REPLIGEN CORP — Director's Dealing 2023

May 9, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2023-03-24

Reporting Person: Madaus Martin D (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-03-24	Common Stock	L	11	$186.22	Acquired	11	Indirect
2023-05-04	Common Stock	P	500	$161.15	Acquired	611	Direct
2023-05-05	Common Stock	P	500	$159.19	Acquired	1111	Direct
2023-05-08	Common Stock	P	500	$156.18	Acquired	1611	Direct

Footnotes

F1: $186.22 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $160.14 to $218.40, 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.

F2: $161.15 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $160.85 to $161.29, 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: $159.19 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $158.96 to $159.38, 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.

F4: $156.18 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $156.10 to $156.22, 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.

F5: Shares held by a revocable trust of which the Reporting Person's spouse serves as trustee. Such shares were unintentionally omitted from the Form 3 originally filed by the Reporting Person on February 8, 2023, and were also omitted from a Form 4 subsequently filed by the Reporting Person on the same date. The Reporting Person disclaims beneficial ownership of such shares for purposes of Section 16 except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that such shares are beneficially owned by him for Section 16 or any other purpose.

F6: Held by a trust for which the Reporting Person is a trust advisor who shares voting and investment control.