ANRO · Alto Neuroscience, Inc. · Shareholders & Ownership

$21.97 -0.23 (-1.04%) At close · Oct 23

Russell 2000 member Rebalance outlook locked

Market Cap

$862.15M

39.24M

Volume · Oct 23 379.26K Avg daily vol (3M) 554.74K

Every disclosed holder of ANRO 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 ANRO

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)	117	29,471,318	75.10%	Yes
Insiders (Forms 3, 4, 5)	2	913,009	2.33%	Yes
13D/G-only blocks	3	5,240,563	13.35%	Yes
Remaining	—	3,617,214	9.22%	Rest
Registered funds (N-PORT, not summed)	104	4,656,067	11.87%	No

Shares outstanding: 39,242,104, 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 ANRO

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	Alpha Wave Global, LP 13F CIK 1558858 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,707,757	9.45%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
2	Commodore Capital LP 13F CIK 1831942 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,723,196	6.94%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
3	EcoR1 Capital, LLC 13G CIK 1587114 · Registered investment adviser · Jul 13, 2026 Rule 13d-1(b), qualified institution	2,232,000	5.69%	—	Jul 13, 2026	Rule 13d-1(b), qualified institution
4	Sirenia Capital Management LP 13G CIK 2115022 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution	2,219,568	5.66%	-372,019	Jun 30, 2026	Rule 13d-1(b), qualified institution
5	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	2,121,009	5.40%	+1,454,821	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	2,104,406	5.36%	+1,543,043	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	663,352	1.69%	—	Jun 30, 2026	iShares Trust, not summed
5.3	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	240,404	0.61%	—	Jun 30, 2026	iShares Trust, not summed
5.4	iShares Biotechnology ETF Fund S000004350 · Registered fund · Jun 30, 2026 iShares Trust, not summed	221,513	0.56%	+8,836	Jun 30, 2026	iShares Trust, not summed
5.5	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	88,048	0.22%	+29,504	Jun 30, 2026	iShares Trust, not summed
6	PERCEPTIVE ADVISORS LLC 13F CIK 1224962 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,609,893	4.10%	-400,000	Jun 30, 2026	carried, not yet filed for the newest quarter
6.1	PERCEPTIVE ADVISORS LLC 13G CIK 1224962 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(c), passive investor, not summed	4,176,711	10.64%	+926,777	Jun 30, 2026	Rule 13d-1(c), passive investor, not summed
7	ADAGE CAPITAL PARTNERS GP, L.L.C. 13F CIK 1165408 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,600,000	4.08%	+1,215,000	Jun 30, 2026	carried, not yet filed for the newest quarter
8	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,389,477	3.54%	+182,452	Jun 30, 2026	carried, not yet filed for the newest quarter
9	Spruce Street Capital LP 13F CIK 2050194 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,353,047	3.45%	+27,837	Jun 30, 2026	carried, not yet filed for the newest quarter
10	Vivo Capital, LLC 13F CIK 1674712 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,208,858	3.08%	+173,307	Jun 30, 2026	carried, not yet filed for the newest quarter
11	FRANKLIN RESOURCES INC 13F CIK 38777 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,013,307	2.58%	-88,567	Jun 30, 2026	carried, not yet filed for the newest quarter
11.1	Franklin Biotechnology Discovery Fund Fund S000006882 · Registered fund · Jul 31, 2026 Franklin Strategic Series, not summed	347,904	0.89%	-57,371	Jul 31, 2026	Franklin Strategic Series, not summed
12	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,011,881	2.58%	+136,100	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
13	ARMISTICE CAPITAL, LLC 13F CIK 1601086 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	864,000	2.20%	-48,000	Jun 30, 2026	carried, not yet filed for the newest quarter
14	Affinity Asset Advisors, LLC 13F CIK 1773195 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	850,000	2.17%	+350,000	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Etkin Amit Insider CIK 2007795 · May 14, 2026 Director, PRESIDENT AND CEO, issuer-wide	833,949	2.13%	-400,000	May 14, 2026	Director, PRESIDENT AND CEO, issuer-wide
15.1	Amit Etkin 13G CIK 2007795 · Unknown · Sep 30, 2024 Rule 13d-1(d), exempt investor, not summed	1,461,130	3.72%	—	Sep 30, 2024	Rule 13d-1(d), exempt investor, not summed
16	K2 HealthVentures Equity Trust LLC 13G CIK 1948604 · Unknown · Dec 31, 2025 Rule 13d-1(c), passive investor	788,995	2.01%	-828,860	Dec 31, 2025	Rule 13d-1(c), passive investor
17	Vestal Point Capital, LP 13F CIK 1974915 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	785,000	2.00%	-1,279,075	Jun 30, 2026	carried, not yet filed for the newest quarter
17.1	Vestal Point Capital, LP 13G CIK 1974915 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	785,000	2.00%	-1,279,075	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
18	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	685,945	1.75%	+486,442	Jun 30, 2026	carried, not yet filed for the newest quarter
18.1	State Street(R) SPDR(R) S&P(R) Pharmaceuticals ETF Fund S000012321 · Registered fund · Jun 30, 2026 SPDR SERIES TRUST, not summed	190,203	0.48%	+116,915	Jun 30, 2026	SPDR SERIES TRUST, not summed
18.2	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	8,500	0.02%	—	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
18.3	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	661	0.00%	—	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
18.4	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	190	0.00%	—	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
19	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	678,199	1.73%	+385,300	Jun 30, 2026	carried, not yet filed for the newest quarter
20	72 Investment Holdings, LLC 13F CIK 1832749 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	667,778	1.70%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
21	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	632,701	1.61%	+159,298	Jun 30, 2026	carried, not yet filed for the newest quarter
21.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	13,206	0.03%	—	Jun 30, 2026	Northern Funds, not summed
21.2	Small Cap Core Fund Fund S000001244 · Registered fund · Jun 30, 2026 Northern Funds, not summed	6,468	0.02%	-277	Jun 30, 2026	Northern Funds, not summed
22	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	558,320	1.42%	-263,662	Jun 30, 2026	carried, not yet filed for the newest quarter
23	Point72 Asset Management, L.P. 13F CIK 1603466 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	502,950	1.28%	-137	Jun 30, 2026	carried, not yet filed for the newest quarter
24	Integral Health Asset Management, LLC 13F CIK 1773206 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	500,000	1.27%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
25	Venrock Adviser, LLC 13F CIK 1615982 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	500,000	1.27%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
26	Driehaus Capital Management LLC 13F CIK 938206 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	487,576	1.24%	+850	Jun 30, 2026	carried, not yet filed for the newest quarter
27	Parkman Healthcare Partners LLC 13F CIK 1777015 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	429,035	1.09%	+429,035	Jun 30, 2026	carried, not yet filed for the newest quarter
28	Ikarian Capital, LLC 13F CIK 1778253 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	407,338	1.04%	-107,662	Jun 30, 2026	carried, not yet filed for the newest quarter
29	PRICE T ROWE ASSOCIATES INC /MD/ 13F CIK 80255 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	358,279	0.91%	-12,929	Jun 30, 2026	carried, not yet filed for the newest quarter
29.1	T. Rowe Price Health Sciences Fund, Inc. Fund S000002088 · Registered fund · Jun 30, 2026 T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed	228,057	0.58%	-40,223	Jun 30, 2026	T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed
29.2	T. Rowe Price Health Sciences Portfolio Fund S000002083 · Registered fund · Jun 30, 2026 T. ROWE PRICE EQUITY SERIES, INC., not summed	16,400	0.04%	0	Jun 30, 2026	T. ROWE PRICE EQUITY SERIES, INC., not summed
29.3	T. Rowe Price Extended Equity Market Index Fund Fund S000002090 · Registered fund · Jun 30, 2026 T. ROWE PRICE INDEX TRUST, INC., not summed	12,046	0.03%	0	Jun 30, 2026	T. ROWE PRICE INDEX TRUST, INC., not summed
29.4	T. Rowe Price Small-Cap Index Fund Fund S000051327 · Registered fund · Jun 30, 2026 T. ROWE PRICE INDEX TRUST, INC., not summed	3,995	0.01%	—	Jun 30, 2026	T. ROWE PRICE INDEX TRUST, INC., not summed
30	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	346,618	0.88%	+44,295	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
31	ORBIMED ADVISORS LLC 13F CIK 1055951 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	257,852	0.66%	+90,352	Jun 30, 2026	carried, not yet filed for the newest quarter
32	Schonfeld Strategic Advisors LLC 13F CIK 1665241 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	257,631	0.66%	+257,631	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	236,830	0.60%	+132,113	Jun 30, 2026	carried, not yet filed for the newest quarter
33.1	Goldman Sachs Small Cap Growth Insights Fund Fund S000014930 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	8,336	0.02%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
33.2	Goldman Sachs Small Cap Equity Insights Fund Fund S000009329 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	5,708	0.01%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
33.3	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Aug 31, 2026 GOLDMAN SACHS TRUST, not summed	2,919	0.01%	-2,334	Aug 31, 2026	GOLDMAN SACHS TRUST, not summed
34	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	225,503	0.57%	+49,156	Jun 30, 2026	carried, not yet filed for the newest quarter
35	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	211,257	0.54%	+45,985	Jun 30, 2026	carried, not yet filed for the newest quarter
36	AMERIPRISE FINANCIAL INC 13F CIK 820027 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	190,996	0.49%	+177,672	Jun 30, 2026	carried, not yet filed for the newest quarter
36.1	Columbia Research Enhanced Small Cap ETF Fund S000095313 · Registered fund · Jun 30, 2026 Columbia ETF Trust I, not summed	54	0.00%	—	Jun 30, 2026	Columbia ETF Trust I, not summed
37	Saturn V Capital Management LP 13F CIK 1964437 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	182,829	0.47%	+93,830	Jun 30, 2026	carried, not yet filed for the newest quarter
38	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	181,101	0.46%	+181,101	Jun 30, 2026	carried, not yet filed for the newest quarter
39	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	147,299	0.38%	-68,800	Jun 30, 2026	carried, not yet filed for the newest quarter
40	Eversept Partners, LP 13F CIK 1697013 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	128,286	0.33%	+3,118	Jun 30, 2026	carried, not yet filed for the newest quarter
41	BOOTHBAY FUND MANAGEMENT, LLC 13F CIK 1549230 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	106,234	0.27%	-33,070	Jun 30, 2026	carried, not yet filed for the newest quarter
42	ALKEON CAPITAL MANAGEMENT LLC 13F CIK 1230239 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	102,101	0.26%	-125,000	Jun 30, 2026	carried, not yet filed for the newest quarter
43	STIFEL FINANCIAL CORP 13F CIK 720672 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	85,480	0.22%	-855	Jun 30, 2026	carried, not yet filed for the newest quarter
44	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	80,583	0.21%	+63,565	Jun 30, 2026	carried, not yet filed for the newest quarter
44.1	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	63,570	0.16%	—	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
44.2	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	16,417	0.04%	0	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
45	AWM Investment Company, Inc. 13F CIK 1535264 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	80,000	0.20%	-90,000	Jun 30, 2026	carried, not yet filed for the newest quarter
46	Smith Nicholas Conrad Insider CIK 2009130 · Oct 2, 2026 CHIEF FINANCIAL OFFICER & CBO, issuer-wide	79,060	0.20%	+55,000	Oct 2, 2026	CHIEF FINANCIAL OFFICER & CBO, issuer-wide
47	Bank of New York Mellon Corp 13F CIK 1390777 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	76,330	0.19%	+76,330	Jun 30, 2026	carried, not yet filed for the newest quarter
48	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	74,940	0.19%	+6,286	Jun 30, 2026	carried, not yet filed for the newest quarter
49	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	71,399	0.18%	-32,100	Jun 30, 2026	carried, not yet filed for the newest quarter
50	WELLINGTON MANAGEMENT GROUP LLP 13F CIK 902219 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	70,913	0.18%	+11,114	Jun 30, 2026	carried, not yet filed for the newest quarter

9 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 167 holders

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Key facts CIK 1999480 CUSIP 02157Q109 13F (30d) 10 filings 10 filers Visit website Investor relations