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	$1.03M	Buy	1,721,297 +1,672,795	+3,449%	+$1.09M	﹤0.01%	6491
2026 Q1	$37.8K	Sell	48,502 -139,647	-74%	-$118K	﹤0.01%	11058
2025 Q4	$147K	Sell	188,149 -39,636	-17%	-$32.5K	﹤0.01%	9946
2025 Q3	$164K	Buy	227,785 +191,362	+525%	+$867K	﹤0.01%	9819
2025 Q2	$185K	Sell	36,423 -138,084	-79%	-$543K	﹤0.01%	8612
2025 Q1	$527K	Sell	174,507 -24,499	-12%	-$89.3K	﹤0.01%	6761
2024 Q4	$720K	Buy	199,006 +175,252	+738%	+$531K	﹤0.01%	6008
2024 Q3	$41.8K	Sell	23,754 -4,702	-17%	-$8.55K	﹤0.01%	9203
2024 Q2	$44.4K	Sell	28,456 -33,684	-54%	-$58.6K	﹤0.01%	8942
2024 Q1	$121K	Buy	+62,140	New	+$108K	﹤0.01%	8453
2022 Q3	–	Sell	-10,157	Closed	-$29K	–	10627
2022 Q2	$29K	Buy	+10,157	New	+$36.7K	﹤0.01%	9071
2021 Q4	–	Sell	-136,901	Closed	-$1.14M	–	10927
2021 Q3	$1.24M	Buy	+136,901	New	+$819K	﹤0.01%	5469
2019 Q3	–	Sell	-1,470	Closed	-$8K	–	5881
2019 Q2	$8K	Buy	+1,470	New	+$9.98K	﹤0.01%	5047
2018 Q4	–	Sell	-1,338	Closed	-$15K	–	5859
2018 Q3	$15K	Buy	+1,338	New	+$14.6K	﹤0.01%	4982

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. 90 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.
90 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.