REGENXBIO Inc. (RGNX) Ownership
RGNX ownership summary
as of October 17, 2026- Institutions
- 65.1% of shares outstanding
- Insiders
- 6.55% of shares outstanding
- Shares outstanding
- 66.0M
- Float
- 57.2M shares available to trade
- Short interest
- 15.41% 9.6M shares short
- Days to cover
- 7.07 short interest up 21.2% vs prior month
- Institutions 65.09%
- Insiders 6.55%
- Other investors 28.36%
RGNX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 9.74% | 6.4M | $44.3M | +614,632 (+10.6%) | June 30, 2026 |
| 2 | Redmile Group, LLC | 6.65% | 4.4M | $30.3M | — | June 30, 2026 |
| 3 | State Street Corp | 4.52% | 3.0M | $20.6M | +239,688 (+8.8%) | June 30, 2026 |
| 4 | JPMorgan Chase & Co | 3.37% | 2.2M | $15.3M | −1.3M (−36.4%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 3.21% | 2.1M | $14.6M | +100,411 (+5.0%) | June 30, 2026 |
| 6 | Morgan Stanley - Brokerage Accounts | 2.97% | 2.0M | $13.5M | −112,920 (−5.5%) | June 30, 2026 |
| 7 | The Goldman Sachs Group Inc | 2.16% | 1.4M | $9.8M | −418,010 (−22.7%) | June 30, 2026 |
| 8 | AQR Capital Management LLC | 2.10% | 1.4M | $9.5M | +326,646 (+31.1%) | June 30, 2026 |
| 9 | Vanguard Portfolio Management, LLC | 2.06% | 1.4M | $9.4M | +336,653 (+33.0%) | June 30, 2026 |
| 10 | Marshall Wace Asset Management Ltd | 1.96% | 1.3M | $8.9M | +1.3M (0.0%) | June 30, 2026 |
| 11 | Geode Capital Management, LLC | 1.89% | 1.2M | $8.6M | +103,798 (+9.1%) | June 30, 2026 |
| 12 | Integral Health Asset Management, LLC | 1.22% | 800K | $5.5M | −700,000 (−46.7%) | June 30, 2026 |
| 13 | Nuveen, LLC | 1.13% | 740K | $5.1M | +158,010 (+27.1%) | June 30, 2026 |
| 14 | Dimensional Fund Advisors, Inc. | 1.11% | 732K | $5.1M | −278,795 (−27.6%) | June 30, 2026 |
| 15 | D. E. Shaw & Co LP | 1.09% | 713K | $4.9M | +426,813 (+149.2%) | June 30, 2026 |
| 16 | Two Sigma Investments LLC | 1.02% | 670K | $4.6M | +114,916 (+20.7%) | June 30, 2026 |
| 17 | Citadel Advisors Llc | 1.02% | 669K | $4.6M | +669,023 (0.0%) | June 30, 2026 |
| 18 | Stifel Financial Corp | 0.85% | 561K | $3.9M | +167,958 (+42.8%) | June 30, 2026 |
| 19 | Bank of America Corp | 0.79% | 519K | $3.6M | +193,685 (+59.6%) | June 30, 2026 |
| 20 | 22NW, LP | 0.75% | 493K | $3.4M | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 4.7M shares and 5 cut 2.8M.
RGNX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | State Street® SPDR® S&P® Biotech ETF | 3.04% | 2.0M | $13.8M | −38,100 (−1.9%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.69% | 1.8M | $12.2M | — | August 31, 2026 |
| 3 | iShares Russell 2000 ETF | 2.32% | 1.5M | $10.6M | −17,600 (−1.1%) | September 30, 2026 |
| 4 | JPMorgan Small Cap Growth A | 1.93% | 1.3M | $8.8M | −37,333 (−2.9%) | August 31, 2026 |
| 5 | Nuveen Quant Small Cap Equity R6 | 1.30% | 855K | $5.9M | — | August 31, 2026 |
| 6 | BlackRock Advantage Small Cap Core Instl | 0.82% | 540K | $3.7M | +12,392 (+2.4%) | August 31, 2026 |
| 7 | Fidelity Small Cap Index | 0.80% | 528K | $3.7M | +4,666 (+0.9%) | July 31, 2026 |
| 8 | iShares Biotechnology ETF | 0.72% | 476K | $3.3M | −3,608 (−0.8%) | September 30, 2026 |
| 9 | iShares Russell 2000 Growth ETF | 0.70% | 461K | $3.2M | −584 (−0.1%) | September 30, 2026 |
| 10 | Vanguard Strategic Small-Cap Equity Inv | 0.65% | 427K | $3.0M | +48,771 (+12.9%) | June 30, 2026 |
| 11 | JPMorgan Small Cap Blend A | 0.62% | 406K | $2.8M | −7,455 (−1.8%) | August 31, 2026 |
| 12 | Fidelity Enhanced Small Cap Core ETF | 0.59% | 385K | $2.7M | +804 (+0.2%) | September 30, 2026 |
| 13 | Schwab US Small-Cap ETF™ | 0.49% | 323K | $2.2M | +216 (+0.1%) | September 30, 2026 |
| 14 | Lazard Baylight US Sm Cap Eq WW Dist EUR | 0.48% | 313K | $2.2M | +93,097 (+42.3%) | June 30, 2026 |
| 15 | JPM Thmtcs Gentc Thrps C2 dist USD | 0.44% | 289K | $2.0M | +3,246 (+1.1%) | August 31, 2026 |
| 16 | Vanguard Market Neutral I | 0.43% | 282K | $2.0M | +40,132 (+16.6%) | June 30, 2026 |
| 17 | Vanguard Russell 2000 ETF | 0.42% | 277K | $1.9M | +6,491 (+2.4%) | August 31, 2026 |
| 18 | Fidelity Extended Market Index | 0.37% | 242K | $1.7M | +2,987 (+1.2%) | August 31, 2026 |
| 19 | BlackRock Health Sciences Opps Inv A | 0.33% | 215K | $1.5M | — | August 31, 2026 |
| 20 | Vanguard Explorer Inv | 0.28% | 186K | $1.3M | +185,846 (0.0%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
RGNX insider transactions
latest 5| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-10 | Steve Pakola | Sell | $10.35 | 5,124 | $53,033 |
| 2025-10-09 | Curran Simpson | Sell | $12.62 | 20,811 | $262,635 |
| 2025-09-29 | Curran Simpson | Sell | $10.03 | 7,624 | $76,469 |
| 2025-09-10 | Curran Simpson | Sell | $10.02 | 7,734 | $77,495 |
| 2025-05-12 | Kenneth T Mills | Sell | $7.91 | 20,602 | $162,962 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
RGNX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns RGNX
Institutional investors own 65.1% of REGENXBIO's shares and insiders 6.55%. The largest holder is BlackRock Inc with 9.74% of the shares (6.4M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 5 reduced their stake in the latest filings. Short interest is 15.41% of the float, or 7.07 days of average trading volume. The share count rose 293.6% since 2014.
Related: RGNX analyst forecast, RGNX key metrics. See the RGNX stock overview for the latest quote and news.
RGNX ownership FAQ
Who owns the most REGENXBIO stock?
The largest shareholders of REGENXBIO are BlackRock Inc (9.74%), Redmile Group, LLC (6.65%), State Street Corp (4.52%), JPMorgan Chase & Co (3.37%), Vanguard Capital Management, LLC (3.21%).
What percentage of REGENXBIO is owned by institutions?
Institutions hold 65.1% of REGENXBIO's shares outstanding; insiders hold 6.55%.
Which funds own REGENXBIO?
The largest fund holders of REGENXBIO are State Street® SPDR® S&P® Biotech ETF (3.04%), Vanguard MStar Total Stk Mkt Idx Invest (2.69%), iShares Russell 2000 ETF (2.32%), JPMorgan Small Cap Growth A (1.93%), Nuveen Quant Small Cap Equity R6 (1.30%).
What is REGENXBIO's short interest?
9.6M shares of REGENXBIO were sold short, 15.41% of the float; at the average daily volume it would take 7.07 days to cover.
Are insiders buying or selling REGENXBIO?
Of the latest 5 reported insider transactions in REGENXBIO (since May 12, 2025), 0 were purchases and 5 were sales.
How many shares of REGENXBIO are outstanding?
REGENXBIO has 66.0M shares outstanding, of which 57.2M are in the public float.