Group One Trading
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Group One Trading’s Atara Biotherapeutics ATRA Stock Holding History

Group One Trading’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
2025
Q4 		– Sell
-148
Closed -$2.12K – 8105
2025
Q3 		$2.12K Hold
148
– – ﹤0.01% 7878
2025
Q2 		$1.14K Hold
148
– – ﹤0.01% 7532
2025
Q1 		$879 Sell
148
-246
-62% -$2.15K ﹤0.01% 7199
2024
Q4 		$5.24K Hold
394
– – ﹤0.01% 6394
2024
Q3 		$3.2K Sell
394
-4,395
-92% -$37.6K ﹤0.01% 6024
2024
Q2 		$40.7K Sell
4,789
-352
-7% -$5.29K ﹤0.01% 4675
2024
Q1 		$89.2K Sell
5,141
-481
-9% -$8.54K ﹤0.01% 4244
2023
Q4 		$72.1K Buy
5,622
+3,058
+119% +$71.3K ﹤0.01% 4755
2023
Q3 		$94.9K Buy
+2,564
New +$114K ﹤0.01% 4509
2022
Q4 		– Sell
-223
Closed -$23.2K – 7206
2022
Q3 		$21K Buy
+223
New +$25K ﹤0.01% 6028
2022
Q2 		– Sell
-172
Closed -$28.1K – 7775
2022
Q1 		$40K Buy
+172
New +$54.8K ﹤0.01% 6266
2021
Q4 		– Sell
-554
Closed -$233K – 8175
2021
Q3 		$248K Buy
+554
New +$198K ﹤0.01% 4946
2021
Q2 		– Sell
-42
Closed -$15K – 8120
2021
Q1 		$15K Buy
+42
New +$18.6K ﹤0.01% 6877
2019
Q3 		– Sell
-98
Closed -$36.6K – 5125
2019
Q2 		$49K Buy
98
+97
+9,700% +$68.5K ﹤0.01% 3787
2019
Q1 		$1K Buy
+1
New +$929 ﹤0.01% 4646
2018
Q3 		– Sell
-156
Closed -$153K – 5166
2018
Q2 		$143K Buy
156
+126
+420% +$135K ﹤0.01% 3317
2018
Q1 		$30K Sell
30
-170
-85% -$155K ﹤0.01% 3907
2017
Q4 		$91K Buy
+200
New +$73.9K ﹤0.01% 3403
2016
Q2 		– Sell
-22
Closed -$11K – 4595
2016
Q1 		$11K Hold
22
– – ﹤0.01% 3974
2015
Q4 		$15K Buy
22
+12
+120% +$9.08K ﹤0.01% 4031
2015
Q3 		$8K Buy
+10
New +$12.2K ﹤0.01% 4360

Other funds holding ATRA

EC
EcoR1 Capital San Francisco, California $2.36B AUM 204.53% 1-Year Est. Return
RG
Redmile Group San Francisco, California $1.51B AUM 164.17% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return
GC
Globeflex Capital San Diego, California $783M AUM 81.58% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Mackenzie Financial
Mackenzie Financial Toronto Ontario, Ontario, Canada $100B AUM 36.93% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
SCA
STALEY CAPITAL ADVISERS Pittsburgh, Pennsylvania $2.57B AUM 26.96% 1-Year Est. Return

Group One Trading's ATRA Position: Q4 2025 in Review

Group One Trading sold out of Atara Biotherapeutics (ATRA) in Q4 2025, closing a stake of 148 shares — an estimated $2.12K sold.

Group One Trading first reported a position in ATRA in Q3 2015 and held it in 21 quarters. The position peaked at $248K in Q3 2021. 41 funds tracked by Wall St. Rank hold ATRA as of Q4 2025.

  • Group One Trading reported no remaining Atara Biotherapeutics position as of Q4 2025 after selling out during the quarter.
  • Group One Trading sold 148 Atara Biotherapeutics shares in Q4 2025, an estimated $2.12K.
  • Group One Trading first reported a position in Atara Biotherapeutics in Q3 2015 and held it in 21 quarters.
  • Group One Trading's Atara Biotherapeutics position peaked at $248K in Q3 2021.
  • 41 funds tracked by Wall St. Rank held Atara Biotherapeutics as of Q4 2025.

Based on Group One Trading's 13F filing for Q4 2025, filed 12 Feb 2026.