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 		$66.2K Sell
30,800
-236,400
-88% -$475K ﹤0.01% 5547
2025
Q4 		$417K Buy
267,200
+229,700
+613% +$408K ﹤0.01% 3489
2025
Q3 		$111K Sell
37,500
-55,300
-60% -$122K ﹤0.01% 5613
2025
Q2 		$129K Sell
92,800
-105,300
-53% -$132K ﹤0.01% 4974
2025
Q1 		$243K Buy
198,100
+71,100
+56% +$116K ﹤0.01% 4111
2024
Q4 		$240K Buy
+127,000
New +$478K ﹤0.01% 4328
2024
Q3 		– Sell
-1,300
Closed -$5K – 8369
2024
Q2 		$5K Hold
1,300
– – ﹤0.01% 7821
2024
Q1 		$7K Sell
1,300
-10,600
-89% -$69.3K ﹤0.01% 7799
2023
Q4 		$94K Buy
11,900
+3,200
+37% +$19K ﹤0.01% 5445
2023
Q3 		$56K Buy
8,700
+3,900
+81% +$25.2K ﹤0.01% 5694
2023
Q2 		$28K Sell
4,800
-400
-8% -$2.79K ﹤0.01% 6413
2023
Q1 		$32K Buy
5,200
+1,400
+37% +$11.4K ﹤0.01% 6413
2022
Q4 		$35K Sell
3,800
-9,200
-71% -$80.2K ﹤0.01% 6267
2022
Q3 		$122K Buy
13,000
+10,600
+442% +$115K ﹤0.01% 5241
2022
Q2 		$24K Buy
2,400
+200
+9% +$2K ﹤0.01% 7372
2022
Q1 		$31K Sell
2,200
-8,800
-80% -$139K ﹤0.01% 7717
2021
Q4 		$227K Buy
11,000
+3,700
+51% +$83.4K ﹤0.01% 5001
2021
Q3 		$163K Buy
7,300
+200
+3% +$5.6K ﹤0.01% 5921
2021
Q2 		$147K Buy
7,100
+7,064
+19,622% +$133K ﹤0.01% 6162
2021
Q1 		$72K Sell
36
-55
-60% -$986 ﹤0.01% 6164
2020
Q4 		$137K Buy
91
+63
+225% +$783 ﹤0.01% 5088
2020
Q3 		$29K Buy
28
+24
+600% +$388 ﹤0.01% 6092
2020
Q2 		$9K Sell
4
-2
-33% -$55 ﹤0.01% 6693
2020
Q1 		$14K Buy
+6
New +$153 ﹤0.01% 6213

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.