Group One Trading
ATRA icon

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
2024
Q2 		– Sell
-196
Closed -$3.4K – 6691
2024
Q1 		$3.4K Sell
196
-1,908
-91% -$33.9K ﹤0.01% 6331
2023
Q4 		$27K Buy
2,104
+1,656
+370% +$38.6K ﹤0.01% 5518
2023
Q3 		$16.6K Buy
448
+408
+1,020% +$18.2K ﹤0.01% 6021
2023
Q2 		$1.61K Sell
40
-4
-9% -$226 ﹤0.01% 7148
2023
Q1 		$3.19K Buy
44
+4
+10% +$388 ﹤0.01% 6474
2022
Q4 		$3.28K Buy
40
+32
+400% +$3.33K ﹤0.01% 6506
2022
Q3 		$1K Sell
8
-1,992
-100% -$224K ﹤0.01% 7264
2022
Q2 		$390K Buy
2,000
+1,804
+920% +$294K ﹤0.01% 3653
2022
Q1 		$46K Sell
196
-20
-9% -$6.37K ﹤0.01% 6154
2021
Q4 		$85K Sell
216
-16
-7% -$6.74K ﹤0.01% 5868
2021
Q3 		$104K Buy
232
+228
+5,700% +$81.7K ﹤0.01% 5869
2021
Q2 		$2K Sell
4
-148
-97% -$52.8K ﹤0.01% 7918
2021
Q1 		$55K Sell
152
-28
-16% -$12.4K ﹤0.01% 6149
2020
Q4 		$88K Buy
180
+120
+200% +$55.4K ﹤0.01% 4659
2020
Q3 		$19K Buy
60
+36
+150% +$12.3K ﹤0.01% 5146
2020
Q2 		$9K Buy
24
+4
+20% +$1.01K ﹤0.01% 5148
2020
Q1 		$4K Buy
+20
New +$6.35K ﹤0.01% 4816
2019
Q4 		– Sell
-168
Closed -$59K – 5103
2019
Q3 		$59K Sell
168
-36
-18% -$13.4K ﹤0.01% 3896
2019
Q2 		$103K Buy
+204
New +$144K ﹤0.01% 3328
2018
Q3 		– Sell
-244
Closed -$224K – 5167
2018
Q2 		$224K Sell
244
-156
-39% -$168K ﹤0.01% 2968
2018
Q1 		$390K Sell
400
-1,600
-80% -$1.46M ﹤0.01% 2252
2017
Q4 		$905K Buy
+2,000
New +$739K 0.01% 1790
2017
Q3 		– Sell
-60
Closed -$21K – 4801
2017
Q2 		$21K Buy
+60
New +$23.1K ﹤0.01% 3927

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 $100B AUM 35.1% 1-Year Est. Return
GC
Globeflex Capital San Diego, California $661M AUM 50.59% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Mackenzie Financial
Mackenzie Financial Toronto Ontario, Ontario, Canada $83.3B AUM 31.19% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
SCA
STALEY CAPITAL ADVISERS Pittsburgh, Pennsylvania $2.36B AUM 23.72% 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.