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Cahill Thomas

Disclosed activity across 1 company

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40560
SEC CIK
0001922939

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
Prime Medicine, Inc.PRME · Entity 5281DirectorJune 05, 2026June 08, 2026

Disclosed balances

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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.

Prime Medicine, Inc.

Report date June 05, 2026 · Filed June 08, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Stock Option (right to buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.06 · Expires 2036-06-05Direct75,000 Reported balance After 2026-06-05 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2026-06-05 · Grant · Acquired 75,000 · Balance 75,000

F1: The shares subject to this option shall vest in full upon the earlier of (i) June 5, 2027 or (ii) the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

Filing footnotes · ownership attribution and instrument terms

F1: The shares subject to this option shall vest in full upon the earlier of (i) June 5, 2027 or (ii) the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

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
June 05, 2026 Filed Jun 8, 2026 20:13 UTC Prime Medicine, Inc. PRME · Entity 5281 GrantStock Option (right to buy) · Derivative 75,000 $0.00 Strike: $3.06 $0.00
Disclosure

SEC source: 0001628280-26-041553 · wk-form4_1780949591.xml · derivative · entry 1

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Stock · 75,000 shares

Expires 2036-06-05

F1 · derivative.exercise_date: The shares subject to this option shall vest in full upon the earlier of (i) June 5, 2027 or (ii) the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

Read SEC document
August 01, 2025 Filed Aug 6, 2025 00:42 UTC Prime Medicine, Inc. PRME · Entity 5281 GrantStock Option (right to buy) · Derivative 45,000 Not disclosed Strike: $4.04 Not disclosed
Disclosure

SEC source: 0001894562-25-000044 · wk-form4_1754440963.xml · derivative · entry 4

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,000

Underlying: Common Stock · 45,000 shares

Expires 2034-06-12

F1 · kind: Effective as of August 1, 2025 (the "Repricing Date"), the Issuer's stockholders approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Stock Option and Grant Plan, as amended (the "2019 Plan") and/or the 2022 Stock Option and Incentive Plan (the "2022 Plan" and, together with the 2019 Plan, the "Plans"), which reduced the per share exercise price of each Repriced Option to $4.04, representing the closing price of the Issuer's common stock on The Nasdaq Global Market on the Repricing Date (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of August 1, 2025 (the "Repricing Date"), the Issuer's stockholders approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Stock Option and Grant Plan, as amended (the "2019 Plan") and/or the 2022 Stock Option and Incentive Plan (the "2022 Plan" and, together with the 2019 Plan, the "Plans"), which reduced the per share exercise price of each Repriced Option to $4.04, representing the closing price of the Issuer's common stock on The Nasdaq Global Market on the Repricing Date (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and/or the 2022 Plan, as applicable, and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
August 01, 2025 Filed Aug 6, 2025 00:42 UTC Prime Medicine, Inc. PRME · Entity 5281 Disposition to issuerStock Option (right to buy) · Derivative 45,000 Not disclosed Strike: $7.68 Not disclosed
Disclosure

SEC source: 0001894562-25-000044 · wk-form4_1754440963.xml · derivative · entry 3

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 45,000 shares

Expires 2034-06-12

F1 · kind: Effective as of August 1, 2025 (the "Repricing Date"), the Issuer's stockholders approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Stock Option and Grant Plan, as amended (the "2019 Plan") and/or the 2022 Stock Option and Incentive Plan (the "2022 Plan" and, together with the 2019 Plan, the "Plans"), which reduced the per share exercise price of each Repriced Option to $4.04, representing the closing price of the Issuer's common stock on The Nasdaq Global Market on the Repricing Date (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of August 1, 2025 (the "Repricing Date"), the Issuer's stockholders approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Stock Option and Grant Plan, as amended (the "2019 Plan") and/or the 2022 Stock Option and Incentive Plan (the "2022 Plan" and, together with the 2019 Plan, the "Plans"), which reduced the per share exercise price of each Repriced Option to $4.04, representing the closing price of the Issuer's common stock on The Nasdaq Global Market on the Repricing Date (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and/or the 2022 Plan, as applicable, and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
August 01, 2025 Filed Aug 6, 2025 00:42 UTC Prime Medicine, Inc. PRME · Entity 5281 GrantStock Option (right to buy) · Derivative 39,062 Not disclosed Strike: $4.04 Not disclosed
Disclosure

SEC source: 0001894562-25-000044 · wk-form4_1754440963.xml · derivative · entry 2

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,062

Underlying: Common Stock · 39,062 shares

Expires 2033-06-14

F1 · kind: Effective as of August 1, 2025 (the "Repricing Date"), the Issuer's stockholders approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Stock Option and Grant Plan, as amended (the "2019 Plan") and/or the 2022 Stock Option and Incentive Plan (the "2022 Plan" and, together with the 2019 Plan, the "Plans"), which reduced the per share exercise price of each Repriced Option to $4.04, representing the closing price of the Issuer's common stock on The Nasdaq Global Market on the Repricing Date (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of August 1, 2025 (the "Repricing Date"), the Issuer's stockholders approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Stock Option and Grant Plan, as amended (the "2019 Plan") and/or the 2022 Stock Option and Incentive Plan (the "2022 Plan" and, together with the 2019 Plan, the "Plans"), which reduced the per share exercise price of each Repriced Option to $4.04, representing the closing price of the Issuer's common stock on The Nasdaq Global Market on the Repricing Date (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and/or the 2022 Plan, as applicable, and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
August 01, 2025 Filed Aug 6, 2025 00:42 UTC Prime Medicine, Inc. PRME · Entity 5281 Disposition to issuerStock Option (right to buy) · Derivative 39,062 Not disclosed Strike: $14.83 Not disclosed
Disclosure

SEC source: 0001894562-25-000044 · wk-form4_1754440963.xml · derivative · entry 1

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 39,062 shares

Expires 2033-06-14

F1 · kind: Effective as of August 1, 2025 (the "Repricing Date"), the Issuer's stockholders approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Stock Option and Grant Plan, as amended (the "2019 Plan") and/or the 2022 Stock Option and Incentive Plan (the "2022 Plan" and, together with the 2019 Plan, the "Plans"), which reduced the per share exercise price of each Repriced Option to $4.04, representing the closing price of the Issuer's common stock on The Nasdaq Global Market on the Repricing Date (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of August 1, 2025 (the "Repricing Date"), the Issuer's stockholders approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Stock Option and Grant Plan, as amended (the "2019 Plan") and/or the 2022 Stock Option and Incentive Plan (the "2022 Plan" and, together with the 2019 Plan, the "Plans"), which reduced the per share exercise price of each Repriced Option to $4.04, representing the closing price of the Issuer's common stock on The Nasdaq Global Market on the Repricing Date (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and/or the 2022 Plan, as applicable, and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
June 04, 2025 Filed Jun 5, 2025 22:11 UTC Prime Medicine, Inc. PRME · Entity 5281 GrantStock Option (right to buy) · Derivative 55,000 $0.00 Strike: $1.32 $0.00
Disclosure

SEC source: 0001628280-25-029768 · wk-form4_1749161263.xml · derivative · entry 1

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,000

Underlying: Common Stock · 55,000 shares

Expires 2035-06-04

F1 · derivative.exercise_date: The shares subject to this option shall vest in full upon the earlier of (i) June 4, 2026 or (ii) the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

Read SEC document
June 12, 2024 Filed Jun 14, 2024 20:58 UTC Prime Medicine, Inc. PRME · Entity 5281 GrantStock Option (right to buy) · Derivative 45,000 $0.00 Strike: $7.68 $0.00
Disclosure

SEC source: 0001894562-24-000035 · wk-form4_1718398714.xml · derivative · entry 1

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,000

Underlying: Common Stock · 45,000 shares

Expires 2034-06-12

F1 · derivative.exercise_date: The shares subject to this option shall vest in full upon the earlier of (i) June 12, 2025 or (ii) the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

Read SEC document
June 14, 2023 Filed Jun 16, 2023 21:51 UTC Prime Medicine, Inc. PRME · Entity 5281 GrantStock Option (right to buy) · Derivative 39,062 $0.00 Strike: $14.83 $0.00
Disclosure

SEC source: 0001894562-23-000028 · wf-form4_168695226752131.xml · derivative · entry 1

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,062

Underlying: Common Stock · 39,062 shares

Expires 2033-06-14

F1 · derivative.exercise_date: The shares subject to this option shall vest in full upon the earlier of (i) June 14, 2024 or (ii) the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service to the Issuer through such vesting date.

Read SEC document
October 24, 2022 Filed Oct 27, 2022 00:00 UTC Prime Medicine, Inc. PRME · Entity 5281 ConversionSeries B Convertible Preferred Stock · Derivative 5,250,781 $0.00 $0.00
Disclosure

SEC source: 0001628280-22-027122 · wf-form4_166682881646748.xml · derivative · entry 4

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Newpath Partners, L.P.

Disclosed balance after: 0

Underlying: Common Stock · 1,689,005 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: The shares of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, the "Preferred Stock") were convertible into Common Stock on a one-for-3.10880 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on October 24, 2022. The Preferred Stock had no expiration date.

F1 · derivative.exercise_date: The shares of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, the "Preferred Stock") were convertible into Common Stock on a one-for-3.10880 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on October 24, 2022. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: The shares of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, the "Preferred Stock") were convertible into Common Stock on a one-for-3.10880 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on October 24, 2022. The Preferred Stock had no expiration date.

F2 · ownership.nature: Represents shares held directly by Newpath Partners, L.P. ("Newpath LP"). Newpath Partners GP, L.P. ("Newpath GP LP") is the general partner of Newpath LP. Newpath Partners GP, LLC ("Newpath GP LLC") is the general partner of Newpath GP LP. The Reporting Person is a managing member of Newpath GP LLC, and disclaims beneficial ownership of the shares held directly by Newpath LP except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that such shares are beneficially owned by him for Section 16 or any other purpose.

Read SEC document
October 24, 2022 Filed Oct 27, 2022 00:00 UTC Prime Medicine, Inc. PRME · Entity 5281 ConversionSeries A Convertible Preferred Stock · Derivative 9,999,999 $0.00 $0.00
Disclosure

SEC source: 0001628280-22-027122 · wf-form4_166682881646748.xml · derivative · entry 3

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Newpath Partners, L.P.

Disclosed balance after: 0

Underlying: Common Stock · 3,216,674 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: The shares of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, the "Preferred Stock") were convertible into Common Stock on a one-for-3.10880 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on October 24, 2022. The Preferred Stock had no expiration date.

F1 · derivative.exercise_date: The shares of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, the "Preferred Stock") were convertible into Common Stock on a one-for-3.10880 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on October 24, 2022. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: The shares of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, the "Preferred Stock") were convertible into Common Stock on a one-for-3.10880 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on October 24, 2022. The Preferred Stock had no expiration date.

F2 · ownership.nature: Represents shares held directly by Newpath Partners, L.P. ("Newpath LP"). Newpath Partners GP, L.P. ("Newpath GP LP") is the general partner of Newpath LP. Newpath Partners GP, LLC ("Newpath GP LLC") is the general partner of Newpath GP LP. The Reporting Person is a managing member of Newpath GP LLC, and disclaims beneficial ownership of the shares held directly by Newpath LP except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that such shares are beneficially owned by him for Section 16 or any other purpose.

Read SEC document
October 24, 2022 Filed Oct 27, 2022 00:00 UTC Prime Medicine, Inc. PRME · Entity 5281 PurchaseCommon Stock 400,000 $17.00 $6,800,000.00
Disclosure

SEC source: 0001628280-22-027122 · wf-form4_166682881646748.xml · nonDerivative · entry 2

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Newpath Partners, L.P.

Disclosed balance after: 5,305,679

F3 · shares: Reflects shares purchased by Newpath LP in the Issuer's initial public offering.

F2 · ownership.nature: Represents shares held directly by Newpath Partners, L.P. ("Newpath LP"). Newpath Partners GP, L.P. ("Newpath GP LP") is the general partner of Newpath LP. Newpath Partners GP, LLC ("Newpath GP LLC") is the general partner of Newpath GP LP. The Reporting Person is a managing member of Newpath GP LLC, and disclaims beneficial ownership of the shares held directly by Newpath LP except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that such shares are beneficially owned by him for Section 16 or any other purpose.

Read SEC document
October 24, 2022 Filed Oct 27, 2022 00:00 UTC Prime Medicine, Inc. PRME · Entity 5281 ConversionCommon Stock 4,905,679 Not disclosed Not disclosed
Disclosure

SEC source: 0001628280-22-027122 · wf-form4_166682881646748.xml · nonDerivative · entry 1

Cahill Thomas · CIK 0001922939 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Newpath Partners, L.P.

Disclosed balance after: 4,905,679

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: The shares of Series A Convertible Preferred Stock and Series B Convertible Preferred Stock (together, the "Preferred Stock") were convertible into Common Stock on a one-for-3.10880 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on October 24, 2022. The Preferred Stock had no expiration date.

F2 · ownership.nature: Represents shares held directly by Newpath Partners, L.P. ("Newpath LP"). Newpath Partners GP, L.P. ("Newpath GP LP") is the general partner of Newpath LP. Newpath Partners GP, LLC ("Newpath GP LLC") is the general partner of Newpath GP LP. The Reporting Person is a managing member of Newpath GP LLC, and disclaims beneficial ownership of the shares held directly by Newpath LP except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that such shares are beneficially owned by him for Section 16 or any other purpose.

Read SEC document

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