Jane Street’s aTyr Pharma ATYR Stock Holding History

Jane Street’s Portfolio ATYR Stock Details ATYR Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$107K	Sell	178,600 -274,300	-61%	-$179K	﹤0.01%	10557
2026 Q1	$353K	Buy	452,900 +162,400	+56%	+$137K	﹤0.01%	8851
2025 Q4	$227K	Sell	290,500 -393,300	-58%	-$323K	﹤0.01%	9458
2025 Q3	$493K	Buy	683,800 +582,600	+576%	+$2.64M	﹤0.01%	7890
2025 Q2	$513K	Buy	+101,200	New	+$398K	﹤0.01%	6874
2021 Q4	–	Sell	-171,200	Closed	-$1.55M	–	10926
2021 Q3	$1.55M	Buy	+171,200	New	+$1.02M	﹤0.01%	5002

Other funds holding ATYR

Federated Hermes Pittsburgh, Pennsylvania $69.6B AUM 42.52% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

GCP

GSA Capital Partners London, United Kingdom $1.59B AUM 39.81% 1-Year Est. Return

AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

KCM

Kalehua Capital Management Dallas, Texas $174M AUM

UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

Jane Street's ATYR Position: Q2 2026 in Review

Jane Street increased its aTyr Pharma (ATYR) stake by 3,449% in Q2 2026, buying an estimated $1.09M and bringing the position to 1,721,297 shares worth $1.03M. The position accounts for ﹤0.01% of the portfolio, ranked #6491.

Jane Street first reported a position in ATYR in Q3 2018 and has held it in 14 quarters since. The position peaked at $1.24M in Q3 2021. 89 funds tracked by Wall St. Rank hold ATYR as of Q2 2026.

Jane Street held 1,721,297 shares of aTyr Pharma worth $1.03M as of Q2 2026.
Jane Street bought 1,672,795 aTyr Pharma shares in Q2 2026, an estimated $1.09M.
aTyr Pharma made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #6491 holding.
Jane Street first reported a position in aTyr Pharma in Q3 2018 and has held it in 14 quarters since.
Jane Street's aTyr Pharma position peaked at $1.24M in Q3 2021.
89 funds tracked by Wall St. Rank held aTyr Pharma as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.