FULC · Fulcrum Therapeutics, Inc. · Shareholders & Ownership

$3.70 -0.02 (-0.54%) At close · Oct 21

Russell 2000 member Rebalance outlook locked

Market Cap

$282.30M

76.30M

Volume · Oct 21 923.78K Avg daily vol (3M) 1.51M

Every disclosed holder of FULC 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 FULC

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)	155	78,900,538	103.41%	Yes
Insiders (Forms 3, 4, 5)	5	6,544,065	8.58%	Yes
13D/G-only blocks	2	6,364,533	8.34%	Yes
Remaining	—	15,511,879	-20.33%	Negative
Registered funds (N-PORT, not summed)	150	11,785,301	15.45%	No

Shares outstanding: 76,297,257, 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 FULC

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	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	8,824,259	11.57%	+3,433,666	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	BlackRock, Inc. 13G CIK 2012383 · Holding company · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	4,802,880	6.30%	+1,532,558	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
1.2	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	1,552,712	2.04%	+113,232	Jun 30, 2026	iShares Trust, not summed
1.3	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	567,824	0.74%	+98,988	Jun 30, 2026	iShares Trust, not summed
1.4	BlackRock Advantage Small Cap Core Fund Fund S000039982 · Registered fund · May 29, 2026 BlackRock Funds, not summed	416,770	0.55%	+295,781	May 29, 2026	BlackRock Funds, not summed
1.5	iShares Biotechnology ETF Fund S000004350 · Registered fund · Jun 30, 2026 iShares Trust, not summed	398,072	0.52%	-31,299	Jun 30, 2026	iShares Trust, not summed
2	TANG CAPITAL MANAGEMENT LLC 13G CIK 1232621 · Unknown · Jul 13, 2026 Rule 13d-1(c), passive investor, not summed	6,913,329	9.06%	+1,461,529	Jul 13, 2026	Rule 13d-1(c), passive investor, not summed
2.1	TANG KEVIN Insider CIK 1178579 · Jul 17, 2026 Director, issuer-wide, not summed	7,080,945	9.28%	+167,616	Jul 17, 2026	Director, issuer-wide, not summed
2.2	TANG CAPITAL MANAGEMENT LLC 13F CIK 1232621 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	6,521,412	8.55%	+6,521,412	Jun 30, 2026	carried, not yet filed for the newest quarter
3	EcoR1 Capital, LLC 13F CIK 1587114 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	6,549,866	8.58%	+6,549,866	Jun 30, 2026	carried, not yet filed for the newest quarter
4	Nantahala Capital Management, LLC 13F CIK 1472322 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	5,475,040	7.18%	+2,425,000	Jun 30, 2026	carried, not yet filed for the newest quarter
4.1	Nantahala Capital Management, LLC 13G CIK 1472322 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	5,475,040	7.18%	+2,425,000	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
5	BlackRock Portfolio Management LLC 13G CIK 2052113 · Holding company · Jun 30, 2026 Rule 13d-1(b), qualified institution	4,021,379	5.27%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution
6	SUVRETTA CAPITAL MANAGEMENT, LLC 13F CIK 1569064 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,680,921	4.82%	-2,880,190	Jun 30, 2026	carried, not yet filed for the newest quarter
6.1	SUVRETTA CAPITAL MANAGEMENT, LLC 13G CIK 1569064 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	3,680,921	4.82%	-1,386,473	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
7	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	3,044,385	3.99%	+1,421,104	Jun 30, 2026	carried, not yet filed for the newest quarter
8	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,704,505	3.54%	+1,412,019	Jun 30, 2026	carried, not yet filed for the newest quarter
9	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,697,216	3.54%	+4,268	Jun 30, 2026	carried, not yet filed for the newest quarter
10	Third Rock Ventures IV, L.P. 13G CIK 1569705 · Unknown · Dec 31, 2023 Rule 13d-1(d), exempt investor	2,343,154	3.07%	—	Dec 31, 2023	Rule 13d-1(d), exempt investor
11	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	2,217,498	2.91%	+1,907,081	Jun 30, 2026	carried, not yet filed for the newest quarter
12	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	2,074,332	2.72%	0	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
13	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	2,037,025	2.67%	+487,174	Jun 30, 2026	carried, not yet filed for the newest quarter
13.1	State Street(R) SPDR(R) S&P(R) Pharmaceuticals ETF Fund S000012321 · Registered fund · Jun 30, 2026 SPDR SERIES TRUST, not summed	807,587	1.06%	+439,870	Jun 30, 2026	SPDR SERIES TRUST, not summed
13.2	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	20,500	0.03%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
13.3	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	1,165	0.00%	0	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
14	ADAGE CAPITAL PARTNERS GP, L.L.C. 13F CIK 1165408 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,000,000	2.62%	+1,600,000	Jun 30, 2026	carried, not yet filed for the newest quarter
15	GSK plc 13F CIK 1131399 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,785,714	2.34%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
16	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,748,467	2.29%	+773,728	Jun 30, 2026	carried, not yet filed for the newest quarter
17	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,647,800	2.16%	+1,634,200	Jun 30, 2026	carried, not yet filed for the newest quarter
18	ADAR1 Capital Management, LLC 13F CIK 1940272 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,565,029	2.05%	+1,434,469	Jun 30, 2026	carried, not yet filed for the newest quarter
19	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,485,803	1.95%	+1,129,332	Jun 30, 2026	carried, not yet filed for the newest quarter
20	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,432,133	1.88%	-54,409	Jun 30, 2026	carried, not yet filed for the newest quarter
21	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,358,423	1.78%	+1,358,423	Jun 30, 2026	carried, not yet filed for the newest quarter
22	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,253,909	1.64%	+938,724	Jun 30, 2026	carried, not yet filed for the newest quarter
23	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,180,946	1.55%	+1,079,610	Jun 30, 2026	carried, not yet filed for the newest quarter
24	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,103,261	1.45%	+560,096	Jun 30, 2026	carried, not yet filed for the newest quarter
24.1	AQR Small Cap Momentum Style Fund Fund S000025644 · Registered fund · Mar 31, 2026 AQR Funds, not summed	12,856	0.02%	—	Mar 31, 2026	AQR Funds, not summed
25	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,094,425	1.43%	+522,516	Jun 30, 2026	carried, not yet filed for the newest quarter
25.1	Goldman Sachs Small Cap Value Insights Fund Fund S000014929 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	62,932	0.08%	+50,813	Jul 31, 2026	Goldman Sachs Trust, not summed
25.2	Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF Fund S000048296 · Registered fund · May 31, 2026 Goldman Sachs ETF Trust, not summed	53,140	0.07%	-9,972	May 31, 2026	Goldman Sachs ETF Trust, not summed
25.3	Goldman Sachs Small Cap Equity Insights Fund Fund S000009329 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	36,906	0.05%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
25.4	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	12,963	0.02%	+1,289	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
26	Ikarian Capital, LLC 13F CIK 1778253 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,049,161	1.38%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
27	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,043,029	1.37%	+916,470	Jun 30, 2026	carried, not yet filed for the newest quarter
27.1	BANK OF AMERICA CORP /DE/ 13G CIK 70858 · Bank · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	4,468,123	5.86%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
28	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,038,797	1.36%	+311,482	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Jump Financial, LLC 13F CIK 1831577 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,005,000	1.32%	+635,195	Jun 30, 2026	carried, not yet filed for the newest quarter
30	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	960,547	1.26%	-169,734	Jun 30, 2026	carried, not yet filed for the newest quarter
30.1	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	168,604	0.22%	-41,533	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
30.2	U.S. SMALL CAP PORTFOLIO Fund S000000971 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	157,099	0.21%	-85,213	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
30.3	Dimensional U.S. Core Equity 2 ETF Fund S000070903 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	93,958	0.12%	+78,610	Jul 31, 2026	Dimensional ETF Trust, not summed
30.4	Dimensional U.S. Small Cap ETF Fund S000070906 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	54,992	0.07%	-164,468	Jul 31, 2026	Dimensional ETF Trust, not summed
30.5	U.S. CORE EQUITY 2 PORTFOLIO Fund S000000980 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	41,663	0.05%	-66,035	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
31	Assenagon Asset Management S.A. 13F CIK 1546007 · Unknown · Sep 30, 2026	835,204	1.09%	0	Sep 30, 2026
32	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	812,766	1.07%	+673,766	Jun 30, 2026	carried, not yet filed for the newest quarter
33	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	782,144	1.03%	+182,765	Jun 30, 2026	carried, not yet filed for the newest quarter
34	Connor, Clark & Lunn Investment Management Ltd. 13F CIK 1596800 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	745,317	0.98%	+8,633	Jun 30, 2026	carried, not yet filed for the newest quarter
35	Balyasny Asset Management L.P. 13F CIK 1218710 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	692,372	0.91%	-1,087,574	Jun 30, 2026	carried, not yet filed for the newest quarter
36	Point72 Asset Management, L.P. 13F CIK 1603466 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	651,427	0.85%	-1,423,428	Jun 30, 2026	carried, not yet filed for the newest quarter
37	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	553,375	0.73%	+4,608	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
38	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	487,869	0.64%	+14,884	Jun 30, 2026	carried, not yet filed for the newest quarter
38.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	26,616	0.03%	-2,881	Jun 30, 2026	Northern Funds, not summed
38.2	Small Cap Core Fund Fund S000001244 · Registered fund · Jun 30, 2026 Northern Funds, not summed	14,333	0.02%	-684	Jun 30, 2026	Northern Funds, not summed
39	Gould Robert J Insider CIK 1577034 · Feb 2, 2026 Director, issuer-wide	454,864	0.60%	-15,000	Feb 2, 2026	Director, issuer-wide
40	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	433,220	0.57%	+6,351	Jun 30, 2026	carried, not yet filed for the newest quarter
40.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	228,499	0.30%	-3,706	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
40.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	141,906	0.19%	+10,460	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
40.3	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	32,522	0.04%	0	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
40.4	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	30,377	0.04%	+479	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
41	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	345,648	0.45%	+15,764	Jun 30, 2026	carried, not yet filed for the newest quarter
42	Hennion & Walsh Asset Management, Inc. 13F CIK 1861642 · Unknown · Sep 30, 2026	336,204	0.44%	+102,353	Sep 30, 2026
43	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	306,585	0.40%	+93,547	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
44	BOOTHBAY FUND MANAGEMENT, LLC 13F CIK 1549230 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	303,988	0.40%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
45	BESSEMER GROUP INC 13F CIK 1054074 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	286,988	0.38%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
46	Peapod Lane Capital LLC 13F CIK 2050979 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	285,798	0.37%	+285,798	Jun 30, 2026	carried, not yet filed for the newest quarter
47	WELLINGTON MANAGEMENT GROUP LLP 13F CIK 902219 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	285,084	0.37%	+166,484	Jun 30, 2026	carried, not yet filed for the newest quarter
48	Engineers Gate Manager LP 13F CIK 1620220 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	242,000	0.32%	+115,891	Jun 30, 2026	carried, not yet filed for the newest quarter
49	EntryPoint Capital, LLC 13F CIK 1992519 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	217,199	0.28%	+171,951	Jun 30, 2026	carried, not yet filed for the newest quarter
50	XTX Topco Ltd 13F CIK 1828301 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	209,247	0.27%	+137,644	Jun 30, 2026	carried, not yet filed for the newest quarter

12 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 236 holders

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Key facts CIK 1680581 CUSIP 359616109 13F (30d) 15 filings 15 filers Visit website Investor relations