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CMPX · NASDAQ · Biotechnology

Compass Therapeutics (CMPX)

Develops oncology antibody candidates for tumor microenvironment biology.

$2.43

Pre-market−0.00 (−0.06%)

At close$2.44(+5.41%)

Watchlist

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Breakdown13F · 13D/G · Form 4

Institutions209 holders · as of Mar 31, 2026 · largest filers plus last quarter's tail	≈ 95.09%	171.25M shares
Insiders3 holders · as of Apr 30, 2026	0.62%	1.12M shares
Otherremainder	≈ 4.29%	7.72M shares

180.09M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing

This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
Tang Capital Management LLCInstitution	9.32%	16.79M	13Fas of Mar 31, 2026
Orbimed Advisors LLCInstitution	8.45%	15.22M	13Fas of Mar 31, 2026
Suvretta Capital Management, LLCInstitution	7.94%	14.31M	13Fas of Mar 31, 2026
Vivo Capital, LLCInstitution	5.30%	9.55M	13Fas of Mar 31, 2026
BlackRock, Inc.Institution	5.28%	9.51M	13Fas of Mar 31, 2026
Vivo Opportunity Fund Holdings, L.P.Institution	5.00%	9.00M	13Gfiled Nov 14, 2025 ↗
Adage Capital Partners GP, L.L.C.Institution	4.71%	8.49M	13Fas of Mar 31, 2026
Enavate Sciences GP, LLCInstitution	4.32%	7.79M	13Fas of Mar 31, 2026
BVF Inc/ILInstitution	4.31%	7.76M	13Fas of Mar 31, 2026
State Street CorpInstitution	3.72%	6.69M	13Fas of Mar 31, 2026
Vanguard Capital Management LLCInstitution	3.35%	6.04M	13Fas of Mar 31, 2026
RTW Investments, LPInstitution	2.32%	4.19M	13Fas of Mar 31, 2026
Deerfield Management Company, L.P. (Series C)Institution	2.00%	3.61M	13Fas of Mar 31, 2026
Geode Capital Management, LLCInstitution	1.98%	3.57M	13Fas of Mar 31, 2026
Rock Springs Capital Management LPInstitution	1.84%	3.31M	13Fas of Mar 31, 2026
Logos Global Management LPInstitution	1.75%	3.15M	13Fas of Mar 31, 2026
Blue Owl Capital Holdings LPInstitution	1.63%	2.94M	13Fas of Mar 31, 2026
Qube Research & Technologies LtdInstitution	1.42%	2.55M	13Fas of Mar 31, 2026
UBS Group AGInstitution	1.33%	2.39M	13Fas of Mar 31, 2026
Sofinnova Investments, Inc.Institution	1.14%	2.06M	13Fas of Mar 31, 2026
Goldman Sachs Group IncInstitution	1.11%	2.00M	13Fas of Mar 31, 2026
Braidwell LPInstitution	1.09%	1.97M	13Fas of Mar 31, 2026
Blackstone Inc.Institution	1.03%	1.86M	13Fas of Mar 31, 2026
FMR LLCInstitution	1.00%	1.80M	13Fas of Mar 31, 2026
Royce & Associates LPInstitution	0.90%	1.62M	13Fas of Mar 31, 2026

13F — a manager's quarterly holdings · 13D/13G — an ownership statement filed at 5% or more

Institutions13F, as of Mar 31, 2026

209 holders · 171.25M shares · 53 new positions · 126 increased · 49 reduced · 23 closed

Holder	Shares	% outstanding	Chg q/q	Filed
Tang Capital Management LLC	16.79M	9.32%	0	May 15, 2026
Orbimed Advisors LLC	15.22M	8.45%	0	May 15, 2026
Suvretta Capital Management, LLC	14.31M	7.94%	+125.0K	May 15, 2026
Vivo Capital, LLC	9.55M	5.30%	0	May 20, 2026
BlackRock, Inc.	9.51M	5.28%	+117.5K	May 13, 2026
Adage Capital Partners GP, L.L.C.	8.49M	4.71%	+4.05M	May 15, 2026
Enavate Sciences GP, LLC	7.79M	4.32%	0	May 15, 2026
BVF Inc/IL	7.76M	4.31%	0	May 15, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
Tang Capital Management, LLC	9.99%	17.18M	13G	Nov 14, 2025 ↗
RTW Investments, LP	9.90%	9.47M	13G	Aug 14, 2025 ↗
Orbimed Advisors LLCincl. Orbimed Capital GP V LLC	8.90%	15.22M	13D	Aug 15, 2025 ↗
Suvretta Capital Management, LLC	8.20%	14.10M	13G	Aug 21, 2025 ↗
BlackRock, Inc.	5.20%	9.27M	13G	Jan 21, 2026 ↗
Vivo Opportunity Fund Holdings, L.P.	5.10%	9.00M	13G	Nov 14, 2025 ↗

Insider tradesForm 4

Latest trades

Date	Insider	Type	Shares	Avg price	Owned after
Apr 29, 2026	Jonathan Andermanofficer: General Counsel	Purchase	25,000	$1.89	196,000
Apr 29, 2026	Neil Lernerofficer: Chief Accounting Officer	Purchase	15,000	$1.89	397,500

CongressHouse and Senate disclosures

Not reported.