RGEN

SEC source: 0001628280-26-065462 · wk-form4_1791492005.xml · derivative · entry 2

Douglass Brian Robb · CIK 0002104618 · CHIEF PRODUCT OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 675

Underlying: Common Stock · 675 shares

Expires 2036-10-06

F2 · derivative.exercise_date: 225 shares will vest on each of October 6, 2027, October 6, 2028, and October 6, 2029.

SEC source: 0001628280-26-065462 · wk-form4_1791492005.xml · nonDerivative · entry 1

Douglass Brian Robb · CIK 0002104618 · CHIEF PRODUCT OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,685

F1 · shares: Mr. Douglass was awarded 700 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest in equal annual installments over a three-year period beginning on the first anniversary of the grant date. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001628280-26-065238 · wk-form4_1791317904.xml · derivative · entry 4

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 8,405

Underlying: Common Stock · 4,202 shares

Expires 2033-10-02

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

F2 · derivative.exercise_date: 4,202 shares will vest on October 2, 2027. 4,203 shares will vest on October 2, 2028.

SEC source: 0001628280-26-065238 · wk-form4_1791317904.xml · nonDerivative · entry 3

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 45,788

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-065238 · wk-form4_1791317904.xml · nonDerivative · entry 2

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 49,990

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-065238 · wk-form4_1791317904.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 45,788

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-064889 · wk-form4_1791230479.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,121

F1 · shares: Represents the number of shares withheld by the Issuer to satisfy tax withholding obligations of the reporting person that arose upon the release of restricted stock units.

SEC source: 0001628280-26-063714 · wk-form4_1790625949.xml · nonDerivative · entry 1

Garland Jason K · CIK 0001754555 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,408

F1 · shares: Represents the number of shares withheld by the Issuer to satisfy the tax withholding obligations of the reporting person that arose upon the release of restricted stock units.

SEC source: 0001628280-26-063572 · wk-form4_1790366980.xml · derivative · entry 6

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 9,085

Underlying: Common Stock · 4,542 shares

Expires 2035-03-01

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

F3 · derivative.exercise_date: 4,542 shares will vest on March 1, 2027, and 4,543 shares will vest on March 1, 2028.

SEC source: 0001628280-26-063572 · wk-form4_1790366980.xml · derivative · entry 5

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 12,607

Underlying: Common Stock · 8,404 shares

Expires 2033-10-02

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

F2 · derivative.exercise_date: 4,202 shares will vest on each of October 2, 2026, and October 2, 2027. 4,203 shares will vest on October 2, 2028.

SEC source: 0001628280-26-063572 · wk-form4_1790366980.xml · nonDerivative · entry 4

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 48,369

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-063572 · wk-form4_1790366980.xml · nonDerivative · entry 3

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 52,911

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-063572 · wk-form4_1790366980.xml · nonDerivative · entry 2

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 48,369

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-063572 · wk-form4_1790366980.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 56,773

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-063026 · wk-form4_1790107640.xml · derivative · entry 3

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 5,426

Underlying: Common Stock · 5,426 shares

Expires 2034-09-03

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-063026 · wk-form4_1790107640.xml · nonDerivative · entry 2

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 48,369

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-063026 · wk-form4_1790107640.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 53,795

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-060911 · wk-form4_1788898417.xml · nonDerivative · entry 2

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 48,369

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-060911 · wk-form4_1788898417.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 51,404

F1 · shares: Represents the number of shares withheld by the Issuer to satisfy the tax withholding obligations of the reporting person that arose upon the release of restricted stock units.

SEC source: 0001628280-26-060105 · wk-form4_1788380307.xml · nonDerivative · entry 2

Hughes Violetta · CIK 0001991429 · CHIEF ACCOUNTING OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,331

F2 · shares: Represents the number of shares withheld by the Issuer to satisfy the tax withholding obligations of the reporting person that arose upon the release of restricted stock units.

SEC source: 0001628280-26-058417 · wk-form4_1787342788.xml · derivative · entry 3

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 10,852

Underlying: Common Stock · 5,426 shares

Expires 2034-09-03

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

F2 · derivative.exercise_date: 5,426 shares will vest on each of September 3, 2026, and September 3, 2027.

SEC source: 0001628280-26-058417 · wk-form4_1787342788.xml · nonDerivative · entry 2

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 54,246

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001628280-26-058417 · wk-form4_1787342788.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 59,672

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 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 19, 2025.

SEC source: 0001193125-26-307925 · ownership.xml · nonDerivative · entry 1

Garland Jason K · CIK 0001754555 · CFO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 18,829

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 8, 2025.

SEC source: 0001193125-26-285449 · ownership.xml · nonDerivative · entry 1

Garland Jason K · CIK 0001754555 · CFO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 19,359

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 8, 2025.

SEC source: 0001193125-26-228896 · ownership.xml · derivative · entry 4

Madaus Martin D · CIK 0001310268 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,239

Underlying: Common Stock · 2,239 shares

Expires 2036-05-14

F2 · derivative.exercise_date: Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

SEC source: 0001193125-26-228896 · ownership.xml · nonDerivative · entry 1

Madaus Martin D · CIK 0001310268 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,581

F1 · shares: Mr. Madaus was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The Reporting Person has elected to defer settlement of these restricted stock units pursuant to the Repligen Corporation Deferred Compensation Plan for Non-Employee Directors. Once vested, the shares will be issued in accordance with the Reporting Person's deferral election following the separation of the Reporting Person's service as a Director. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-228897 · ownership.xml · derivative · entry 2

Konstantinov Konstantin · CIK 0001774649 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,239

Underlying: Common Stock · 2,239 shares

Expires 2036-05-14

F2 · derivative.exercise_date: Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

SEC source: 0001193125-26-228897 · ownership.xml · nonDerivative · entry 1

Konstantinov Konstantin · CIK 0001774649 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,889

F1 · shares: Mr. Konstantinov was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-228893 · ownership.xml · derivative · entry 2

EGLINTON MANNER CARRIE · CIK 0001696776 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,239

Underlying: Common Stock · 2,239 shares

Expires 2036-05-14

F2 · derivative.exercise_date: Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

SEC source: 0001193125-26-228893 · ownership.xml · nonDerivative · entry 1

EGLINTON MANNER CARRIE · CIK 0001696776 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,461

F1 · shares: Ms. Manner was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-228888 · ownership.xml · derivative · entry 2

Mhatre Rohin · CIK 0001798735 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,239

Underlying: Common Stock · 2,239 shares

Expires 2036-05-14

F2 · derivative.exercise_date: Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

SEC source: 0001193125-26-228888 · ownership.xml · nonDerivative · entry 1

Mhatre Rohin · CIK 0001798735 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,014

F1 · shares: Mr. Mhatre was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-228886 · ownership.xml · derivative · entry 2

Pax Margaret · CIK 0001999772 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,239

Underlying: Common Stock · 2,239 shares

Expires 2036-05-14

F2 · derivative.exercise_date: Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

SEC source: 0001193125-26-228886 · ownership.xml · nonDerivative · entry 1

Pax Margaret · CIK 0001999772 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,011

F1 · shares: Ms. Pax was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-228891 · ownership.xml · derivative · entry 2

MUIR GLENN P · CIK 0001181190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,239

Underlying: Common Stock · 2,239 shares

Expires 2036-05-14

F2 · derivative.exercise_date: Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

SEC source: 0001193125-26-228891 · ownership.xml · nonDerivative · entry 1

MUIR GLENN P · CIK 0001181190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,051

F1 · shares: Mr. Muir was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The Reporting Person has elected to defer settlement of these restricted stock units pursuant to the Repligen Corporation Deferred Compensation Plan for Non-Employee Directors. Once vested, the shares will be issued in accordance with the Reporting Person's deferral election following the separation of the Reporting Person's service as a Director. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-228884 · ownership.xml · derivative · entry 2

DAWES KAREN A · CIK 0001261506 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,239

Underlying: Common Stock · 2,239 shares

Expires 2036-05-14

F2 · derivative.exercise_date: Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

SEC source: 0001193125-26-228884 · ownership.xml · nonDerivative · entry 1

DAWES KAREN A · CIK 0001261506 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,816

F1 · shares: Ms. Dawes was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-228883 · ownership.xml · derivative · entry 2

BARTHELEMY NICOLAS · CIK 0001283576 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,239

Underlying: Common Stock · 2,239 shares

Expires 2036-05-14

F2 · derivative.exercise_date: Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.

SEC source: 0001193125-26-228883 · ownership.xml · nonDerivative · entry 1

BARTHELEMY NICOLAS · CIK 0001283576 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,436

F1 · shares: Mr. Barthelemy was awarded 995 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest on the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The Reporting Person has elected to defer settlement of these restricted stock units pursuant to the Repligen Corporation Deferred Compensation Plan for Non-Employee Directors. Once vested, the shares will be issued in accordance with the Reporting Person's deferral election following the separation of the Reporting Person's service as a Director. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-214293 · ownership.xml · derivative · entry 2

MUIR GLENN P · CIK 0001181190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,434

Underlying: Common Stock · 2,434 shares

Expires 2027-05-18

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_date: This option is fully vested and exercisable.

SEC source: 0001193125-26-214293 · ownership.xml · nonDerivative · entry 1

MUIR GLENN P · CIK 0001181190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,056

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.

SEC source: 0001193125-26-214265 · ownership.xml · nonDerivative · entry 1

Douglass Brian Robb · CIK 0002104618 · CHIEF PRODUCT OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,985

F1 · shares: Represents the number of shares withheld by the Issuer to satisfy tax withholding obligations of the reporting person that arose upon the release of restricted stock units.

SEC source: 0001193125-26-169682 · ownership.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 54,246

F1 · price: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on August 19th, 2025.

SEC source: 0001193125-26-119047 · ownership.xml · derivative · entry 2

KURIYEL RALF · CIK 0001733143 · Senior VP, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,669

Underlying: Common Stock · 5,669 shares

Expires 2036-03-05

F2 · derivative.exercise_date: One third of the stock options will vest and become exercisable annually on March 5, 2027, March 5, 2028, and March 5, 2029.

SEC source: 0001193125-26-119047 · ownership.xml · nonDerivative · entry 1

KURIYEL RALF · CIK 0001733143 · Senior VP, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,062

F1 · shares: Mr. Kuriyel was awarded 5,284 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest in equal annual instalments over a three-year period beginning on the first anniversary of the grant date. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-119036 · ownership.xml · derivative · entry 2

Loeillot Olivier · CIK 0001995525 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,890

Underlying: Common Stock · 25,890 shares

Expires 2036-03-05

F2 · derivative.exercise_date: One third of the stock options will vest and become exercisable annually on March 5, 2027, March 5, 2028, and March 5, 2029.

SEC source: 0001193125-26-119036 · ownership.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,078

F1 · shares: Mr. Loeillot was awarded 24,134 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest in equal annual instalments over a three-year period beginning on the first anniversary of the grant date. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

SEC source: 0001193125-26-119034 · ownership.xml · derivative · entry 2

Bylund James · CIK 0001849642 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,315

Underlying: Common Stock · 8,315 shares

Expires 2036-03-05

F2 · derivative.exercise_date: One third of the stock options will vest and become exercisable annually on March 5, 2027, March 5, 2028, and March 5, 2029.