XT
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XTX Topco’s Atara Biotherapeutics ATRA Stock Holding History

XTX Topco’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 		$176K Buy
+15,303
New +$122K ﹤0.01% 3310
2024
Q1 		– Sell
-1,422
Closed -$18.2K – 1830
2023
Q4 		$18.2K Buy
1,422
+52
+4% +$1.21K ﹤0.01% 1370
2023
Q3 		$50.7K Sell
1,370
-4,104
-75% -$183K 0.01% 1276
2023
Q2 		$220K Buy
+5,474
New +$310K 0.04% 943
2023
Q1 		– Sell
-1,146
Closed -$94K – 1264
2022
Q4 		$94K Sell
1,146
-5,514
-83% -$575K 0.02% 1007
2022
Q3 		$629K Buy
+6,660
New +$748K 0.16% 156
2022
Q2 		– Sell
-931
Closed -$216K – 842
2022
Q1 		$216K Buy
+931
New +$296K 0.09% 382
2021
Q2 		– Sell
-423
Closed -$152K – 803
2021
Q1 		$152K Buy
+423
New +$187K 0.07% 529

Other funds holding ATRA

EC
EcoR1 Capital San Francisco, California $2.06B AUM 215.32% 1-Year Est. Return
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return
Point72 Asset Management
Point72 Asset Management Stamford, Connecticut $90.7B AUM 77.13% 1-Year Est. Return
RG
Redmile Group San Francisco, California $1.49B AUM 208.7% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Mackenzie Financial
Mackenzie Financial Toronto Ontario, Ontario, Canada $100B AUM 36.93% 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
SCA
STALEY CAPITAL ADVISERS Pittsburgh, Pennsylvania $2.57B AUM 26.96% 1-Year Est. Return
Vanguard Fiduciary Trust
Vanguard Fiduciary Trust Malvern, Pennsylvania $454B AUM

XTX Topco's ATRA Position: Q2 2026 in Review

XTX Topco opened a new position in Atara Biotherapeutics (ATRA) in Q2 2026: 15,303 shares worth $176K. The stake represents ﹤0.01% of the portfolio and ranks #3310 among its holdings. This is a return to the name: XTX Topco previously reported a position in ATRA as recently as Q4 2023.

XTX Topco first reported a position in ATRA in Q1 2021 and has held it in 8 quarters since. The position peaked at $629K in Q3 2022. 36 funds tracked by Wall St. Rank hold ATRA as of Q2 2026.

  • XTX Topco held 15,303 shares of Atara Biotherapeutics worth $176K as of Q2 2026.
  • Atara Biotherapeutics was a new XTX Topco position in Q2 2026.
  • Atara Biotherapeutics made up ﹤0.01% of XTX Topco's portfolio in Q2 2026, its #3310 holding.
  • XTX Topco first reported a position in Atara Biotherapeutics in Q1 2021 and has held it in 8 quarters since.
  • XTX Topco's Atara Biotherapeutics position peaked at $629K in Q3 2022.
  • 36 funds tracked by Wall St. Rank held Atara Biotherapeutics as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.