SOUTH SAN FRANCISCO, CA
ALECTOR, INC.ALEC— Latest position per institution from SEC 13F filings
15
Institutional holders
101.28M
Total shares held
242.80M
Estimated value
5.06M
Avg. position size
TCG CROSSOVER MANAGEMENT, LLC
CIK 1839948
Shares
10M
Value
20.10M
Filed
Jun 30, 2026
RA CAPITAL MANAGEMENT, L.P.
CIK 1346824
Shares
9.70M
Value
11.93M
Filed
Mar 31, 2025
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
9.10M
Value
41.32M
Filed
Jun 30, 2024
BLACKROCK, INC.
CIK 2012383
Shares
7.85M
Value
15.77M
Filed
Jun 30, 2026
RTW INVESTMENTS, LP
CIK 1493215
Shares
6.99M
Value
20.69M
Filed
Sep 30, 2025
VANGUARD GROUP INC
CIK 102909
Shares
6.91M
Value
10.78M
Filed
Dec 31, 2025
DEEP TRACK CAPITAL, LP
CIK 1856083
Shares
4.63M
Value
21.59M
Filed
Sep 30, 2024
ACADIAN ASSET MANAGEMENT LLC
CIK 916542
Shares
4.41M
Value
8.86K
Filed
Jun 30, 2026
NANTAHALA CAPITAL MANAGEMENT, LLC
CIK 1472322
Shares
4.32M
Value
8.68M
Filed
Jun 30, 2026
ECOR1 CAPITAL, LLC
CIK 1587114
Shares
4.06M
Value
24.42M
Filed
Mar 31, 2024
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
4.01M
Value
8.06M
Filed
Jun 30, 2026
FORESITE CAPITAL MANAGEMENT IV, LLC
CIK 1704132
Shares
3.89M
Value
8.36M
Filed
Mar 31, 2026
KYNAM CAPITAL MANAGEMENT, LP
CIK 1907884
Shares
3.81M
Value
7.66M
Filed
Jun 30, 2026
BALYASNY ASSET MANAGEMENT L.P.
CIK 1218710
Shares
3.75M
Value
7.54M
Filed
Jun 30, 2026
MERCK & CO., INC.
CIK 310158
Shares
3.55M
Value
7.13M
Filed
Jun 30, 2026
683 CAPITAL MANAGEMENT, LLC
CIK 1404574
Shares
3.20M
Value
6.43M
Filed
Jun 30, 2026
D. E. SHAW & CO., INC.
CIK 1009207
Shares
2.96M
Value
5.95M
Filed
Jun 30, 2026
ADAR1 CAPITAL MANAGEMENT, LLC
CIK 1940272
Shares
2.88M
Value
5.80M
Filed
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
2.82M
Value
5.67M
Filed
Jun 30, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
2.45M
Value
4.93M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | TCG CROSSOVER MANAGEMENT, LLC | 1839948 | 10M | 20.10M | Jun 30, 2026 |
| 2 | RA CAPITAL MANAGEMENT, L.P. | 1346824 | 9.70M | 11.93M | Mar 31, 2025 |
| 3 | BLACKROCK FINANCE, INC. | 1364742 | 9.10M | 41.32M | Jun 30, 2024 |
| 4 | BLACKROCK, INC. | 2012383 | 7.85M | 15.77M | Jun 30, 2026 |
| 5 | RTW INVESTMENTS, LP | 1493215 | 6.99M | 20.69M | Sep 30, 2025 |
| 6 | VANGUARD GROUP INC | 102909 | 6.91M | 10.78M | Dec 31, 2025 |
| 7 | DEEP TRACK CAPITAL, LP | 1856083 | 4.63M | 21.59M | Sep 30, 2024 |
| 8 | ACADIAN ASSET MANAGEMENT LLC | 916542 | 4.41M | 8.86K | Jun 30, 2026 |
| 9 | NANTAHALA CAPITAL MANAGEMENT, LLC | 1472322 | 4.32M | 8.68M | Jun 30, 2026 |
| 10 | ECOR1 CAPITAL, LLC | 1587114 | 4.06M | 24.42M | Mar 31, 2024 |
| 11 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 4.01M | 8.06M | Jun 30, 2026 |
| 12 | FORESITE CAPITAL MANAGEMENT IV, LLC | 1704132 | 3.89M | 8.36M | Mar 31, 2026 |
| 13 | KYNAM CAPITAL MANAGEMENT, LP | 1907884 | 3.81M | 7.66M | Jun 30, 2026 |
| 14 | BALYASNY ASSET MANAGEMENT L.P. | 1218710 | 3.75M | 7.54M | Jun 30, 2026 |
| 15 | MERCK & CO., INC. | 310158 | 3.55M | 7.13M | Jun 30, 2026 |
| 16 | 683 CAPITAL MANAGEMENT, LLC | 1404574 | 3.20M | 6.43M | Jun 30, 2026 |
| 17 | D. E. SHAW & CO., INC. | 1009207 | 2.96M | 5.95M | Jun 30, 2026 |
| 18 | ADAR1 CAPITAL MANAGEMENT, LLC | 1940272 | 2.88M | 5.80M | Jun 30, 2026 |
| 19 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 2.82M | 5.67M | Jun 30, 2026 |
| 20 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 2.45M | 4.93M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.