Geron Corporation (GERN) Ownership
GERN ownership summary
as of October 18, 2026- Institutions
- 77.1% of shares outstanding
- Insiders
- 0.08% of shares outstanding
- Shares outstanding
- 642.5M
- Float
- 556.3M shares available to trade
- Short interest
- 11.51% 73.9M shares short
- Days to cover
- 6.73 short interest down 10.6% vs prior month
- Institutions 77.11%
- Insiders 0.08%
- Other investors 22.81%
GERN top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 7.64% | 49.1M | $57.5M | +1.8M (+3.8%) | June 30, 2026 |
| 2 | RA Capital Management, LLC | 6.66% | 42.8M | $50.1M | −21.0M (−32.9%) | June 30, 2026 |
| 3 | Soleus Capital Management, L.P. | 6.66% | 42.8M | $50.1M | +1.3M (+3.1%) | June 30, 2026 |
| 4 | State Street Corp | 5.58% | 35.9M | $42.0M | +5.4M (+17.6%) | June 30, 2026 |
| 5 | Citadel Advisors Llc | 4.52% | 29.0M | $34.0M | +7.5M (+34.6%) | June 30, 2026 |
| 6 | Vanguard Capital Management, LLC | 4.24% | 27.3M | $31.9M | +581,186 (+2.2%) | June 30, 2026 |
| 7 | Nantahala Capital Management, LLC | 3.81% | 24.4M | $28.6M | +13.2M (+117.8%) | June 30, 2026 |
| 8 | ClearBridge Advisors, LLC | 3.06% | 19.6M | $23.0M | +28,533 (+0.1%) | June 30, 2026 |
| 9 | Eversept Partners, LP | 2.91% | 18.7M | $21.9M | −117,461 (−0.6%) | June 30, 2026 |
| 10 | The Goldman Sachs Group Inc | 2.59% | 16.6M | $19.5M | +5.5M (+48.8%) | June 30, 2026 |
| 11 | Geode Capital Management, LLC | 2.27% | 14.6M | $17.0M | +885,169 (+6.5%) | June 30, 2026 |
| 12 | Morgan Stanley - Brokerage Accounts | 2.01% | 12.9M | $15.1M | +280,312 (+2.2%) | June 30, 2026 |
| 13 | Vanguard Portfolio Management, LLC | 1.68% | 10.8M | $12.7M | +6.1M (+131.6%) | June 30, 2026 |
| 14 | Vivo Capital, LLC | 1.35% | 8.7M | $10.1M | — | June 30, 2026 |
| 15 | Millennium Management LLC | 1.26% | 8.1M | $9.5M | +790,745 (+10.8%) | June 30, 2026 |
| 16 | Kynam Capital Management, LP | 1.06% | 6.8M | $8.0M | — | June 30, 2026 |
| 17 | Candriam Luxembourg S.C.A. | 0.87% | 5.6M | $6.5M | +1.7M (+42.5%) | June 30, 2026 |
| 18 | FMR Inc | 0.86% | 5.5M | $6.4M | −1.1M (−16.6%) | June 30, 2026 |
| 19 | Pale Fire Capital SE | 0.83% | 5.3M | $6.2M | +418,900 (+8.6%) | June 30, 2026 |
| 20 | Northern Trust Corp | 0.78% | 5.0M | $5.9M | +169,948 (+3.5%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 15 holders added 45.6M shares and 3 cut 22.2M.
GERN top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.18% | 20.4M | $23.9M | — | August 31, 2026 |
| 2 | State Street® SPDR® S&P® Biotech ETF | 2.83% | 18.2M | $21.3M | −347,300 (−1.9%) | September 30, 2026 |
| 3 | iShares Russell 2000 ETF | 2.23% | 14.4M | $16.8M | −165,440 (−1.1%) | September 30, 2026 |
| 4 | Vanguard Explorer Inv | 2.02% | 13.0M | $15.2M | +2.8M (+27.6%) | June 30, 2026 |
| 5 | ClearBridge Small Cap Growth A | 0.98% | 6.3M | $7.4M | — | September 30, 2026 |
| 6 | Fidelity Small Cap Index | 0.95% | 6.1M | $7.1M | +21,771 (+0.4%) | July 31, 2026 |
| 7 | Fidelity Select Biotechnology | 0.85% | 5.5M | $6.4M | — | August 31, 2026 |
| 8 | iShares Russell 2000 Growth ETF | 0.82% | 5.3M | $6.2M | −6,690 (−0.1%) | September 30, 2026 |
| 9 | iShares Biotechnology ETF | 0.77% | 5.0M | $5.8M | −37,552 (−0.8%) | September 30, 2026 |
| 10 | Xtrackers MSCI World Swap ETF 1C | 0.73% | 4.7M | $5.5M | −29,360 (−0.6%) | December 31, 2025 |
| 11 | Belfius Equities Cure C Cap | 0.61% | 3.9M | $4.6M | +1.1M (+38.1%) | March 31, 2026 |
| 12 | Vanguard Russell 2000 ETF | 0.51% | 3.2M | $3.8M | +32,680 (+1.0%) | September 30, 2026 |
| 13 | Schwab US Small-Cap ETF™ | 0.48% | 3.1M | $3.6M | +2,079 (+0.1%) | September 30, 2026 |
| 14 | Fidelity Extended Market Index | 0.42% | 2.7M | $3.1M | −11,018 (−0.4%) | August 31, 2026 |
| 15 | Virtus LifeSci Biotech Products ETF | 0.23% | 1.5M | $1.7M | — | September 30, 2026 |
| 16 | Vanguard Health Care ETF | 0.23% | 1.5M | $1.7M | +1,595 (+0.1%) | September 30, 2026 |
| 17 | Schwab Small Cap Index | 0.21% | 1.4M | $1.6M | — | August 31, 2026 |
| 18 | ClearBridge Variable Small Cap Growth I | 0.21% | 1.3M | $1.6M | — | September 30, 2026 |
| 19 | EdRF Healthcare A EUR | 0.19% | 1.2M | $1.4M | −520,175 (−30.2%) | August 31, 2026 |
| 20 | Vanguard VIF Small Co Gr | 0.17% | 1.1M | $1.3M | +1.1M (0.0%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
GERN insider transactions
latest 8| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-02-27 | John A Scarlett | Buy | $1.76 | 12,500 | $22,000 |
| 2025-02-27 | Scott Alan Samuels | Buy | $1.61 | 15,000 | $24,150 |
| 2024-07-08 | Andrew J. Grethlein | Sell | $4.56 | 674,348 | $3.1M |
| 2024-06-10 | Faye Feller | Sell | $4.63 | 287,900 | $1.3M |
| 2024-06-04 | John A Scarlett | Sell | $4.00 | 600,000 | $2.4M |
| 2023-08-24 | Elizabeth G O'farrell | Buy | $2.28 | 6,607 | $15,064 |
| 2023-05-11 | V Bryan Lawlis | Sell | $3.00 | 35,000 | $105,000 |
| 2023-05-01 | Susan Molineaux | Sell | $2.48 | 35,000 | $86,800 |
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.
GERN shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns GERN
Institutional investors own 77.1% of Geron's shares and insiders 0.08%. The largest holder is BlackRock Inc with 7.64% of the shares (49.1M), as of June 30, 2026. Among the top 20 institutions, 15 added shares and 3 reduced their stake in the latest filings. Short interest is 11.51% of the float, or 6.73 days of average trading volume. The share count rose 324.6% since 2014.
Related: GERN analyst forecast, GERN key metrics. See the GERN stock overview for the latest quote and news.
GERN ownership FAQ
Who owns the most Geron stock?
The largest shareholders of Geron are BlackRock Inc (7.64%), RA Capital Management, LLC (6.66%), Soleus Capital Management, L.P. (6.66%), State Street Corp (5.58%), Citadel Advisors Llc (4.52%).
What percentage of Geron is owned by institutions?
Institutions hold 77.1% of Geron's shares outstanding; insiders hold 0.08%.
Which funds own Geron?
The largest fund holders of Geron are Vanguard MStar Total Stk Mkt Idx Invest (3.18%), State Street® SPDR® S&P® Biotech ETF (2.83%), iShares Russell 2000 ETF (2.23%), Vanguard Explorer Inv (2.02%), ClearBridge Small Cap Growth A (0.98%).
What is Geron's short interest?
73.9M shares of Geron were sold short, 11.51% of the float; at the average daily volume it would take 6.73 days to cover.
Are insiders buying or selling Geron?
Of the latest 8 reported insider transactions in Geron (since May 1, 2023), 3 were purchases and 5 were sales.
How many shares of Geron are outstanding?
Geron has 642.5M shares outstanding, of which 556.3M are in the public float.