Who owns Geron Corporation (GERN)
Which tracked institutional funds hold GERN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See GERN company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-22). 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
43 tracked funds added or opened GERN while 23 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
GERN’s largest tracked holder by dollar value, RA CAPITAL MANAGEMENT, L.P., sizes it at 1.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in GERN 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 255 tracked filers holding GERN, 129 increased or opened the position and 97 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 GERN 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 7
- VANGUARD CAPITAL MANAGEMENT LLC$40M
- Point72 Asset Management, L.P.$30M
- VANGUARD PORTFOLIO MANAGEMENT LLC$7M
- VANGUARD FIDUCIARY TRUST CO$6M
- MARSHALL WACE, LLP$4M
- J. Goldman & Co LP$910K
Full exits 12
- NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO$51M
- VANGUARD GROUP INC$41M
- Aberdeen Group plc$13M
- Woodline Partners LP$10M
- ALGERT GLOBAL LLC$5M
- Affinity Asset Advisors, LLC$2M
Largest adds
- Soleus Capital Management, L.P.$31M
- CITADEL ADVISORS LLC$19M
- RA CAPITAL MANAGEMENT, L.P.$11M
- Clearbridge Investments, LLC$10M
- STATE STREET CORP$10M
- BlackRock, Inc.$10M
Largest trims
- Vivo Capital, LLC$23M
- Vestal Point Capital, LP$11M
- GOLDMAN SACHS GROUP INC$5M
- Qube Research & Technologies Ltd$2M
- BARCLAYS PLC$2M
- TWO SIGMA INVESTMENTS, LP$883K
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 |
|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | 63,771,366 | $95M | 10.5% | 2026-Q1 |
| BlackRock, Inc. added | 47,319,779 | $71M | 7.8% | 2026-Q1 |
| Soleus Capital Management, L.P. added | 41,508,659 | $62M | 6.8% | 2026-Q1 |
| Deep Track Capital, LP trimmed | 31,720,278 | $47M | 5.2% | 2026-Q1 |
| STATE STREET CORP added | 30,497,183 | $45M | 5.0% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 26,669,029 | $40M | 4.4% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 21,576,569 | $32M | 3.6% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 20,457,134 | $30M | 3.4% | 2026-Q1 |
| Clearbridge Investments, LLC added | 19,620,320 | $29M | 3.2% | 2026-Q1 |
| Eversept Partners, LP added | 18,834,883 | $28M | 3.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 13,670,785 | $20M | 2.3% | 2026-Q1 |
| MORGAN STANLEY added | 12,665,119 | $19M | 2.1% | 2026-Q1 |
| Nantahala Capital Management, LLC added | 11,225,000 | $17M | 1.9% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 11,176,591 | $17M | 1.8% | 2026-Q1 |
| Vivo Capital, LLC trimmed | 8,671,797 | $13M | 1.4% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 7,321,522 | $11M | 1.2% | 2026-Q1 |
| Kynam Capital Management, LP added | 6,836,318 | $10M | 1.1% | 2026-Q1 |
| FMR LLC trimmed | 6,591,740 | $10M | 1.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 5,203,516 | $8M | 0.9% | 2026-Q1 |
| Pale Fire Capital SE added | 4,888,304 | $7M | 0.8% | 2026-Q1 |
| NORTHERN TRUST CORP added | 4,862,264 | $7M | 0.8% | 2026-Q1 |
| SEGALL BRYANT & HAMILL, LLC trimmed | 4,740,048 | $7M | 0.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 4,668,783 | $7M | 0.8% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 4,556,278 | $7M | 0.8% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 4,483,376 | $7M | 0.7% | 2026-Q1 |
| Candriam S.C.A. added | 3,921,476 | $6M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 3,835,146 | $6M | 0.6% | 2026-Q1 |
| UBS Group AG added | 3,693,333 | $6M | 0.6% | 2026-Q1 |
| MARSHALL WACE, LLP added | 2,960,047 | $4M | 0.5% | 2026-Q1 |
| Nuveen, LLC added | 2,931,489 | $4M | 0.5% | 2026-Q1 |
| Vestal Point Capital, LP trimmed | 2,540,000 | $4M | 0.4% | 2026-Q1 |
| EDMOND DE ROTHSCHILD HOLDING S.A. | 2,330,000 | $3M | 0.4% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 2,218,196 | $3M | 0.4% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 1,889,468 | $3M | 0.3% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 1,799,521 | $3M | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 1,540,236 | $2M | 0.3% | 2026-Q1 |
| Qube Research & Technologies Ltd trimmed | 1,445,859 | $2M | 0.2% | 2026-Q1 |
| NAN FUNG TRINITY (HK) LTD | 1,373,550 | $2M | 0.2% | 2026-Q1 |
| Invesco Ltd. added | 1,304,458 | $2M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 1,271,014 | $2M | 0.2% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 1,250,017 | $2M | 0.2% | 2026-Q1 |
| HRT FINANCIAL LP added | 1,214,752 | $2M | 0.2% | 2026-Q1 |
| World Investment Advisors | 1,033,779 | $2M | 0.2% | 2026-Q1 |
| XTX Topco Ltd added | 961,159 | $1M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 947,500 | $1M | 0.2% | 2026-Q1 |
| Rafferty Asset Management, LLC added | 883,595 | $1M | 0.1% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 771,971 | $1M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 737,143 | $1M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 700,101 | $1M | 0.1% | 2026-Q1 |
| EverSource Wealth Advisors, LLC added | 4,856 | $1M | 0.1% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 651,185 | $970K | 0.1% | 2026-Q1 |
| CITIGROUP INC added | 633,501 | $944K | 0.1% | 2026-Q1 |
| Virtus Investment Advisers, LLC added | 620,795 | $925K | 0.1% | 2026-Q1 |
| J. Goldman & Co LP added | 610,659 | $910K | 0.1% | 2026-Q1 |
| Lion Point Capital, LP | 578,000 | $861K | 0.1% | 2026-Q1 |
| ALPS ADVISORS INC trimmed | 521,439 | $777K | 0.1% | 2026-Q1 |
| Nvest Financial, LLC added | 508,474 | $758K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 555,701 | $734K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 460,729 | $686K | 0.1% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 426,698 | $636K | 0.1% | 2026-Q1 |
| Seven Fleet Capital Management LP trimmed | 424,180 | $632K | 0.1% | 2026-Q1 |
| Private Advisor Group, LLC added | 423,328 | $631K | 0.1% | 2026-Q1 |
| Man Group plc added | 396,908 | $591K | 0.1% | 2026-Q1 |
| Hennion & Walsh Asset Management, Inc. trimmed | 396,632 | $591K | 0.1% | 2026-Q1 |
| PROFUND ADVISORS LLC added | 394,909 | $588K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 390,016 | $582K | 0.1% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC new | 360,845 | $538K | 0.1% | 2026-Q1 |
| Inspire Investing, LLC trimmed | 349,627 | $521K | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 318,809 | $470K | 0.1% | 2026-Q1 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO added | 884,735 | $51M | 5.6% | 2025-Q4 stale |
| VANGUARD GROUP INC trimmed | 31,252,511 | $41M | 4.6% | 2025-Q4 stale |
| Logos Global Management LP added | 8,000,000 | $13M | 1.4% | 2025-Q1 stale |
| Aberdeen Group plc added | 9,527,083 | $13M | 1.4% | 2025-Q4 stale |
| Woodline Partners LP added | 7,504,094 | $10M | 1.1% | 2025-Q4 stale |
| STEMPOINT CAPITAL LP added | 6,649,244 | $9M | 1.0% | 2025-Q2 stale |
| ALGERT GLOBAL LLC trimmed | 3,499,747 | $5M | 0.5% | 2025-Q4 stale |
| Ally Bridge Group (NY) LLC added | 3,251,475 | $5M | 0.5% | 2025-Q2 stale |
| 683 Capital Management, LLC trimmed | 3,010,000 | $4M | 0.5% | 2025-Q3 stale |
| Exome Asset Management LLC trimmed | 1,858,354 | $3M | 0.3% | 2025-Q3 stale |
| Ikarian Capital, LLC added | 1,600,000 | $2M | 0.2% | 2025-Q2 stale |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 1,554,849 | $2M | 0.2% | 2025-Q2 stale |
| Nan Fung Group Holdings Ltd | 1,373,550 | $2M | 0.2% | 2025-Q1 stale |
| Affinity Asset Advisors, LLC | 1,500,000 | $2M | 0.2% | 2025-Q4 stale |
| Virtue Capital Management, LLC added | 36,302 | $2M | 0.2% | 2025-Q4 stale |
| Squarepoint Ops LLC trimmed | 1,130,076 | $1M | 0.2% | 2025-Q4 stale |
| Kodai Capital Management LP new | 893,091 | $1M | 0.2% | 2025-Q1 stale |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 822,700 | $1M | 0.1% | 2025-Q1 stale |
| Rhenman & Partners Asset Management AB trimmed | 783,000 | $1M | 0.1% | 2025-Q1 stale |
| Almitas Capital LLC trimmed | 896,323 | $1M | 0.1% | 2025-Q4 stale |
| Patient Square Capital LP added | 845,000 | $1M | 0.1% | 2025-Q3 stale |
| MML INVESTORS SERVICES, LLC added | 834,115 | $1M | 0.1% | 2025-Q4 stale |
| Stonepine Capital Management, LLC trimmed | 805,800 | $1M | 0.1% | 2025-Q4 stale |
| Centiva Capital, LP trimmed | 686,538 | $906K | 0.1% | 2025-Q4 stale |
| CANTOR FITZGERALD, L. P. added | 576,436 | $813K | 0.1% | 2025-Q2 stale |
| BOOTHBAY FUND MANAGEMENT, LLC added | 572,002 | $807K | 0.1% | 2025-Q2 stale |
| PRELUDE CAPITAL MANAGEMENT, LLC trimmed | 537,927 | $737K | 0.1% | 2025-Q3 stale |
| Summit X, LLC trimmed | 494,789 | $698K | 0.1% | 2025-Q2 stale |
| FIRST TRUST ADVISORS LP trimmed | 348,592 | $554K | 0.1% | 2025-Q1 stale |
| Empire Financial Management Company, LLC new | 370,000 | $507K | 0.1% | 2025-Q3 stale |
| TWO SIGMA ADVISERS, LP trimmed | 365,046 | $482K | 0.1% | 2025-Q4 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.