2 · derivative.exercise_date: 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.

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February 01, 2024 Filed Feb 5, 2024 21:27 UTC ImmunoGen, Inc. IMGN · Entity 94428 GrantRestricted Stock Unit · Derivative 19,519 $0.00 Strike: $0.00 $0.00
Disclosure

SEC source: 0001415889-24-002762 · form4-02062024_020211.xml · derivative · entry 1

White Lauren · CIK 0001864430 · SVP, CFO AND PFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,519

Underlying: Common Stock · 19,519 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock.

F1 · price: Each restricted stock unit ("RSU") represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock.

F2 · derivative.exercise_date: The RSUs vest over a three-year period, with 33 1/3% of the RSUs vesting on each of the first three anniversaries of the date of grant, subject to continued service through each vesting date.

F2 · derivative.expiration_date: The RSUs vest over a three-year period, with 33 1/3% of the RSUs vesting on each of the first three anniversaries of the date of grant, subject to continued service through each vesting date.

Read SEC document
September 18, 2023 Filed Sep 19, 2023 17:39 UTC ImmunoGen, Inc. IMGN · Entity 94428 GrantRestricted Stock Unit · Derivative 51,625 $0.00 Strike: $0.00 $0.00
Disclosure

SEC source: 0001415889-23-013432 · form4-09192023_090937.xml · derivative · entry 2

White Lauren · CIK 0001864430 · SVP, CFO AND PFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,625

Underlying: Common Stock · 51,625 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock.

F3 · derivative.exercise_date: The RSUs vest over a four-year period, with 25% of the RSUs vesting on each of the first four anniversaries of the date of grant, subject to continued service through each vesting date.

F2 · derivative.expiration_date: Each restricted stock unit ("RSU") represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock.

Read SEC document
September 18, 2023 Filed Sep 19, 2023 17:39 UTC ImmunoGen, Inc. IMGN · Entity 94428 GrantStock Option (Right to Buy) · Derivative 295,975 $0.00 Strike: $15.71 $0.00
Disclosure

SEC source: 0001415889-23-013432 · form4-09192023_090937.xml · derivative · entry 1

White Lauren · CIK 0001864430 · SVP, CFO AND PFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 295,975

Underlying: Common Stock · 295,975 shares

Expires 2033-09-18

F1 · derivative.exercise_date: These options vest over a four-year period, with 25% of the shares vesting on the one-year anniversary of the date of grant, and thereafter an additional 6.25% of the shares vesting on each succeeding quarterly anniversary of the date of grant, subject to continued service through each vesting date.

Read SEC document
August 30, 2023 Filed Aug 31, 2023 20:11 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 Exercise / conversionPerformance Restricted Stock Units · Derivative 2,250 $0.00 $0.00
Disclosure

SEC source: 0001662579-23-000084 · wk-form4_1693512682.xml · derivative · entry 3

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,500

Underlying: Common Stock · 2,250 shares

Expires 2025-02-28

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

F1 · derivative.exercise_date: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

Read SEC document
August 30, 2023 Filed Aug 31, 2023 20:11 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 Tax withholdingCommon Stock 661 $2.93 $1,936.73
Disclosure

SEC source: 0001662579-23-000084 · wk-form4_1693512682.xml · nonDerivative · entry 2

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,686

F2 · kind: Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of PRSUs and does not represent a sale by the Reporting Person.

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August 30, 2023 Filed Aug 31, 2023 20:11 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 Exercise / conversionCommon Stock 2,250 Not disclosed Not disclosed
Disclosure

SEC source: 0001662579-23-000084 · wk-form4_1693512682.xml · nonDerivative · entry 1

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,347

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

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February 13, 2023 Filed Feb 15, 2023 21:44 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 GrantStock Option (Right to Buy) · Derivative 125,000 $0.00 Strike: $5.67 $0.00
Disclosure

SEC source: 0001662579-23-000035 · wf-form4_167649747523081.xml · derivative · entry 2

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,000

Underlying: Common Stock · 125,000 shares

Expires 2033-02-12

F2 · derivative.exercise_date: The shares underlying this option shall vest and become exercisable in sixteen equal quarterly installments following the grant date, with the first installment vesting on May 13, 2023.

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February 13, 2023 Filed Feb 15, 2023 21:44 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 GrantCommon Stock 26,000 $0.00 $0.00
Disclosure

SEC source: 0001662579-23-000035 · wf-form4_167649747523081.xml · nonDerivative · entry 1

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,097

F1 · shares: Represents restricted stock units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. The RSUs shall vest in four equal annual installments following the grant date, with the first installment vesting on February 13, 2024.

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January 30, 2023 Filed Feb 1, 2023 21:10 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 Exercise / conversionPerformance Restricted Stock Units · Derivative 3,750 $0.00 $0.00
Disclosure

SEC source: 0001662579-23-000023 · wf-form4_167528583720918.xml · derivative · entry 3

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,750

Underlying: Common Stock · 3,750 shares

Expires 2025-02-28

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

F1 · derivative.exercise_date: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

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January 30, 2023 Filed Feb 1, 2023 21:10 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 Tax withholdingCommon Stock 1,301 $7.78 $10,121.78
Disclosure

SEC source: 0001662579-23-000023 · wf-form4_167528583720918.xml · nonDerivative · entry 2

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,097

F2 · kind: Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of PRSUs and does not represent a sale by the Reporting Person.

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January 30, 2023 Filed Feb 1, 2023 21:10 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 Exercise / conversionCommon Stock 3,750 Not disclosed Not disclosed
Disclosure

SEC source: 0001662579-23-000023 · wf-form4_167528583720918.xml · nonDerivative · entry 1

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,398

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

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May 26, 2022 Filed Jun 14, 2022 20:45 UTC Amendment C4 Therapeutics, Inc. CCCC · Entity 5503 Tax withholdingCommon Stock 1,102 $7.01 $7,725.02
Disclosure

SEC source: 0001209191-22-036714 · doc4a.xml · nonDerivative · entry 1

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,648

F1 · kind: Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of performance restricted stock units and does not represent a sale by the Reporting Person.

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May 25, 2022 Filed May 27, 2022 20:15 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 Exercise / conversionPerformance Restricted Stock Units · Derivative 3,750 $0.00 $0.00
Disclosure

SEC source: 0001209191-22-032509 · doc4.xml · derivative · entry 2

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,500

Underlying: Common Stock · 3,750 shares

Expires 2025-02-28

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

F1 · derivative.exercise_date: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

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May 25, 2022 Filed May 27, 2022 20:15 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 Exercise / conversionCommon Stock 3,750 Not disclosed Not disclosed
Disclosure

SEC source: 0001209191-22-032509 · doc4.xml · nonDerivative · entry 1

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,750

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining PRSUs vest upon satisfaction of certain discovery and clinical milestones.

Read SEC document
February 14, 2022 Filed Feb 16, 2022 21:30 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 GrantPerformance Restricted Stock Units · Derivative 26,250 $0.00 $0.00
Disclosure

SEC source: 0001209191-22-010206 · doc4.xml · derivative · entry 2

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,250

Underlying: Common Stock · 26,250 shares

Expires 2025-02-28

F2 · derivative.exercise_price: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining 21,750 PRSUs shall vest upon satisfaction of certain discovery and clinical milestones.

F2 · derivative.exercise_date: Each performance restricted stock unit ("PRSU") represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. 4,500 PRSUs shall vest upon satisfaction of three escalating share price vesting milestones, and the remaining 21,750 PRSUs shall vest upon satisfaction of certain discovery and clinical milestones.

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February 14, 2022 Filed Feb 16, 2022 21:30 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 GrantStock Option (Right to Buy) · Derivative 100,000 $0.00 Strike: $22.71 $0.00
Disclosure

SEC source: 0001209191-22-010206 · doc4.xml · derivative · entry 1

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Stock · 100,000 shares

Expires 2032-02-13

F1 · derivative.exercise_date: The shares underlying this option shall vest and become exercisable in sixteen equal quarterly installments following the grant date, with the first installment vesting on May 14, 2022.

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June 21, 2021 Filed Jun 22, 2021 00:22 UTC C4 Therapeutics, Inc. CCCC · Entity 5503 GrantStock Option (Right to Buy) · Derivative 136,000 $0.00 Strike: $38.49 $0.00
Disclosure

SEC source: 0001209191-21-042299 · doc4.xml · derivative · entry 1

White Lauren · CIK 0001864430 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 136,000

Underlying: Common Stock · 136,000 shares

Expires 2031-06-20

F1 · derivative.exercise_date: 25% of this option shall vest and become exercisable on June 21, 2022, with the remainder vesting in 36 equal monthly installments thereafter.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.