Steven Cohen’s Atara Biotherapeutics ATRA Stock Holding History

Steven Cohen’s Portfolio ATRA Stock Details ATRA Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$7.9M	Buy	687,718 +493,454	+254%	+$3.94M	0.01%	1434
2026 Q1	$919K	Buy	194,264 +175,968	+962%	+$1.07M	﹤0.01%	2814
2025 Q4	$331K	Buy	+18,296	New	+$273K	﹤0.01%	3438
2023 Q4	–	Sell	-22,200	Closed	-$821K	–	2155
2023 Q3	$821K	Sell	22,200 -689	-3%	-$30.7K	﹤0.01%	1388
2023 Q2	$921K	Buy	22,889 +21,799	+2,000%	+$1.23M	﹤0.01%	1157
2023 Q1	$79K	Buy	+1,090	New	+$106K	﹤0.01%	1681
2022 Q4	–	Sell	-1,200	Closed	-$113K	–	1507
2022 Q3	$113K	Sell	1,200 -153,888	-99%	-$17.3M	﹤0.01%	1294
2022 Q2	$30.2M	Sell	155,088 -9,059	-6%	-$1.48M	0.13%	222
2022 Q1	$38.1M	Sell	164,147 -20,401	-11%	-$6.5M	0.15%	188
2021 Q4	$72.7M	Buy	184,548 +91,816	+99%	+$38.7M	0.29%	71
2021 Q3	$41.5M	Buy	92,732 +63,136	+213%	+$22.6M	0.18%	140
2021 Q2	$11.5M	Buy	29,596 +8,112	+38%	+$2.89M	0.05%	419
2021 Q1	$7.71M	Sell	21,484 -23,548	-52%	-$10.4M	0.04%	487
2020 Q4	$22.1M	Buy	+45,032	New	+$20.8M	0.11%	264
2020 Q3	–	Sell	-5,310	Closed	-$1.93M	–	917
2020 Q2	$1.93M	Buy	+5,310	New	+$1.34M	0.01%	596
2019 Q1	–	Sell	-22,124	Closed	-$19.2M	–	1009
2018 Q4	$19.2M	Buy	+22,124	New	+$20.5M	0.09%	269
2015 Q2	–	Sell	-1,004	Closed	-$1.04M	–	716
2015 Q1	$1.04M	Buy	+1,004	New	+$664K	0.01%	615

Other funds holding ATRA

EcoR1 Capital San Francisco, California $2.06B AUM 215.32% 1-Year Est. Return

Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return

Redmile Group San Francisco, California $1.49B AUM 208.7% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Mackenzie Financial Toronto Ontario, Ontario, Canada $100B AUM 36.93% 1-Year Est. Return

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

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

SCA

STALEY CAPITAL ADVISERS Pittsburgh, Pennsylvania $2.57B AUM 26.96% 1-Year Est. Return

Vanguard Fiduciary Trust Malvern, Pennsylvania $454B AUM

Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return

Steven Cohen's ATRA Position: Q2 2026 in Review

Steven Cohen increased its Atara Biotherapeutics (ATRA) stake by 254% in Q2 2026, buying an estimated $3.94M and bringing the position to 687,718 shares worth $7.9M. The position accounts for 0.01% of the portfolio, ranked #1434.

Steven Cohen first reported a position in ATRA in Q1 2015 and has held it in 17 quarters since. The position peaked at $72.7M in Q4 2021. 36 funds tracked by Wall St. Rank hold ATRA as of Q2 2026.

Steven Cohen held 687,718 shares of Atara Biotherapeutics worth $7.9M as of Q2 2026.
Steven Cohen bought 493,454 Atara Biotherapeutics shares in Q2 2026, an estimated $3.94M.
Atara Biotherapeutics made up 0.01% of Steven Cohen's portfolio in Q2 2026, its #1434 holding.
Steven Cohen first reported a position in Atara Biotherapeutics in Q1 2015 and has held it in 17 quarters since.
Steven Cohen's Atara Biotherapeutics position peaked at $72.7M in Q4 2021.
36 funds tracked by Wall St. Rank held Atara Biotherapeutics as of Q2 2026.

Based on Point72 Asset Management's 13F filing for Q2 2026, filed 14 Aug 2026.