Cullinan Oncology LLC
Ownership
Ownership Structure
Who owns Cullinan Oncology LLC (CGEM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 78.2% of the shares are freely tradable; institutional investors hold 107.8%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| MPM Oncology Impact Management LP | 15.12 | 9,731,341 | +27.2 | 06/30/2026 |
| Lynx1 Capital Management, LP | 13.93 | 8,963,500 | +0.0 | 06/30/2026 |
| Bvf Inc | 8.94 | 5,750,683 | +0.0 | 03/31/2026 |
| BlackRock Inc | 6.91 | 4,449,966 | +1.1 | 03/31/2026 |
| Kynam Capital Management, LP | 4.84 | 3,114,132 | +0.0 | 06/30/2026 |
| State Street Corp | 3.95 | 2,544,115 | +15.8 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.86 | 2,483,034 | +0.0 | 03/31/2026 |
| T. Rowe Price Associates, Inc. | 3.15 | 2,029,719 | +4,201.4 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| State Street® SPDR® S&P® Biotech ETF | 3.90 | 2,509,230 | -1.1 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.04 | 1,954,696 | +1.3 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Michaelson Jennifer | Chief Scientific Officer | 158,844 | 3,351,608 $ | Sep 8, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 8, 2026 | Michaelson Jennifer | Chief Scientific Officer | Sell | 8,000 | 21.57 | 172,560 |
| Sep 8, 2026 | Michaelson Jennifer | Chief Scientific Officer | Other | 4,000 | 4.30 | 17,200 |
| Aug 13, 2026 | Michaelson Jennifer | Chief Scientific Officer | Sell | 30,000 | 20.26 | 607,800 |
| Aug 13, 2026 | Michaelson Jennifer | Chief Scientific Officer | Other | 30,000 | 4.30 | 129,000 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.