Jane Street’s Y-mAbs Therapeutics YMAB Stock Holding History

Jane Street’s Portfolio YMAB Stock Details YMAB Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2024 Q4	–	Sell	-20,000	Closed	-$263K	–	10774
2024 Q3	$263K	Buy	+20,000	New	+$254K	﹤0.01%	8241

Other funds holding YMAB

BIG

Brooklyn Investment Group Brooklyn, New York $3.2B AUM 26.32% 1-Year Est. Return

IFP Advisors Tampa, Florida $5.54B AUM 27.43% 1-Year Est. Return

Jane Street's YMAB Position: Q3 2025 in Review

Jane Street sold out of Y-mAbs Therapeutics (YMAB) in Q3 2025, closing a stake of 60,873 shares — an estimated $275K sold.

Jane Street first reported a position in YMAB in Q2 2020 and held it in 16 quarters. The position peaked at $1.63M in Q1 2024. 2 funds tracked by Wall St. Rank hold YMAB as of Q3 2025.

Jane Street reported no remaining Y-mAbs Therapeutics position as of Q3 2025 after selling out during the quarter.
Jane Street sold 60,873 Y-mAbs Therapeutics shares in Q3 2025, an estimated $275K.
Jane Street first reported a position in Y-mAbs Therapeutics in Q2 2020 and held it in 16 quarters.
Jane Street's Y-mAbs Therapeutics position peaked at $1.63M in Q1 2024.
2 funds tracked by Wall St. Rank held Y-mAbs Therapeutics as of Q3 2025.

Based on Jane Street's 13F filing for Q3 2025, filed 14 Nov 2025.