CMPX · Compass Therapeutics, Inc. · Shareholders & Ownership

$0.84 +0.01 (+0.61%)

Russell 2000 member Rebalance outlook locked

Market Cap

$150.37M

180.09M

Volume · Oct 19 3.12M Avg daily vol (3M) 4.28M

Every disclosed holder of CMPX in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns CMPX

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	215	165,728,086	92.03%	Yes
Insiders (Forms 3, 4, 5)	5	22,964,330	12.75%	Yes
13D/G-only blocks	4	27,706,260	15.38%	Yes
Remaining	—	36,310,761	-20.16%	Negative
Registered funds (N-PORT, not summed)	143	33,586,414	18.65%	No

Shares outstanding: 180,087,915, the issuer's latest cover-page count restated onto today's split basis.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of CMPX

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	TANG CAPITAL MANAGEMENT LLC 13F CIK 1232621 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	17,990,782	9.99%	+1,199,973	Jun 30, 2026	carried, not yet filed for the newest quarter
2	GORDON CARL L Insider CIK 1282930 · Apr 9, 2025 Director, issuer-wide	15,219,994	8.45%	—	Apr 9, 2025	Director, issuer-wide
3	ORBIMED ADVISORS LLC 13F CIK 1055951 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	15,219,994	8.45%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	ORBIMED ADVISORS LLC Insider CIK 1055951 · Apr 9, 2025 10% Owner, issuer-wide, not summed	15,219,994	8.45%	—	Apr 9, 2025	10% Owner, issuer-wide, not summed
4	SUVRETTA CAPITAL MANAGEMENT, LLC 13F CIK 1569064 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	14,101,159	7.83%	-206,220	Jun 30, 2026	carried, not yet filed for the newest quarter
5	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	11,281,781	6.26%	+1,775,701	Jun 30, 2026	carried, not yet filed for the newest quarter
5.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	3,458,620	1.92%	+295,874	Jun 30, 2026	iShares Trust, not summed
5.2	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	1,212,664	0.67%	+690,236	Jun 30, 2026	iShares Trust, not summed
5.3	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	440,826	0.24%	+115,752	Jun 30, 2026	iShares Trust, not summed
5.4	iShares Core S&P Total U.S. Stock Market ETF Fund S000004317 · Registered fund · Jun 30, 2026 iShares Trust, not summed	243,131	0.14%	+5,712	Jun 30, 2026	iShares Trust, not summed
5.5	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	221,492	0.12%	0	Jun 30, 2026	Quantitative Master Series LLC, not summed
6	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	9,953,653	5.53%	+3,258,677	Jun 30, 2026	carried, not yet filed for the newest quarter
6.1	STATE STREET CORP 13G CIK 93751 · Bank · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	9,953,653	5.53%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
6.2	State Street(R) SPDR(R) S&P(R) Biotech ETF Fund S000010018 · Registered fund · Jun 30, 2026 SPDR SERIES TRUST, not summed	6,839,827	3.80%	+3,154,838	Jun 30, 2026	SPDR SERIES TRUST, not summed
6.3	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	43,100	0.02%	-2,800	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
6.4	State Street(R) SPDR(R) Portfolio MSCI Global Stock Market ETF Fund S000036082 · Registered fund · Jun 30, 2026 SPDR INDEX SHARES FUNDS, not summed	11,048	0.01%	—	Jun 30, 2026	SPDR INDEX SHARES FUNDS, not summed
6.5	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	2,517	0.00%	-503	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
7	BIOTECHNOLOGY VALUE FUND L P 13G CIK 918923 · Unknown · Oct 22, 2025 Rule 13d-1(c), passive investor	8,750,000	4.86%	—	Oct 22, 2025	Rule 13d-1(c), passive investor
8	Commander Aggregator, LP 13D CIK 1953093 · Unknown · Aug 14, 2025 not summed	7,788,150	4.32%	—	Aug 14, 2025	not summed
9	ENAVATE SCIENCES GP, LLC 13F CIK 1953107 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	7,788,150	4.32%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
10	Vivo Capital, LLC 13F CIK 1674712 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	7,757,060	4.31%	-1,788,406	Jun 30, 2026	carried, not yet filed for the newest quarter
11	Vivo Opportunity Fund Holdings, L.P. 13G CIK 1930214 · Unknown · Jun 30, 2026 Rule 13d-1(c), passive investor	7,207,573	4.00%	—	Jun 30, 2026	Rule 13d-1(c), passive investor
12	Schuetz Thomas J. Insider CIK 1591464 · Feb 8, 2026 Director, CHIEF EXECUTIVE OFFICER, issuer-wide	6,603,336	3.67%	-36,687	Feb 8, 2026	Director, CHIEF EXECUTIVE OFFICER, issuer-wide
13	Blackstone Holdings II L.P. 13G CIK 1484870 · Unknown · Dec 31, 2025 Rule 13d-1(c), passive investor	6,126,182	3.40%	—	Dec 31, 2025	Rule 13d-1(c), passive investor
14	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	6,118,782	3.40%	+81,607	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Palo Alto Investors LP 13F CIK 1306923 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	5,831,813	3.24%	+4,317,309	Jun 30, 2026	carried, not yet filed for the newest quarter
16	MPM BIOIMPACT LLC 13G CIK 1687078 · Investment adviser · Jun 30, 2025 Rule 13d-1(b), qualified institution	5,622,505	3.12%	-2,945,391	Jun 30, 2025	Rule 13d-1(b), qualified institution
17	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,713,247	2.62%	+3,867,027	Jun 30, 2026	carried, not yet filed for the newest quarter
18	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	4,190,754	2.33%	-100	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
19	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,815,189	2.12%	+249,419	Jun 30, 2026	carried, not yet filed for the newest quarter
20	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,771,032	2.09%	+2,688,381	Jun 30, 2026	carried, not yet filed for the newest quarter
21	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,687,489	2.05%	+1,137,133	Jun 30, 2026	carried, not yet filed for the newest quarter
22	Blue Owl Capital Holdings LP 13F CIK 1858703 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,624,076	2.01%	+682,551	Jun 30, 2026	carried, not yet filed for the newest quarter
23	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,570,674	1.98%	+2,849,264	Jun 30, 2026	carried, not yet filed for the newest quarter
24	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	3,531,000	1.96%	+1,535,606	Jun 30, 2026	carried, not yet filed for the newest quarter
24.1	Goldman Sachs Small Cap Value Insights Fund Fund S000014929 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	416,737	0.23%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
24.2	Goldman Sachs Small Cap Equity Insights Fund Fund S000009329 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	143,997	0.08%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
24.3	Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF Fund S000048296 · Registered fund · May 31, 2026 Goldman Sachs ETF Trust, not summed	46,574	0.03%	—	May 31, 2026	Goldman Sachs ETF Trust, not summed
24.4	Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund Fund S000009355 · Registered fund · Jun 30, 2026 Goldman Sachs Variable Insurance Trust, not summed	32,837	0.02%	—	Jun 30, 2026	Goldman Sachs Variable Insurance Trust, not summed
24.5	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	13,853	0.01%	+206	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
25	Rock Springs Capital Management LP 13F CIK 1595725 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,524,929	1.96%	+219,621	Jun 30, 2026	carried, not yet filed for the newest quarter
26	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,509,137	1.95%	+3,308,709	Jun 30, 2026	carried, not yet filed for the newest quarter
27	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,794,339	1.00%	+83,395	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
28	Birchview Capital, LP 13F CIK 1618205 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,675,000	0.93%	+209,133	Jun 30, 2026	carried, not yet filed for the newest quarter
29	KINGDON CAPITAL MANAGEMENT, L.L.C. 13F CIK 1000097 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,400,000	0.78%	+1,400,000	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Fisher Asset Management, LLC 13F CIK 850529 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,391,890	0.77%	+43,631	Jun 30, 2026	carried, not yet filed for the newest quarter
31	ROYCE & ASSOCIATES LP 13F CIK 906304 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,336,780	0.74%	-283,018	Jun 30, 2026	carried, not yet filed for the newest quarter
31.1	Royce Micro-Cap Fund Fund S000009506 · Registered fund · Jun 30, 2026 ROYCE FUND, not summed	323,411	0.18%	+167,864	Jun 30, 2026	ROYCE FUND, not summed
31.2	Royce Capital Fund - Micro-Cap Portfolio Fund S000009496 · Registered fund · Jun 30, 2026 ROYCE CAPITAL FUND, not summed	106,692	0.06%	+56,929	Jun 30, 2026	ROYCE CAPITAL FUND, not summed
32	FMR LLC 13F CIK 315066 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,212,196	0.67%	-589,525	Jun 30, 2026	carried, not yet filed for the newest quarter
32.1	Fidelity Small Cap Index Fund Fund S000033638 · Registered fund · Jul 31, 2026 Fidelity Salem Street Trust, not summed	1,428,698	0.79%	+155,081	Jul 31, 2026	Fidelity Salem Street Trust, not summed
32.2	Fidelity Enhanced Small Cap Core ETF Fund S000081807 · Registered fund · Jun 30, 2026 Fidelity Covington Trust, not summed	1,122,143	0.62%	—	Jun 30, 2026	Fidelity Covington Trust, not summed
32.3	Fidelity Extended Market Index Fund Fund S000006021 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	798,947	0.44%	-6,630	May 31, 2026	Fidelity Concord Street Trust, not summed
32.4	Fidelity Total Market Index Fund Fund S000006026 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	278,340	0.15%	0	May 31, 2026	Fidelity Concord Street Trust, not summed
32.5	Fidelity Series Total Market Index Fund Fund S000065248 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	235,188	0.13%	+12,842	May 31, 2026	Fidelity Concord Street Trust, not summed
33	ADAGE CAPITAL PARTNERS GP, L.L.C. 13F CIK 1165408 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,186,500	0.66%	-7,300,000	Jun 30, 2026	carried, not yet filed for the newest quarter
34	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,161,231	0.64%	+1,161,231	Jun 30, 2026	carried, not yet filed for the newest quarter
35	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,140,914	0.63%	+92,356	Jun 30, 2026	carried, not yet filed for the newest quarter
36	Atle Fund Management AB 13F CIK 1381843 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,048,593	0.58%	+1,006,762	Jun 30, 2026	carried, not yet filed for the newest quarter
37	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,010,562	0.56%	+719,590	Jun 30, 2026	carried, not yet filed for the newest quarter
37.1	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	719,590	0.40%	—	Jun 30, 2026	College Retirement Equities Fund, not summed
37.2	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	158,719	0.09%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
37.3	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	121,096	0.07%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
37.4	TIAA Separate Account VA-1 - Stock Index Account Fund S000005098 · Registered fund · Jun 30, 2026 TIAA Separate Account VA-1, not summed	2,680	0.00%	0	Jun 30, 2026	TIAA Separate Account VA-1, not summed
37.5	Nuveen Life Stock Index Fund Fund S000005094 · Registered fund · Jun 30, 2026 TIAA-CREF Life Funds, not summed	1,591	0.00%	0	Jun 30, 2026	TIAA-CREF Life Funds, not summed
38	Squarepoint Ops LLC 13F CIK 1642575 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,007,507	0.56%	+957,305	Jun 30, 2026	carried, not yet filed for the newest quarter
39	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,000,938	0.56%	+2,798	Jun 30, 2026	carried, not yet filed for the newest quarter
40	VANGUARD EXPLORER FUND Fund S000002578 · Registered fund · Jul 31, 2026 VANGUARD EXPLORER FUND, not summed	962,801	0.53%	—	Jul 31, 2026	VANGUARD EXPLORER FUND, not summed
41	Blackstone Inc. 13F CIK 1393818 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	899,936	0.50%	-957,912	Jun 30, 2026	carried, not yet filed for the newest quarter
42	FIRST TRUST ADVISORS LP 13F CIK 1125816 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	807,004	0.45%	+807,004	Jun 30, 2026	carried, not yet filed for the newest quarter
43	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	789,399	0.44%	-58,303	Jun 30, 2026	carried, not yet filed for the newest quarter
44	SMALL COMPANY GROWTH PORTFOLIO Fund S000004394 · Registered fund · Jun 30, 2026 VANGUARD VARIABLE INSURANCE FUNDS, not summed	775,001	0.43%	—	Jun 30, 2026	VANGUARD VARIABLE INSURANCE FUNDS, not summed
45	KVP Capital Advisors, LP 13F CIK 1858198 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	771,000	0.43%	+271,000	Jun 30, 2026	carried, not yet filed for the newest quarter
46	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	735,186	0.41%	+374,814	Jun 30, 2026	carried, not yet filed for the newest quarter
47	ROYCE MICRO-CAP TRUST, INC. Fund · Registered fund · Jun 30, 2026 ROYCE MICRO-CAP TRUST, INC., not summed	731,677	0.41%	—	Jun 30, 2026	ROYCE MICRO-CAP TRUST, INC., not summed
48	CITIGROUP INC 13F CIK 831001 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	713,907	0.40%	+115,669	Jun 30, 2026	carried, not yet filed for the newest quarter
49	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	712,763	0.40%	-1,678,570	Jun 30, 2026	carried, not yet filed for the newest quarter
50	Burkehill Global Management, LP 13F CIK 1904549 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	700,000	0.39%	0	Jun 30, 2026	carried, not yet filed for the newest quarter

20 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 294 holders

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Key facts CIK 1738021 CUSIP 20454B104 13F (30d) 10 filings 10 filers Visit website Investor relations