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
2024
Q3 		– Sell
-9,600
Closed -$81.6K – 6623
2024
Q2 		$81.6K Buy
9,600
+9,216
+2,400% +$139K ﹤0.01% 4126
2024
Q1 		$6.66K Sell
384
-996
-72% -$17.7K ﹤0.01% 6070
2023
Q4 		$17.7K Sell
1,380
-9,296
-87% -$217K ﹤0.01% 5839
2023
Q3 		$395K Sell
10,676
-6,076
-36% -$270K ﹤0.01% 3149
2023
Q2 		$674K Sell
16,752
-8,332
-33% -$471K ﹤0.01% 2721
2023
Q1 		$1.82M Sell
25,084
-4,496
-15% -$436K 0.01% 1611
2022
Q4 		$2.43M Buy
29,580
+29,412
+17,507% +$3.06M 0.01% 1666
2022
Q3 		$16K Sell
168
-328
-66% -$36.8K ﹤0.01% 6206
2022
Q2 		$97K Sell
496
-500
-50% -$81.6K ﹤0.01% 5011
2022
Q1 		$231K Buy
996
+736
+283% +$234K ﹤0.01% 4647
2021
Q4 		$102K Sell
260
-196
-43% -$82.5K ﹤0.01% 5703
2021
Q3 		$204K Buy
456
+308
+208% +$110K ﹤0.01% 5147
2021
Q2 		$58K Sell
148
-116
-44% -$41.4K ﹤0.01% 6449
2021
Q1 		$95K Sell
264
-404
-60% -$179K ﹤0.01% 5705
2020
Q4 		$328K Sell
668
-64
-9% -$29.5K ﹤0.01% 3656
2020
Q3 		$237K Buy
732
+208
+40% +$70.8K ﹤0.01% 3518
2020
Q2 		$191K Buy
524
+120
+30% +$30.3K ﹤0.01% 3416
2020
Q1 		$86K Sell
404
-568
-58% -$180K ﹤0.01% 3403
2019
Q4 		$400K Sell
972
-108
-10% -$37.2K ﹤0.01% 2622
2019
Q3 		$381K Buy
1,080
+288
+36% +$107K ﹤0.01% 2561
2019
Q2 		$398K Buy
+792
New +$559K ﹤0.01% 2340
2018
Q4 		– Sell
-320
Closed -$331K – 4855
2018
Q3 		$331K Hold
320
– – ﹤0.01% 2622
2018
Q2 		$294K Buy
320
+260
+433% +$279K ﹤0.01% 2740
2018
Q1 		$59K Buy
+60
New +$54.7K ﹤0.01% 3570

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.