Marshall Wace
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Marshall Wace’s Alector ALEC Stock Holding History

Marshall Wace’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 		$1.33M Sell
620,424
-546,393
-47% -$1.1M ﹤0.01% 1996
2025
Q4 		$1.82M Buy
1,166,817
+1,015,174
+669% +$1.8M ﹤0.01% 1625
2025
Q3 		$449K Buy
+151,643
New +$334K ﹤0.01% 2271
2025
Q2 		– Sell
-59,099
Closed -$72.7K – 2657
2025
Q1 		$72.7K Buy
59,099
+10,651
+22% +$17.3K ﹤0.01% 2517
2024
Q4 		$91.6K Sell
48,448
-5,552
-10% -$20.9K ﹤0.01% 2450
2024
Q3 		$252K Buy
54,000
+1,391
+3% +$7.46K ﹤0.01% 2217
2024
Q2 		$239K Sell
52,609
-124,669
-70% -$642K ﹤0.01% 2239
2024
Q1 		$1.07M Buy
+177,278
New +$1.16M ﹤0.01% 1629
2022
Q3 		– Sell
-629,852
Closed -$6.4M – 3291
2022
Q2 		$6.4M Buy
629,852
+118,712
+23% +$1.18M 0.01% 1175
2022
Q1 		$7.28M Sell
511,140
-569,714
-53% -$9.01M 0.01% 1100
2021
Q4 		$22.3M Buy
1,080,854
+768,293
+246% +$17.3M 0.04% 459
2021
Q3 		$7.13M Buy
+312,561
New +$8.75M 0.03% 751
2021
Q1 		– Sell
-80,371
Closed -$1.22M – 2429
2020
Q4 		$1.22M Sell
80,371
-51,047
-39% -$634K 0.01% 1139
2020
Q3 		$1.39M Buy
131,418
+38,181
+41% +$618K 0.01% 909
2020
Q2 		$2.28M Buy
+93,237
New +$2.57M 0.02% 739
2020
Q1 		– Sell
-15,968
Closed -$275K – 1598
2019
Q4 		$275K Buy
+15,968
New +$271K ﹤0.01% 1293

Other funds holding ALEC

TCM
TCG Crossover Management Palo Alto, California $3.5B AUM 1,165.83% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 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

Marshall Wace's ALEC Position: Q1 2026 in Review

Marshall Wace reduced its Alector (ALEC) stake by 47% in Q1 2026, selling an estimated $1.1M and leaving 620,424 shares worth $1.33M. The position accounts for ﹤0.01% of the portfolio, ranked #1996.

Marshall Wace first reported a position in ALEC in Q4 2019 and has held it in 16 quarters since. The position peaked at $22.3M in Q4 2021. 138 funds tracked by Wall St. Rank hold ALEC as of Q1 2026.

  • Marshall Wace held 620,424 shares of Alector worth $1.33M as of Q1 2026.
  • Marshall Wace sold 546,393 Alector shares in Q1 2026, an estimated $1.1M.
  • Alector made up ﹤0.01% of Marshall Wace's portfolio in Q1 2026, its #1996 holding.
  • Marshall Wace first reported a position in Alector in Q4 2019 and has held it in 16 quarters since.
  • Marshall Wace's Alector position peaked at $22.3M in Q4 2021.
  • 138 funds tracked by Wall St. Rank held Alector as of Q1 2026.

Based on Marshall Wace's 13F filing for Q1 2026, filed 15 May 2026.