Company · Ownership research

REPLIGEN CORP RGEN

CIK 0000730272 · CUSIP 759916109

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 759916109 (RGEN), not CUSIP 759916909 (RGEN), CUSIP 759916959 (RGEN), and does not merge CUSIPs.

This page lists the top 20 of 220 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC CIK 1644956 · View history	$239.02M 1,243,415 shares	0.78%	+454.84K(+57.70%)Added	SEC filing ↗ Nov 6, 2026	▾
02	Bank of New York Mellon Corp CIK 1390777 · View history	$208.95M 1,086,970 shares	0.03%	-435.89K(-28.60%)Reduced	SEC filing ↗ Nov 5, 2026	▾
03	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$208.89M 1,086,384 shares	0.01%	+23.91K(+2.30%)Added	SEC filing ↗ Nov 6, 2026	▾
04	CONGRESS ASSET MANAGEMENT CO CIK 897378 · View history	$196.25M 1,020,907 shares	1.27%	+8.68K(+0.90%)Added	SEC filing ↗ Oct 6, 2026	▾
05	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$180.35M 938,169 shares	0.03%	-11.69K(-1.20%)Reduced	SEC filing ↗ Nov 4, 2026	▾
06	WASATCH ADVISORS LP CIK 814133 · View history	$174.38M 907,159 shares	1.29%	-683.09K(-43.00%)Reduced	SEC filing ↗ Oct 13, 2026	▾
07	Conestoga Capital Advisors, LLC CIK 1163744 · View history	$134.68M 700,626 shares	4.07%	-280.36K(-28.60%)Reduced	SEC filing ↗ Nov 2, 2026	▾
08	Thrivent Financial for Lutherans CIK 314984 · View history	$83.06M 432,106 shares	0.14%	-4.76K(-1.10%)Reduced	SEC filing ↗ Nov 5, 2026	▾
09	TimesSquare Capital Management, LLC CIK 1313816 · View history	$76.39M 397,389 shares	1.25%	-49.58K(-11.10%)Reduced	SEC filing ↗ Nov 3, 2026	▾
10	Artemis Investment Management LLP CIK 1535385 · View history	$71.99M 374,482 shares	0.63%	+252.75K(+207.60%)Added	SEC filing ↗ Oct 8, 2026	▾
11	BARCLAYS PLC CIK 312069 · View history	$68.51M 356,419 shares	0.02%	+200.67K(+128.80%)Added	SEC filing ↗ Nov 6, 2026	▾
12	RIVERBRIDGE PARTNERS LLC CIK 1112325 · View history	$31.92M 166,046 shares	0.94%	-6.46K(-3.70%)Reduced	SEC filing ↗ Nov 5, 2026	▾
13	Daiwa Securities Group Inc. CIK 1481045 · View history	$30.33M 157,773 shares	0.07%	-108.20K(-40.70%)Reduced	SEC filing ↗ Oct 29, 2026	▾
14	Allspring Global Investments Holdings, LLC CIK 1890906 · View history	$27.33M 154,190 shares	0.04%	+1.08K(+0.70%)Added	SEC filing ↗ Nov 4, 2026	▾
15	FIFTH THIRD BANCORP CIK 35527 · View history	$26.74M 139,119 shares	0.04%	-18.30K(-11.60%)Reduced	SEC filing ↗ Nov 5, 2026	▾
16	PRINCIPAL FINANCIAL GROUP INC CIK 1126328 · View history	$24.90M 129,556 shares	0.01%	+9.17K(+7.60%)Added	SEC filing ↗ Nov 2, 2026	▾
17	BROWN CAPITAL MANAGEMENT LLC CIK 885062 · View history	$16.25M 84,554 shares	3.08%	-56.34K(-40.00%)Reduced	SEC filing ↗ Oct 27, 2026	▾
18	Aberdeen Group plc CIK 1716774 · View history	$15.62M 70,638 shares	0.02%	+22.23K(+45.90%)Added	SEC filing ↗ Nov 6, 2026	▾
19	Covea Finance CIK 1636948 · View history	$15.05M 78,300 shares	0.49%	+50.30K(+179.60%)Added	SEC filing ↗ Oct 21, 2026	▾
20	STRS OHIO CIK 820478 · View history	$11.80M 61,381 shares	0.04%	+5.36K(+9.60%)Added	SEC filing ↗ Oct 30, 2026	▾

Showing 20 / 220 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

220

Cancelled or null records excluded

Disclosed shares

10,639,977

Not deduplicated across managers

Disclosed value

$2.04B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

REPLIGEN CORP · Q3 2026

Explore all 220 reporting institutions.

This page includes 20 of 220 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

Download CSV
Earlier quarters
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

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. This page lists 20 of 220 reporting institutions; totals use the complete disclosed data.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_institutional_holdings
{"action":"holders","cusip":"759916109","quarter":"2026Q3","type":"positions","page_size":100}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

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.