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BlackRock’s Alector ALEC Stock Holding History

BlackRock’s Portfolio ALEC Stock Details ALEC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$16.6M Buy
7,741,245
+593,479
+8% +$1.19M ﹤0.01% 3190
2025
Q4 		$11.2M Sell
7,147,766
-50,207
-0.7% -$89.1K ﹤0.01% 3408
2025
Q3 		$21.3M Sell
7,197,973
-775,607
-10% -$1.71M ﹤0.01% 3060
2025
Q2 		$11.2M Sell
7,973,580
-306,122
-4% -$383K ﹤0.01% 3358
2025
Q1 		$10.2M Sell
8,279,702
-857,045
-9% -$1.4M ﹤0.01% 3309
2024
Q4 		$17.3M Sell
9,136,747
-215,297
-2% -$810K ﹤0.01% 3132
2024
Q3 		$43.6M Buy
9,352,044
+250,607
+3% +$1.34M ﹤0.01% 2552
2024
Q2 		$41.3M Buy
9,101,437
+617,872
+7% +$3.18M ﹤0.01% 2538
2024
Q1 		$51.1M Buy
8,483,565
+415,012
+5% +$2.71M ﹤0.01% 2427
2023
Q4 		$64.4M Buy
8,068,553
+337,575
+4% +$2M ﹤0.01% 2325
2023
Q3 		$50.1M Sell
7,730,978
-94,575
-1% -$612K ﹤0.01% 2392
2023
Q2 		$47M Buy
7,825,553
+241,637
+3% +$1.69M ﹤0.01% 2521
2023
Q1 		$46.9M Buy
7,583,916
+215,296
+3% +$1.75M ﹤0.01% 2492
2022
Q4 		$68M Buy
7,368,620
+1,365,044
+23% +$11.9M ﹤0.01% 2257
2022
Q3 		$56.8M Buy
6,003,576
+178,917
+3% +$1.93M ﹤0.01% 2343
2022
Q2 		$59.2M Buy
5,824,659
+454,674
+8% +$4.53M ﹤0.01% 2372
2022
Q1 		$76.5M Sell
5,369,985
-10,424
-0.2% -$165K ﹤0.01% 2311
2021
Q4 		$111M Buy
5,380,409
+109,595
+2% +$2.47M ﹤0.01% 2154
2021
Q3 		$120M Buy
5,270,814
+85,050
+2% +$2.38M ﹤0.01% 2095
2021
Q2 		$108M Sell
5,185,764
-97,745
-2% -$1.84M ﹤0.01% 2197
2021
Q1 		$106M Buy
5,283,509
+121,313
+2% +$2.17M ﹤0.01% 2165
2020
Q4 		$78.1M Sell
5,162,196
-183,075
-3% -$2.28M ﹤0.01% 2224
2020
Q3 		$56.3M Buy
5,345,271
+205,976
+4% +$3.33M ﹤0.01% 2225
2020
Q2 		$126M Buy
5,139,295
+934,409
+22% +$25.8M 0.01% 1696
2020
Q1 		$101M Buy
4,204,886
+1,279,868
+44% +$32.6M 0.01% 1635
2019
Q4 		$50.4M Buy
2,925,018
+748,096
+34% +$12.7M ﹤0.01% 2360
2019
Q3 		$31.4M Buy
2,176,922
+1,310,102
+151% +$23.6M ﹤0.01% 2555
2019
Q2 		$16.5M Buy
866,820
+427,642
+97% +$8.68M ﹤0.01% 2953
2019
Q1 		$8.22M Buy
+439,178
New +$8.31M ﹤0.01% 3205

Other funds holding ALEC

TCM
TCG Crossover Management Palo Alto, California $3.5B AUM 1,165.83% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
FCMI
Foresite Capital Management IV Larkspur, California $237M AUM 107.53% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
MC
Merck & Co Kenilworth, New Jersey $349M AUM 146.07% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
6CM
683 Capital Management New York $1.92B AUM 85.52% 1-Year Est. Return
Balyasny Asset Management
Balyasny Asset Management Chicago, Illinois $77.1B AUM 42.89% 1-Year Est. Return
NCM
Nantahala Capital Management New Canaan, Connecticut $2.72B AUM 121.58% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

BlackRock's ALEC Position: Q1 2026 in Review

BlackRock increased its Alector (ALEC) stake by 8.3% in Q1 2026, buying an estimated $1.19M and bringing the position to 7,741,245 shares worth $16.6M. The position accounts for ﹤0.01% of the portfolio, ranked #3190.

BlackRock first reported a position in ALEC in Q1 2019 and has held it in 29 quarters since. The position peaked at $126M in Q2 2020. 138 funds tracked by Wall St. Rank hold ALEC as of Q1 2026.

  • BlackRock held 7,741,245 shares of Alector worth $16.6M as of Q1 2026.
  • BlackRock bought 593,479 Alector shares in Q1 2026, an estimated $1.19M.
  • Alector made up ﹤0.01% of BlackRock's portfolio in Q1 2026, its #3190 holding.
  • BlackRock first reported a position in Alector in Q1 2019 and has held it in 29 quarters since.
  • BlackRock's Alector position peaked at $126M in Q2 2020.
  • 138 funds tracked by Wall St. Rank held Alector as of Q1 2026.

Based on BlackRock's 13F filing for Q1 2026, filed 13 May 2026.