CTMX · CytomX Therapeutics, Inc. · Shareholders & Ownership

$2.33 -0.01 (-0.43%)

Russell 2000 member Rebalance outlook locked

Market Cap

$509.88M

217.90M

Volume · Oct 19 2.05M Avg daily vol (3M) 3.32M

Every disclosed holder of CTMX 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 CTMX

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)	180	213,976,713	98.20%	Yes
Insiders (Forms 3, 4, 5)	7	2,198,204	1.01%	Yes
13D/G-only blocks	7	51,040,246	23.42%	Yes
Remaining	—	49,315,879	-22.63%	Negative
Registered funds (N-PORT, not summed)	145	65,326,282	29.98%	No

Shares outstanding: 217,899,284, 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 CTMX

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	FMR LLC 13F CIK 315066 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	32,714,937	15.01%	+759,300	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	Select Health Care Portfolio Fund S000007466 · Registered fund · May 31, 2026 Fidelity Select Portfolios, not summed	5,000,000	2.29%	+1,600,000	May 31, 2026	Fidelity Select Portfolios, not summed
1.2	Fidelity Small Cap Growth Fund Fund S000007193 · Registered fund · Jul 31, 2026 Fidelity Securities Fund, not summed	3,970,290	1.82%	0	Jul 31, 2026	Fidelity Securities Fund, not summed
1.3	Select Biotechnology Portfolio Fund S000007486 · Registered fund · May 31, 2026 Fidelity Select Portfolios, not summed	2,774,340	1.27%	+1,551,800	May 31, 2026	Fidelity Select Portfolios, not summed
1.4	Strategic Advisers Fidelity U.S. Total Stock Fund Fund S000061481 · Registered fund · May 31, 2026 Fidelity Rutland Square Trust II, not summed	2,652,100	1.22%	+2,199,000	May 31, 2026	Fidelity Rutland Square Trust II, not summed
1.5	Fidelity Advisor Health Care Fund Fund S000005329 · Registered fund · Jul 31, 2026 Fidelity Advisor Series VII, not summed	2,500,000	1.15%	0	Jul 31, 2026	Fidelity Advisor Series VII, not summed
2	Kynam Capital Management, LP 13F CIK 1907884 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	21,703,093	9.96%	+6,690,000	Jun 30, 2026	carried, not yet filed for the newest quarter
3	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	17,559,822	8.06%	+12,331,542	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	BlackRock, Inc. 13G CIK 2012383 · Holding company · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	16,551,452	7.60%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
3.2	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	4,607,592	2.11%	—	Jun 30, 2026	iShares Trust, not summed
3.3	iShares Biotechnology ETF Fund S000004350 · Registered fund · Jun 30, 2026 iShares Trust, not summed	1,178,591	0.54%	+191,194	Jun 30, 2026	iShares Trust, not summed
3.4	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	913,054	0.42%	—	Jun 30, 2026	iShares Trust, not summed
3.5	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	759,216	0.35%	—	Jun 30, 2026	iShares Trust, not summed
4	Longitude Capital Partners V, LLC 13G CIK 2018312 · Unknown · Mar 31, 2026 Rule 13d-1(c), passive investor	15,288,461	7.02%	+3,750,000	Mar 31, 2026	Rule 13d-1(c), passive investor
5	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	15,082,617	6.92%	+4,879,832	Jun 30, 2026	carried, not yet filed for the newest quarter
5.1	BANK OF AMERICA CORP /DE/ 13G CIK 70858 · Bank · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	15,134,689	6.95%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
6	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	11,747,236	5.39%	+6,083,828	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	11,747,236	5.39%	—	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	7,964,209	3.66%	+3,453,173	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	55,600	0.03%	—	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
6.4	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	4,493	0.00%	—	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
6.5	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	559	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
7	PERCEPTIVE ADVISORS LLC 13F CIK 1224962 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	10,439,185	4.79%	+340,361	Jun 30, 2026	carried, not yet filed for the newest quarter
8	Venrock Healthcare Capital Partners III, L.P. 13G CIK 1738048 · Unknown · Mar 31, 2026 Rule 13d-1(c), passive investor	9,982,124	4.58%	-3,010,376	Mar 31, 2026	Rule 13d-1(c), passive investor
9	VANGUARD GROUP INC 13G CIK 102909 · Registered investment adviser · Jun 30, 2025 Rule 13d-1(b), qualified institution	9,379,794	4.30%	—	Jun 30, 2025	Rule 13d-1(b), qualified institution
10	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	8,525,457	3.91%	-207,661	Jun 30, 2026	carried, not yet filed for the newest quarter
11	Point72 Asset Management, L.P. 13F CIK 1603466 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	7,811,033	3.58%	-64,357	Jun 30, 2026	carried, not yet filed for the newest quarter
11.1	Point72 Asset Management, L.P. 13G CIK 1603466 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(c), passive investor, not summed	7,811,033	3.58%	-3,053,548	Jun 30, 2026	Rule 13d-1(c), passive investor, not summed
12	TANG CAPITAL MANAGEMENT LLC 13G CIK 1232621 · Unknown · Mar 31, 2025 Rule 13d-1(c), passive investor	6,717,825	3.08%	—	Mar 31, 2025	Rule 13d-1(c), passive investor
13	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	6,230,387	2.86%	-301,400	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
14	BIOTECHNOLOGY VALUE FUND L P 13G CIK 918923 · Unknown · Jul 3, 2025 Rule 13d-1(c), passive investor	5,769,231	2.65%	-5,769,231	Jul 3, 2025	Rule 13d-1(c), passive investor
15	WELLINGTON MANAGEMENT GROUP LLP 13F CIK 902219 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	5,168,961	2.37%	+1,585,976	Jun 30, 2026	carried, not yet filed for the newest quarter
16	Venrock Adviser, LLC 13F CIK 1615982 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,982,124	2.29%	-5,000,000	Jun 30, 2026	carried, not yet filed for the newest quarter
17	BAKER BROS. ADVISORS LP 13F CIK 1263508 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,975,826	2.28%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
18	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,678,716	2.15%	+2,612,104	Jun 30, 2026	carried, not yet filed for the newest quarter
19	Elmind Capital, LP 13F CIK 2052213 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,550,000	2.09%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
20	Nextech Invest, Ltd. 13F CIK 1595430 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,449,932	2.04%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
21	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,132,643	1.90%	+1,422,487	Jun 30, 2026	carried, not yet filed for the newest quarter
22	Eversept Partners, LP 13F CIK 1697013 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,558,497	1.63%	+369,983	Jun 30, 2026	carried, not yet filed for the newest quarter
23	ORBIMED ADVISORS LLC 13G CIK 1055951 · Registered investment adviser · Dec 31, 2025 Rule 13d-1(c), passive investor	3,525,650	1.62%	-4,935,850	Dec 31, 2025	Rule 13d-1(c), passive investor
24	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	3,468,359	1.59%	+348,204	Jun 30, 2026	carried, not yet filed for the newest quarter
25	Siren, L.L.C. 13F CIK 2005245 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	3,457,711	1.59%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
26	ADAR1 Capital Management, LLC 13F CIK 1940272 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,365,118	1.54%	-45,072	Jun 30, 2026	carried, not yet filed for the newest quarter
27	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,110,509	1.43%	-2,295,684	Jun 30, 2026	carried, not yet filed for the newest quarter
28	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,024,351	1.39%	-1,113,825	Jun 30, 2026	carried, not yet filed for the newest quarter
29	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	2,096,625	0.96%	+103,721	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
30	Woodline Partners LP 13F CIK 1784547 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,040,210	0.94%	+39,385	Jun 30, 2026	carried, not yet filed for the newest quarter
31	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	2,003,652	0.92%	+543,813	Jun 30, 2026	carried, not yet filed for the newest quarter
31.1	Goldman Sachs Small Cap Equity Insights Fund Fund S000009329 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	158,271	0.07%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
31.2	Goldman Sachs Small Cap Growth Insights Fund Fund S000014930 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	43,752	0.02%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
31.3	Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund Fund S000009355 · Registered fund · Jun 30, 2026 Goldman Sachs Variable Insurance Trust, not summed	37,629	0.02%	—	Jun 30, 2026	Goldman Sachs Variable Insurance Trust, not summed
31.4	Multi-Manager U.S. Small Cap Equity Fund Fund S000051363 · Registered fund · Apr 30, 2026 Goldman Sachs Trust II, not summed	23,675	0.01%	—	Apr 30, 2026	Goldman Sachs Trust II, not summed
31.5	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	13,618	0.01%	-1,568	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
32	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,860,290	0.85%	-70,630	Jun 30, 2026	carried, not yet filed for the newest quarter
32.1	U.S. CORE EQUITY 2 PORTFOLIO Fund S000000980 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	208,397	0.10%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
32.2	U.S. Small Cap Growth Portfolio Fund S000039439 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	152,903	0.07%	-20,798	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
32.3	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	135,648	0.06%	-48,553	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
32.4	Dimensional U.S. Small Cap ETF Fund S000070906 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	124,826	0.06%	-172,495	Jul 31, 2026	Dimensional ETF Trust, not summed
32.5	Dimensional U.S. Core Equity 2 ETF Fund S000070903 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	71,243	0.03%	0	Jul 31, 2026	Dimensional ETF Trust, not summed
33	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,824,564	0.84%	-425,019	Jun 30, 2026	carried, not yet filed for the newest quarter
34	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,751,167	0.80%	+956,412	Jun 30, 2026	carried, not yet filed for the newest quarter
35	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,685,830	0.77%	-1,974,360	Jun 30, 2026	carried, not yet filed for the newest quarter
36	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,675,183	0.77%	+1,063,042	Jun 30, 2026	carried, not yet filed for the newest quarter
37	TUDOR INVESTMENT CORP ET AL 13F CIK 923093 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,380,687	0.63%	+1,380,687	Jun 30, 2026	carried, not yet filed for the newest quarter
38	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,267,430	0.58%	+164,547	Jun 30, 2026	carried, not yet filed for the newest quarter
39	Assenagon Asset Management S.A. 13F CIK 1546007 · Unknown · Sep 30, 2026	1,181,259	0.54%	+817,086	Sep 30, 2026
40	McCarthy Sean A. Insider CIK 1654058 · Mar 17, 2026 Director, CEO, issuer-wide	1,172,080	0.54%	-118,969	Mar 17, 2026	Director, CEO, issuer-wide
41	Seven Fleet Capital Management LP 13F CIK 2092021 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,085,398	0.50%	+714,000	Jun 30, 2026	carried, not yet filed for the newest quarter
42	SPHERA FUNDS MANAGEMENT LTD. 13F CIK 1496201 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	879,000	0.40%	+659,000	Jun 30, 2026	carried, not yet filed for the newest quarter
43	Ally Bridge Group (NY) LLC 13F CIK 1822947 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	775,000	0.36%	-125,000	Jun 30, 2026	carried, not yet filed for the newest quarter
44	DV EQUITIES, LLC 13F CIK 1841659 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	714,000	0.33%	—	Jun 30, 2026	carried, not yet filed for the newest quarter
45	GILDER GAGNON HOWE & CO LLC 13F CIK 902464 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	704,423	0.32%	-415,886	Jun 30, 2026	carried, not yet filed for the newest quarter
46	Bank of New York Mellon Corp 13F CIK 1390777 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	684,539	0.31%	+394,671	Jun 30, 2026	carried, not yet filed for the newest quarter
47	DEUTSCHE BANK AG\ 13F CIK 948046 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	663,038	0.30%	+199,617	Jun 30, 2026	carried, not yet filed for the newest quarter
47.1	DWS Small Cap Index VIP Fund S000006223 · Registered fund · Jun 30, 2026 DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed	27,936	0.01%	—	Jun 30, 2026	DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed
48	FIRST TRUST ADVISORS LP 13F CIK 1125816 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	599,696	0.28%	+31,134	Jun 30, 2026	carried, not yet filed for the newest quarter
48.1	First Trust Dow Jones Select MicroCap Index Fund Fund S000010772 · Registered fund · Jun 30, 2026 First Trust Exchange-Traded Fund, not summed	599,696	0.28%	+31,134	Jun 30, 2026	First Trust Exchange-Traded Fund, not summed
49	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	549,875	0.25%	+421,079	Jun 30, 2026	carried, not yet filed for the newest quarter
50	Ensign Peak Advisors, Inc 13F CIK 1454984 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	505,055	0.23%	-87,418	Jun 30, 2026	carried, not yet filed for the newest quarter

46 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 246 holders

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Key facts CIK 1501989 CUSIP 23284F105 13F (30d) 9 filings 9 filers Visit website Investor relations