ALEC · Alector, Inc. · Holdings

$2.14 +0.00 (+0.00%) At close · Sep 11

Russell 2000 member Rebalance outlook locked

Market Cap

$238.95M

111.66M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 141

Total Value: $185,157,157

Total Shares: 92,118,031

Showing 1–100 of 145 holdings by value · page 1 of 2

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 141 13F filers · Δ vs Mar 31, 2026

Top Holder

10.9%

−0.4 pts

Top 5

33.2%

+0.1 pts

Top 10

51.9%

+1.0 pts

HHI

402

Broadly held+0

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +3

Institutional value: -2.8%

Shares held: +3.9%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mid ADAR1 Capital Management, LLC	+1,833,583	2,883,583
Mid Kynam Capital Management, LP	+1,808,494	3,808,494
Mid Nantahala Capital Management, LLC	+1,502,126	4,318,109
Mid Affinity Asset Advisors, LLC	+1,010,000	1,510,000
Large Balyasny Asset Management L.P.	+816,073	3,751,326

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega FMR LLC	−399,706	1,396,398
Large JACOBS LEVY EQUITY MANAGEMENT, INC	−388,432	1,765,929
Mega D. E. Shaw & Co., Inc.	−372,852	2,959,983
Large RENAISSANCE TECHNOLOGIES LLC	−352,525	935,166
Mega JANE STREET GROUP, LLC	−311,164	120,100

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mid CANTOR FITZGERALD, L. P.	295,492	$593,938
Large LMR Partners LLP	200,000	$402,000
Mid Graham Capital Management, L.P.	46,496	$93,456
Large MERCER GLOBAL ADVISORS INC /ADV	25,504	$51,263
Mid GROUP ONE TRADING LLC	25,208	$50,668

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Small Foresite Capital Management IV, LLC	3,887,200	$8,357,480
Small Odyssean, LLC	89,783	$193,033
Mid GSA CAPITAL PARTNERS LLP	78,207	$168,145
Large CWM, LLC	28,985	$62,317
Small State of Wyoming	1,645	$3,536

Filter: New 13 Increased 59 Reduced 36 Sold out 10 Unchanged 33

Showing 100 of 145

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

TCG Crossover Management, LLC

$20,100,000

10.86%

10,000,000

BlackRock, Inc.

$15,774,232

8.52%

7,847,879

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	469,149	$942,989	6.0%	Sole
BlackRock Asset Management Canada Ltd	846	$1,700	0.0%	Sole
BlackRock Investment Management, LLC	295,587	$594,129	3.8%	Sole
BLACKROCK ADVISORS LLC	242,278	$486,978	3.1%	Sole
BlackRock Fund Advisors	3,919,590	$7,878,375	49.9%	Sole
BlackRock Institutional Trust Company, N.A.	2,905,617	$5,840,290	37.0%	Sole
BlackRock Japan Co. Ltd	9,725	$19,547	0.1%	Sole
BlackRock (Netherlands) B.V.	4,325	$8,693	0.1%	Sole
Aperio Group, LLC	762	$1,531	0.0%	Sole

ACADIAN ASSET MANAGEMENT LLC

$8,872,833

4.79%

4,414,345

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	4,414,345	$8,872,833	100.0%	Defined

Nantahala Capital Management, LLC

$8,679,399

4.69%

4,318,109

VANGUARD CAPITAL MANAGEMENT LLC

$8,058,773

4.35%

4,009,340

Kynam Capital Management, LP

$7,655,072

4.13%

3,808,494

Merck & Co., Inc.

$7,126,895

3.85%

3,545,719

Balyasny Asset Management L.P.

$6,527,326

3.53%

3,247,426

683 Capital Management, LLC

$6,432,000

3.47%

3,200,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
683 Capital Partners, LP	3,200,000	$6,432,000	100.0%	Defined

D. E. Shaw & Co., Inc.

$5,949,565

3.21%

2,959,983

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	2,454,675	$4,933,896	82.9%	Defined
D. E. Shaw Investment Management, L.L.C. joint	505,308	$1,015,669	17.1%	Defined

ADAR1 Capital Management, LLC

$5,796,001

3.13%

2,883,583

VANGUARD PORTFOLIO MANAGEMENT LLC

$5,669,190

3.06%

2,820,493

GEODE CAPITAL MANAGEMENT, LLC

$4,933,084

2.66%

2,454,271

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	353,618	$710,772	14.4%	Defined
Held directly	2,100,653	$4,222,312	85.6%	Defined

Spruce Street Capital LP

$4,223,146

2.28%

2,101,068

MILLENNIUM MANAGEMENT LLC

$3,997,558

2.16%

1,988,835

Ikarian Capital, LLC

$3,985,038

2.15%

1,982,606

STATE STREET CORP

$3,778,327

2.04%

1,879,765

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS EUROPE LIMITED joint	1,879,765	$3,778,327	100.0%	Defined

JACOBS LEVY EQUITY MANAGEMENT, INC

$3,549,517

1.92%

1,765,929

MEDICI CAPITAL LLC

$3,321,565

1.79%

1,652,520

Affinity Asset Advisors, LLC

$3,035,100

1.64%

1,510,000

Eversept Partners, LP

$2,861,984

1.55%

1,423,873

FMR LLC

$2,806,759

1.52%

1,396,398

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	1,396,028	$2,806,016	100.0%	Defined
STRATEGIC ADVISERS LLC	370	$743	0.0%	Defined

AQR CAPITAL MANAGEMENT LLC

$2,632,247

1.42%

1,309,577

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RF&L WEALTH MANAGEMENT, LLC	47	$94	0.0%	Other
Compound Planning, Inc.	22	$44	0.0%	Other
Arax Advisory Partners	5,096	$10,242	0.4%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	4,687	$9,420	0.4%	Other
Stokes Family Office, LLC	3,420	$6,874	0.3%	Other
Held directly	1,296,305	$2,605,573	99.0%	Defined

Euclidean Capital LLC

$2,628,794

1.42%

1,307,858

MACKENZIE FINANCIAL CORP

$2,230,637

1.20%

1,109,770

DEUTSCHE BANK AG\

$2,207,759

1.19%

1,098,388

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS INVESTMENT MANAGEMENT AMERICAS, INC	1,730	$3,477	0.2%	Defined
DWS Investments UK Ltd	1,096,658	$2,204,282	99.8%	Defined

DEERFIELD MANAGEMENT COMPANY, L.P.

$2,120,935

1.15%

1,055,192

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Deerfield UGP, LLC	1,055,192	$2,120,935	100.0%	Defined

TWO SIGMA INVESTMENTS, LP

$2,101,205

1.13%

1,045,376

RENAISSANCE TECHNOLOGIES LLC

$1,879,683

1.02%

935,166

DAFNA Capital Management LLC

$1,825,785

0.99%

908,351

Elmind Capital, LP

$1,809,000

0.98%

900,000

PANAGORA ASSET MANAGEMENT INC

$1,700,457

0.92%

845,999

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$1,645,850

0.89%

818,831

NORTHERN TRUST CORP

$1,554,657

0.84%

773,462

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	758,132	$1,523,844	98.0%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	15,330	$30,813	2.0%	Other

VANGUARD FIDUCIARY TRUST CO

$1,333,819

0.72%

663,592

MARSHALL WACE, LLP

$1,203,102

0.65%

598,559

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	598,559	$1,203,102	100.0%	Other

BOOTHBAY FUND MANAGEMENT, LLC

$1,071,028

0.58%

532,850

Balyasny Asset Management L.P.

$1,012,839

0.55%

503,900

GOLDMAN SACHS GROUP INC

$872,088

0.47%

433,875

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	274,318	$551,379	63.2%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	159,557	$320,709	36.8%	Defined

XTX Topco Ltd

$803,358

0.43%

399,681

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	399,681	$803,358	100.0%	Defined

CITADEL ADVISORS LLC

$786,376

0.42%

391,232

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	71,306	$143,325	18.2%	Defined
Held directly	319,926	$643,051	81.8%	Defined

CANTOR FITZGERALD, L. P.

$593,938

0.32%

295,492

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Cantor Fitzgerald & Co.	295,492	$593,938	100.0%	Defined

UBS Group AG

$550,297

0.30%

273,780

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	273,780	$550,297	100.0%	Defined

Invesco Ltd.

$516,847

0.28%

257,139

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invesco Advisers, Inc. joint	14,074	$28,288	5.5%	Defined
Invesco Trust Co joint	38,786	$77,959	15.1%	Defined
Invesco Capital Management LLC	204,279	$410,600	79.4%	Defined

Bank of New York Mellon Corp

$502,686

0.27%

250,093

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	81,174	$163,159	32.5%	Defined
The Bank of New York Mellon	168,918	$339,525	67.5%	Defined
Held directly	1	$2	0.0%	Defined

AMERIPRISE FINANCIAL INC

$451,305

0.24%

224,530

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Columbia Management Investment Advisers, LLC	224,530	$451,305	100.0%	Defined

LMR Partners LLP

$402,000

0.22%

200,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
LMR Partners LLC	200,000	$402,000	100.0%	Sole

NANO CAP NEW MILLENNIUM GROWTH FUND L P

$402,000

0.22%

200,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
AZG TANGIBLE ASSETS FUND LLC	200,000	$402,000	100.0%	Sole

Nuveen, LLC

$354,230

0.19%

176,234

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Nuveen Asset Management, LLC joint	1,425	$2,864	0.8%	Defined
TEACHERS ADVISORS, LLC joint	174,809	$351,366	99.2%	Defined

Utah Retirement Systems

$310,122

0.17%

154,290

BANK OF AMERICA CORP /DE/

$286,781

0.15%

142,678

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	92,398	$185,719	64.8%	Defined
MERRILL LYNCH, PIERCE, FENNER & SMITH INC.	25,976	$52,211	18.2%	Defined
BOFA SECURITIES, INC.	24,304	$48,851	17.0%	Defined

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$286,425

0.15%

142,500

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$273,159

0.15%

135,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	135,900	$273,159	100.0%	Other

CANADA PENSION PLAN INVESTMENT BOARD

$263,913

0.14%

131,300

MORGAN STANLEY

$242,163

0.13%

120,480

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	530	$1,065	0.4%	Defined
MORGAN STANLEY & CO. LLC	28,673	$57,632	23.8%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	69,404	$139,502	57.6%	Defined
MORGAN STANLEY SMITH BARNEY LLC	10,408	$20,920	8.6%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	11,465	$23,044	9.5%	Defined

JANE STREET GROUP, LLC

$241,401

0.13%

120,100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	120,100	$241,401	100.0%	Defined

PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO

$240,735

0.13%

119,769

RHUMBLINE ADVISERS

$220,159

0.12%

109,532

ALLIANCEBERNSTEIN L.P.

$218,969

0.12%

108,940

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	108,940	$218,969	100.0%	Defined

CITADEL ADVISORS LLC

$218,889

0.12%

108,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	108,900	$218,889	100.0%	Defined

STRS OHIO

$204,216

0.11%

101,600

Russell Investments Group, Ltd.

$197,973

0.11%

98,496

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC joint	66,609	$133,882	67.6%	Defined
Russell Investments Capital, LLC joint	9,499	$19,092	9.6%	Other
Russell Investments France SAS	5,248	$10,548	5.3%	Defined
Russell Investments Trust Company joint	17,140	$34,451	17.4%	Other

WELLS FARGO & COMPANY/MN

$179,235

0.10%

89,172

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	88,715	$178,317	99.5%	Defined
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	257	$516	0.3%	Defined
WELLS FARGO CLEARING SERVICES, LLC	200	$402	0.2%	Defined

SIMPLEX TRADING, LLC

$171,830

0.09%

85,488

PRICE T ROWE ASSOCIATES INC /MD/

$164,126

0.09%

81,655

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	81,655	$164,126	100.0%	Defined

Blackstone Inc.

$155,061

0.08%

77,145

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Blackstone Real Estate Advisors L.P.	77,145	$155,061	100.0%	Other

Jasper Ridge Partners, L.P.

$147,797

0.08%

73,531

SEI INVESTMENTS CO

$143,013

0.08%

71,151

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SEI TRUST CO	71,151	$143,013	100.0%	Sole

DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main

$140,028

0.08%

69,666

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UNION ASSET MANAGEMENT HOLDING AG joint	69,666	$140,028	100.0%	Defined

IEQ CAPITAL, LLC

$121,745

0.07%

60,570

Verdad Advisers, LP

$121,623

0.07%

60,509

MetLife Investment Management, LLC

$117,978

0.06%

58,696

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
METLIFE INC	58,696	$117,978	100.0%	Defined

Mariner, LLC

$105,945

0.06%

52,709

Vanguard Personalized Indexing Management, LLC

$99,384

0.05%

49,445

HSBC HOLDINGS PLC

$97,531

0.05%

48,523

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
HSBC BANK PLC	48,523	$97,531	100.0%	Defined

Graham Capital Management, L.P.

$93,456

0.05%

46,496

CITIGROUP INC

$93,012

0.05%

46,275

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	46,275	$93,012	100.0%	Defined

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$90,831

0.05%

45,190

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	45,190	$90,831	100.0%	Defined

BARCLAYS PLC

$90,363

0.05%

44,957

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	41,317	$83,047	91.9%	Defined
BARCLAYS CAPITAL INC.	3,640	$7,316	8.1%	Defined

JPMORGAN CHASE & CO

$86,425

0.05%

42,998

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	42,000	$84,420	97.7%	Defined
J.P. Morgan Investment Management Inc.	493	$990	1.1%	Defined
J.P. Morgan Securities plc	505	$1,015	1.2%	Defined

Diversified Trust Co

$85,125

0.05%

42,351

DIMENSIONAL FUND ADVISORS LP

$67,792

0.04%

33,728

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	3,487	$7,008	10.3%	Defined
Dimensional Ireland Ltd	11,623	$23,362	34.5%	Defined
Held directly	18,618	$37,422	55.2%	Sole

Cerity Partners LLC

$65,366

0.04%

32,521

Vanguard Global Advisers, LLC

$62,917

0.03%

31,302

Cannell & Spears LLC

$60,987

0.03%

30,342

WEALTH ENHANCEMENT ADVISORY SERVICES, LLC

$60,804

0.03%

30,251

Vontobel Holding Ltd.

$60,300

0.03%

30,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK VONTOBEL AG	30,000	$60,300	100.0%	Defined

Point72 Asset Management, L.P.

$53,664

0.03%

26,699

ROYAL BANK OF CANADA

$52,504

0.03%

26,122

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	2,973	$5,975	11.4%	Defined
RBC Capital Markets, LLC	23,149	$46,529	88.6%	Defined

MERCER GLOBAL ADVISORS INC /ADV

$51,263

0.03%

25,504

GROUP ONE TRADING LLC

$50,668

0.03%

25,208

INTECH INVESTMENT MANAGEMENT LLC

$49,305

0.03%

24,530

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$48,487

0.03%

24,123

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	24,123	$48,487	100.0%	Other

Police & Firemen's Retirement System of New Jersey

$47,086

0.03%

23,426

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Capital	23,426	$47,086	100.0%	Defined

VOYA INVESTMENT MANAGEMENT LLC

$44,014

0.02%

21,898

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Voya Investment Management Co. LLC joint	21,898	$44,014	100.0%	Defined

BNP PARIBAS ARBITRAGE, SA

$42,612

0.02%

21,200

MANUFACTURERS LIFE INSURANCE COMPANY, THE

$38,987

0.02%

19,397

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MANULIFE FINANCIAL CORP joint	19,397	$38,987	100.0%	Defined

Qube Research & Technologies Ltd

$33,303

0.02%

16,569

CAPTRUST FINANCIAL ADVISORS

$32,234

0.02%

16,037

PRUDENTIAL FINANCIAL INC

$32,190

0.02%

16,015

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PGIM Quantitative Solutions LLC	16,015	$32,190	100.0%	Defined

Key facts CIK 1653087 CUSIP 014442107 13F (30d) 60 filings 60 filers Visit website Investor relations