SOMRS
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State of Michigan Retirement System’s Biogen BIIB Stock Holding History

Quarter Market Value Status Shares Shares
Change %
Trade Value Portfolio Weight Portfolio Position
2025
Q2
$36.6M Buy
291,303
+251,600
+634% +$31.6M 0.19% 102
2025
Q1
$5.43M Sell
39,703
-23,800
-37% -$3.26M 0.03% 397
2024
Q4
$9.71M Buy
63,503
+23,800
+60% +$3.64M 0.05% 282
2024
Q3
$7.7M Sell
39,703
-200
-0.5% -$38.8K 0.04% 333
2024
Q2
$9.25M Buy
39,903
+200
+0.5% +$46.4K 0.05% 283
2024
Q1
$8.56M Hold
39,703
0.05% 299
2023
Q4
$10.3M Hold
39,703
0.06% 254
2023
Q3
$10.2M Sell
39,703
-100
-0.3% -$25.7K 0.07% 241
2023
Q2
$11.3M Sell
39,803
-2,658
-6% -$757K 0.07% 226
2023
Q1
$11.8M Buy
42,461
+400
+1% +$111K 0.08% 219
2022
Q4
$11.6M Sell
42,061
-500
-1% -$138K 0.08% 217
2022
Q3
$11.4M Sell
42,561
-1,129
-3% -$301K 0.08% 201
2022
Q2
$8.91M Sell
43,690
-101,971
-70% -$20.8M 0.06% 254
2022
Q1
$30.7M Buy
145,661
+120
+0.1% +$25.3K 0.18% 101
2021
Q4
$34.9M Buy
145,541
+358
+0.2% +$85.9K 0.18% 98
2021
Q3
$41.1M Sell
145,183
-500
-0.3% -$141K 0.23% 83
2021
Q2
$50.4M Sell
145,683
-76,300
-34% -$26.4M 0.3% 78
2021
Q1
$62.1M Buy
221,983
+104,200
+88% +$29.2M 0.39% 55
2020
Q4
$28.8M Sell
117,783
-2,800
-2% -$686K 0.2% 116
2020
Q3
$34.2M Buy
120,583
+3,700
+3% +$1.05M 0.27% 92
2020
Q2
$31.3M Buy
116,883
+75,506
+182% +$20.2M 0.27% 90
2020
Q1
$13.1M Sell
41,377
-2,300
-5% -$728K 0.14% 143
2019
Q4
$13M Sell
43,677
-64,100
-59% -$19M 0.11% 173
2019
Q3
$25.1M Sell
107,777
-2,000
-2% -$466K 0.23% 108
2019
Q2
$25.7M Sell
109,777
-10,300
-9% -$2.41M 0.23% 103
2019
Q1
$28.4M Sell
120,077
-1,000
-0.8% -$236K 0.23% 104
2018
Q4
$36.4M Buy
121,077
+61,100
+102% +$18.4M 0.33% 65
2018
Q3
$21.2M Sell
59,977
-2,500
-4% -$883K 0.16% 130
2018
Q2
$18.1M Buy
62,477
+200
+0.3% +$58K 0.14% 131
2018
Q1
$17.1M Buy
62,277
+300
+0.5% +$82.1K 0.14% 135
2017
Q4
$19.7M Sell
61,977
-2,200
-3% -$701K 0.16% 116
2017
Q3
$20.1M Sell
64,177
-6,000
-9% -$1.88M 0.16% 116
2017
Q2
$19M Sell
70,177
-700
-1% -$190K 0.14% 126
2017
Q1
$19.4M Sell
70,877
-300
-0.4% -$82K 0.15% 117
2016
Q4
$20.2M Sell
71,177
-5,324
-7% -$1.51M 0.16% 118
2016
Q3
$23.9M Buy
76,501
+400
+0.5% +$125K 0.19% 101
2016
Q2
$18.4M Buy
76,101
+800
+1% +$193K 0.14% 129
2016
Q1
$19.6M Sell
75,301
-900
-1% -$234K 0.16% 117
2015
Q4
$23.3M Sell
76,201
-8,700
-10% -$2.67M 0.18% 105
2015
Q3
$24.8M Sell
84,901
-6,300
-7% -$1.84M 0.19% 96
2015
Q2
$36.8M Buy
91,201
+700
+0.8% +$283K 0.26% 76
2015
Q1
$38.2M Sell
90,501
-6,800
-7% -$2.87M 0.27% 71
2014
Q4
$33M Buy
97,301
+500
+0.5% +$170K 0.22% 83
2014
Q3
$32M Sell
96,801
-400
-0.4% -$132K 0.22% 76
2014
Q2
$30.6M Buy
97,201
+700
+0.7% +$221K 0.21% 87
2014
Q1
$29.5M Buy
96,501
+500
+0.5% +$153K 0.22% 83
2013
Q4
$26.9M Sell
96,001
-700
-0.7% -$196K 0.21% 89
2013
Q3
$23.3M Sell
96,701
-147,700
-60% -$35.6M 0.2% 92
2013
Q2
$52.6M Buy
+244,401
New +$52.6M 0.48% 50