ALEC · Alector, Inc. · Shareholders & Ownership

$2.25 +0.15 (+7.14%) At close · Oct 28 Q2 2025 earnings call transcript

Russell 2000 member Rebalance outlook locked

Market Cap

$251.23M

111.66M

Volume · Oct 28 1.91M Avg daily vol (3M) 3.26M

Every disclosed holder of ALEC 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 ALEC

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)	138	91,164,968	81.65%	Yes
Insiders (Forms 3, 4, 5)	13	8,947,190	8.01%	Yes
13D/G-only blocks	5	44,819,918	40.14%	Yes
Remaining	—	33,275,157	-29.80%	Negative
Registered funds (N-PORT, not summed)	121	15,929,203	14.27%	No

Shares outstanding: 111,656,919, 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 ALEC

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	Deep Track Capital, LP 13G CIK 1856083 · Investment adviser · Oct 16, 2026 Rule 13d-1(c), passive investor	12,772,152	11.44%	—	Oct 16, 2026	Rule 13d-1(c), passive investor
2	TCG Crossover GP II, LLC 13G CIK 1969280 · Unknown · Oct 22, 2025 Rule 13d-1(c), passive investor	10,000,000	8.96%	—	Oct 22, 2025	Rule 13d-1(c), passive investor
3	TCG Crossover Management, LLC 13F CIK 1839948 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	10,000,000	8.96%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
4	BIOTECHNOLOGY VALUE FUND L P 13G CIK 918923 · Unknown · Sep 11, 2026 Rule 13d-1(c), passive investor	9,374,267	8.40%	—	Sep 11, 2026	Rule 13d-1(c), passive investor
5	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	7,847,879	7.03%	+106,634	Jun 30, 2026	carried, not yet filed for the newest quarter
5.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	2,548,224	2.28%	+376,372	Jun 30, 2026	iShares Trust, not summed
5.2	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	820,921	0.74%	+768,039	Jun 30, 2026	iShares Trust, not summed
5.3	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	330,159	0.30%	+101,507	Jun 30, 2026	iShares Trust, not summed
5.4	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	195,896	0.18%	+65,444	Jun 30, 2026	Quantitative Master Series LLC, not summed
5.5	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	161,266	0.14%	-553,187	Jun 30, 2026	iShares Trust, not summed
6	RA CAPITAL MANAGEMENT, L.P. 13G CIK 1346824 · Registered investment adviser · Oct 19, 2026 Rule 13d-1(c), passive investor	7,500,000	6.72%	+7,500,000	Oct 19, 2026	Rule 13d-1(c), passive investor
7	Rosenthal Arnon Insider CIK 1757770 · Oct 14, 2026 Director, Chief Executive Officer, issuer-wide	6,442,475	5.77%	+217,500	Oct 14, 2026	Director, Chief Executive Officer, issuer-wide
7.1	Arnon Rosenthal 13G CIK 1757770 · Unknown · Dec 31, 2025 Rule 13d-1(d), exempt investor, not summed	8,213,925	7.36%	—	Dec 31, 2025	Rule 13d-1(d), exempt investor, not summed
8	Terrance G. McGuire 13G CIK 1493463 · Unknown · Mar 31, 2026 Rule 13d-1(d), exempt investor	5,173,499	4.63%	-1,921,752	Mar 31, 2026	Rule 13d-1(d), exempt investor
9	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	4,414,345	3.95%	+375,560	Jun 30, 2026	carried, not yet filed for the newest quarter
10	Nantahala Capital Management, LLC 13F CIK 1472322 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,318,109	3.87%	+1,502,126	Jun 30, 2026	carried, not yet filed for the newest quarter
11	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,009,340	3.59%	+330,618	Jun 30, 2026	carried, not yet filed for the newest quarter
12	Kynam Capital Management, LP 13F CIK 1907884 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,808,494	3.41%	+1,808,494	Jun 30, 2026	carried, not yet filed for the newest quarter
13	Merck & Co., Inc. 13F CIK 310158 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	3,545,719	3.18%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
14	Balyasny Asset Management L.P. 13F CIK 1218710 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,247,426	2.91%	+312,173	Jun 30, 2026	carried, not yet filed for the newest quarter
15	683 Capital Management, LLC 13F CIK 1404574 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,200,000	2.87%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
16	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	2,959,983	2.65%	-372,852	Jun 30, 2026	carried, not yet filed for the newest quarter
17	ADAR1 Capital Management, LLC 13F CIK 1940272 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,883,583	2.58%	+1,833,583	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	2,837,922	2.54%	+296,600	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
19	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,820,493	2.53%	+236,951	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	2,454,271	2.20%	+168,053	Jun 30, 2026	carried, not yet filed for the newest quarter
21	Spruce Street Capital LP 13F CIK 2050194 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,101,068	1.88%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
22	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,988,835	1.78%	+9,609	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	1,982,606	1.78%	-100,000	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	1,879,765	1.68%	+14,239	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	30,935	0.03%	0	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	2,385	0.00%	0	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
24.3	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	779	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
25	JACOBS LEVY EQUITY MANAGEMENT, INC 13F CIK 884414 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,765,929	1.58%	-388,432	Jun 30, 2026	carried, not yet filed for the newest quarter
26	MEDICI CAPITAL LLC 13F CIK 1777234 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,652,520	1.48%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
27	Affinity Asset Advisors, LLC 13F CIK 1773195 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,510,000	1.35%	+1,010,000	Jun 30, 2026	carried, not yet filed for the newest quarter
28	Eversept Partners, LP 13F CIK 1697013 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,423,873	1.28%	+72,767	Jun 30, 2026	carried, not yet filed for the newest quarter
29	FMR LLC 13F CIK 315066 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,396,398	1.25%	-399,706	Jun 30, 2026	carried, not yet filed for the newest quarter
29.1	Fidelity Small Cap Index Fund Fund S000033638 · Registered fund · Jul 31, 2026 Fidelity Salem Street Trust, not summed	1,067,159	0.96%	+171,276	Jul 31, 2026	Fidelity Salem Street Trust, not summed
29.2	Fidelity Extended Market Index Fund Fund S000006021 · Registered fund · Aug 31, 2026 Fidelity Concord Street Trust, not summed	359,702	0.32%	-124,408	Aug 31, 2026	Fidelity Concord Street Trust, not summed
29.3	Fidelity Total Market Index Fund Fund S000006026 · Registered fund · Aug 31, 2026 Fidelity Concord Street Trust, not summed	162,935	0.15%	-129	Aug 31, 2026	Fidelity Concord Street Trust, not summed
29.4	Fidelity Series Total Market Index Fund Fund S000065248 · Registered fund · Aug 31, 2026 Fidelity Concord Street Trust, not summed	145,263	0.13%	+5,802	Aug 31, 2026	Fidelity Concord Street Trust, not summed
29.5	Fidelity Small Cap Growth Index Fund Fund S000065750 · Registered fund · Jun 30, 2026 Fidelity Salem Street Trust, not summed	81,599	0.07%	+75,753	Jun 30, 2026	Fidelity Salem Street Trust, not summed
30	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,309,577	1.17%	+598,243	Jun 30, 2026	carried, not yet filed for the newest quarter
31	Euclidean Capital LLC 13F CIK 1825034 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,307,858	1.17%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
32	MACKENZIE FINANCIAL CORP 13F CIK 919859 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,109,770	0.99%	+252,416	Jun 30, 2026	carried, not yet filed for the newest quarter
33	DEUTSCHE BANK AG\ 13F CIK 948046 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	1,098,388	0.98%	+5,485	Jun 30, 2026	carried, not yet filed for the newest quarter
33.1	DWS Small Cap Index VIP Fund S000006223 · Registered fund · Jun 30, 2026 DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed	15,330	0.01%	+2,732	Jun 30, 2026	DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed
34	DEERFIELD MANAGEMENT COMPANY, L.P. 13F CIK 1009258 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,055,192	0.95%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
35	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,045,376	0.94%	-233,930	Jun 30, 2026	carried, not yet filed for the newest quarter
36	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,033,776	0.93%	-3,751	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
37	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	935,166	0.84%	-352,525	Jun 30, 2026	carried, not yet filed for the newest quarter
38	DAFNA Capital Management LLC 13F CIK 1389933 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	908,351	0.81%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
39	Elmind Capital, LP 13F CIK 2052213 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	900,000	0.81%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
40	PANAGORA ASSET MANAGEMENT INC 13F CIK 883677 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	845,999	0.76%	+255,611	Jun 30, 2026	carried, not yet filed for the newest quarter
41	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	818,831	0.73%	+31,423	Jun 30, 2026	carried, not yet filed for the newest quarter
41.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	437,637	0.39%	-4,059	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
41.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	239,291	0.21%	+39,365	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
41.3	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	88,843	0.08%	+886	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
41.4	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	50,000	0.04%	0	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
42	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	773,462	0.69%	+81,206	Jun 30, 2026	carried, not yet filed for the newest quarter
42.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	51,120	0.05%	+6,491	Jun 30, 2026	Northern Funds, not summed
43	VANGUARD EXPLORER FUND Fund S000002578 · Registered fund · Jul 31, 2026 VANGUARD EXPLORER FUND, not summed	673,493	0.60%	+78,152	Jul 31, 2026	VANGUARD EXPLORER FUND, not summed
44	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	663,592	0.59%	+85,653	Jun 30, 2026	carried, not yet filed for the newest quarter
45	VANGUARD STRATEGIC SMALL-CAP EQUITY FUND Fund S000012432 · Registered fund · Jun 30, 2026 VANGUARD HORIZON FUNDS, not summed	628,627	0.56%	0	Jun 30, 2026	VANGUARD HORIZON FUNDS, not summed
46	SMALL COMPANY GROWTH PORTFOLIO Fund S000004394 · Registered fund · Jun 30, 2026 VANGUARD VARIABLE INSURANCE FUNDS, not summed	615,923	0.55%	0	Jun 30, 2026	VANGUARD VARIABLE INSURANCE FUNDS, not summed
47	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	598,559	0.54%	-21,865	Jun 30, 2026	carried, not yet filed for the newest quarter
48	BOOTHBAY FUND MANAGEMENT, LLC 13F CIK 1549230 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	532,850	0.48%	-26,876	Jun 30, 2026	carried, not yet filed for the newest quarter
49	Kenkare-Mitra Sara Insider CIK 1895592 · Dec 3, 2025 Director, issuer-wide	501,652	0.45%	-41,687	Dec 3, 2025	Director, issuer-wide
50	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	468,899	0.42%	+72,631	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed

15 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 224 holders

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Key facts CIK 1653087 CUSIP 014442107 13F (30d) 18 filings 16 filers Visit website Investor relations