Jane Street’s Alector ALEC Stock Holding History

Jane Street’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	$68.4K	Buy	31,800 +19,200	+152%	+$38.6K	﹤0.01%	10840
2025 Q4	$19.7K	Buy	+12,600	New	+$22.4K	﹤0.01%	10735
2022 Q2	–	Sell	-10,700	Closed	-$152K	–	9564
2022 Q1	$152K	Sell	10,700 -12,100	-53%	-$191K	﹤0.01%	9220
2021 Q4	$471K	Buy	22,800 +500	+2%	+$11.3K	﹤0.01%	7378
2021 Q3	$509K	Buy	22,300 +2,400	+12%	+$67.2K	﹤0.01%	7254
2021 Q2	$415K	Buy	19,900 +5,400	+37%	+$102K	﹤0.01%	7588
2021 Q1	$292K	Buy	14,500 +3,800	+36%	+$68.1K	﹤0.01%	7741
2020 Q4	$162K	Buy	+10,700	New	+$133K	﹤0.01%	7048

Other funds holding ALEC

TCM

TCG Crossover Management Palo Alto, California $3.5B AUM 1,165.83% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

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

Merck & Co Kenilworth, New Jersey $349M AUM 146.07% 1-Year Est. Return

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 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

Jane Street's ALEC Position: Q1 2026 in Review

Jane Street reduced its Alector (ALEC) stake by 60% in Q1 2026, selling an estimated $1.19M and leaving 399,464 shares worth $859K. The position accounts for ﹤0.01% of the portfolio, ranked #6849.

Jane Street first reported a position in ALEC in Q1 2020 and has held it in 23 quarters since. The position peaked at $2M in Q3 2021. 138 funds tracked by Wall St. Rank hold ALEC as of Q1 2026.

Jane Street held 399,464 shares of Alector worth $859K as of Q1 2026.
Jane Street sold 594,449 Alector shares in Q1 2026, an estimated $1.19M.
Alector made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #6849 holding.
Jane Street first reported a position in Alector in Q1 2020 and has held it in 23 quarters since.
Jane Street's Alector position peaked at $2M in Q3 2021.
138 funds tracked by Wall St. Rank held Alector as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.