Susquehanna International Group
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Susquehanna International Group’s Atara Biotherapeutics ATRA Stock Holding History

Susquehanna International Group’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
2021
Q1 		– Sell
-884
Closed -$434K – 12210
2020
Q4 		$434K Sell
884
-548
-38% -$253K ﹤0.01% 8577
2020
Q3 		$464K Sell
1,432
-16
-1% -$5.45K ﹤0.01% 7841
2020
Q2 		$527K Buy
1,448
+844
+140% +$213K ﹤0.01% 7251
2020
Q1 		$129K Sell
604
-2,916
-83% -$925K ﹤0.01% 9125
2019
Q4 		$1.45M Buy
3,520
+2,036
+137% +$702K ﹤0.01% 4855
2019
Q3 		$524K Sell
1,484
-248
-14% -$92.5K ﹤0.01% 7210
2019
Q2 		$871K Sell
1,732
-176
-9% -$124K ﹤0.01% 5990
2019
Q1 		$1.9M Buy
1,908
+748
+64% +$695K ﹤0.01% 3825
2018
Q4 		$1.01M Sell
1,160
-2,252
-66% -$2.09M ﹤0.01% 4646
2018
Q3 		$3.53M Sell
3,412
-800
-19% -$782K ﹤0.01% 3139
2018
Q2 		$3.87M Buy
4,212
+868
+26% +$932K ﹤0.01% 3045
2018
Q1 		$3.26M Buy
3,344
+1,248
+60% +$1.14M ﹤0.01% 3127
2017
Q4 		$948K Buy
+2,096
New +$774K ﹤0.01% 5343
2017
Q3 		– Sell
-888
Closed -$311K – 8779
2017
Q2 		$311K Buy
888
+400
+82% +$154K ﹤0.01% 7530
2017
Q1 		$251K Buy
+488
New +$202K ﹤0.01% 7662
2015
Q3 		– Sell
-628
Closed -$828K – 9607
2015
Q2 		$828K Buy
+628
New +$720K ﹤0.01% 6605

Other funds holding ATRA

Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $64.8B AUM 42.7% 1-Year Est. Return
RG
Redmile Group San Francisco, California $1.51B AUM 164.17% 1-Year Est. Return
Mackenzie Financial
Mackenzie Financial Toronto Ontario, Ontario, Canada $83.3B AUM 31.19% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Point72 Asset Management
Point72 Asset Management Stamford, Connecticut $78.1B AUM 55.25% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
EC
EcoR1 Capital San Francisco, California $2.36B AUM 204.53% 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 $1.61T AUM 30.72% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Susquehanna International Group's ATRA Position: Q1 2026 in Review

Susquehanna International Group sold out of Atara Biotherapeutics (ATRA) in Q1 2026, closing a stake of 14,018 shares — an estimated $254K sold.

Susquehanna International Group first reported a position in ATRA in Q4 2014 and held it in 27 quarters. The position peaked at $2M in Q4 2021. 33 funds tracked by Wall St. Rank hold ATRA as of Q1 2026.

  • Susquehanna International Group reported no remaining Atara Biotherapeutics position as of Q1 2026 after selling out during the quarter.
  • Susquehanna International Group sold 14,018 Atara Biotherapeutics shares in Q1 2026, an estimated $254K.
  • Susquehanna International Group first reported a position in Atara Biotherapeutics in Q4 2014 and held it in 27 quarters.
  • Susquehanna International Group's Atara Biotherapeutics position peaked at $2M in Q4 2021.
  • 33 funds tracked by Wall St. Rank held Atara Biotherapeutics as of Q1 2026.

Based on Susquehanna International Group's 13F filing for Q1 2026, filed 15 May 2026.