Comparable stake leader
RA CAPITAL MANAGEMENT, L.P.
SEC ownership of GERON CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000886744.
Disclosed value leader
RA CAPITAL MANAGEMENT, L.P.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- GERN on Nasdaq
- Parsed ownership sources
-
13F and 13D/G
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
RA CAPITAL MANAGEMENT, L.P.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
RA CAPITAL MANAGEMENT, L.P.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000886744
- Issuer location
- Foster City, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of GERON CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
RA CAPITAL MANAGEMENT, L.P.
Disclosed value leader
RA CAPITAL MANAGEMENT, L.P.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13F
13D/G
Lead comparable stake: 9.9%
13D/G row: RA CAPITAL MANAGEMENT, L.P.
Showing 1-8 of 50 holder rows.
Quick read
RA CAPITAL MANAGEMENT, L.P. leads the comparable SEC ownership view at 9.9%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens RA CAPITAL MANAGEMENT, L.P.'s linked filing trail.
Comparable ownership
Top 5
RA CAPITAL MANAGEMENT, L.P.
9.9%
Soleus Capital Master Fund, L.P.
6.5%
Deep Track Capital, LP
5%
BlackRock, Inc.
7.4%
Soleus Capital Management, L.P.
6.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. |
13F
13D/G
Company
|
9.9%
from 13D/G
|
$95,019,335
63,771,366 shares
|
— | 31 Mar 2026 |
| Soleus Capital Master Fund, L.P. |
13D/G
|
6.5%
|
$72,640,153
41,508,659 shares
|
+$14,875,000 | 31 Mar 2026 |
| Deep Track Capital, LP |
13D/G
13F
Company
|
5%
|
$55,510,486
31,720,278 shares
|
-$1,384,238 | 31 Mar 2026 |
| BlackRock, Inc. |
13F
Company
|
7.4%
|
$70,506,471
47,319,779 shares
|
— | 31 Mar 2026 |
| Soleus Capital Management, L.P. |
13F
Company
|
6.5%
|
$61,847,902
41,508,659 shares
|
— | 31 Mar 2026 |
| STATE STREET CORP |
13F
Company
|
4.8%
|
$45,440,803
30,497,183 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
4.2%
|
$39,736,853
26,669,029 shares
|
— | 31 Mar 2026 |
| CITADEL ADVISORS LLC |
13F
Company
|
3.4%
|
$32,149,088
21,576,569 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$19,119.
Buys
$0
Insiders: 0
Sells
$19,119
Insiders: 1
Net
-$19,119
Shares: -9,855
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 9,855
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 9,855 | $0 | $19,119 | -$19,119 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 24 reporting-owner rows connected to GERON CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
24
Largest Forms 3/4/5 holder
John A. Scarlett
Net 12M change
-$19,119
Latest report
20 May 2026
Recent insider transactions for GERON CORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Robert J. Spiegel | GERN | Stock Option (right to buy) | Award | 220,000 | 220,000 | 20 May 2026 | Direct | |||
| Elizabeth G. O'Farrell | GERN | Stock Option (right to buy) | Award | 220,000 | 220,000 | 20 May 2026 | Direct | |||
| Susan Molineaux | GERN | Stock Option (right to buy) | Award | 220,000 | 220,000 | 20 May 2026 | Direct | |||
| John F. McDonald | GERN | Stock Option (right to buy) | Award | 220,000 | 220,000 | 20 May 2026 | Direct | |||
| Dawn Carter Bir | GERN | Stock Option (right to buy) | Award | 220,000 | 220,000 | 20 May 2026 | Direct | |||
| Timothy Williams | GERN | Stock Option (Right to Buy) | Award | 2,500,000 | 2,500,000 | 13 Apr 2026 | Direct | |||
| Robert J. Spiegel | GERN | Common Stock | Award | 2.7% | 5,243 | 199,707 | 31 Mar 2026 | Direct | ||
| Constantine Chinoporos | GERN | Stock Option (Right to Buy) | Award | 270,000 | 270,000 | 25 Mar 2026 | Direct | |||
| Patricia S. Andrews | GERN | Stock Option (Right to Buy) | Award | 270,000 | 270,000 | 25 Mar 2026 | Direct | |||
| Michelle Robertson | GERN | Common Stock | Sale | -35.8% | $19,119 | $1.94 | -9,855 | 17,645 | 18 Feb 2026 | Direct |
| Michelle Robertson | GERN | Common Stock | Options Exercise | 27,500 | 27,500 | 18 Feb 2026 | Direct | |||
| Michelle Robertson | GERN | Restricted Stock Units | Options Exercise | -25% | -27,500 | 82,500 | 18 Feb 2026 | Direct | ||
| Joseph Eid | GERN | Stock Option (Right to Buy) | Award | 2,220,000 | 2,220,000 | 17 Feb 2026 | Direct | |||
| Michelle Robertson | GERN | Stock Option (Right to Buy) | Award | 1,660,000 | 1,660,000 | 17 Feb 2026 | Direct | |||
| Robert J. Spiegel | GERN | Common Stock | Award | 3.14% | 5,918 | 194,464 | 31 Dec 2025 | Direct | ||
| Ahmed ElNawawi | GERN | Stock Option (right to buy) | Award | 3,000,000 | 3,000,000 | 20 Oct 2025 | Direct | |||
| Robert J. Spiegel | GERN | Common Stock | Award | 3.12% | 5,702 | 188,546 | 30 Sep 2025 | Direct | ||
| Harout Semerjian | GERN | Stock Option (right to buy) | Award | 11,000,000 | 7,000,000 | 07 Aug 2025 | Direct | |||
| Robert J. Spiegel | GERN | Common Stock | Award | 3.12% | 5,540 | 182,844 | 30 Jun 2025 | Direct |
* marks a reported price that did not pass the local price check.