Who owns REGENXBIO Inc. (RGNX)
Which tracked institutional funds hold RGNX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See RGNX company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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 RGNX is one-sided between 2025-Q4 and 2026-Q1: 19 added or opened and 68 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
RGNX’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes RGNX more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in RGNX 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 178 tracked filers holding RGNX, 95 increased or opened the position and 86 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 RGNX 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 10
- VANGUARD CAPITAL MANAGEMENT LLC$17M
- VANGUARD PORTFOLIO MANAGEMENT LLC$9M
- VANGUARD FIDUCIARY TRUST CO$3M
- Y-Intercept (Hong Kong) Ltd$2M
- Prosight Management, LP$2M
- Centiva Capital, LP$838K
Full exits 10
- VANGUARD GROUP INC$44M
- Trexquant Investment LP$4M
- MOORE CAPITAL MANAGEMENT, LP$3M
- ROYCE & ASSOCIATES LP$2M
- Propel Bio Management, LLC$2M
- AMERICAN CENTURY COMPANIES INC$2M
Largest adds
- EverSource Wealth Advisors, LLC$20M
- Qube Research & Technologies Ltd$5M
- TWO SIGMA INVESTMENTS, LP$3M
- D. E. Shaw & Co., Inc.$1M
- Russell Investments Group, Ltd.$811K
- Point72 Asset Management, L.P.$691K
Largest trims
- BlackRock, Inc.$34M
- Redmile Group, LLC$26M
- JPMORGAN CHASE & CO$24M
- MORGAN STANLEY$12M
- AQR CAPITAL MANAGEMENT LLC$11M
- GOLDMAN SACHS GROUP INC$10M
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 |
|---|---|---|---|---|
| BlackRock, Inc. added | 5,782,808 | $48M | 10.9% | 2026-Q1 |
| Redmile Group, LLC | 4,368,804 | $37M | 8.2% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 3,483,800 | $27M | 6.1% | 2026-Q1 |
| STATE STREET CORP added | 2,731,485 | $23M | 5.1% | 2026-Q1 |
| EverSource Wealth Advisors, LLC added | 79,634 | $20M | 4.5% | 2026-Q1 |
| MORGAN STANLEY added | 2,066,157 | $17M | 3.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,007,146 | $17M | 3.8% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,839,463 | $15M | 3.5% | 2026-Q1 |
| Integral Health Asset Management, LLC added | 1,500,000 | $13M | 2.8% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 1,310,493 | $11M | 2.5% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 1,137,498 | $10M | 2.1% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 1,026,432 | $9M | 1.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 1,018,901 | $9M | 1.9% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 1,010,381 | $8M | 1.9% | 2026-Q1 |
| Assenagon Asset Management S.A. trimmed | 980,611 | $8M | 1.8% | 2026-Q1 |
| Nuveen, LLC trimmed | 582,016 | $5M | 1.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 554,892 | $5M | 1.0% | 2026-Q1 |
| Pale Fire Capital SE trimmed | 493,726 | $4M | 0.9% | 2026-Q1 |
| 22NW, LP trimmed | 492,759 | $4M | 0.9% | 2026-Q1 |
| NORTHERN TRUST CORP added | 393,640 | $3M | 0.7% | 2026-Q1 |
| STIFEL FINANCIAL CORP added | 392,769 | $3M | 0.7% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 390,601 | $3M | 0.7% | 2026-Q1 |
| HRT FINANCIAL LP added | 351,489 | $3M | 0.7% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 324,860 | $3M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 312,064 | $3M | 0.6% | 2026-Q1 |
| FMR LLC added | 311,268 | $3M | 0.6% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 305,286 | $3M | 0.6% | 2026-Q1 |
| Voss Capital, LP added | 295,787 | $2M | 0.6% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 286,001 | $2M | 0.5% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 285,174 | $2M | 0.5% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd added | 275,021 | $2M | 0.5% | 2026-Q1 |
| GSK plc | 271,456 | $2M | 0.5% | 2026-Q1 |
| UBS Group AG added | 257,463 | $2M | 0.5% | 2026-Q1 |
| ArchPoint Investors | 222,278 | $2M | 0.4% | 2026-Q1 |
| Jump Financial, LLC added | 220,789 | $2M | 0.4% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 200,352 | $2M | 0.4% | 2026-Q1 |
| Prosight Management, LP new | 200,000 | $2M | 0.4% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 196,971 | $2M | 0.4% | 2026-Q1 |
| Man Group plc added | 187,625 | $2M | 0.4% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC added | 186,601 | $2M | 0.4% | 2026-Q1 |
| Hudson Bay Capital Management LP added | 180,000 | $2M | 0.3% | 2026-Q1 |
| Invesco Ltd. added | 158,829 | $1M | 0.3% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 149,000 | $1M | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 140,219 | $1M | 0.3% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 139,791 | $1M | 0.3% | 2026-Q1 |
| IEQ CAPITAL, LLC trimmed | 139,639 | $1M | 0.3% | 2026-Q1 |
| ExodusPoint Capital Management, LP added | 115,444 | $967K | 0.2% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 113,425 | $951K | 0.2% | 2026-Q1 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 112,011 | $939K | 0.2% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 64,730 | $932K | 0.2% | 2026-Q1 |
| Vestal Point Capital, LP added | 108,525 | $909K | 0.2% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 105,548 | $884K | 0.2% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC trimmed | 102,140 | $856K | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 101,245 | $848K | 0.2% | 2026-Q1 |
| Centiva Capital, LP new | 100,000 | $838K | 0.2% | 2026-Q1 |
| Jefferies Financial Group Inc. added | 95,400 | $799K | 0.2% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 91,084 | $763K | 0.2% | 2026-Q1 |
| Hennion & Walsh Asset Management, Inc. trimmed | 88,385 | $741K | 0.2% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 85,248 | $714K | 0.2% | 2026-Q1 |
| Rafferty Asset Management, LLC added | 73,878 | $619K | 0.1% | 2026-Q1 |
| CWM, LLC trimmed | 72,115 | $604K | 0.1% | 2026-Q1 |
| DekaBank Deutsche Girozentrale | 74,600 | $589K | 0.1% | 2026-Q1 |
| BARCLAYS PLC trimmed | 67,427 | $565K | 0.1% | 2026-Q1 |
| Birchview Capital, LP new | 66,270 | $555K | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP added | 63,700 | $534K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 60,487 | $507K | 0.1% | 2026-Q1 |
| Cerity Partners LLC trimmed | 58,377 | $489K | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 58,350 | $486K | 0.1% | 2026-Q1 |
| ACT CAPITAL MANAGEMENT, LLC trimmed | 56,000 | $469K | 0.1% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 55,830 | $467K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 51,129 | $429K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 50,502 | $423K | 0.1% | 2026-Q1 |
| HARBOR CAPITAL ADVISORS, INC. added | 48,492 | $406K | 0.1% | 2026-Q1 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC added | 44,460 | $379K | 0.1% | 2026-Q1 |
| ADAR1 Capital Management, LLC trimmed | 44,416 | $372K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 3,050,365 | $44M | 9.8% | 2025-Q4 stale |
| NORGES BANK trimmed | 220,524 | $5M | 1.0% | 2025-Q1 stale |
| Invenomic Capital Management LP new | 426,904 | $4M | 0.9% | 2025-Q3 stale |
| Trexquant Investment LP trimmed | 250,698 | $4M | 0.8% | 2025-Q4 stale |
| MOORE CAPITAL MANAGEMENT, LP added | 200,000 | $3M | 0.6% | 2025-Q4 stale |
| Aquilo Capital Management, LLC trimmed | 271,302 | $2M | 0.4% | 2025-Q1 stale |
| Avidity Partners Management LP trimmed | 260,000 | $2M | 0.4% | 2025-Q1 stale |
| Exome Asset Management LLC trimmed | 226,060 | $2M | 0.4% | 2025-Q2 stale |
| MARSHALL WACE, LLP trimmed | 222,342 | $2M | 0.4% | 2025-Q2 stale |
| ROYCE & ASSOCIATES LP trimmed | 119,038 | $2M | 0.4% | 2025-Q4 stale |
| Propel Bio Management, LLC new | 116,896 | $2M | 0.4% | 2025-Q4 stale |
| AMERICAN CENTURY COMPANIES INC trimmed | 113,134 | $2M | 0.4% | 2025-Q4 stale |
| MACQUARIE GROUP LTD | 149,000 | $1M | 0.3% | 2025-Q3 stale |
| Nebula Research & Development LLC new | 151,293 | $1M | 0.3% | 2025-Q2 stale |
| Campbell & CO Investment Adviser LLC added | 155,887 | $1M | 0.2% | 2025-Q1 stale |
| PDT Partners, LLC added | 102,516 | $733K | 0.2% | 2025-Q1 stale |
| TWO SIGMA ADVISERS, LP trimmed | 48,400 | $697K | 0.2% | 2025-Q4 stale |
| PRELUDE CAPITAL MANAGEMENT, LLC trimmed | 82,321 | $676K | 0.2% | 2025-Q2 stale |
| CITADEL ADVISORS LLC trimmed | 46,641 | $672K | 0.2% | 2025-Q4 stale |
| Simplify Asset Management Inc. new | 38,000 | $547K | 0.1% | 2025-Q4 stale |
| Janney Montgomery Scott LLC trimmed | 56,029 | $541K | 0.1% | 2025-Q3 stale |
| Cubist Systematic Strategies, LLC trimmed | 55,723 | $538K | 0.1% | 2025-Q3 stale |
| VICTORY CAPITAL MANAGEMENT INC added | 37,286 | $537K | 0.1% | 2025-Q4 stale |
| LPL Financial LLC trimmed | 32,705 | $471K | 0.1% | 2025-Q4 stale |
| LAZARD ASSET MANAGEMENT LLC added | 45,398 | $372K | 0.1% | 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.