Simplex Trading
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Simplex Trading’s Alector ALEC Stock Holding History

Simplex Trading’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 		$147K Sell
68,477
-13,540
-17% -$27.2K ﹤0.01% 4653
2025
Q4 		$128K Sell
82,017
-18,927
-19% -$33.6K ﹤0.01% 4720
2025
Q3 		$298K Buy
+100,944
New +$222K ﹤0.01% 4466
2024
Q4 		– Sell
-46,344
Closed -$174K – 8406
2024
Q3 		$215K Buy
46,344
+22,913
+98% +$123K ﹤0.01% 4445
2024
Q2 		$106K Sell
23,431
-5,701
-20% -$29.3K ﹤0.01% 5318
2024
Q1 		$175K Buy
+29,132
New +$190K ﹤0.01% 4999
2023
Q4 		– Sell
-444
Closed -$2.63K – 8688
2023
Q3 		$2K Buy
+444
New +$2.88K ﹤0.01% 8029
2023
Q1 		– Sell
-5,726
Closed -$46.6K – 8910
2022
Q4 		$52K Buy
+5,726
New +$49.9K ﹤0.01% 5823
2022
Q3 		– Sell
-1,901
Closed -$20.6K – 9807
2022
Q2 		$19K Sell
1,901
-10,227
-84% -$102K ﹤0.01% 7648
2022
Q1 		$172K Buy
12,128
+4,185
+53% +$66.2K ﹤0.01% 5367
2021
Q4 		$164K Sell
7,943
-5,578
-41% -$126K ﹤0.01% 5465
2021
Q3 		$303K Sell
13,521
-300
-2% -$8.4K ﹤0.01% 4890
2021
Q2 		$287K Buy
13,821
+10,197
+281% +$192K ﹤0.01% 5049
2021
Q1 		$72K Buy
3,624
+464
+15% +$8.32K ﹤0.01% 6165
2020
Q4 		$47K Sell
3,160
-10,453
-77% -$130K ﹤0.01% 6241
2020
Q3 		$143K Buy
13,613
+13,294
+4,167% +$215K ﹤0.01% 4516
2020
Q2 		$7K Sell
319
-671
-68% -$18.5K ﹤0.01% 6803
2020
Q1 		$23K Buy
+990
New +$25.2K ﹤0.01% 5819

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

Simplex Trading's ALEC Position: Q1 2026 in Review

Simplex Trading reduced its Alector (ALEC) stake by 17% in Q1 2026, selling an estimated $27.2K and leaving 68,477 shares worth $147K. The position accounts for ﹤0.01% of the portfolio, ranked #4653.

Simplex Trading first reported a position in ALEC in Q1 2020 and has held it in 18 quarters since. The position peaked at $303K in Q3 2021. 138 funds tracked by Wall St. Rank hold ALEC as of Q1 2026.

  • Simplex Trading held 68,477 shares of Alector worth $147K as of Q1 2026.
  • Simplex Trading sold 13,540 Alector shares in Q1 2026, an estimated $27.2K.
  • Alector made up ﹤0.01% of Simplex Trading's portfolio in Q1 2026, its #4653 holding.
  • Simplex Trading first reported a position in Alector in Q1 2020 and has held it in 18 quarters since.
  • Simplex Trading's Alector position peaked at $303K in Q3 2021.
  • 138 funds tracked by Wall St. Rank held Alector as of Q1 2026.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.