California State Teachers Retirement System (CalSTRS)’s Biogen BIIB Stock Holding History

California State Teachers Retirement System (CalSTRS)’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	$40.5M	Sell	220,687 -5,693	-3%	-$1.05M	0.04%	329
2025 Q4	$39.8M	Sell	226,380 -8,438	-4%	-$1.38M	0.04%	345
2025 Q3	$32.9M	Sell	234,818 -3,873	-2%	-$524K	0.03%	395
2025 Q2	$30M	Buy	238,691 +8,156	+4%	+$1.02M	0.03%	409
2025 Q1	$31.5M	Sell	230,535 -2,783	-1%	-$398K	0.04%	377
2024 Q4	$35.7M	Buy	233,318 +2,811	+1%	+$474K	0.04%	355
2024 Q3	$44.7M	Sell	230,507 -428	-0.2%	-$89.5K	0.05%	317
2024 Q2	$53.5M	Buy	230,935 +3,863	+2%	+$840K	0.07%	275
2024 Q1	$49M	Buy	227,072 +650	+0.3%	+$152K	0.06%	290
2023 Q4	$58.6M	Buy	226,422 +89	+0%	+$21.9K	0.08%	235
2023 Q3	$58.2M	Sell	226,333 -7,220	-3%	-$1.93M	0.09%	209
2023 Q2	$66.5M	Sell	233,553 -14,231	-6%	-$4.24M	0.09%	197
2023 Q1	$68.9M	Sell	247,784 -3,738	-1%	-$1.03M	0.1%	185
2022 Q4	$69.7M	Buy	251,522 +1,384	+0.6%	+$391K	0.11%	181
2022 Q3	$66.8M	Sell	250,138 -1,924	-0.8%	-$409K	0.11%	171
2022 Q2	$51.4M	Sell	252,062 -4,681	-2%	-$957K	0.08%	230
2022 Q1	$54.1M	Sell	256,743 -17,102	-6%	-$3.72M	0.07%	258
2021 Q4	$65.7M	Buy	273,845 +7,466	+3%	+$1.92M	0.08%	239
2021 Q3	$75.4M	Buy	266,379 +2,137	+0.8%	+$700K	0.1%	187
2021 Q2	$91.5M	Sell	264,242 -30,775	-10%	-$9.32M	0.11%	155
2021 Q1	$82.5M	Sell	295,017 -1,489	-0.5%	-$402K	0.11%	157
2020 Q4	$72.6M	Sell	296,506 -39,337	-12%	-$10.1M	0.1%	167
2020 Q3	$95.3M	Sell	335,843 -20,466	-6%	-$5.71M	0.15%	120
2020 Q2	$95.3M	Sell	356,309 -19,486	-5%	-$5.86M	0.17%	111
2020 Q1	$119M	Sell	375,795 -14,354	-4%	-$4.36M	0.26%	73
2019 Q4	$116M	Buy	390,149 +51,682	+15%	+$14.3M	0.2%	95
2019 Q3	$78.8M	Sell	338,467 -12,443	-4%	-$2.9M	0.15%	131
2019 Q2	$82.1M	Buy	350,910 +1,012	+0.3%	+$234K	0.16%	118
2019 Q1	$82.7M	Buy	349,898 +2,388	+0.7%	+$752K	0.17%	112
2018 Q4	$105M	Buy	347,510 +21,342	+7%	+$6.81M	0.24%	80
2018 Q3	$115M	Sell	326,168 -14,802	-4%	-$5.1M	0.22%	80
2018 Q2	$99M	Sell	340,970 -298	-0.1%	-$83.8K	0.21%	88
2018 Q1	$93.4M	Sell	341,268 -11,551	-3%	-$3.59M	0.2%	97
2017 Q4	$112M	Sell	352,819 -5,241	-1%	-$1.68M	0.23%	84
2017 Q3	$112M	Sell	358,060 -34,074	-9%	-$10.1M	0.25%	82
2017 Q2	$106M	Sell	392,134 -43,827	-10%	-$11.6M	0.23%	87
2017 Q1	$119M	Sell	435,961 -20,000	-4%	-$5.65M	0.24%	83
2016 Q4	$129M	Sell	455,961 -12,200	-3%	-$3.62M	0.26%	73
2016 Q3	$147M	Buy	468,161 +3,900	+0.8%	+$1.16M	0.3%	59
2016 Q2	$112M	Sell	464,261 -9,316	-2%	-$2.46M	0.24%	81
2016 Q1	$123M	Buy	473,577 +60,510	+15%	+$16M	0.26%	73
2015 Q4	$127M	Sell	413,067 -15,850	-4%	-$4.55M	0.31%	61
2015 Q3	$125M	Sell	428,917 -700	-0.2%	-$231K	0.33%	58
2015 Q2	$174M	Sell	429,617 -4,990	-1%	-$2M	0.42%	44
2015 Q1	$184M	Sell	434,607 -7,500	-2%	-$2.96M	0.43%	43
2014 Q4	$150M	Buy	442,107 +4,172	+1%	+$1.35M	0.35%	50
2014 Q3	$145M	Buy	437,935 +4,486	+1%	+$1.48M	0.36%	48
2014 Q2	$137M	Buy	433,449 +1,600	+0.4%	+$482K	0.34%	49
2014 Q1	$132M	Buy	431,849 +2,100	+0.5%	+$667K	0.35%	52
2013 Q4	$120M	Buy	429,749 +2,900	+0.7%	+$750K	0.33%	55
2013 Q3	$103M	Buy	426,849 +13,205	+3%	+$2.96M	0.31%	59
2013 Q2	$89M	Buy	+413,644	New	+$88.4M	0.29%	61