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 		$21.5K Sell
10,000
-13,100
-57% -$26.3K ﹤0.01% 6717
2025
Q4 		$36K Sell
23,100
-27,100
-54% -$48.1K ﹤0.01% 5943
2025
Q3 		$148K Buy
+50,200
New +$111K ﹤0.01% 5286
2025
Q1 		– Sell
-22,400
Closed -$42K – 8414
2024
Q4 		$42K Buy
22,400
+20,100
+874% +$75.7K ﹤0.01% 6039
2024
Q3 		$10K Buy
+2,300
New +$12.3K ﹤0.01% 7167
2024
Q2 		– Sell
-800
Closed -$4K – 8675
2024
Q1 		$4K Sell
800
-3,900
-83% -$25.5K ﹤0.01% 8076
2023
Q4 		$37K Buy
4,700
+900
+24% +$5.33K ﹤0.01% 6367
2023
Q3 		$24K Buy
3,800
+2,500
+192% +$16.2K ﹤0.01% 6455
2023
Q2 		$7K Hold
1,300
– – ﹤0.01% 7656
2023
Q1 		$8K Sell
1,300
-12,700
-91% -$103K ﹤0.01% 7689
2022
Q4 		$129K Buy
+14,000
New +$122K ﹤0.01% 4767
2022
Q3 		– Sell
-4,800
Closed -$48K – 9808
2022
Q2 		$48K Sell
4,800
-15,000
-76% -$150K ﹤0.01% 6530
2022
Q1 		$282K Buy
19,800
+11,400
+136% +$180K ﹤0.01% 4635
2021
Q4 		$173K Sell
8,400
-1,200
-13% -$27.1K ﹤0.01% 5393
2021
Q3 		$215K Hold
9,600
– – ﹤0.01% 5477
2021
Q2 		$199K Buy
9,600
+9,495
+9,043% +$179K ﹤0.01% 5686
2021
Q1 		$211K Sell
105
-38
-27% -$681 ﹤0.01% 4658
2020
Q4 		$216K Buy
143
+113
+377% +$1.4K ﹤0.01% 4495
2020
Q3 		$31K Buy
30
+29
+2,900% +$469 ﹤0.01% 6030
2020
Q2 		$2K Sell
1
-3
-75% -$83 ﹤0.01% 7215
2020
Q1 		$9K Buy
+4
New +$102 ﹤0.01% 6512

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.