Ontario Teachers' Pension Plan Board’s Biogen BIIB Stock Holding History

Ontario Teachers' Pension Plan Board’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
2025 Q3	–	Sell	-5,786	Closed	-$727K	–	192
2025 Q2	$727K	Sell	5,786 -5,063	-47%	-$631K	0.02%	253
2025 Q1	$1.48M	Buy	+10,849	New	+$1.55M	0.02%	207
2023 Q3	–	Sell	-10,719	Closed	-$3.05M	–	506
2023 Q2	$3.05M	Buy	10,719 +7,717	+257%	+$2.3M	0.03%	117
2023 Q1	$835K	Sell	3,002 -7,136	-70%	-$1.97M	0.01%	359
2022 Q4	$2.81M	Sell	10,138 -3,087	-23%	-$872K	0.03%	130
2022 Q3	$3.53M	Buy	13,225 +10,930	+476%	+$2.32M	0.05%	82
2022 Q2	$468K	Sell	2,295 -2,414	-51%	-$493K	0.01%	358
2022 Q1	$992K	Buy	+4,709	New	+$1.02M	0.01%	210
2021 Q4	–	Sell	-3,826	Closed	-$1.08M	–	471
2021 Q3	$1.08M	Buy	3,826 +2,776	+264%	+$910K	﹤0.01%	190
2021 Q2	$364K	Sell	1,050 -1,583	-60%	-$480K	﹤0.01%	343
2021 Q1	$737K	Sell	2,633 -5,188	-66%	-$1.4M	0.01%	216
2020 Q4	$1.92M	Buy	7,821 +410	+6%	+$106K	0.02%	84
2020 Q3	$2.1M	Sell	7,411 -2,212	-23%	-$617K	0.03%	111
2020 Q2	$2.58M	Buy	9,623 +507	+6%	+$152K	0.05%	105
2020 Q1	$2.88M	Sell	9,116 -7,365	-45%	-$2.24M	0.08%	98
2019 Q4	$4.89M	Buy	16,481 +2,656	+19%	+$737K	0.09%	164
2019 Q3	$3.22M	Buy	13,825 +3,166	+30%	+$737K	0.06%	263
2019 Q2	$2.49M	Buy	+10,659	New	+$2.46M	0.05%	317
2019 Q1	–	Sell	-8,338	Closed	-$2.51M	–	555
2018 Q4	$2.51M	Buy	8,338 +2,135	+34%	+$681K	0.06%	217
2018 Q3	$2.19M	Sell	6,203 -6,244	-50%	-$2.15M	0.03%	311
2018 Q2	$3.61M	Sell	12,447 -3,425	-22%	-$963K	0.05%	250
2018 Q1	$4.35M	Buy	15,872 +7,687	+94%	+$2.39M	0.07%	231
2017 Q4	$2.61M	Buy	8,185 +1,778	+28%	+$570K	0.03%	377
2017 Q3	$2.01M	Sell	6,407 -3,241	-34%	-$960K	0.03%	395
2017 Q2	$2.62M	Buy	9,648 +4,350	+82%	+$1.15M	0.03%	377
2017 Q1	$1.45M	Buy	5,298 +2,083	+65%	+$589K	0.02%	440
2016 Q4	$912K	Buy	3,215 +440	+16%	+$130K	0.01%	487
2016 Q3	$869K	Buy	2,775 +488	+21%	+$145K	0.01%	490
2016 Q2	$553K	Sell	2,287 -322	-12%	-$84.9K	0.01%	529
2016 Q1	$679K	Buy	2,609 +173	+7%	+$45.7K	0.01%	491
2015 Q4	$746K	Buy	2,436 +290	+14%	+$83.3K	0.01%	473
2015 Q3	$626K	Sell	2,146 -39,363	-95%	-$13M	0.01%	513
2015 Q2	$16.8M	Hold	41,509	–	–	0.12%	136
2015 Q1	$17.5M	Hold	41,509	–	–	0.13%	116
2014 Q4	$14.1M	Buy	41,509 +505	+1%	+$163K	0.11%	130
2014 Q3	$13.6M	Buy	41,004 +3,108	+8%	+$1.02M	0.11%	130
2014 Q2	$11.9M	Buy	37,896 +566	+2%	+$170K	0.1%	135
2014 Q1	$11.4M	Sell	37,330 -8,453	-18%	-$2.68M	0.1%	144
2013 Q4	$12.8M	Sell	45,783 -9,912	-18%	-$2.56M	0.11%	140
2013 Q3	$13.4M	Buy	55,695 +167	+0.3%	+$37.4K	0.1%	152
2013 Q2	$11.9M	Buy	+55,528	New	+$11.9M	0.09%	163