CRBU · Caribou Biosciences, Inc. · Shareholders & Ownership

$0.52 +0.06 (+11.85%)

Russell 2000 member Rebalance outlook locked

Market Cap

$49.74M

107.21M

Volume · Oct 20 3.19M Avg daily vol (3M) 2.4M

Every disclosed holder of CRBU 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 CRBU

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

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	140	48,601,227	45.33%	Yes
Insiders (Forms 3, 4, 5)	8	5,167,525	4.82%	Yes
13D/G-only blocks	0	0	0.00%	Yes
Remaining	—	53,438,761	49.85%	Rest
Registered funds (N-PORT, not summed)	87	13,862,018	12.93%	No

Shares outstanding: 107,207,513, the issuer's latest cover-page count restated onto today's split basis.

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 CRBU

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	7,815,843	7.29%	+5,672,758	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	7,176,404	6.69%	+5,332,610	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	2,292,562	2.14%	—	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	881,080	0.82%	—	Jun 30, 2026	iShares Trust, not summed
1.4	iShares Biotechnology ETF Fund S000004350 · Registered fund · Jun 30, 2026 iShares Trust, not summed	628,598	0.59%	+34,114	Jun 30, 2026	iShares Trust, not summed
1.5	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	308,420	0.29%	—	Jun 30, 2026	iShares Trust, not summed
2	Pfizer Inc 13F CIK 78003 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	4,690,431	4.38%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
3	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,208,568	3.93%	+441,340	Jun 30, 2026	carried, not yet filed for the newest quarter
4	Haurwitz Rachel E. Insider CIK 1670579 · Feb 20, 2026 Director, President and CEO, issuer-wide	3,816,545	3.56%	+151,700	Feb 20, 2026	Director, President and CEO, issuer-wide
4.1	Rachel E. Haurwitz 13D CIK 1670579 · Unknown · Apr 22, 2025 not summed	4,716,003	4.40%	—	Apr 22, 2025	not summed
5	MACKENZIE FINANCIAL CORP 13F CIK 919859 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,650,796	3.41%	+2,708,010	Jun 30, 2026	carried, not yet filed for the newest quarter
6	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	3,013,973	2.81%	+284,500	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
7	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,773,545	2.59%	+183,048	Jun 30, 2026	carried, not yet filed for the newest quarter
8	Kynam Capital Management, LP 13F CIK 1907884 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,503,302	2.34%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
9	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,374,894	2.22%	+1,356,935	Jun 30, 2026	carried, not yet filed for the newest quarter
10	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,774,474	1.66%	+849,435	Jun 30, 2026	carried, not yet filed for the newest quarter
11	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,632,914	1.52%	+1,209,651	Jun 30, 2026	carried, not yet filed for the newest quarter
11.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	29,000	0.03%	—	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
11.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	2,318	0.00%	—	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
12	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,410,958	1.32%	+113,791	Jun 30, 2026	carried, not yet filed for the newest quarter
13	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,113,215	1.04%	+188,188	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
14	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,046,279	0.98%	-713,655	Jun 30, 2026	carried, not yet filed for the newest quarter
15	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	975,327	0.91%	+302,127	Jun 30, 2026	carried, not yet filed for the newest quarter
15.1	Dimensional U.S. Small Cap ETF Fund S000070906 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	255,338	0.24%	+38,046	Jul 31, 2026	Dimensional ETF Trust, not summed
15.2	U.S. SMALL CAP PORTFOLIO Fund S000000971 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	170,883	0.16%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
15.3	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	109,650	0.10%	+55,840	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
15.4	Dimensional U.S. Core Equity 2 ETF Fund S000070903 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	74,931	0.07%	-20,956	Jul 31, 2026	Dimensional ETF Trust, not summed
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	775,809	0.72%	+216,167	Jun 30, 2026	carried, not yet filed for the newest quarter
16.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	425,172	0.40%	-6,758	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
16.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	223,613	0.21%	—	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
16.3	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	78,996	0.07%	+958	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
16.4	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	46,922	0.04%	0	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
17	FMR LLC 13F CIK 315066 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	727,115	0.68%	+3,156	Jun 30, 2026	carried, not yet filed for the newest quarter
17.1	Fidelity Small Cap Index Fund Fund S000033638 · Registered fund · Jul 31, 2026 Fidelity Salem Street Trust, not summed	997,353	0.93%	—	Jul 31, 2026	Fidelity Salem Street Trust, not summed
17.2	Fidelity Extended Market Index Fund Fund S000006021 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	450,523	0.42%	+27,626	May 31, 2026	Fidelity Concord Street Trust, not summed
17.3	Fidelity Total Market Index Fund Fund S000006026 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	148,803	0.14%	0	May 31, 2026	Fidelity Concord Street Trust, not summed
17.4	Fidelity Small Cap Value Index Fund Fund S000065751 · Registered fund · Jun 30, 2026 Fidelity Salem Street Trust, not summed	127,774	0.12%	—	Jun 30, 2026	Fidelity Salem Street Trust, not summed
17.5	Fidelity Series Total Market Index Fund Fund S000065248 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	126,991	0.12%	+4,822	May 31, 2026	Fidelity Concord Street Trust, not summed
18	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	712,965	0.67%	+495,230	Jun 30, 2026	carried, not yet filed for the newest quarter
18.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	48,145	0.04%	—	Jun 30, 2026	Northern Funds, not summed
19	MAVERICK CAPITAL LTD 13F CIK 934639 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	652,542	0.61%	0	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	613,801	0.57%	+613,801	Jun 30, 2026	carried, not yet filed for the newest quarter
21	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	606,388	0.57%	+86,270	Jun 30, 2026	carried, not yet filed for the newest quarter
22	Green Alpha Advisors, LLC 13F CIK 1439207 · Registered investment adviser · Sep 30, 2026	551,445	0.51%	+187,121	Sep 30, 2026
23	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	545,755	0.51%	+369,058	Jun 30, 2026	carried, not yet filed for the newest quarter
24	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	517,371	0.48%	+258,202	Jun 30, 2026	carried, not yet filed for the newest quarter
25	MCCLUNG BARBARA G Insider CIK 1231321 · Feb 24, 2026 Chief Legal Officer, issuer-wide	481,564	0.45%	+38,062	Feb 24, 2026	Chief Legal Officer, issuer-wide
26	72 Investment Holdings, LLC 13F CIK 1832749 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	474,067	0.44%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
27	GSA CAPITAL PARTNERS LLP 13F CIK 1362033 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	463,416	0.43%	-17,308	Jun 30, 2026	carried, not yet filed for the newest quarter
28	Kanner Steven Insider CIK 1871131 · Feb 21, 2025 Chief Scientific Officer, issuer-wide	431,556	0.40%	+44,519	Feb 21, 2025	Chief Scientific Officer, issuer-wide
29	JACOBS LEVY EQUITY MANAGEMENT, INC 13F CIK 884414 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	410,979	0.38%	+52,038	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Cambridge Investment Research Advisors, Inc. 13F CIK 1419186 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	382,410	0.36%	-164,604	Jun 30, 2026	carried, not yet filed for the newest quarter
31	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	375,686	0.35%	-829,982	Jun 30, 2026	carried, not yet filed for the newest quarter
32	PFM Health Sciences, LP 13F CIK 1442756 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	354,687	0.33%	-603,100	Jun 30, 2026	carried, not yet filed for the newest quarter
33	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	322,875	0.30%	-53,714	Jun 30, 2026	carried, not yet filed for the newest quarter
33.1	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	72,262	0.07%	+35,772	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
34	Invesco Ltd. 13F CIK 914208 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	301,117	0.28%	+217,615	Jun 30, 2026	carried, not yet filed for the newest quarter
34.1	Invesco RAFI US 1500 Small-Mid ETF Fund S000013120 · Registered fund · Jul 31, 2026 Invesco Exchange-Traded Fund Trust, not summed	82,309	0.08%	+41,642	Jul 31, 2026	Invesco Exchange-Traded Fund Trust, not summed
34.2	Invesco NASDAQ Future Gen 200 ETF Fund S000077288 · Registered fund · May 31, 2026 Invesco Exchange-Traded Fund Trust II, not summed	40,438	0.04%	+6,359	May 31, 2026	Invesco Exchange-Traded Fund Trust II, not summed
34.3	Invesco Nasdaq Biotechnology ETF Fund S000072469 · Registered fund · May 31, 2026 Invesco Exchange-Traded Fund Trust II, not summed	4,925	0.00%	-300	May 31, 2026	Invesco Exchange-Traded Fund Trust II, not summed
35	WELLS FARGO & COMPANY/MN 13F CIK 72971 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	298,315	0.28%	-5,340	Jun 30, 2026	carried, not yet filed for the newest quarter
36	XTX Topco Ltd 13F CIK 1828301 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	269,157	0.25%	-54,312	Jun 30, 2026	carried, not yet filed for the newest quarter
37	Bruce & Co., Inc. 13F CIK 1358331 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	250,000	0.23%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
38	BRUCE FUND Fund S000011411 · Registered fund · Jun 30, 2026 Bruce Fund, Inc., not summed	250,000	0.23%	0	Jun 30, 2026	Bruce Fund, Inc., not summed
39	Man Group plc 13F CIK 1637460 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	240,066	0.22%	+162,856	Jun 30, 2026	carried, not yet filed for the newest quarter
40	Bank of New York Mellon Corp 13F CIK 1390777 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	222,560	0.21%	+210,049	Jun 30, 2026	carried, not yet filed for the newest quarter
41	MILESTONE ASSET MANAGEMENT, LLC 13F CIK 1964722 · Registered investment adviser · Sep 30, 2026	202,703	0.19%	+2,618	Sep 30, 2026
42	AXS Green Alpha ETF Fund S000077398 · Registered fund · Jun 30, 2026 INVESTMENT MANAGERS SERIES TRUST II, not summed	201,851	0.19%	-9,520	Jun 30, 2026	INVESTMENT MANAGERS SERIES TRUST II, not summed
43	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 13F CIK 1705339 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	173,375	0.16%	+84,888	Jun 30, 2026	carried, not yet filed for the newest quarter
43.1	Global X Genomics & Biotechnology ETF Fund S000062676 · Registered fund · May 31, 2026 GLOBAL X FUNDS, not summed	68,184	0.06%	+8,271	May 31, 2026	GLOBAL X FUNDS, not summed
43.2	Global X Russell 2000 ETF Fund S000085029 · Registered fund · Jul 31, 2026 GLOBAL X FUNDS, not summed	43,883	0.04%	—	Jul 31, 2026	GLOBAL X FUNDS, not summed
44	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	165,414	0.15%	-671,489	Jun 30, 2026	carried, not yet filed for the newest quarter
45	Susquehanna Portfolio Strategies, LLC 13F CIK 1996449 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	158,597	0.15%	+158,597	Jun 30, 2026	carried, not yet filed for the newest quarter
46	Graham Capital Management, L.P. 13F CIK 1315421 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	155,914	0.15%	+117,163	Jun 30, 2026	carried, not yet filed for the newest quarter
47	AMERICAN CENTURY COMPANIES INC 13F CIK 748054 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	140,580	0.13%	+28,127	Jun 30, 2026	carried, not yet filed for the newest quarter
48	Avantis U.S. Small Cap Equity ETF Fund S000074835 · Registered fund · May 31, 2026 American Century ETF Trust, not summed	133,553	0.12%	+21,100	May 31, 2026	American Century ETF Trust, not summed
49	BRIDGEWAY CAPITAL MANAGEMENT, LLC 13F CIK 1107261 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	132,000	0.12%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
49.1	Ultra-Small Company Market Fund Fund S000004424 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	113,500	0.11%	0	Jun 30, 2026	Bridgeway Funds, Inc., not summed
50	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	123,516	0.12%	+123,516	Jun 30, 2026	carried, not yet filed for the newest quarter
50.1	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	123,516	0.12%	—	Jul 31, 2026	TIAA-CREF Funds, not summed

10 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 192 holders

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Key facts CIK 1619856 CUSIP 142038108 13F (30d) 15 filings 15 filers Visit website Investor relations