Fidelity Investments’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 | $3.94B | Buy |
18,217,239
+5,409,698
| +42% | +$1.03B | 0.17% | 94 |
|
|
2026
Q1 | $2.35B | Buy |
12,807,541
+3,381,678
| +36% | +$623M | 0.12% | 133 |
|
|
2025
Q4 | $1.66B | Buy |
9,425,863
+8,138,103
| +632% | +$1.33B | 0.08% | 186 |
|
|
2025
Q3 | $180M | Sell |
1,287,760
-386,460
| -23% | -$52.2M | 0.01% | 896 |
|
|
2025
Q2 | $210M | Buy |
1,674,220
+365,392
| +28% | +$45.5M | 0.01% | 796 |
|
|
2025
Q1 | $179M | Buy |
1,308,828
+551,258
| +73% | +$78.8M | 0.01% | 836 |
|
|
2024
Q4 | $116M | Buy |
757,570
+376,356
| +99% | +$63.5M | 0.01% | 1057 |
|
|
2024
Q3 | $73.9M | Sell |
381,214
-229,202
| -38% | -$48M | ﹤0.01% | 1212 |
|
|
2024
Q2 | $142M | Sell |
610,416
-10,434
| -2% | -$2.27M | 0.01% | 911 |
|
|
2024
Q1 | $134M | Sell |
620,850
-380,294
| -38% | -$89.1M | 0.01% | 945 |
|
|
2023
Q4 | $259M | Sell |
1,001,144
-359,907
| -26% | -$88.4M | 0.02% | 648 |
|
|
2023
Q3 | $350M | Sell |
1,361,051
-1,279,470
| -48% | -$342M | 0.03% | 501 |
|
|
2023
Q2 | $752M | Buy |
2,640,521
+887,907
| +51% | +$264M | 0.06% | 282 |
|
|
2023
Q1 | $487M | Buy |
1,752,614
+541,421
| +45% | +$150M | 0.04% | 419 |
|
|
2022
Q4 | $335M | Sell |
1,211,193
-265,039
| -18% | -$74.9M | 0.03% | 523 |
|
|
2022
Q3 | $394M | Buy |
1,476,232
+450,066
| +44% | +$95.6M | 0.04% | 435 |
|
|
2022
Q2 | $209M | Buy |
1,026,166
+638,196
| +164% | +$130M | 0.02% | 662 |
|
|
2022
Q1 | $81.7M | Buy |
387,970
+200,669
| +107% | +$43.6M | 0.01% | 1159 |
|
|
2021
Q4 | $44.9M | Sell |
187,301
-990,252
| -84% | -$255M | ﹤0.01% | 1467 |
|
|
2021
Q3 | $333M | Sell |
1,177,553
-174,665
| -13% | -$57.2M | 0.03% | 589 |
|
|
2021
Q2 | $468M | Sell |
1,352,218
-562,998
| -29% | -$171M | 0.04% | 453 |
|
|
2021
Q1 | $536M | Sell |
1,915,216
-66,652
| -3% | -$18M | 0.05% | 412 |
|
|
2020
Q4 | $485M | Buy |
1,981,868
+897,042
| +83% | +$231M | 0.04% | 416 |
|
|
2020
Q3 | $308M | Sell |
1,084,826
-57,568
| -5% | -$16.1M | 0.03% | 461 |
|
|
2020
Q2 | $306M | Sell |
1,142,394
-1,045,442
| -48% | -$314M | 0.03% | 452 |
|
|
2020
Q1 | $692M | Buy |
2,187,836
+729,227
| +50% | +$221M | 0.1% | 199 |
|
|
2019
Q4 | $433M | Sell |
1,458,609
-261,063
| -15% | -$72.4M | 0.05% | 366 |
|
|
2019
Q3 | $400M | Sell |
1,719,672
-322,604
| -16% | -$75.1M | 0.05% | 377 |
|
|
2019
Q2 | $478M | Sell |
2,042,276
-509,390
| -20% | -$118M | 0.06% | 335 |
|
|
2019
Q1 | $603M | Sell |
2,551,666
-1,119,400
| -30% | -$352M | 0.07% | 265 |
|
|
2018
Q4 | $1.1B | Sell |
3,671,066
-651,121
| -15% | -$208M | 0.15% | 129 |
|
|
2018
Q3 | $1.53B | Sell |
4,322,187
-1,025,928
| -19% | -$353M | 0.17% | 106 |
|
|
2018
Q2 | $1.55B | Sell |
5,348,115
-1,422,922
| -21% | -$400M | 0.18% | 98 |
|
|
2018
Q1 | $1.85B | Sell |
6,771,037
-2,321,382
| -26% | -$721M | 0.22% | 89 |
|
|
2017
Q4 | $2.9B | Buy |
9,092,419
+1,940,450
| +27% | +$623M | 0.34% | 44 |
|
|
2017
Q3 | $2.24B | Buy |
7,151,969
+1,047,943
| +17% | +$310M | 0.27% | 65 |
|
|
2017
Q2 | $1.66B | Buy |
6,104,026
+561,436
| +10% | +$148M | 0.21% | 92 |
|
|
2017
Q1 | $1.52B | Sell |
5,542,590
-2,657,944
| -32% | -$752M | 0.19% | 98 |
|
|
2016
Q4 | $2.33B | Sell |
8,200,534
-1,518,017
| -16% | -$450M | 0.31% | 61 |
|
|
2016
Q3 | $3.04B | Sell |
9,718,551
-1,723,597
| -15% | -$510M | 0.41% | 43 |
|
|
2016
Q2 | $2.77B | Sell |
11,442,148
-2,050,916
| -15% | -$541M | 0.38% | 48 |
|
|
2016
Q1 | $3.51B | Buy |
13,493,064
+567,069
| +4% | +$150M | 0.49% | 36 |
|
|
2015
Q4 | $3.96B | Sell |
12,925,995
-3,637,805
| -22% | -$1.05B | 0.53% | 30 |
|
|
2015
Q3 | $4.83B | Sell |
16,563,800
-5,174,594
| -24% | -$1.71B | 0.69% | 19 |
|
|
2015
Q2 | $8.78B | Sell |
21,738,394
-302,757
| -1% | -$122M | 1.13% | 7 |
|
|
2015
Q1 | $9.31B | Buy |
22,041,151
+2,253,038
| +11% | +$888M | 1.19% | 4 |
|
|
2014
Q4 | $6.72B | Buy |
19,788,113
+785,319
| +4% | +$254M | 0.87% | 10 |
|
|
2014
Q3 | $6.29B | Sell |
19,002,794
-2,141,978
| -10% | -$706M | 0.85% | 8 |
|
|
2014
Q2 | $6.67B | Sell |
21,144,772
-780,556
| -4% | -$235M | 0.89% | 8 |
|
|
2014
Q1 | $6.71B | Sell |
21,925,328
-2,116,187
| -9% | -$672M | 0.93% | 10 |
|
|
2013
Q4 | $6.73B | Sell |
24,041,515
-1,598,992
| -6% | -$414M | 0.95% | 9 |
|
|
2013
Q3 | $6.17B | Buy |
25,640,507
+2,111,978
| +9% | +$473M | 0.95% | 6 |
|
|
2013
Q2 | $5.06B | Buy |
+23,528,529
| New | +$5.03B | 0.83% | 11 |
|
Other funds holding BIIB
Fidelity Investments's BIIB Position: Q2 2026 in Review
Fidelity Investments increased its Biogen (BIIB) stake by 42% in Q2 2026, buying an estimated $1.03B and bringing the position to 18,217,239 shares worth $3.94B. The position accounts for 0.17% of the portfolio, ranked #94.
Fidelity Investments first reported a position in BIIB in Q2 2013 and has held it in 53 quarters since. The position peaked at $9.31B in Q1 2015. 1,041 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.
- Fidelity Investments held 18,217,239 shares of Biogen worth $3.94B as of Q2 2026.
- Fidelity Investments bought 5,409,698 Biogen shares in Q2 2026, an estimated $1.03B.
- Biogen made up 0.17% of Fidelity Investments's portfolio in Q2 2026, its #94 holding.
- Fidelity Investments first reported a position in Biogen in Q2 2013 and has held it in 53 quarters since.
- Fidelity Investments's Biogen position peaked at $9.31B in Q1 2015.
- 1,041 funds tracked by Wall St. Rank held Biogen as of Q2 2026.
Based on Fidelity Investments's 13F filing for Q2 2026, filed 13 Aug 2026.