D.E. Shaw & Co’s Biogen BIIB Stock Holding History

D.E. Shaw & Co’s Portfolio BIIB Stock Details BIIB Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	–	Sell	-53,754	Closed	-$9.9M	–	4565
2025 Q4	$9.46M	Sell	53,754 -424,170	-89%	-$69.3M	0.01%	1808
2025 Q3	$66.9M	Sell	477,924 -888,283	-65%	-$120M	0.05%	527
2025 Q2	$172M	Sell	1,366,207 -219,365	-14%	-$27.3M	0.17%	187
2025 Q1	$217M	Sell	1,585,572 -24,327	-2%	-$3.48M	0.26%	105
2024 Q4	$246M	Buy	1,609,899 +1,174,960	+270%	+$198M	0.27%	110
2024 Q3	$84.3M	Buy	434,939 +220,248	+103%	+$46.1M	0.11%	325
2024 Q2	$49.8M	Sell	214,691 -85,317	-28%	-$18.5M	0.07%	458
2024 Q1	$64.7M	Buy	300,008 +276,073	+1,153%	+$64.7M	0.08%	392
2023 Q4	$6.19M	Sell	23,935 -254,903	-91%	-$62.6M	0.01%	1740
2023 Q3	$71.7M	Sell	278,838 -567,606	-67%	-$152M	0.12%	313
2023 Q2	$241M	Sell	846,444 -487,546	-37%	-$145M	0.38%	66
2023 Q1	$371M	Sell	1,333,990 -422,092	-24%	-$117M	0.6%	24
2022 Q4	$486M	Buy	1,756,082 +220,767	+14%	+$62.4M	0.82%	8
2022 Q3	$410M	Buy	1,535,315 +179,461	+13%	+$38.1M	0.72%	15
2022 Q2	$277M	Buy	1,355,854 +361,974	+36%	+$74M	0.45%	29
2022 Q1	$209M	Buy	993,880 +396,919	+66%	+$86.3M	0.28%	84
2021 Q4	$143M	Buy	596,961 +220,470	+59%	+$56.7M	0.17%	177
2021 Q3	$107M	Sell	376,491 -413,202	-52%	-$135M	0.14%	230
2021 Q2	$273M	Buy	789,693 +180,453	+30%	+$54.7M	0.31%	69
2021 Q1	$170M	Sell	609,240 -78,553	-11%	-$21.2M	0.21%	118
2020 Q4	$168M	Buy	687,793 +319,901	+87%	+$82.5M	0.2%	132
2020 Q3	$104M	Sell	367,892 -475,814	-56%	-$133M	0.14%	209
2020 Q2	$226M	Buy	843,706 +427,363	+103%	+$128M	0.34%	57
2020 Q1	$132M	Sell	416,343 -1,167,480	-74%	-$354M	0.26%	95
2019 Q4	$470M	Sell	1,583,823 -1,085,030	-41%	-$301M	0.73%	15
2019 Q3	$621M	Buy	2,668,853 +95,877	+4%	+$22.3M	1%	8
2019 Q2	$602M	Buy	2,572,976 +1,524,355	+145%	+$352M	0.93%	11
2019 Q1	$248M	Buy	1,048,621 +651,468	+164%	+$205M	0.4%	53
2018 Q4	$120M	Sell	397,153 -46,678	-11%	-$14.9M	0.22%	133
2018 Q3	$157M	Buy	443,831 +108,002	+32%	+$37.2M	0.25%	108
2018 Q2	$97.5M	Sell	335,829 -619,096	-65%	-$174M	0.16%	186
2018 Q1	$261M	Buy	954,925 +478,787	+101%	+$149M	0.44%	48
2017 Q4	$152M	Sell	476,138 -133,795	-22%	-$42.9M	0.27%	96
2017 Q3	$191M	Sell	609,933 -695,925	-53%	-$206M	0.37%	62
2017 Q2	$354M	Sell	1,305,858 -253,197	-16%	-$67M	0.71%	18
2017 Q1	$426M	Sell	1,559,055 -252,028	-14%	-$71.3M	0.9%	11
2016 Q4	$514M	Buy	1,811,083 +199,699	+12%	+$59.2M	1.16%	5
2016 Q3	$504M	Sell	1,611,384 -4,266	-0.3%	-$1.26M	1.16%	7
2016 Q2	$391M	Sell	1,615,650 -612,567	-27%	-$161M	0.91%	8
2016 Q1	$580M	Buy	2,228,217 +135,608	+6%	+$35.8M	1.26%	4
2015 Q4	$641M	Buy	2,092,609 +1,494,231	+250%	+$429M	1.28%	2
2015 Q3	$175M	Buy	598,378 +448,869	+300%	+$148M	0.33%	80
2015 Q2	$60.4M	Sell	149,509 -763,424	-84%	-$306M	0.12%	263
2015 Q1	$385M	Buy	912,933 +712,993	+357%	+$281M	0.75%	21
2014 Q4	$67.9M	Sell	199,940 -4,381	-2%	-$1.42M	0.13%	270
2014 Q3	$67.6M	Buy	204,321 +191,657	+1,513%	+$63.2M	0.14%	266
2014 Q2	$3.99M	Sell	12,664 -314,750	-96%	-$94.7M	0.01%	1777
2014 Q1	$100M	Buy	327,414 +45,528	+16%	+$14.5M	0.21%	140
2013 Q4	$78.9M	Buy	281,886 +156,929	+126%	+$40.6M	0.18%	187
2013 Q3	$30.1M	Sell	124,957 -125,330	-50%	-$28M	0.08%	426
2013 Q2	$53.9M	Buy	+250,287	New	+$53.5M	0.16%	209