Cubist Systematic Strategies’s Atara Biotherapeutics ATRA Stock Holding History

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q1	–	Sell	-12,682	Closed	-$169K	–	2886
2024 Q4	$169K	Buy	+12,682	New	+$134K	﹤0.01%	2616
2024 Q3	–	Sell	-9,271	Closed	-$78.8K	–	3022
2024 Q2	$78.8K	Buy	+9,271	New	+$139K	﹤0.01%	2659
2024 Q1	–	Sell	-1,458	Closed	-$18.7K	–	3718
2023 Q4	$18.7K	Sell	1,458 -320	-18%	-$7.46K	﹤0.01%	3357
2023 Q3	$65.8K	Sell	1,778 -9,285	-84%	-$413K	﹤0.01%	2997
2023 Q2	$445K	Buy	11,063 +2,889	+35%	+$163K	﹤0.01%	2464
2023 Q1	$593K	Buy	8,174 +916	+13%	+$88.8K	0.01%	2563
2022 Q4	$595K	Buy	7,258 +6,239	+612%	+$650K	0.01%	2899
2022 Q3	$96K	Sell	1,019 -9	-0.9%	-$1.01K	﹤0.01%	4027
2022 Q2	$200K	Sell	1,028 -1,778	-63%	-$290K	﹤0.01%	3702
2022 Q1	$652K	Buy	2,806 +2,053	+273%	+$654K	0.01%	2367
2021 Q4	$297K	Buy	753 +51	+7%	+$21.5K	﹤0.01%	2805
2021 Q3	$314K	Sell	702 -792	-53%	-$284K	﹤0.01%	2328
2021 Q2	$581K	Sell	1,494 -2,644	-64%	-$943K	0.01%	1909
2021 Q1	$1.49M	Buy	4,138 +1,841	+80%	+$814K	0.02%	1256
2020 Q4	$1.13M	Buy	2,297 +1,780	+344%	+$822K	0.02%	1310
2020 Q3	$167K	Buy	517 +260	+101%	+$88.5K	﹤0.01%	2178
2020 Q2	$94K	Sell	257 -1,301	-84%	-$329K	﹤0.01%	2203
2020 Q1	$331K	Buy	+1,558	New	+$494K	0.01%	1465
2019 Q4	–	Sell	-2,510	Closed	-$886K	–	2408
2019 Q3	$886K	Buy	2,510 +695	+38%	+$259K	0.02%	1033
2019 Q2	$912K	Buy	+1,815	New	+$1.28M	0.02%	1100
2019 Q1	–	Sell	-53	Closed	-$46K	–	2238
2018 Q4	$46K	Buy	+53	New	+$49.2K	﹤0.01%	1878
2015 Q2	–	Sell	-69	Closed	-$71K	–	1817
2015 Q1	$71K	Sell	69 -345	-83%	-$228K	﹤0.01%	1711
2014 Q4	$277K	Buy	+414	New	+$253K	0.02%	1279