Company · Ownership research

REPLIGEN CORP RGEN

CIK 0000730272

Form 4 transactions dated Nov 1, 2023 to Nov 13, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 57 rows; the complete set is available through the API.

Insider filings on file run through Oct 8, 2026.

Insider purchases & sales

Purchased: $839.98K
Sold: $43.59M

Nov 1, 2023 – Oct 8, 2026
Available records · partial months are marked ·

202510 of 10 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Dec 17, 2025	DAWES KAREN A Director	Sale	$44.27K 275 shares sold	0.30% sold Direct holding	▾
Nov 25, 2025	Loeillot Olivier Chief Executive Officer · Director	Sale	$1.20M 7,041 shares sold	16.40% sold Direct holding	▾
Nov 18, 2025	Bylund James Chief Operating Officer	Sale	$331.30K 2,191 shares sold	9.24% sold Direct holding	▾
Nov 13, 2025	Hunt Anthony Director	Sale	$3.09M 20,000 shares sold	19.85% sold Direct holding	▾
Nov 12, 2025	Hunt Anthony Director	Sale	$3.92M 25,000 shares sold	19.88% sold Direct holding	▾
Sep 10, 2025	Hunt Anthony Director	Sale	$3.51M 29,111 shares sold	22.42% sold Direct holding	▾
Aug 8, 2025	Madaus Martin D Director	Purchase	$201.83K 1,800 shares bought	New holding Trust holding	▾
May 15, 2025	Hunt Anthony Director	Sale	$3.27M 26,447 shares sold	19.40% sold Direct holding	▾
Mar 17, 2025	Hunt Anthony Director	Sale	$4.08M 26,756 shares sold	16.41% sold Direct holding	▾
Mar 17, 2025	Pax Margaret Director	Purchase	$37.67K 250 shares bought	31.53% added Direct holding	▾

Showing 10 / 10 record groups in 2025. The complete set is available through the API.

REPLIGEN CORP · RGEN

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 10 of 10 purchase / sale groups and 30 of 57 other groups; the totals and the monthly series cover the whole window.

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{"action":"list","ticker":"RGEN","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.