Compass Therapeutics, Inc. (CMPX) Ownership
CMPX ownership summary
as of October 18, 2026- Institutions
- 88.6% of shares outstanding
- Insiders
- 12.47% of shares outstanding
- Shares outstanding
- 180.1M
- Float
- 132.4M shares available to trade
- Short interest
- 26.79% 40.4M shares short
- Days to cover
- 8.74 short interest down 3.1% vs prior month
- Institutions 88.56%
- Insiders 12.47%
CMPX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | TANG CAPITAL MANAGEMENT LLC | 9.99% | 18.0M | $15.5M | +1.2M (+7.1%) | June 30, 2026 |
| 2 | Orbimed Advisors LLC | 8.45% | 15.2M | $13.1M | — | June 30, 2026 |
| 3 | Suvretta Capital Management, LLC | 7.83% | 14.1M | $12.1M | −206,220 (−1.4%) | June 30, 2026 |
| 4 | BlackRock Inc | 6.26% | 11.3M | $9.7M | +1.8M (+18.7%) | June 30, 2026 |
| 5 | State Street Corp | 5.53% | 10.0M | $8.6M | +3.3M (+48.7%) | June 30, 2026 |
| 6 | Enavate Sciences GP, LLC | 4.32% | 7.8M | $6.7M | — | June 30, 2026 |
| 7 | Vivo Capital, LLC | 4.31% | 7.8M | $6.7M | −1.8M (−18.7%) | June 30, 2026 |
| 8 | Vanguard Capital Management, LLC | 3.40% | 6.1M | $5.3M | +81,607 (+1.4%) | June 30, 2026 |
| 9 | Palo Alto Investors, LLC | 3.24% | 5.8M | $5.0M | +4.3M (+285.1%) | June 30, 2026 |
| 10 | Millennium Management LLC | 2.62% | 4.7M | $4.1M | +3.9M (+457.0%) | June 30, 2026 |
| 11 | Geode Capital Management, LLC | 2.12% | 3.8M | $3.3M | +249,419 (+7.0%) | June 30, 2026 |
| 12 | Vanguard Portfolio Management, LLC | 2.09% | 3.8M | $3.2M | +2.7M (+248.3%) | June 30, 2026 |
| 13 | Qube Research & Technologies | 2.05% | 3.7M | $3.2M | +1.1M (+44.6%) | June 30, 2026 |
| 14 | Blue Owl Capital Holdings LP | 2.01% | 3.6M | $3.1M | +682,551 (+23.2%) | June 30, 2026 |
| 15 | Citadel Advisors Llc | 1.98% | 3.6M | $3.1M | +2.8M (+395.0%) | June 30, 2026 |
| 16 | The Goldman Sachs Group Inc | 1.96% | 3.5M | $3.0M | +1.5M (+77.0%) | June 30, 2026 |
| 17 | Rock Springs Capital Management LP | 1.96% | 3.5M | $3.0M | +219,621 (+6.6%) | June 30, 2026 |
| 18 | AQR Capital Management LLC | 1.95% | 3.5M | $3.0M | +3.3M (+1,650.8%) | June 30, 2026 |
| 19 | Birchview Capital, LP | 0.93% | 1.7M | $1.4M | +209,133 (+14.3%) | June 30, 2026 |
| 20 | Kingdon Capital Management LLC | 0.78% | 1.4M | $1.2M | +1.4M (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 16 holders added 28.8M shares and 2 cut 2.0M.
CMPX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | State Street® SPDR® S&P® Biotech ETF | 2.69% | 4.8M | $4.2M | −92,500 (−1.9%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.33% | 4.2M | $3.6M | — | August 31, 2026 |
| 3 | iShares Russell 2000 ETF | 1.93% | 3.5M | $3.0M | −40,064 (−1.1%) | September 30, 2026 |
| 4 | Fidelity Enhanced Small Cap Core ETF | 0.90% | 1.6M | $1.4M | +3,384 (+0.2%) | September 30, 2026 |
| 5 | Fidelity Small Cap Index | 0.79% | 1.4M | $1.2M | −1,760 (−0.1%) | July 31, 2026 |
| 6 | iShares Russell 2000 Value ETF | 0.68% | 1.2M | $1.0M | +1,848 (+0.2%) | September 30, 2026 |
| 7 | Vanguard Explorer Inv | 0.53% | 963K | $828,009 | +962,801 (0.0%) | June 30, 2026 |
| 8 | Royce Micro-Cap Trust | 0.47% | 839K | $721,694 | +504,530 (+150.8%) | June 30, 2026 |
| 9 | Fidelity Extended Market Index | 0.46% | 820K | $704,871 | −18,882 (−2.3%) | August 31, 2026 |
| 10 | Vanguard VIF Small Co Gr | 0.43% | 775K | $666,501 | +775,001 (0.0%) | June 30, 2026 |
| 11 | Vanguard Russell 2000 ETF | 0.42% | 755K | $648,908 | +19,079 (+2.6%) | August 31, 2026 |
| 12 | CREF Total Global Stock Account R3 | 0.40% | 720K | $618,847 | — | July 31, 2026 |
| 13 | Vanguard Strategic Small-Cap Equity Inv | 0.28% | 496K | $426,460 | +495,884 (0.0%) | June 30, 2026 |
| 14 | Goldman Sachs Small Cp Val Insghts Instl | 0.23% | 417K | $358,394 | +416,737 (0.0%) | July 31, 2026 |
| 15 | iShares Micro-Cap ETF | 0.23% | 414K | $355,663 | −2,852 (−0.7%) | September 30, 2026 |
| 16 | Vanguard Market Neutral I | 0.22% | 400K | $344,195 | +400,227 (0.0%) | June 30, 2026 |
| 17 | Royce Micro-Cap Invmt | 0.21% | 374K | $321,790 | +218,627 (+140.6%) | June 30, 2026 |
| 18 | Rhenman Healthcare Equity L/S RC2 SEK | 0.18% | 329K | $283,283 | +329,399 (0.0%) | January 31, 2026 |
| 19 | Schwab Small Cap Index | 0.18% | 322K | $277,255 | — | August 31, 2026 |
| 20 | Stt Strt SPDR® Russell2000 US SmCapETF | 0.16% | 297K | $255,344 | +14,208 (+5.0%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
CMPX insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-05-27 | Thomas J Schuetz | Buy | $2.11 | 10,000 | $21,100 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
CMPX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns CMPX
Institutional investors own 88.6% of Compass Therapeutics's shares and insiders 12.47%. The largest holder is TANG CAPITAL MANAGEMENT LLC with 9.99% of the shares (18.0M), as of June 30, 2026. Among the top 20 institutions, 16 added shares and 2 reduced their stake in the latest filings. Short interest is 26.79% of the float, or 8.74 days of average trading volume. The share count rose 3,596.9% since 2018.
Related: CMPX analyst forecast, CMPX key metrics. See the CMPX stock overview for the latest quote and news.
CMPX ownership FAQ
Who owns the most Compass Therapeutics stock?
The largest shareholders of Compass Therapeutics are TANG CAPITAL MANAGEMENT LLC (9.99%), Orbimed Advisors LLC (8.45%), Suvretta Capital Management, LLC (7.83%), BlackRock Inc (6.26%), State Street Corp (5.53%).
What percentage of Compass Therapeutics is owned by institutions?
Institutions hold 88.6% of Compass Therapeutics's shares outstanding; insiders hold 12.47%.
Which funds own Compass Therapeutics?
The largest fund holders of Compass Therapeutics are State Street® SPDR® S&P® Biotech ETF (2.69%), Vanguard MStar Total Stk Mkt Idx Invest (2.33%), iShares Russell 2000 ETF (1.93%), Fidelity Enhanced Small Cap Core ETF (0.90%), Fidelity Small Cap Index (0.79%).
What is Compass Therapeutics's short interest?
40.4M shares of Compass Therapeutics were sold short, 26.79% of the float; at the average daily volume it would take 8.74 days to cover.
Are insiders buying or selling Compass Therapeutics?
Of the latest 1 reported insider transactions in Compass Therapeutics (since May 27, 2025), 1 were purchases and 0 were sales.
How many shares of Compass Therapeutics are outstanding?
Compass Therapeutics has 180.1M shares outstanding, of which 132.4M are in the public float.