Compass Therapeutics, Inc.
CMPX- Exchange
- Nasdaq
- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001738021
In the last 90 days, Compass Therapeutics, Inc. insiders filed 1 open-market purchase and 0 sales; 215 institutions reported holding it in 13F filings for Q2 2026, worth $363.4M in total; no superinvestor holds it.
Holders of 5% or more of CMPX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Compass Therapeutics, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Tang Capital Management LLC | 13G/A | 9.99%17.2M shares | 0.00 ppfrom 9.99% | Jan 16, 20255 filings | Nov 14, 2025 | SEC |
| OrbiMed Advisors LLC | 13D/A | 8.90%15.2M shares | −2.10 ppfrom 11.00% | Apr 11, 20252 filings | Aug 15, 2025 | SEC |
| Suvretta Capital Management, LLC | 13G/A | 8.20%14.1M shares | +3.00 ppfrom 5.20% | Aug 13, 20252 filings | Aug 21, 2025 | SEC |
| BlackRock, Inc. | 13G | 5.20%9.27M shares | +0.60 ppfrom 4.60% | Feb 4, 20253 filings | Jan 21, 2026 | SEC |
| Vivo Opportunity Fund Holdings, L.P. | 13G | 5.10%9.00M shares | New | Nov 14, 20251 filing | Nov 14, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
22 Schedule 13D and 13G filings on Compass Therapeutics, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| May 15, 20264:06 PM ET | Biotechnology Value Fund L Pand 9 others | 13G/A | 4.30%7.76M shares | −0.80 ppfrom 5.10%Below 5% | Mar 31, 2026 | SEC |
| Feb 13, 20264:30 PM ET | Blackstone Holdings II L.P.and 7 others | 13G/A | 3.40%6.13M shares | –Below 5% | Dec 31, 2025 | SEC |
| Jan 21, 202612:30 PM ET | BlackRock, Inc. | 13G | 5.20%9.27M shares | +0.60 ppfrom 4.60% | Dec 31, 2025 | SEC |
| Nov 14, 20256:35 PM ET | Vivo Opportunity Fund Holdings, L.P.and 3 others | 13G | 5.10%9.00M shares | New | Sep 30, 2025 | SEC |
| Nov 14, 20254:17 PM ET | Tang Capital Management LLCand 5 others | 13G/A | 9.99%17.2M shares | 0.00 ppfrom 9.99% | Sep 30, 2025 | SEC |
| Nov 14, 20254:15 PM ET | Tang Capital Management LLCand 5 others | 13G/A | 9.99%17.2M shares | +0.19 ppfrom 9.80% | Sep 30, 2025 | SEC |
| Oct 29, 20255:24 PM ET | Biotechnology Value Fund L Pand 9 others | 13G | 5.10%8.75M shares | New | Oct 22, 2025 | SEC |
| Aug 21, 20259:07 AM ET | Suvretta Capital Management, LLCand 2 others | 13G/A | 8.20%14.1M shares | +3.00 ppfrom 5.20% | Aug 13, 2025 | SEC |
| Aug 18, 20256:35 PM ET | Commander Aggregator, LPand 3 others | 13D/A | 4.50%7.79M shares | –Below 5% | Aug 14, 2025 | SEC |
| Aug 15, 20255:28 PM ET | OrbiMed Advisors LLCand 1 other | 13D/A | 8.90%15.2M shares | −2.10 ppfrom 11.00% | Aug 13, 2025 | SEC |
| Aug 14, 20254:15 PM ET | Tang Capital Management LLCand 5 others | 13G/A | 9.80%13.5M shares | +1.80 ppfrom 8.00% | Jun 30, 2025 | SEC |
| Aug 14, 202510:49 AM ET | RTW Investments, LPand 1 other | 13G/A | 0.00%0 shares | −9.90 ppfrom 9.90%Below 5% | Jun 30, 2025 | SEC |
| Aug 14, 20258:05 AM ET | RTW Investments, LPand 1 other | 13G/A | 9.90%9.47M shares | – | Jun 30, 2025 | SEC |
| Aug 13, 20258:21 PM ET | Suvretta Capital Management, LLCand 2 others | 13G | 5.20%7.15M shares | New | Jun 30, 2025 | SEC |
| Aug 12, 20254:29 PM ET | MPM Oncology Impact Management LP | 13G/A | 4.10%5.62M shares | −2.10 ppfrom 6.20%Below 5% | Jun 30, 2025 | SEC |
| Jul 16, 20257:02 PM ET | BlackRock, Inc. | 13G/A | 4.60%6.40M shares | −0.40 ppfrom 5.00%Below 5% | Jun 30, 2025 | SEC |
| May 15, 20254:15 PM ET | Tang Capital Management LLCand 5 others | 13G/A | 8.00%11.1M shares | +2.60 ppfrom 5.40% | Mar 31, 2025 | SEC |
| Apr 11, 20257:21 PM ET | OrbiMed Advisors LLCand 3 others | 13D/A | 11.00%15.2M shares | – | Apr 9, 2024 | SEC |
| Feb 14, 20254:11 PM ET | MPM Oncology Impact Management LP | 13G | 6.20%8.57M shares | New | Dec 31, 2024 | SEC |
| Feb 12, 20259:39 AM ET | Adage Capital Partners GP, L.L.C.and 3 others | 13G/A | 4.36%5.99M shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 4, 20253:45 PM ET | BlackRock, Inc. | 13G | 5.00%6.89M shares | New | Dec 31, 2024 | SEC |
| Jan 16, 20255:17 PM ET | Tang Capital Management LLCand 5 others | 13G | 5.40%7.40M shares | New | Jan 8, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Compass Therapeutics, Inc. shares.
No Form 144 notices for Compass Therapeutics, Inc. are on file.