Pax Margaret 4

4 · REPLIGEN CORP · Filed May 18, 2026

AI-generated summary of this filing

Updated May 18, 2026

Repligen (RGEN) Director Margaret Pax Receives RSU Awards

What Happened

Margaret Pax, a director of Repligen Corporation (RGEN), received equity awards on May 14, 2026: 995 restricted stock units (RSUs) and a derivative award of 2,239 units, for a total of 3,234 contingent shares. Both awards were granted at $0.00 for reporting purposes (no cash purchase). These are awards/grants (code A) and not open-market purchases or sales.

Key Details

Transaction date: May 14, 2026; Form 4 filed: May 18, 2026 (timely within the 2-business-day requirement).
Grant amounts: 995 RSUs (F1) and 2,239 derivative units (reported as A/derivative); total = 3,234 potential shares.
Reported acquisition price/value: $0.00 (standard for RSU grants reported as contingent awards).
Shares owned after transaction: not specified in the information provided in this summary.
Footnotes: F1 clarifies the 995 units are RSUs — each is a contingent right to one share and will be settled only in shares; F2 states the awards vest in full on the earlier of May 14, 2027, one year from grant, or the next annual shareholders’ meeting (date not yet determined).

Context

RSUs are contingent awards that convert to actual shares only upon vesting; they do not represent immediate free-trading stock and are generally used for compensation/retention.
Because these are grants (not purchases or sales), they are routine compensation-related insider transactions and should not be interpreted alone as a market sentiment signal.

Form 4

Period: 2026-05-14

Director

Transactions

Award
Common Stock
[F1]
2026-05-14+995→ 3,011 total
Award
Stock Option (Right to Buy)
[F2]
2026-05-14+2,239→ 2,239 total
Exercise: $103.38From: 2027-05-14Exp: 2036-05-14→ Common Stock (2,239 underlying)

Footnotes (2)

[F1]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.
[F2]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.

Signature

/s/ Jennifer Carmichael (Attorney in Fact)|2026-05-18

1 file