Who owns Cullinan Therapeutics (CGEM)
Which tracked institutional funds hold CGEM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CGEM company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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
The tracked-fund tape on CGEM is one-sided between 2026-Q1 and 2026-Q2: 78 added or opened and 19 trimmed or exited — on balance accumulating.
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
CGEM’s largest tracked holder by dollar value, MPM BIOIMPACT LLC, sizes it at 10.8% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 10.8pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CGEM 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 2026-Q1 and 2026-Q2, across 178 tracked filers holding CGEM, 111 increased or opened the position and 71 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 CGEM between the 2026-Q1 and 2026-Q2 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 10
- BOONE CAPITAL MANAGEMENT LLC$13M
- PERCEPTIVE ADVISORS LLC$8M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$4M
- Squarepoint Ops LLC$3M
- MARTINGALE ASSET MANAGEMENT L P$1M
- FRANKLIN RESOURCES INC$771K
Full exits 9
- Nextech Invest, Ltd.$16M
- DEERFIELD MANAGEMENT COMPANY, L.P.$5M
- ORBIMED ADVISORS LLC$3M
- SCHRODER INVESTMENT MANAGEMENT GROUP$2M
- Cinctive Capital Management LP$1M
- SUPERSTRING CAPITAL MANAGEMENT LP$845K
Largest adds
- MPM BIOIMPACT LLC$69M
- PRICE T ROWE ASSOCIATES INC /MD/$41M
- Lynx1 Capital Management LP$36M
- BlackRock, Inc.$32M
- STATE STREET CORP$31M
- BVF INC/IL$23M
Largest trims
- MARSHALL WACE, LLP$14M
- Point72 Asset Management, L.P.$11M
- Soleus Capital Management, L.P.$5M
- Nuveen, LLC$3M
- TWO SIGMA INVESTMENTS, LP$2M
- Longaeva Partners L.P.$1M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| MPM BIOIMPACT LLC added | 9,731,341 | $177M | 13.7% | 2026-Q2 |
| Lynx1 Capital Management LP | 8,963,500 | $163M | 12.6% | 2026-Q2 |
| BVF INC/IL | 5,750,683 | $105M | 8.1% | 2026-Q2 |
| BlackRock, Inc. added | 5,232,766 | $95M | 7.4% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 3,825,950 | $70M | 5.4% | 2026-Q2 |
| STATE STREET CORP added | 3,668,627 | $67M | 5.2% | 2026-Q2 |
| Kynam Capital Management, LP | 3,114,132 | $57M | 4.4% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 2,614,066 | $48M | 3.7% | 2026-Q2 |
| RTW INVESTMENTS, LP added | 2,364,347 | $43M | 3.3% | 2026-Q2 |
| Siren, L.L.C. added | 1,893,410 | $34M | 2.7% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,547,309 | $28M | 2.2% | 2026-Q2 |
| Blue Owl Capital Holdings LP trimmed | 1,539,764 | $28M | 2.2% | 2026-Q2 |
| Venrock Adviser, LLC | 1,379,965 | $25M | 1.9% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 1,082,611 | $20M | 1.5% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,046,694 | $19M | 1.5% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,001,598 | $18M | 1.4% | 2026-Q2 |
| Affinity Asset Advisors, LLC added | 875,760 | $16M | 1.2% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 738,741 | $13M | 1.0% | 2026-Q2 |
| BOONE CAPITAL MANAGEMENT LLC new | 704,442 | $13M | 1.0% | 2026-Q2 |
| Elmind Capital, LP added | 690,000 | $13M | 1.0% | 2026-Q2 |
| MORGAN STANLEY added | 629,035 | $11M | 0.9% | 2026-Q2 |
| TWIN FOCUS CAPITAL PARTNERS, LLC | 595,489 | $11M | 0.8% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 581,338 | $11M | 0.8% | 2026-Q2 |
| NORTHERN TRUST CORP added | 571,080 | $10M | 0.8% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 510,325 | $9M | 0.7% | 2026-Q2 |
| Nuveen, LLC trimmed | 471,947 | $9M | 0.7% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 464,034 | $8M | 0.7% | 2026-Q2 |
| PERCEPTIVE ADVISORS LLC added | 426,478 | $8M | 0.6% | 2026-Q2 |
| TCG Crossover Management, LLC | 406,786 | $7M | 0.6% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 397,484 | $7M | 0.6% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 382,840 | $7M | 0.5% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 363,136 | $7M | 0.5% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 346,232 | $6M | 0.5% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 326,811 | $6M | 0.5% | 2026-Q2 |
| GREAT POINT PARTNERS LLC | 300,000 | $5M | 0.4% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 292,500 | $5M | 0.4% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 282,631 | $5M | 0.4% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 272,581 | $5M | 0.4% | 2026-Q2 |
| Bleichroeder LP added | 250,000 | $5M | 0.4% | 2026-Q2 |
| UBS Group AG added | 248,627 | $5M | 0.3% | 2026-Q2 |
| FMR LLC added | 240,115 | $4M | 0.3% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 238,000 | $4M | 0.3% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC | 233,842 | $4M | 0.3% | 2026-Q2 |
| PFM Health Sciences, LP trimmed | 192,442 | $4M | 0.3% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP added | 189,946 | $3M | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp added | 171,031 | $3M | 0.2% | 2026-Q2 |
| Squarepoint Ops LLC added | 168,117 | $3M | 0.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 167,555 | $3M | 0.2% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 164,716 | $3M | 0.2% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 156,317 | $3M | 0.2% | 2026-Q2 |
| Engineers Gate Manager LP added | 153,050 | $3M | 0.2% | 2026-Q2 |
| Trexquant Investment LP trimmed | 152,163 | $3M | 0.2% | 2026-Q2 |
| BARCLAYS PLC added | 143,945 | $3M | 0.2% | 2026-Q2 |
| Invesco Ltd. trimmed | 143,552 | $3M | 0.2% | 2026-Q2 |
| Jump Financial, LLC trimmed | 138,708 | $3M | 0.2% | 2026-Q2 |
| CITIGROUP INC trimmed | 124,409 | $2M | 0.2% | 2026-Q2 |
| Quantinno Capital Management LP added | 109,876 | $2M | 0.2% | 2026-Q2 |
| Creative Planning added | 86,458 | $2M | 0.1% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 84,178 | $2M | 0.1% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd trimmed | 80,648 | $1M | 0.1% | 2026-Q2 |
| TD Asset Management Inc trimmed | 80,628 | $1M | 0.1% | 2026-Q2 |
| Apis Capital Advisors, LLC added | 80,000 | $1M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 78,930 | $1M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 76,965 | $1M | 0.1% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 76,711 | $1M | 0.1% | 2026-Q2 |
| Swiss National Bank added | 76,000 | $1M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 75,250 | $1M | 0.1% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 75,009 | $1M | 0.1% | 2026-Q2 |
| Mariner, LLC added | 74,273 | $1M | 0.1% | 2026-Q2 |
| Knott David M Jr added | 69,182 | $1M | 0.1% | 2026-Q2 |
| Rafferty Asset Management, LLC trimmed | 66,092 | $1M | 0.1% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 66,051 | $1M | 0.1% | 2026-Q2 |
| Longaeva Partners L.P. trimmed | 64,785 | $1M | 0.1% | 2026-Q2 |
| Tidal Investments LLC added | 62,826 | $1M | 0.1% | 2026-Q2 |
| Tema ETFs LLC added | 62,826 | $1M | 0.1% | 2026-Q2 |
| MARTINGALE ASSET MANAGEMENT L P added | 61,938 | $1M | 0.1% | 2026-Q2 |
| Assenagon Asset Management S.A. trimmed | 61,682 | $1M | 0.1% | 2026-Q2 |
| Corient Private Wealth LP added | 53,282 | $970K | 0.1% | 2026-Q2 |
| KENNEDY CAPITAL MANAGEMENT LLC added | 53,010 | $965K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 51,256 | $933K | 0.1% | 2026-Q2 |
| Soleus Capital Management, L.P. trimmed | 50,000 | $910K | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 42,345 | $771K | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 40,253 | $733K | 0.1% | 2026-Q2 |
| ALGERT GLOBAL LLC trimmed | 36,851 | $671K | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 36,777 | $670K | 0.1% | 2026-Q2 |
| Fisher Asset Management, LLC new | 35,998 | $656K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 35,746 | $651K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 35,535 | $649K | 0.1% | 2026-Q2 |
| IEQ CAPITAL, LLC added | 33,720 | $614K | 0.0% | 2026-Q2 |
| PROFUND ADVISORS LLC added | 33,403 | $608K | 0.0% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 32,137 | $585K | 0.0% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ new | 31,713 | $577K | 0.0% | 2026-Q2 |
| Leonteq Securities AG added | 30,000 | $546K | 0.0% | 2026-Q2 |
| Verdad Advisers, LP added | 28,987 | $528K | 0.0% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 28,584 | $521K | 0.0% | 2026-Q2 |
| ExodusPoint Capital Management, LP trimmed | 28,537 | $520K | 0.0% | 2026-Q2 |
| OPTIMIZE FINANCIAL INC. trimmed | 28,061 | $511K | 0.0% | 2026-Q2 |
| Sound Capital Solutions LLC new | 28,061 | $511K | 0.0% | 2026-Q2 |
| Legal & General Group Plc added | 27,477 | $500K | 0.0% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 26,090 | $475K | 0.0% | 2026-Q2 |
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.