State of Michigan Retirement System’s Biogen BIIB Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q2 | $9.42M | Buy |
43,603
+600
| +1% | +$115K | 0.04% | 324 |
|
|
2026
Q1 | $7.88M | Sell |
43,003
-100
| -0.2% | -$18.4K | 0.04% | 332 |
|
|
2025
Q4 | $7.59M | Hold |
43,103
| – | – | 0.04% | 336 |
|
|
2025
Q3 | $6.04M | Sell |
43,103
-248,200
| -85% | -$33.5M | 0.03% | 393 |
|
|
2025
Q2 | $36.6M | Buy |
291,303
+251,600
| +634% | +$31.3M | 0.19% | 102 |
|
|
2025
Q1 | $5.43M | Sell |
39,703
-23,800
| -37% | -$3.4M | 0.03% | 397 |
|
|
2024
Q4 | $9.71M | Buy |
63,503
+23,800
| +60% | +$4.01M | 0.05% | 282 |
|
|
2024
Q3 | $7.7M | Sell |
39,703
-200
| -0.5% | -$41.8K | 0.04% | 333 |
|
|
2024
Q2 | $9.25M | Buy |
39,903
+200
| +0.5% | +$43.5K | 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% | -$26.7K | 0.07% | 241 |
|
|
2023
Q2 | $11.3M | Sell |
39,803
-2,658
| -6% | -$791K | 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% | -$141K | 0.08% | 217 |
|
|
2022
Q3 | $11.4M | Sell |
42,561
-1,129
| -3% | -$240K | 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% | +$26.1K | 0.18% | 101 |
|
|
2021
Q4 | $34.9M | Buy |
145,541
+358
| +0.2% | +$92K | 0.18% | 98 |
|
|
2021
Q3 | $41.1M | Sell |
145,183
-500
| -0.3% | -$164K | 0.23% | 83 |
|
|
2021
Q2 | $50.4M | Sell |
145,683
-76,300
| -34% | -$23.1M | 0.3% | 78 |
|
|
2021
Q1 | $62.1M | Buy |
221,983
+104,200
| +88% | +$28.1M | 0.39% | 55 |
|
|
2020
Q4 | $28.8M | Sell |
117,783
-2,800
| -2% | -$722K | 0.2% | 116 |
|
|
2020
Q3 | $34.2M | Buy |
120,583
+3,700
| +3% | +$1.03M | 0.27% | 92 |
|
|
2020
Q2 | $31.3M | Buy |
116,883
+75,506
| +182% | +$22.7M | 0.27% | 90 |
|
|
2020
Q1 | $13.1M | Sell |
41,377
-2,300
| -5% | -$698K | 0.14% | 143 |
|
|
2019
Q4 | $13M | Sell |
43,677
-64,100
| -59% | -$17.8M | 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% | -$2.38M | 0.23% | 103 |
|
|
2019
Q1 | $28.4M | Sell |
120,077
-1,000
| -0.8% | -$315K | 0.23% | 104 |
|
|
2018
Q4 | $36.4M | Buy |
121,077
+61,100
| +102% | +$19.5M | 0.33% | 65 |
|
|
2018
Q3 | $21.2M | Sell |
59,977
-2,500
| -4% | -$861K | 0.16% | 130 |
|
|
2018
Q2 | $18.1M | Buy |
62,477
+200
| +0.3% | +$56.2K | 0.14% | 131 |
|
|
2018
Q1 | $17.1M | Buy |
62,277
+300
| +0.5% | +$93.1K | 0.14% | 135 |
|
|
2017
Q4 | $19.7M | Sell |
61,977
-2,200
| -3% | -$706K | 0.16% | 116 |
|
|
2017
Q3 | $20.1M | Sell |
64,177
-6,000
| -9% | -$1.78M | 0.16% | 116 |
|
|
2017
Q2 | $19M | Sell |
70,177
-700
| -1% | -$185K | 0.14% | 126 |
|
|
2017
Q1 | $19.4M | Sell |
70,877
-300
| -0.4% | -$84.8K | 0.15% | 117 |
|
|
2016
Q4 | $20.2M | Sell |
71,177
-5,324
| -7% | -$1.58M | 0.16% | 118 |
|
|
2016
Q3 | $23.9M | Buy |
76,501
+400
| +0.5% | +$118K | 0.19% | 101 |
|
|
2016
Q2 | $18.4M | Buy |
76,101
+800
| +1% | +$211K | 0.14% | 129 |
|
|
2016
Q1 | $19.6M | Sell |
75,301
-900
| -1% | -$238K | 0.16% | 117 |
|
|
2015
Q4 | $23.3M | Sell |
76,201
-8,700
| -10% | -$2.5M | 0.18% | 105 |
|
|
2015
Q3 | $24.8M | Sell |
84,901
-6,300
| -7% | -$2.08M | 0.19% | 96 |
|
|
2015
Q2 | $36.8M | Buy |
91,201
+700
| +0.8% | +$281K | 0.26% | 76 |
|
|
2015
Q1 | $38.2M | Sell |
90,501
-6,800
| -7% | -$2.68M | 0.27% | 71 |
|
|
2014
Q4 | $33M | Buy |
97,301
+500
| +0.5% | +$162K | 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% | +$211K | 0.21% | 87 |
|
|
2014
Q1 | $29.5M | Buy |
96,501
+500
| +0.5% | +$159K | 0.22% | 83 |
|
|
2013
Q4 | $26.9M | Sell |
96,001
-700
| -0.7% | -$181K | 0.21% | 89 |
|
|
2013
Q3 | $23.3M | Sell |
96,701
-147,700
| -60% | -$33.1M | 0.2% | 92 |
|
|
2013
Q2 | $52.6M | Buy |
+244,401
| New | +$52.2M | 0.48% | 50 |
|
Other funds holding BIIB
AIM
State of Michigan Retirement System's BIIB Position: Q2 2026 in Review
State of Michigan Retirement System increased its Biogen (BIIB) stake by 1.4% in Q2 2026, buying an estimated $115K and bringing the position to 43,603 shares worth $9.42M. The position accounts for 0.04% of the portfolio, ranked #324.
State of Michigan Retirement System first reported a position in BIIB in Q2 2013 and has held it in 53 quarters since. The position peaked at $62.1M in Q1 2021. 621 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.
- State of Michigan Retirement System held 43,603 shares of Biogen worth $9.42M as of Q2 2026.
- State of Michigan Retirement System bought 600 Biogen shares in Q2 2026, an estimated $115K.
- Biogen made up 0.04% of State of Michigan Retirement System's portfolio in Q2 2026, its #324 holding.
- State of Michigan Retirement System first reported a position in Biogen in Q2 2013 and has held it in 53 quarters since.
- State of Michigan Retirement System's Biogen position peaked at $62.1M in Q1 2021.
- 621 funds tracked by Wall St. Rank held Biogen as of Q2 2026.
Based on State of Michigan Retirement System's 13F filing for Q2 2026, filed 30 Jul 2026.