REPLIGEN CORP — Director's Dealing 2026

Jan 12, 2026

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2025-12-31

Reporting Person: Douglass Brian Robb (N/A)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	6252	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (Right to Buy)	$167.72	2034-05-07	Common Stock (2980)		Direct
Stock Option (Right to Buy)	$167.72	2034-05-07	Common Stock (7020)		Direct

Footnotes

F1: Represent restricted stock units that were awarded to represent a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock. 4,000 of the restricted stock units were granted on May 7, 2024 and vest in equal installments over a five-year period with each such vesting date occurring on the anniversary of the grant date. 2,252 of the restricted stock units were granted on March 1, 2025 and vest in equal installments over a four-year period with each such vesting date occurring on the anniversary of the grant date.

F2: The stock option was granted on May 7, 2024 and vest in equal installments over a five-year period with such vesting date occurring on the anniversary of the grant date. 596 shares have vested and the remaining shares will vest in equal installments on May 7, 2026, May 7, 2027, May 7, 2028 and May 7, 2029.

F3: The stock option was granted on May 7, 2024 and vest in equal installments over a five-year period with such vesting date occurring on the anniversary of the grant date. 1,404 shares have vested and the remaining shares will vest in equal installments on May 7, 2026, May 7, 2027, May 7, 2028 and May 7, 2029.