RGEN

SEC source: 0000950170-25-031547 · ownership.xml · derivative · entry 2

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,627

Underlying: Common Stock · 13,627 shares

Expires 2035-03-03

F2 · derivative.exercise_date: One third of the stock options will vest and become exercisable annually on March 3, 2026, March 3, 2027, and March 3, 2028.

SEC source: 0000950170-25-031547 · ownership.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,693

F1 · shares: Mr. Loeillot was awarded 14,480 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: 0000950170-25-030097 · ownership.xml · nonDerivative · entry 1

Garland Jason K · CIK 0001754555 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,360

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 performance stock units.

SEC source: 0000950170-25-030080 · ownership.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,213

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 performance stock units.

SEC source: 0000950170-25-030066 · ownership.xml · nonDerivative · entry 1

Bylund James · CIK 0001849642 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,763

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 performance stock units.

SEC source: 0000950170-25-030063 · ownership.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,622

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 performance stock units.

SEC source: 0000950170-25-030051 · ownership.xml · nonDerivative · entry 1

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,443

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 performance stock units.

SEC source: 0000950170-25-026175 · ownership.xml · nonDerivative · entry 1

Bylund James · CIK 0001849642 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,048

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 performance stock units.

SEC source: 0000950170-25-026176 · ownership.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,013

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 performance stock units.

SEC source: 0000950170-25-026171 · ownership.xml · nonDerivative · entry 1

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 149,268

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 performance stock units.

SEC source: 0000950170-24-133812 · ownership.xml · derivative · entry 2

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,856

Underlying: Common Stock · 11,808 shares

Expires 2028-02-29

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: 11,808 of the shares underlying this option have vested. The remaining shares vest as follows: 2,952 shares on March 1, 2025, 2,952 shares on March 1, 2026, and 2,952 shares on March 1, 2027.

SEC source: 0000950170-24-133812 · ownership.xml · nonDerivative · entry 1

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 151,648

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: 0000950170-24-130266 · ownership.xml · derivative · entry 3

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 24,246 shares

Expires 2028-02-29

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.

F3 · derivative.exercise_date: This option is fully vested and exercisable.

SEC source: 0000950170-24-130266 · ownership.xml · nonDerivative · entry 2

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139,840

F1 · kind: Transaction undertaken consistent with a previously arranged transaction under the reporting person's Rule 10(b)5-1 trading plan, which expired on November 15, 2024.

F2 · price: $139.67 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.25 to $140.05, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-130266 · ownership.xml · nonDerivative · entry 1

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 164,086

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: 0000950170-24-129641 · ownership.xml · nonDerivative · entry 1

Garland Jason K · CIK 0001754555 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,676

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: 0000950170-24-129622 · ownership.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,556

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: 0000950170-24-129145 · ownership.xml · derivative · entry 2

MUIR GLENN P · CIK 0001181190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 19,000 shares

Expires 2025-09-14

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: 0000950170-24-129145 · ownership.xml · nonDerivative · entry 1

MUIR GLENN P · CIK 0001181190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,283

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: 0000950170-24-105742 · ownership.xml · derivative · entry 6

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 24,246

Underlying: Common Stock · 10,000 shares

Expires 2028-02-29

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.

F6 · derivative.exercise_date: This option is fully vested and exercisable.

SEC source: 0000950170-24-105742 · ownership.xml · nonDerivative · entry 5

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 139,840

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F5 · price: $146.67 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $146.49 to $146.76, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-105742 · ownership.xml · nonDerivative · entry 4

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 140,444

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F4 · price: $145.95 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $145.49 to $146.49, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-105742 · ownership.xml · nonDerivative · entry 3

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 151,167

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F3 · price: $144.88 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $144.45 to $145.41, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-105742 · ownership.xml · nonDerivative · entry 2

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 160,536

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F2 · price: $143.77 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $143.44 to $144.28, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-105742 · ownership.xml · nonDerivative · entry 1

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 162,031

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: 0000950170-24-103643 · ownership.xml · derivative · entry 2

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,278

Underlying: Common Stock · 16,278 shares

Expires 2034-09-03

F2 · derivative.exercise_date: One third of the stock options will vest and become exercisable annually on September 3, 2025, September 3, 2026, and September 3, 2027.

SEC source: 0000950170-24-103643 · ownership.xml · nonDerivative · entry 1

Loeillot Olivier · CIK 0001995525 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,417

F1 · shares: Mr. Loeillot was awarded 17,631 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: 0000950170-24-103577 · ownership.xml · derivative · entry 2

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,528

Underlying: Common Stock · 13,057 shares

Expires 2034-02-27

F1 · shares: On June 28, 2024 (the "Effective Date"), the Issuer and Mr. Hunt entered into an amendment (the "2024 Equity Award Amendment") to certain of Mr. Hunt's equity awards, pursuant to which, effective as of September 1, 2024, Mr. Hunt forfeited two thirds of the number of shares of the Issuer's Common Stock underlying the time-based restricted stock unit award, performance-based restricted stock unit awards and stock option granted to Mr. Hunt on February 27, 2024 that remain outstanding as of the Effective Date.

F2 · derivative.exercise_date: Pursuant to the 2024 Equity Award Amendment, one third of the remaining stock options will vest and become exercisable on February 27, 2025, February 27, 2026, and February 27, 2027.

SEC source: 0000950170-24-103577 · ownership.xml · nonDerivative · entry 1

Hunt Anthony · CIK 0001606030 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 152,031

F1 · shares: On June 28, 2024 (the "Effective Date"), the Issuer and Mr. Hunt entered into an amendment (the "2024 Equity Award Amendment") to certain of Mr. Hunt's equity awards, pursuant to which, effective as of September 1, 2024, Mr. Hunt forfeited two thirds of the number of shares of the Issuer's Common Stock underlying the time-based restricted stock unit award, performance-based restricted stock unit awards and stock option granted to Mr. Hunt on February 27, 2024 that remain outstanding as of the Effective Date.

SEC source: 0000950170-24-091156 · ownership.xml · derivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 175 shares

Expires 2030-02-27

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. Exhibit 24.1: Power of Attorney

SEC source: 0000950170-24-091156 · ownership.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,288

SEC source: 0000950170-24-091156 · ownership.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,463

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: 0000950170-24-091156 · ownership.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,288

SEC source: 0000950170-24-089553 · ownership.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,261

SEC source: 0000950170-24-089409 · ownership.xml · derivative · entry 2

MUIR GLENN P · CIK 0001181190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,000 shares

Expires 2025-09-14

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: 0000950170-24-089409 · ownership.xml · nonDerivative · entry 1

MUIR GLENN P · CIK 0001181190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,283

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: 0000950170-24-073840 · ownership.xml · nonDerivative · entry 1

BARTHELEMY NICOLAS · CIK 0001283576 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,668

SEC source: 0000950170-24-073858 · ownership.xml · nonDerivative · entry 2

Madaus Martin D · CIK 0001310268 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,613

F2 · price: $125.46 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $125.25 to $125.58, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate purchase price within the range.

F3 · ownership.direct: Held by a trust for which the Reporting Person is a trust advisor who shares voting and investment control.

SEC source: 0000950170-24-073858 · ownership.xml · nonDerivative · entry 1

Madaus Martin D · CIK 0001310268 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,913

F1 · price: $124.54 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $124.25 to $125.21, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate purchase price within the range.

F3 · ownership.direct: Held by a trust for which the Reporting Person is a trust advisor who shares voting and investment control.

SEC source: 0000950170-24-073836 · ownership.xml · nonDerivative · entry 1

Hunt Anthony · CIK 0001606030 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 165,177

SEC source: 0000950170-24-073829 · ownership.xml · derivative · entry 2

DAWES KAREN A · CIK 0001261506 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,953 shares

Expires 2029-05-15

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: 0000950170-24-073829 · ownership.xml · nonDerivative · entry 1

DAWES KAREN A · CIK 0001261506 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 88,170

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: 0000950170-24-063594 · ownership.xml · nonDerivative · entry 6

Hunt Anthony · CIK 0001606030 · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 163,177

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F7 · price: $171.03 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $170.87 to $171.23, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-063594 · ownership.xml · nonDerivative · entry 5

Hunt Anthony · CIK 0001606030 · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 164,146

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F6 · price: $170.04 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $169.81 to $170.76, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-063594 · ownership.xml · nonDerivative · entry 4

Hunt Anthony · CIK 0001606030 · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 168,071

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F5 · price: $169.27 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $168.80 to $169.78, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-063594 · ownership.xml · nonDerivative · entry 3

Hunt Anthony · CIK 0001606030 · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 171,034

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F4 · price: $168.33 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $167.75 to $168.74, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-063594 · ownership.xml · nonDerivative · entry 2

Hunt Anthony · CIK 0001606030 · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 174,967

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F3 · price: $167.05 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $166.73 to $167.72, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-063594 · ownership.xml · nonDerivative · entry 1

Hunt Anthony · CIK 0001606030 · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 178,975

F1 · kind: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 9, 2023.

F2 · price: $166.36 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $165.73 to $166.72, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-24-062623 · ownership.xml · derivative · entry 3

Madaus Martin D · CIK 0001310268 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,376

Underlying: Common Stock · 1,376 shares

Expires 2034-05-16

F2 · derivative.exercise_date: Award vests in full on the earlier of May 16, 2025, 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: 0000950170-24-062623 · ownership.xml · nonDerivative · entry 1

Madaus Martin D · CIK 0001310268 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,998

F1 · shares: Mr. Madaus was awarded 701 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 16, 2025, 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.