Who owns Compass Therapeutics (CMPX)
Which tracked institutional funds hold CMPX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CMPX 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 CMPX is one-sided between 2026-Q1 and 2026-Q2: 20 added or opened and 77 trimmed or exited — on balance reducing.
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
CMPX’s largest tracked holder by dollar value, TANG CAPITAL MANAGEMENT LLC, sizes it at 1.8% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.8pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CMPX 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 209 tracked filers holding CMPX, 146 increased or opened the position and 94 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
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 CMPX 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
- KINGDON CAPITAL MANAGEMENT, L.L.C.$3M
- FIRST TRUST ADVISORS LP$2M
- Point72 Asset Management, L.P.$2M
- CM Management, LLC$1M
- Artia Global Partners LP$839K
- MARSHALL WACE, LLP$733K
Full exits 21
- BVF INC/IL$41M
- RTW INVESTMENTS, LP$22M
- DEERFIELD MANAGEMENT COMPANY, L.P.$19M
- Logos Global Management LP$17M
- Sofinnova Investments, Inc.$11M
- BRAIDWELL LP$10M
Largest adds
- AQR CAPITAL MANAGEMENT LLC$7M
- MILLENNIUM MANAGEMENT LLC$6M
- Palo Alto Investors LP$5M
- CITADEL ADVISORS LLC$4M
- VANGUARD PORTFOLIO MANAGEMENT LLC$3M
- Squarepoint Ops LLC$2M
Largest trims
- TANG CAPITAL MANAGEMENT LLC$49M
- ORBIMED ADVISORS LLC$47M
- MONTANOVA CAPITAL, LLC$45M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$42M
- Vivo Capital, LLC$34M
- BlackRock, Inc.$26M
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 |
|---|---|---|---|---|
| TANG CAPITAL MANAGEMENT LLC added | 17,990,782 | $39M | 11.1% | 2026-Q2 |
| ORBIMED ADVISORS LLC | 15,219,994 | $33M | 9.4% | 2026-Q2 |
| MONTANOVA CAPITAL, LLC trimmed | 14,101,159 | $31M | 8.7% | 2026-Q2 |
| BlackRock, Inc. added | 11,281,781 | $25M | 6.9% | 2026-Q2 |
| STATE STREET CORP added | 9,953,653 | $22M | 6.1% | 2026-Q2 |
| ENAVATE SCIENCES GP, LLC | 7,788,150 | $17M | 4.8% | 2026-Q2 |
| Vivo Capital, LLC trimmed | 7,757,060 | $17M | 4.8% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 6,118,782 | $13M | 3.8% | 2026-Q2 |
| Palo Alto Investors LP added | 5,831,813 | $13M | 3.6% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 4,713,247 | $10M | 2.9% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 3,815,189 | $8M | 2.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 3,771,032 | $8M | 2.3% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 3,687,489 | $8M | 2.3% | 2026-Q2 |
| Blue Owl Capital Holdings LP added | 3,624,076 | $8M | 2.2% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 3,570,674 | $8M | 2.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 3,531,000 | $8M | 2.2% | 2026-Q2 |
| Rock Springs Capital Management LP added | 3,524,929 | $8M | 2.2% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 3,509,137 | $8M | 2.2% | 2026-Q2 |
| Birchview Capital, LP added | 1,675,000 | $4M | 1.0% | 2026-Q2 |
| KINGDON CAPITAL MANAGEMENT, L.L.C. new | 1,400,000 | $3M | 0.9% | 2026-Q2 |
| Fisher Asset Management, LLC added | 1,391,890 | $3M | 0.9% | 2026-Q2 |
| ROYCE & ASSOCIATES LP trimmed | 1,336,780 | $3M | 0.8% | 2026-Q2 |
| FMR LLC trimmed | 1,212,196 | $3M | 0.7% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 1,186,500 | $3M | 0.7% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,140,914 | $2M | 0.7% | 2026-Q2 |
| Atle Fund Management AB added | 1,048,593 | $2M | 0.6% | 2026-Q2 |
| Nuveen, LLC added | 1,010,562 | $2M | 0.6% | 2026-Q2 |
| Squarepoint Ops LLC added | 1,007,507 | $2M | 0.6% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 1,000,938 | $2M | 0.6% | 2026-Q2 |
| Blackstone Inc. trimmed | 899,936 | $2M | 0.6% | 2026-Q2 |
| FIRST TRUST ADVISORS LP new | 807,004 | $2M | 0.5% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 789,399 | $2M | 0.5% | 2026-Q2 |
| KVP Capital Advisors, LP added | 771,000 | $2M | 0.5% | 2026-Q2 |
| MORGAN STANLEY added | 735,186 | $2M | 0.5% | 2026-Q2 |
| CITIGROUP INC added | 713,907 | $2M | 0.4% | 2026-Q2 |
| UBS Group AG trimmed | 712,763 | $2M | 0.4% | 2026-Q2 |
| Burkehill Global Management, LP | 700,000 | $2M | 0.4% | 2026-Q2 |
| Point72 Asset Management, L.P. new | 686,577 | $2M | 0.4% | 2026-Q2 |
| ACUTA CAPITAL PARTNERS, LLC trimmed | 595,213 | $1M | 0.4% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 566,919 | $1M | 0.3% | 2026-Q2 |
| CM Management, LLC added | 550,000 | $1M | 0.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 541,178 | $1M | 0.3% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 523,777 | $1M | 0.3% | 2026-Q2 |
| Artia Global Partners LP new | 383,200 | $839K | 0.2% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 378,687 | $829K | 0.2% | 2026-Q2 |
| ArrowMark Colorado Holdings LLC trimmed | 364,742 | $799K | 0.2% | 2026-Q2 |
| Bank of New York Mellon Corp added | 351,032 | $769K | 0.2% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 334,869 | $733K | 0.2% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 320,312 | $701K | 0.2% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 308,295 | $675K | 0.2% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 308,110 | $675K | 0.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 303,139 | $664K | 0.2% | 2026-Q2 |
| NATIXIS new | 297,715 | $652K | 0.2% | 2026-Q2 |
| Exome Asset Management LLC new | 276,165 | $605K | 0.2% | 2026-Q2 |
| Caption Management, LLC added | 263,577 | $577K | 0.2% | 2026-Q2 |
| Seven Fleet Capital Management LP trimmed | 233,066 | $510K | 0.1% | 2026-Q2 |
| DV EQUITIES, LLC new | 233,066 | $510K | 0.1% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 222,179 | $487K | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 217,485 | $476K | 0.1% | 2026-Q2 |
| Orion Porfolio Solutions, LLC new | 213,863 | $468K | 0.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 204,487 | $448K | 0.1% | 2026-Q2 |
| Rafferty Asset Management, LLC trimmed | 190,126 | $416K | 0.1% | 2026-Q2 |
| Creative Planning added | 182,841 | $400K | 0.1% | 2026-Q2 |
| ALPS ADVISORS INC added | 182,777 | $400K | 0.1% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 177,814 | $389K | 0.1% | 2026-Q2 |
| Mariner, LLC added | 172,821 | $378K | 0.1% | 2026-Q2 |
| Swiss National Bank trimmed | 171,700 | $376K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 161,880 | $856K | 0.2% | 2026-Q2 |
| Virtus Investment Advisers, LLC added | 161,181 | $353K | 0.1% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 160,900 | $352K | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 158,444 | $347K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 134,350 | $294K | 0.1% | 2026-Q2 |
| IEQ CAPITAL, LLC new | 122,948 | $269K | 0.1% | 2026-Q2 |
| ADAR1 Capital Management, LLC trimmed | 122,132 | $267K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 109,793 | $240K | 0.1% | 2026-Q2 |
| Quadrature Capital Ltd added | 108,250 | $237K | 0.1% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV new | 106,570 | $233K | 0.1% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC new | 105,113 | $230K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 104,251 | $229K | 0.1% | 2026-Q2 |
| PROFUND ADVISORS LLC added | 95,209 | $209K | 0.1% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC trimmed | 92,227 | $202K | 0.1% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 90,044 | $197K | 0.1% | 2026-Q2 |
| Jain Global LLC new | 88,302 | $193K | 0.1% | 2026-Q2 |
| SmartHarvest Portfolios, LLC added | 86,508 | $189K | 0.1% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC new | 83,567 | $195K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 82,459 | $180K | 0.1% | 2026-Q2 |
| GROUP ONE TRADING LLC added | 81,557 | $179K | 0.1% | 2026-Q2 |
| Cerity Partners LLC new | 80,973 | $177K | 0.0% | 2026-Q2 |
| OPTIMIZE FINANCIAL INC. trimmed | 80,160 | $176K | 0.0% | 2026-Q2 |
| Sound Capital Solutions LLC new | 80,160 | $176K | 0.0% | 2026-Q2 |
| Legal & General Group Plc | 75,103 | $164K | 0.0% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 74,689 | $164K | 0.0% | 2026-Q2 |
| MetLife Investment Management, LLC added | 71,421 | $156K | 0.0% | 2026-Q2 |
| Invesco Ltd. trimmed | 69,818 | $153K | 0.0% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 68,217 | $149K | 0.0% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 67,713 | $148K | 0.0% | 2026-Q2 |
| ExodusPoint Capital Management, LP added | 67,478 | $148K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 61,158 | $134K | 0.0% | 2026-Q2 |
| Wealthcare Advisory Partners LLC new | 60,962 | $134K | 0.0% | 2026-Q2 |
| Quantbot Technologies LP added | 60,826 | $133K | 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.