KROS · Keros Therapeutics, Inc. · Shareholders & Ownership

$10.08 +0.54 (+5.66%) At close · Nov 12

Russell 2000 member Rebalance outlook locked

Market Cap

$197.81M

19.62M

Volume · Nov 12 630.16K Avg daily vol (3M) 187.94K

Every disclosed holder of KROS 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 KROS

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)	137	18,149,706	92.49%	Yes
Insiders (Forms 3, 4, 5)	18	2,158,334	11.00%	Yes
13D/G-only blocks	3	2,928,230	14.92%	Yes
Remaining	—	3,611,896	-18.41%	Negative
Registered funds (N-PORT, not summed)	155	6,113,276	31.15%	No

Shares outstanding: 19,624,374, 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 KROS

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	2,794,217	14.24%	+382,424	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	1,671,343	8.52%	-319,499	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	503,875	2.57%	-213,051	Jun 30, 2026	iShares Trust, not summed
1.3	BlackRock Advantage Small Cap Core Fund Fund S000039982 · Registered fund · Aug 31, 2026 BlackRock Funds, not summed	454,750	2.32%	+234,305	Aug 31, 2026	BlackRock Funds, not summed
1.4	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	174,545	0.89%	-71,490	Jun 30, 2026	iShares Trust, not summed
1.5	iShares Biotechnology ETF Fund S000004350 · Registered fund · Jun 30, 2026 iShares Trust, not summed	128,504	0.65%	-86,285	Jun 30, 2026	iShares Trust, not summed
2	BlackRock Portfolio Management LLC 13G CIK 2052113 · Holding company · Sep 30, 2026 Rule 13d-1(b), qualified institution	1,813,870	9.24%	+690,996	Sep 30, 2026	Rule 13d-1(b), qualified institution
3	Nantahala Capital Management, LLC 13F CIK 1472322 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,410,419	7.19%	+50,000	Jun 30, 2026	carried, not yet filed for the newest quarter
4	ALKEON CAPITAL MANAGEMENT LLC 13G CIK 1230239 · Registered investment adviser · Dec 31, 2024 Rule 13d-1(b), qualified institution	1,101,000	5.61%	-397,907	Dec 31, 2024	Rule 13d-1(b), qualified institution
5	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	967,859	4.93%	+561,296	Jun 30, 2026	carried, not yet filed for the newest quarter
5.1	AQR Small Cap Momentum Style Fund Fund S000025644 · Registered fund · Mar 31, 2026 AQR Funds, not summed	3,448	0.02%	—	Mar 31, 2026	AQR Funds, not summed
6	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	833,596	4.25%	+2,175	Jun 30, 2026	carried, not yet filed for the newest quarter
7	GORDON CARL L Insider CIK 1282930 · Nov 21, 2025 Director, issuer-wide	804,212	4.10%	-219,772	Nov 21, 2025	Director, issuer-wide
8	ORBIMED ADVISORS LLC 13F CIK 1055951 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	759,155	3.87%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
8.1	ORBIMED ADVISORS LLC Insider CIK 1055951 · Nov 21, 2025 10% Owner, issuer-wide, not summed	804,212	4.10%	-214,522	Nov 21, 2025	10% Owner, issuer-wide, not summed
9	MACKENZIE FINANCIAL CORP 13F CIK 919859 · Registered investment adviser · Sep 30, 2026	742,837	3.79%	+114,399	Sep 30, 2026
10	FEDERATED HERMES, INC. 13F CIK 1056288 · Investment adviser · Sep 30, 2026	707,054	3.60%	+6,627	Sep 30, 2026
11	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	652,635	3.33%	-29,408	Jun 30, 2026	carried, not yet filed for the newest quarter
12	Madison Avenue Partners, LP 13F CIK 1801265 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	626,583	3.19%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
13	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	608,837	3.10%	-116,089	Jun 30, 2026	carried, not yet filed for the newest quarter
14	JACOBS LEVY EQUITY MANAGEMENT, INC 13F CIK 884414 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	605,445	3.09%	-100,626	Jun 30, 2026	carried, not yet filed for the newest quarter
15	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	595,316	3.03%	0	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
16	STATE STREET CORP 13F CIK 93751 · Bank · Sep 30, 2026	541,598	2.76%	+405	Sep 30, 2026
16.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	10,090	0.05%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
16.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	314	0.00%	-380	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
16.3	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	77	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
17	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Sep 30, 2026	496,165	2.53%	-14,676	Sep 30, 2026
18	Seehra Jasbir Insider CIK 1732369 · Apr 2, 2026 Director, CHIEF EXECUTIVE OFFICER, issuer-wide	440,708	2.25%	+55,000	Apr 2, 2026	Director, CHIEF EXECUTIVE OFFICER, issuer-wide
19	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Sep 30, 2026	403,603	2.06%	-56,938	Sep 30, 2026
19.1	U.S. SMALL CAP VALUE PORTFOLIO Fund S000000987 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	142,035	0.72%	+29,286	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
19.2	Dimensional US Small Cap Value ETF Fund S000075151 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	86,247	0.44%	+22,793	Jul 31, 2026	Dimensional ETF Trust, not summed
19.3	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	58,103	0.30%	+21,811	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
19.4	Dimensional U.S. Small Cap ETF Fund S000070906 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	49,988	0.25%	-15,260	Jul 31, 2026	Dimensional ETF Trust, not summed
19.5	Dimensional U.S. Core Equity 2 ETF Fund S000070903 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	20,827	0.11%	0	Jul 31, 2026	Dimensional ETF Trust, not summed
20	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	396,098	2.02%	-10,568	Jun 30, 2026	carried, not yet filed for the newest quarter
21	Federated Hermes MDT Small Cap Core Fund Fund S000012972 · Registered fund · Jul 31, 2026 Federated Hermes MDT Series, not summed	382,340	1.95%	0	Jul 31, 2026	Federated Hermes MDT Series, not summed
22	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Sep 30, 2026	346,127	1.76%	-12,959	Sep 30, 2026
23	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	267,460	1.36%	-242,148	Jun 30, 2026	carried, not yet filed for the newest quarter
24	BRIDGEWAY CAPITAL MANAGEMENT, LLC 13F CIK 1107261 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	265,017	1.35%	+70,000	Jun 30, 2026	carried, not yet filed for the newest quarter
24.1	Ultra-Small Company Fund Fund S000004423 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	75,000	0.38%	—	Jun 30, 2026	Bridgeway Funds, Inc., not summed
24.2	Omni Small-Cap Value Fund Fund S000033567 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	39,500	0.20%	-10,000	Jun 30, 2026	Bridgeway Funds, Inc., not summed
24.3	Ultra-Small Company Market Fund Fund S000004424 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	25,000	0.13%	—	Jun 30, 2026	Bridgeway Funds, Inc., not summed
25	Knowles Julius Insider CIK 1808365 · Jun 4, 2026 Director, issuer-wide	263,238	1.34%	-2,625	Jun 4, 2026	Director, issuer-wide
26	VANGUARD STRATEGIC SMALL-CAP EQUITY FUND Fund S000012432 · Registered fund · Jun 30, 2026 VANGUARD HORIZON FUNDS, not summed	258,657	1.32%	+47,695	Jun 30, 2026	VANGUARD HORIZON FUNDS, not summed
27	Nuveen, LLC 13F CIK 1871926 · Unknown · Sep 30, 2026	252,900	1.29%	+5,144	Sep 30, 2026
27.1	Nuveen Quant Small Cap Equity Fund Fund S000005386 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	190,040	0.97%	-3,760	Jul 31, 2026	TIAA-CREF Funds, not summed
27.2	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	26,276	0.13%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
27.3	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	25,147	0.13%	-10,499	Jul 31, 2026	TIAA-CREF Funds, not summed
27.4	Nuveen Life Small Cap Equity Fund Fund S000005093 · Registered fund · Jun 30, 2026 TIAA-CREF Life Funds, not summed	4,049	0.02%	0	Jun 30, 2026	TIAA-CREF Life Funds, not summed
27.5	TIAA Separate Account VA-1 - Stock Index Account Fund S000005098 · Registered fund · Jun 30, 2026 TIAA Separate Account VA-1, not summed	333	0.00%	0	Jun 30, 2026	TIAA Separate Account VA-1, not summed
28	ADAR1 Capital Management, LLC 13F CIK 1940272 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	246,818	1.26%	+149,500	Jun 30, 2026	carried, not yet filed for the newest quarter
29	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	246,649	1.26%	-117,186	Jun 30, 2026	carried, not yet filed for the newest quarter
30	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 13F CIK 1164508 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	233,175	1.19%	-357,074	Jun 30, 2026	carried, not yet filed for the newest quarter
31	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	220,854	1.13%	+3,459	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
32	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	184,822	0.94%	+77,964	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	177,846	0.91%	-46,633	Jun 30, 2026	carried, not yet filed for the newest quarter
33.1	Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF Fund S000048296 · Registered fund · Aug 31, 2026 Goldman Sachs ETF Trust, not summed	22,289	0.11%	-16,530	Aug 31, 2026	Goldman Sachs ETF Trust, not summed
33.2	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Aug 31, 2026 GOLDMAN SACHS TRUST, not summed	5,857	0.03%	-6,378	Aug 31, 2026	GOLDMAN SACHS TRUST, not summed
34	VANGUARD EXPLORER FUND Fund S000002578 · Registered fund · Jul 31, 2026 VANGUARD EXPLORER FUND, not summed	171,150	0.87%	0	Jul 31, 2026	VANGUARD EXPLORER FUND, not summed
35	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	158,712	0.81%	-21,240	Jun 30, 2026	carried, not yet filed for the newest quarter
35.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	92,207	0.47%	-738	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
35.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	45,234	0.23%	-19,616	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
35.3	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	11,035	0.06%	0	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
35.4	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	9,571	0.05%	0	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
36	Man Group plc 13F CIK 1637460 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	155,541	0.79%	-83,077	Jun 30, 2026	carried, not yet filed for the newest quarter
37	WELLS FARGO & COMPANY/MN 13F CIK 72971 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	155,480	0.79%	+4,440	Jun 30, 2026	carried, not yet filed for the newest quarter
38	Kariv Tomer Insider CIK 1568077 · Jun 4, 2025 Director, 10% Owner, issuer-wide	155,262	0.79%	+150,012	Jun 4, 2025	Director, 10% Owner, issuer-wide
39	Nussbaum Ran Insider CIK 1609805 · Jun 4, 2025 Director, 10% Owner, issuer-wide	155,262	0.79%	+150,012	Jun 4, 2025	Director, 10% Owner, issuer-wide
40	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	153,843	0.78%	-100,344	Jun 30, 2026	carried, not yet filed for the newest quarter
40.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	8,164	0.04%	-4,269	Jun 30, 2026	Northern Funds, not summed
41	Bridge Builder Small/Mid Cap Growth Fund Fund S000048336 · Registered fund · Jun 30, 2026 Bridge Builder Trust, not summed	149,300	0.76%	0	Jun 30, 2026	Bridge Builder Trust, not summed
42	Old Westbury Small & Mid Cap Strategies Fund Fund S000001857 · Registered fund · Jul 31, 2026 Old Westbury Funds Inc, not summed	143,853	0.73%	0	Jul 31, 2026	Old Westbury Funds Inc, not summed
43	Empowered Funds, LLC 13F CIK 1592828 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	142,151	0.72%	-3,366	Jun 30, 2026	carried, not yet filed for the newest quarter
43.1	EA Bridgeway Omni Small-Cap Value ETF Fund S000078089 · Registered fund · Jun 30, 2026 EA Series Trust, not summed	125,517	0.64%	-20,000	Jun 30, 2026	EA Series Trust, not summed
44	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	131,314	0.67%	+4,012	Jun 30, 2026	carried, not yet filed for the newest quarter
45	O'SHAUGHNESSY ASSET MANAGEMENT, LLC 13F CIK 1423442 · Registered investment adviser · Sep 30, 2026	126,379	0.64%	0	Sep 30, 2026
46	UBS Group AG 13F CIK 1610520 · Bank · Sep 30, 2026	120,746	0.62%	-17,241	Sep 30, 2026
47	Federated Hermes MDT Small Cap Growth Fund Fund S000012973 · Registered fund · Jul 31, 2026 Federated Hermes MDT Series, not summed	116,178	0.59%	0	Jul 31, 2026	Federated Hermes MDT Series, not summed
48	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · Aug 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	105,661	0.54%	-44,242	Aug 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
49	AMERIPRISE FINANCIAL INC 13F CIK 820027 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	101,342	0.52%	-1,137	Jun 30, 2026	carried, not yet filed for the newest quarter
49.1	Columbia Research Enhanced Small Cap ETF Fund S000095313 · Registered fund · Jun 30, 2026 Columbia ETF Trust I, not summed	21	0.00%	-7	Jun 30, 2026	Columbia ETF Trust I, not summed
50	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Sep 30, 2026	100,593	0.51%	-14,674	Sep 30, 2026

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 242 holders

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Key facts CIK 1664710 CUSIP 492327101 13F (30d) 85 filings 70 filers Visit website Investor relations