Who owns RGEN (RGEN)
Which tracked institutional funds hold RGEN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See RGEN company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on RGEN is one-sided between 2025-Q4 and 2026-Q1: 57 added or opened and 204 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
RGEN’s largest tracked holder by dollar value, VANGUARD GROUP INC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp gap the other way — the median holder sizes RGEN more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in RGEN divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 441 tracked filers holding RGEN, 228 increased or opened the position and 235 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in RGEN between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 29
- VANGUARD CAPITAL MANAGEMENT LLC$282M
- VANGUARD PORTFOLIO MANAGEMENT LLC$272M
- MAVERICK CAPITAL LTD$179M
- WASATCH ADVISORS LP$147M
- VANGUARD FIDUCIARY TRUST CO$39M
- LMR Partners LLP$30M
Full exits 26
- VANGUARD GROUP INC$805M
- MARSHALL WACE, LLP$85M
- Walleye Capital LLC$68M
- Iron Triangle Partners LP$53M
- MOORE CAPITAL MANAGEMENT, LP$25M
- COMERICA BANK$24M
Largest adds
- T. Rowe Price Investment Management, Inc.$154M
- Vestal Point Capital, LP$95M
- GOLDMAN SACHS GROUP INC$28M
- AMERIPRISE FINANCIAL INC$28M
- FIRST TRUST ADVISORS LP$28M
- UBS Group AG$22M
Largest trims
- BlackRock, Inc.$518M
- PRICE T ROWE ASSOCIATES INC /MD/$179M
- FMR LLC$136M
- UNITED CAPITAL FINANCIAL ADVISORS, LLC$127M
- MILLENNIUM MANAGEMENT LLC$104M
- CITADEL ADVISORS LLC$99M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| PRICE T ROWE ASSOCIATES INC /MD/ added | 4,878,141 | $575M | 6.8% | 2026-Q1 |
| BlackRock, Inc. trimmed | 4,806,840 | $566M | 6.7% | 2026-Q1 |
| FMR LLC trimmed | 2,835,399 | $334M | 3.9% | 2026-Q1 |
| UNITED CAPITAL FINANCIAL ADVISORS, LLC added | 2,773,980 | $327M | 3.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,396,511 | $282M | 3.3% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 2,305,094 | $272M | 3.2% | 2026-Q1 |
| STATE STREET CORP added | 1,777,285 | $209M | 2.5% | 2026-Q1 |
| Bank of New York Mellon Corp added | 1,531,402 | $180M | 2.1% | 2026-Q1 |
| MAVERICK CAPITAL LTD added | 1,518,805 | $179M | 2.1% | 2026-Q1 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 1,397,515 | $165M | 1.9% | 2026-Q1 |
| T. Rowe Price Investment Management, Inc. added | 1,366,680 | $161M | 1.9% | 2026-Q1 |
| WASATCH ADVISORS LP new | 1,243,531 | $147M | 1.7% | 2026-Q1 |
| RTW INVESTMENTS, LP added | 1,206,000 | $142M | 1.7% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 1,193,139 | $141M | 1.7% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 831,792 | $136M | 1.6% | 2026-Q1 |
| Invesco Ltd. trimmed | 1,156,453 | $136M | 1.6% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 1,099,181 | $130M | 1.5% | 2026-Q1 |
| Conestoga Capital Advisors, LLC added | 1,097,783 | $129M | 1.5% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,064,457 | $125M | 1.5% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 925,214 | $109M | 1.3% | 2026-Q1 |
| Vestal Point Capital, LP added | 925,000 | $109M | 1.3% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 854,741 | $101M | 1.2% | 2026-Q1 |
| CONGRESS ASSET MANAGEMENT CO added | 797,867 | $94M | 1.1% | 2026-Q1 |
| Stephens Investment Management Group LLC added | 755,571 | $89M | 1.0% | 2026-Q1 |
| Holocene Advisors, LP trimmed | 708,889 | $84M | 1.0% | 2026-Q1 |
| Champlain Investment Partners, LLC trimmed | 693,855 | $82M | 1.0% | 2026-Q1 |
| GENEVA CAPITAL MANAGEMENT LLC added | 693,738 | $82M | 1.0% | 2026-Q1 |
| MORGAN STANLEY added | 683,789 | $81M | 0.9% | 2026-Q1 |
| UBS Group AG added | 670,329 | $79M | 0.9% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 651,347 | $77M | 0.9% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 630,070 | $74M | 0.9% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC added | 622,920 | $73M | 0.9% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 569,474 | $67M | 0.8% | 2026-Q1 |
| BAMCO INC /NY/ added | 548,346 | $65M | 0.8% | 2026-Q1 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 520,114 | $61M | 0.7% | 2026-Q1 |
| TimesSquare Capital Management, LLC added | 456,083 | $54M | 0.6% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 453,044 | $53M | 0.6% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 444,746 | $52M | 0.6% | 2026-Q1 |
| Impax Asset Management Group plc added | 438,468 | $52M | 0.6% | 2026-Q1 |
| FRED ALGER MANAGEMENT, LLC trimmed | 434,774 | $51M | 0.6% | 2026-Q1 |
| Thrivent Financial for Lutherans added | 425,389 | $50M | 0.6% | 2026-Q1 |
| Artemis Investment Management LLP added | 421,788 | $50M | 0.6% | 2026-Q1 |
| Blue Whale Capital LLP added | 404,200 | $48M | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 378,205 | $45M | 0.5% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 377,009 | $44M | 0.5% | 2026-Q1 |
| DF DENT & CO INC trimmed | 365,115 | $43M | 0.5% | 2026-Q1 |
| AMERICAN CAPITAL MANAGEMENT INC added | 357,720 | $42M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 330,767 | $39M | 0.5% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC trimmed | 280,523 | $33M | 0.4% | 2026-Q1 |
| PERCEPTIVE ADVISORS LLC trimmed | 280,541 | $33M | 0.4% | 2026-Q1 |
| SEI INVESTMENTS CO added | 272,103 | $32M | 0.4% | 2026-Q1 |
| RIVERBRIDGE PARTNERS LLC trimmed | 258,476 | $30M | 0.4% | 2026-Q1 |
| LMR Partners LLP added | 253,060 | $30M | 0.4% | 2026-Q1 |
| PALISADE CAPITAL MANAGEMENT, LP added | 240,619 | $28M | 0.3% | 2026-Q1 |
| Daiwa Securities Group Inc. added | 239,852 | $28M | 0.3% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 235,365 | $28M | 0.3% | 2026-Q1 |
| PRIMECAP MANAGEMENT CO/CA/ added | 235,068 | $28M | 0.3% | 2026-Q1 |
| NZS Capital, LLC added | 203,225 | $24M | 0.3% | 2026-Q1 |
| NORGES BANK trimmed | 185,205 | $24M | 0.3% | 2026-Q1 |
| BARCLAYS PLC added | 194,016 | $23M | 0.3% | 2026-Q1 |
| 12 West Capital Management LP trimmed | 191,233 | $23M | 0.3% | 2026-Q1 |
| Artisan Partners Limited Partnership trimmed | 190,100 | $22M | 0.3% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 181,380 | $21M | 0.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 177,517 | $21M | 0.2% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 176,328 | $21M | 0.2% | 2026-Q1 |
| Baird Financial Group, Inc. trimmed | 171,630 | $20M | 0.2% | 2026-Q1 |
| BROWN CAPITAL MANAGEMENT LLC trimmed | 169,996 | $20M | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 168,862 | $19M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 163,748 | $19M | 0.2% | 2026-Q1 |
| Ranger Investment Management, L.P. trimmed | 161,135 | $19M | 0.2% | 2026-Q1 |
| FIFTH THIRD BANCORP added | 161,070 | $19M | 0.2% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 159,745 | $19M | 0.2% | 2026-Q1 |
| SEGALL BRYANT & HAMILL, LLC added | 155,025 | $18M | 0.2% | 2026-Q1 |
| LOOMIS SAYLES & CO L P added | 152,585 | $18M | 0.2% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 149,903 | $18M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 136,329 | $16M | 0.2% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO | 134,571 | $16M | 0.2% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 127,964 | $15M | 0.2% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 125,469 | $15M | 0.2% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 128,221 | $14M | 0.2% | 2026-Q1 |
| JENNISON ASSOCIATES LLC trimmed | 121,239 | $14M | 0.2% | 2026-Q1 |
| Eversept Partners, LP added | 120,785 | $14M | 0.2% | 2026-Q1 |
| Curi Capital, LLC added | 118,654 | $14M | 0.2% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 4,914,144 | $805M | 9.5% | 2025-Q4 stale |
| SANDS CAPITAL MANAGEMENT, LLC trimmed | 1,251,088 | $156M | 1.8% | 2025-Q2 stale |
| MARSHALL WACE, LLP added | 516,336 | $85M | 1.0% | 2025-Q4 stale |
| Walleye Capital LLC added | 417,110 | $68M | 0.8% | 2025-Q4 stale |
| PointState Capital LP new | 409,503 | $55M | 0.6% | 2025-Q3 stale |
| Iron Triangle Partners LP added | 320,474 | $53M | 0.6% | 2025-Q4 stale |
| PARNASSUS INVESTMENTS, LLC trimmed | 254,621 | $32M | 0.4% | 2025-Q1 stale |
| MOORE CAPITAL MANAGEMENT, LP added | 150,000 | $25M | 0.3% | 2025-Q4 stale |
| COMERICA BANK added | 149,083 | $24M | 0.3% | 2025-Q4 stale |
| Squarepoint Ops LLC added | 175,248 | $23M | 0.3% | 2025-Q3 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 141,042 | $19M | 0.2% | 2025-Q3 stale |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 143,505 | $18M | 0.2% | 2025-Q2 stale |
| TUDOR INVESTMENT CORP ET AL | 129,522 | $17M | 0.2% | 2025-Q4 stale |
| Alyeska Investment Group, L.P. trimmed | 123,000 | $16M | 0.2% | 2025-Q3 stale |
| Point72 (DIFC) Ltd added | 109,658 | $15M | 0.2% | 2025-Q3 stale |
| RENAISSANCE TECHNOLOGIES LLC added | 109,404 | $15M | 0.2% | 2025-Q3 stale |
| HAWK RIDGE CAPITAL MANAGEMENT LP new | 115,400 | $14M | 0.2% | 2025-Q2 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.