Who owns CMPX?
Institutional ownership of Compass Therapeutics Inc. from Form 13F, Q2 2026
216 institutional managers reported holding Compass Therapeutics Inc. (CMPX) in Form 13F filings for Q2 2026, with 165,706,285 shares worth $363M. The largest reported holder was Tang Capital Management LLC. Managers that filed both quarters cut a net 7,853,751 shares (-4.5%). 61 opened new positions and 45 sold out.
- Funds holding
- 216
- Value held
- $363M
- New / sold out
- 61 / 45
- Net shares, same filers
- -4.5%
Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
Largest holders of CMPX
| Fund | Value | Share of 13F holdings | Shares | Move |
|---|---|---|---|---|
| Tang Capital Management LLC | $39.4M | 10.9% | 17,990,782 | Added |
| Orbimed Advisors LLC | $33.3M | 9.2% | 15,219,994 | Unchanged |
| Montanova Capital, LLC | $30.9M | 8.5% | 14,101,159 | Trimmed |
| BlackRock, Inc. | $24.7M | 6.8% | 11,281,781 | Added |
| State Street Corp | $21.8M | 6.0% | 9,953,653 | Added |
| Enavate Sciences GP, LLC | $17.1M | 4.7% | 7,788,150 | Unchanged |
| Vivo Capital, LLC | $17.0M | 4.7% | 7,757,060 | Trimmed |
| Vanguard Capital Management LLC | $13.4M | 3.7% | 6,118,782 | Added |
| Palo Alto Investors LP | $12.8M | 3.5% | 5,831,813 | Added |
| Millennium Management LLC | $10.3M | 2.8% | 4,713,247 | Added |
| Geode Capital Management, LLC | $8.4M | 2.3% | 3,815,189 | Added |
| Vanguard Portfolio Management LLC | $8.3M | 2.3% | 3,771,032 | Added |
| Qube Research & Technologies Ltd | $8.1M | 2.2% | 3,687,489 | Added |
| Blue Owl Capital Holdings LP | $7.9M | 2.2% | 3,624,076 | Added |
| Citadel Advisors LLC | $7.8M | 2.2% | 3,570,674 | Added |
| Goldman Sachs Group Inc | $7.7M | 2.1% | 3,531,000 | Added |
| Rock Springs Capital Management LP | $7.7M | 2.1% | 3,524,929 | Added |
| AQR Capital Management LLC | $7.7M | 2.1% | 3,509,137 | Added |
| Birchview Capital, LP | $3.7M | 1.0% | 1,675,000 | Added |
| Kingdon Capital Management, L.l.c. | $3.1M | 0.8% | 1,400,000 | New |
| Fisher Asset Management, LLC | $3.0M | 0.8% | 1,391,890 | Added |
| Royce & Associates LP | $2.9M | 0.8% | 1,336,780 | Trimmed |
| FMR LLC | $2.7M | 0.7% | 1,212,196 | Trimmed |
| Adage Capital Partners GP, L.l.c. | $2.6M | 0.7% | 1,186,500 | Trimmed |
| Acadian Asset Management LLC | $2.5M | 0.7% | 1,161,231 | New |
Share of 13F holdings is each fund's shares as a share of the 165,706,285 CMPX shares all 13F filers reported, not of shares outstanding.
Biggest buyers in Q2 2026
- Palo Alto Investors LP Added+$9.5M
- Millennium Management LLC Added+$8.5M
- AQR Capital Management LLC Added+$7.2M
- State Street Corp Added+$7.1M
- Citadel Advisors LLC Added+$6.2M
- Vanguard Portfolio Management LLC Added+$5.9M
- BlackRock, Inc. Added+$3.9M
- Goldman Sachs Group Inc Added+$3.4M
- Kingdon Capital Management, L.l.c. New+$3.1M
- Tang Capital Management LLC Added+$2.6M
Biggest sellers in Q2 2026
- BVF Inc Sold out-$41.1M
- RTW Investments, LP Sold out-$22.1M
- Deerfield Management Company, L.p. Sold out-$19.1M
- Logos Global Management LP Sold out-$16.7M
- Adage Capital Partners GP, L.l.c. Trimmed-$16.0M
- Sofinnova Investments, Inc. Sold out-$10.9M
- Braidwell LP Sold out-$10.4M
- Ameriprise Financial Inc Sold out-$8.4M
- Great Point Partners LLC Sold out-$7.1M
- Balyasny Asset Management L.P. Sold out-$5.9M
The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $91.2M and sold $209M; 85 added and 44 trimmed.
Schedule 13D and 13G filings on CMPX
Owners of more than 5% must file within days, so these can be newer than the 13F data.
- 2026-08-07STATE STREET CORP SCHEDULE 13G filed by Compass Therapeutics Inc.Schedule 13G
- 2026-01-21BlackRock, Inc. SCHEDULE 13G filed by BlackRock Inc.Schedule 13G
- 2025-10-29BIOTECHNOLOGY VALUE FUND L P SCHEDULE 13G filed by Compass Therapeutics Inc.Schedule 13G
- 2025-08-14SUVRETTA CAPITAL MANAGEMENT, LLC SCHEDULE 13G filed by Compass Therapeutics Inc.Schedule 13G
- 2025-02-14MPM BioImpact LLC SCHEDULE 13G filed by Compass Therapeutics Inc.Schedule 13G
- 2025-02-04BlackRock, Inc. SCHEDULE 13G filed by BlackRock Inc.Schedule 13G
- 2025-01-16TANG CAPITAL MANAGEMENT LLC SCHEDULE 13G filed by Compass Therapeutics Inc.Schedule 13G
Questions about CMPX ownership
- Who owns CMPX stock?
- 216 institutional investment managers reported CMPX positions in their Form 13F filings for Q2 2026, holding 165,706,285 shares worth $363M in total. Tang Capital Management LLC reported the largest position.
- Are funds buying or selling CMPX?
- In Q2 2026, 61 managers opened new CMPX positions, 85 added, 44 trimmed and 45 sold out. Managers that filed in both quarters sold a net 7,853,751 shares.
- How current is this CMPX institutional ownership data?
- It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to CMPX by CUSIP. Options are left out. CMPX news and filings · CMPX insider trades · Top funds