As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Geron Corporation. The largest reported stake is RA Capital Management, L.P.'s, at 9.9%. 8 filings are on record since August 14, 2025 (Schedule 13G/A, August 14, 2026).
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Key facts
- · Reporting person: RA Capital Management, L.P. · Sole voting: 0 · Shared voting: 66,502,728 · Sole dispositive: 0 · Shared dispositive: 66,502,728 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: State Street Corporation · Sole voting: 0 · Shared voting: 34,097,965 · Sole dispositive: 0 · Shared dispositive: 35,856,671 · SCHEDULE 13G, 2026-08-07
- · Reporting person: Deep Track Capital, LP · Sole voting: 0 · Shared voting: 31,720,278 · Sole dispositive: 0 · Shared dispositive: 31,720,278 · SCHEDULE 13G/A, 2026-05-15
- · Reporting person: Soleus Capital Master Fund, L.P. · Sole voting: 0 · Shared voting: 41,508,659 · Sole dispositive: 0 · Shared dispositive: 41,508,659 · SCHEDULE 13G/A, 2026-05-08
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
Geron Corporation has 8 Schedule 13D or 13G filings on record since 2025-08-14. 3 holders' latest filing reports 5% or more of common stock, $0.001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Layoffs on record: about 260 jobs, latest 2025-12-16 (layoff filings and notices).
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| RA Capital Management, L.P. | 9.9% | 66,502,728 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Soleus Capital Master Fund, L.P. | 6.5% | 41,508,659 | SCHEDULE 13G/A, 2026-05-08 | 2026-03-31 |
| State Street Corporation | 5.6% | 35,856,671 | SCHEDULE 13G, 2026-08-07 | 2026-06-30 |
| Deep Track Capital, LP | 4.95% | 31,720,278 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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Keep reading
More on Geron Corporation and the records around it.
Geron Corporation elsewhere on the record
- Layoff notices Dec 2025
- Who owns it
Companies that share a holder
- Soleus Capital Master Fund, L.P. also filed stake reports on 24 other companies: Beta Bionics, Inc. (Nov 2026), Evolus, Inc (Nov 2026), INSPIRE MEDICAL SYSTEMS, INC. (Nov 2026)
- Deep Track Capital, LP also filed stake reports on 59 other companies: Alector, Inc. (Oct 2026), TCGX Acquisition Corp. II (Oct 2026), Frazier Life Sciences Acquisition Corp. II (Oct 2026)
- RA Capital Management, L.P. also filed stake reports on 100 other companies: Climb Bio, Inc. (Nov 2026), Bambusa Therapeutics, Inc. (Nov 2026), SOLID BIOSCIENCES INC. (Nov 2026)
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What the Full Report on Geron Corporation covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| RA Capital Management, L.P. | 0 | 66,502,728 | 0 | 66,502,728 | SCHEDULE 13G/A, 2026-08-14 |
| Peter Kolchinsky | 0 | 66,502,728 | 0 | 66,502,728 | SCHEDULE 13G/A, 2026-08-14 |
| Rajeev Shah | 0 | 66,502,728 | 0 | 66,502,728 | SCHEDULE 13G/A, 2026-08-14 |
| RA Capital Healthcare Fund, L.P. | 0 | 66,502,728 | 0 | 66,502,728 | SCHEDULE 13G/A, 2026-08-14 |
| Soleus Capital Master Fund, L.P. | 0 | 41,508,659 | 0 | 41,508,659 | SCHEDULE 13G/A, 2026-05-08 |
| Soleus Capital, LLC | 0 | 41,508,659 | 0 | 41,508,659 | SCHEDULE 13G/A, 2026-05-08 |
| Soleus Capital Group, LLC | 0 | 41,508,659 | 0 | 41,508,659 | SCHEDULE 13G/A, 2026-05-08 |
| Soleus Capital Management, L.P. | 0 | 41,508,659 | 0 | 41,508,659 | SCHEDULE 13G/A, 2026-05-08 |
| Soleus GP, LLC | 0 | 41,508,659 | 0 | 41,508,659 | SCHEDULE 13G/A, 2026-05-08 |
| Guy Levy | 0 | 41,508,659 | 0 | 41,508,659 | SCHEDULE 13G/A, 2026-05-08 |
| State Street Corporation | 0 | 34,097,965 | 0 | 35,856,671 | SCHEDULE 13G, 2026-08-07 |
| Deep Track Capital, LP | 0 | 31,720,278 | 0 | 31,720,278 | SCHEDULE 13G/A, 2026-05-15 |
| Deep Track Biotechnology Master Fund, Ltd. | 0 | 31,720,278 | 0 | 31,720,278 | SCHEDULE 13G/A, 2026-05-15 |
| David Kroin | 0 | 31,720,278 | 0 | 31,720,278 | SCHEDULE 13G/A, 2026-05-15 |
The latest filing identifies Geron Corporation by CUSIP 374163103 and gives its principal executive office as 919 East Hillsdale Boulevard, Suite 250, Foster City, CA 94404 (SCHEDULE 13G/A, 2026-08-14).
What the percentages are based on
Due to the Beneficial Ownership Blocker listed in the Pre-Funded Warrants, each Reporting Person's beneficial ownership percentage was 9.99% as of June 30, 2026.RA Capital Management, L.P., SCHEDULE 13G/A, 2026-08-14
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-14 | Deep Track Capital, LP | 6.75% | SCHEDULE 13G/A |
| 2026-02-13 | Deep Track Capital, LP | 5.09% | SCHEDULE 13G/A |
| 2026-03-03 | Soleus Capital Master Fund, L.P. | 5.2% | SCHEDULE 13G |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-05-08 | Soleus Capital Master Fund, L.P. | 6.5% | SCHEDULE 13G/A |
| 2026-05-15 | Deep Track Capital, LP | 4.95% | SCHEDULE 13G/A |
| 2026-08-07 | State Street Corporation | 5.6% | SCHEDULE 13G |
| 2026-08-14 | RA Capital Management, L.P. | 9.9% | SCHEDULE 13G/A |
Questions about who owns Geron Corporation
Who owns Geron Corporation?
On this page, 3 holders' latest ownership filings report 5% or more of Geron Corporation: RA Capital Management, L.P. (9.9%, Schedule 13G/A, filed 2026-08-14), Soleus Capital Master Fund, L.P. (6.5%, Schedule 13G/A, filed 2026-05-08) and State Street Corporation (5.6%, Schedule 13G, filed 2026-08-07).
Who are the largest shareholders of Geron Corporation?
By the share each holder's latest filing reports, the largest holders of Geron Corporation on this page are RA Capital Management, L.P. (9.9%), Soleus Capital Master Fund, L.P. (6.5%) and State Street Corporation (5.6%).
When did RA Capital Management, L.P. buy into Geron Corporation?
The filings give report dates, not purchase dates. The earliest filing from RA Capital Management, L.P. on this page is the Schedule 13G/A, filed 2026-08-14, reporting 9.9%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.