CCCC · C4 Therapeutics, Inc. · Shareholders & Ownership

$3.05 +0.16 (+5.36%)

Russell 2000 member Rebalance outlook locked

Market Cap

$355.54M

123.03M

Volume · Oct 20 2.34M Avg daily vol (3M) 2.36M

Every disclosed holder of CCCC 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 CCCC

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)	148	118,516,110	96.33%	Yes
Insiders (Forms 3, 4, 5)	10	3,103,816	2.52%	Yes
13D/G-only blocks	5	40,084,524	32.58%	Yes
Remaining	—	38,679,314	-31.44%	Negative
Registered funds (N-PORT, not summed)	117	20,371,074	16.56%	No

Shares outstanding: 123,025,136, 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 CCCC

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	Sirenia Capital Management LP 13G CIK 2115022 · Registered investment adviser · Mar 31, 2026 Rule 13d-1(b), qualified institution	23,505,000	19.11%	—	Mar 31, 2026	Rule 13d-1(b), qualified institution
2	Lynx1 Capital Management LP 13G CIK 1910456 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(c), passive investor, not summed	15,423,691	12.54%	+12,289,295	Jun 30, 2026	Rule 13d-1(c), passive investor, not summed
2.1	Lynx1 Capital Management LP 13F CIK 1910456 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	7,326,691	5.96%	+327,789	Jun 30, 2026	carried, not yet filed for the newest quarter
3	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	8,867,338	7.21%	-205,062	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	MORGAN STANLEY 13G CIK 895421 · Holding company · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	8,862,002	7.20%	+4,111,619	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
4	RA CAPITAL MANAGEMENT, L.P. 13F CIK 1346824 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	8,000,000	6.50%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
4.1	RA CAPITAL MANAGEMENT, L.P. 13G CIK 1346824 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(c), passive investor, not summed	11,383,696	9.25%	+1,942,440	Jun 30, 2026	Rule 13d-1(c), passive investor, not summed
5	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	7,896,718	6.42%	+5,848,192	Jun 30, 2026	carried, not yet filed for the newest quarter
5.1	BlackRock, Inc. 13G CIK 2012383 · Holding company · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	7,678,906	6.24%	+5,922,293	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
5.2	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	2,595,893	2.11%	—	Jun 30, 2026	iShares Trust, not summed
5.3	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	931,903	0.76%	—	Jun 30, 2026	iShares Trust, not summed
5.4	iShares Biotechnology ETF Fund S000004350 · Registered fund · Jun 30, 2026 iShares Trust, not summed	707,427	0.58%	+98,588	Jun 30, 2026	iShares Trust, not summed
5.5	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	340,711	0.28%	+150,814	Jun 30, 2026	iShares Trust, not summed
6	Squadron Capital Management LLC 13F CIK 2050709 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	7,200,000	5.85%	+4,950,000	Jun 30, 2026	carried, not yet filed for the newest quarter
6.1	Squadron Capital Management LLC 13G CIK 2050709 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	7,600,000	6.18%	+2,050,000	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
7	Bain Capital Life Sciences Investors, LLC 13F CIK 1703031 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	7,171,910	5.83%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
8	Betta Investment (Hong Kong) Limited 13G CIK 1990727 · Unknown · Jan 4, 2024 Rule 13d-1(c), passive investor	5,567,928	4.53%	—	Jan 4, 2024	Rule 13d-1(c), passive investor
9	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	4,747,424	3.86%	+1,524,370	Jun 30, 2026	carried, not yet filed for the newest quarter
10	ORBIMED ADVISORS LLC 13G CIK 1055951 · Registered investment adviser · Mar 31, 2025 Rule 13d-1(b), qualified institution	4,655,600	3.78%	—	Mar 31, 2025	Rule 13d-1(b), qualified institution
11	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,417,731	3.59%	+555,879	Jun 30, 2026	carried, not yet filed for the newest quarter
12	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,187,580	3.40%	+1,676,565	Jun 30, 2026	carried, not yet filed for the newest quarter
13	WASATCH ADVISORS LP 13F CIK 814133 · Registered investment adviser · Sep 30, 2026	4,160,048	3.38%	+637,404	Sep 30, 2026
13.1	Wasatch Ultra Growth Fund Fund S000000879 · Registered fund · Jun 30, 2026 WASATCH FUNDS TRUST, not summed	2,503,777	2.04%	-145,545	Jun 30, 2026	WASATCH FUNDS TRUST, not summed
13.2	Wasatch Micro Cap Fund Fund S000000885 · Registered fund · Jun 30, 2026 WASATCH FUNDS TRUST, not summed	761,872	0.62%	—	Jun 30, 2026	WASATCH FUNDS TRUST, not summed
13.3	Wasatch Long/Short Alpha Fund Fund S000073482 · Registered fund · Jun 30, 2026 WASATCH FUNDS TRUST, not summed	182,566	0.15%	-61,422	Jun 30, 2026	WASATCH FUNDS TRUST, not summed
14	Commodore Capital LP 13G CIK 1831942 · Registered investment adviser · Dec 14, 2023 Rule 13d-1(c), passive investor	3,800,000	3.09%	—	Dec 14, 2023	Rule 13d-1(c), passive investor
15	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	3,530,991	2.87%	+1,143,613	Jun 30, 2026	carried, not yet filed for the newest quarter
15.1	Goldman Sachs Small Cap Equity Insights Fund Fund S000009329 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	90,913	0.07%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
15.2	Goldman Sachs Small Cap Value Insights Fund Fund S000014929 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	74,408	0.06%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
15.3	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	13,209	0.01%	+1,973	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
15.4	Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund Fund S000009355 · Registered fund · Jun 30, 2026 Goldman Sachs Variable Insurance Trust, not summed	13,197	0.01%	—	Jun 30, 2026	Goldman Sachs Variable Insurance Trust, not summed
16	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,469,707	2.82%	+434,073	Jun 30, 2026	carried, not yet filed for the newest quarter
17	Soleus Capital Management, L.P. 13F CIK 1802630 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	3,377,981	2.75%	-425,961	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	3,264,924	2.65%	+372,500	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
19	SILVERARC CAPITAL MANAGEMENT, LLC 13F CIK 1816307 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,032,060	2.46%	+1,120,275	Jun 30, 2026	carried, not yet filed for the newest quarter
20	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	2,656,359	2.16%	+297,118	Jun 30, 2026	carried, not yet filed for the newest quarter
21	Soleus Capital Master Fund, L.P. 13G CIK 1812275 · Unknown · Jan 26, 2024 Rule 13d-1(c), passive investor	2,555,996	2.08%	+720,000	Jan 26, 2024	Rule 13d-1(c), passive investor
22	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,522,163	2.05%	+1,571,120	Jun 30, 2026	carried, not yet filed for the newest quarter
23	Ikarian Capital, LLC 13F CIK 1778253 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,433,000	1.98%	+2,433,000	Jun 30, 2026	carried, not yet filed for the newest quarter
24	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	2,115,621	1.72%	+1,732,648	Jun 30, 2026	carried, not yet filed for the newest quarter
24.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	34,200	0.03%	—	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
24.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	2,559	0.00%	—	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
25	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,806,199	1.47%	-84,715	Jun 30, 2026	carried, not yet filed for the newest quarter
26	Candriam S.C.A. 13F CIK 1537014 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,796,937	1.46%	+1,796,937	Jun 30, 2026	carried, not yet filed for the newest quarter
27	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,740,989	1.42%	+680,658	Jun 30, 2026	carried, not yet filed for the newest quarter
28	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,732,210	1.41%	+445,370	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Patient Square Capital LP 13F CIK 1819257 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,608,815	1.31%	+1,608,815	Jun 30, 2026	carried, not yet filed for the newest quarter
30	HighVista Strategies LLC 13F CIK 1335325 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,348,136	1.10%	+1,348,136	Jun 30, 2026	carried, not yet filed for the newest quarter
31	CONGRESS ASSET MANAGEMENT CO 13F CIK 897378 · Registered investment adviser · Sep 30, 2026	1,256,692	1.02%	+253,255	Sep 30, 2026
32	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,189,828	0.97%	-1,271,987	Jun 30, 2026	carried, not yet filed for the newest quarter
33	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,188,507	0.97%	+745,989	Jun 30, 2026	carried, not yet filed for the newest quarter
33.1	Dimensional U.S. Small Cap ETF Fund S000070906 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	235,215	0.19%	-86,737	Jul 31, 2026	Dimensional ETF Trust, not summed
33.2	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	202,991	0.17%	+96,534	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
33.3	U.S. SMALL CAP PORTFOLIO Fund S000000971 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	155,589	0.13%	+91,360	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
33.4	Dimensional U.S. Core Equity 2 ETF Fund S000070903 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	115,180	0.09%	+93,231	Jul 31, 2026	Dimensional ETF Trust, not summed
33.5	U.S. VECTOR EQUITY PORTFOLIO Fund S000000982 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	43,247	0.04%	+17,137	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
34	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,160,547	0.94%	+971,068	Jun 30, 2026	carried, not yet filed for the newest quarter
34.1	Small Cap Value Fund Fund S000001246 · Registered fund · Jun 30, 2026 Northern Funds, not summed	307,074	0.25%	—	Jun 30, 2026	Northern Funds, not summed
34.2	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	52,537	0.04%	—	Jun 30, 2026	Northern Funds, not summed
34.3	Small Cap Core Fund Fund S000001244 · Registered fund · Jun 30, 2026 Northern Funds, not summed	4,313	0.00%	-327	Jun 30, 2026	Northern Funds, not summed
35	Hirsch Andrew Insider CIK 1586707 · Feb 15, 2026 Chief Financial Officer, issuer-wide	1,074,934	0.87%	+651,789	Feb 15, 2026	Chief Financial Officer, issuer-wide
36	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,047,349	0.85%	+164,416	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
37	FMR LLC 13F CIK 315066 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	894,054	0.73%	+621,686	Jun 30, 2026	carried, not yet filed for the newest quarter
37.1	Fidelity Small Cap Index Fund Fund S000033638 · Registered fund · Jul 31, 2026 Fidelity Salem Street Trust, not summed	1,110,012	0.90%	—	Jul 31, 2026	Fidelity Salem Street Trust, not summed
37.2	Fidelity Enhanced Small Cap Core ETF Fund S000081807 · Registered fund · Jun 30, 2026 Fidelity Covington Trust, not summed	780,673	0.63%	+620,644	Jun 30, 2026	Fidelity Covington Trust, not summed
37.3	Fidelity Extended Market Index Fund Fund S000006021 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	415,948	0.34%	+89,782	May 31, 2026	Fidelity Concord Street Trust, not summed
37.4	Fidelity Total Market Index Fund Fund S000006026 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	154,473	0.13%	0	May 31, 2026	Fidelity Concord Street Trust, not summed
37.5	Fidelity Small Cap Value Index Fund Fund S000065751 · Registered fund · Jun 30, 2026 Fidelity Salem Street Trust, not summed	141,737	0.12%	—	Jun 30, 2026	Fidelity Salem Street Trust, not summed
38	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	828,970	0.67%	+613,093	Jun 30, 2026	carried, not yet filed for the newest quarter
39	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	781,060	0.63%	+328,832	Jun 30, 2026	carried, not yet filed for the newest quarter
39.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	377,039	0.31%	-6,104	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
39.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	246,397	0.20%	—	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
39.3	Schwab Small-Cap Equity Fund Fund S000005516 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	215,096	0.17%	—	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
39.4	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	40,958	0.03%	0	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
39.5	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	27,023	0.02%	0	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
40	BOOTHBAY FUND MANAGEMENT, LLC 13F CIK 1549230 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	736,331	0.60%	+736,331	Jun 30, 2026	carried, not yet filed for the newest quarter
41	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	680,094	0.55%	+680,094	Jun 30, 2026	carried, not yet filed for the newest quarter
42	JNL Multi-Manager Small Cap Value Fund Fund S000001798 · Registered fund · Jun 30, 2026 JNL Series Trust, not summed	633,783	0.52%	+162,157	Jun 30, 2026	JNL Series Trust, not summed
43	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	609,146	0.50%	+125,015	Jun 30, 2026	carried, not yet filed for the newest quarter
44	ExodusPoint Capital Management, LP 13F CIK 1736225 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	580,195	0.47%	+532,688	Jun 30, 2026	carried, not yet filed for the newest quarter
45	Velan Capital Investment Management LP 13F CIK 1848809 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	570,000	0.46%	+570,000	Jun 30, 2026	carried, not yet filed for the newest quarter
46	STEMPOINT CAPITAL LP 13F CIK 1952142 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	523,648	0.43%	+70,412	Jun 30, 2026	carried, not yet filed for the newest quarter
47	Rockefeller Capital Management L.P. 13F CIK 1739439 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	495,817	0.40%	+495,817	Jun 30, 2026	carried, not yet filed for the newest quarter
48	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	484,010	0.39%	+484,010	Jun 30, 2026	carried, not yet filed for the newest quarter
48.1	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	228,720	0.19%	—	Jun 30, 2026	College Retirement Equities Fund, not summed
48.2	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	134,887	0.11%	—	Jul 31, 2026	TIAA-CREF Funds, not summed
48.3	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	89,883	0.07%	—	Jul 31, 2026	TIAA-CREF Funds, not summed
49	WELLS FARGO & COMPANY/MN 13F CIK 72971 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	452,701	0.37%	-415,210	Jun 30, 2026	carried, not yet filed for the newest quarter
50	Man Group plc 13F CIK 1637460 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	408,648	0.33%	+152,180	Jun 30, 2026	carried, not yet filed for the newest quarter

19 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 212 holders

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Key facts CIK 1662579 CUSIP 12529R107 13F (30d) 7 filings 7 filers Visit website Investor relations