Jim Simons
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Jim Simons’s Alector ALEC Stock Holding History

Jim Simons’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 		$2.77M Sell
1,287,691
-255,959
-17% -$514K ﹤0.01% 1702
2025
Q4 		$2.41M Buy
1,543,650
+594,500
+63% +$1.05M ﹤0.01% 1748
2025
Q3 		$2.81M Sell
949,150
-305,700
-24% -$673K ﹤0.01% 1851
2025
Q2 		$1.76M Buy
1,254,850
+220,995
+21% +$277K ﹤0.01% 2197
2025
Q1 		$1.27M Buy
1,033,855
+118,117
+13% +$192K ﹤0.01% 2258
2024
Q4 		$1.73M Buy
915,738
+353,988
+63% +$1.33M ﹤0.01% 2148
2024
Q3 		$2.62M Sell
561,750
-93,300
-14% -$500K ﹤0.01% 1846
2024
Q2 		$2.97M Sell
655,050
-20,433
-3% -$105K 0.01% 1619
2024
Q1 		$4.07M Buy
675,483
+103,500
+18% +$677K 0.01% 1541
2023
Q4 		$4.56M Buy
571,983
+69,780
+14% +$413K 0.01% 1406
2023
Q3 		$3.25M Sell
502,203
-184,880
-27% -$1.2M 0.01% 1548
2023
Q2 		$4.13M Buy
687,083
+37,122
+6% +$259K 0.01% 1536
2023
Q1 		$4.02M Buy
649,961
+58,149
+10% +$473K 0.01% 1600
2022
Q4 		$5.46M Sell
591,812
-128,771
-18% -$1.12M 0.01% 1467
2022
Q3 		$6.82M Sell
720,583
-246,000
-25% -$2.66M 0.01% 1248
2022
Q2 		$9.82M Buy
966,583
+260,803
+37% +$2.6M 0.01% 1129
2022
Q1 		$10.1M Buy
705,780
+432,300
+158% +$6.84M 0.01% 1123
2021
Q4 		$5.65M Buy
+273,480
New +$6.17M 0.01% 1453
2020
Q3 		– Sell
-69,780
Closed -$1.71M – 3347
2020
Q2 		$1.71M Buy
+69,780
New +$1.93M ﹤0.01% 2259

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 $6.73T AUM 46.02% 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 $526M AUM 175.27% 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

Jim Simons's ALEC Position: Q1 2026 in Review

Jim Simons reduced its Alector (ALEC) stake by 17% in Q1 2026, selling an estimated $514K and leaving 1,287,691 shares worth $2.77M. The position accounts for ﹤0.01% of the portfolio, ranked #1702.

Jim Simons first reported a position in ALEC in Q2 2020 and has held it in 19 quarters since. The position peaked at $10.1M in Q1 2022. 138 funds tracked by Wall St. Rank hold ALEC as of Q1 2026.

  • Jim Simons held 1,287,691 shares of Alector worth $2.77M as of Q1 2026.
  • Jim Simons sold 255,959 Alector shares in Q1 2026, an estimated $514K.
  • Alector made up ﹤0.01% of Jim Simons's portfolio in Q1 2026, its #1702 holding.
  • Jim Simons first reported a position in Alector in Q2 2020 and has held it in 19 quarters since.
  • Jim Simons's Alector position peaked at $10.1M in Q1 2022.
  • 138 funds tracked by Wall St. Rank held Alector as of Q1 2026.

Based on Renaissance Technologies's 13F filing for Q1 2026, filed 14 May 2026.