바이오젠(주)
US ˙ NasdaqGS ˙ US09062X1037

SecurityBIIB / Biogen Inc.
InstitutionInvesco Ltd.
Latest Disclosed Ownership1,745,255 shares
Latest Disclosed Value $ 319,957,584
Invesco Ltd. reports 5.43% increase in ownership of BIIB / Biogen Inc.

On May 12, 2026 - Invesco Ltd. filed a 13F-HR form disclosing ownership of 1,745,255 shares of Biogen Inc. (US:BIIB) valued at $319,957,599 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 19, 2026 disclosing 1,655,441 shares of Biogen Inc.. This represents a change in shares of 5.43% during the quarter. The current value of the position is $342,855,345 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-12 2026-03-31 13F BIOGEN COM 09062X103 1,745,255 89,814 5.43 319,958 9.82 0.0061
2026-02-19 2025-12-31 13F BIOGEN COM 09062X103 1,655,441 -762,686 -31.54 291,341 -13.99 0.0447
2025-11-13 2025-09-30 13F BIOGEN COM 09062X103 2,418,127 98,001 4.22 338,731 16.25 0.0534
2025-08-13 2025-06-30 13F BIOGEN COM 09062X103 2,320,126 55,119 2.43 291,385 -5.99 0.0496
2025-05-12 2025-03-31 13F BIOGEN COM 09062X103 2,265,007 136,200 6.40 309,944 -4.79 0.0587
2025-02-13 2024-12-31 13F BIOGEN COM 09062X103 2,128,807 499,074 30.62 325,537 3.05 0.0602
2024-11-12 2024-09-30 13F BIOGEN COM 09062X103 1,629,733 340,290 26.39 315,907 5.68 0.0610
2024-08-13 2024-06-30 13F BIOGEN COM 09062X103 1,289,443 -378,574 -22.70 298,919 -16.89 0.0632
2024-05-14 2024-03-31 13F BIOGEN COM 09062X103 1,668,017 -146,649 -8.08 359,675 -23.41 0.0773
2024-02-13 2023-12-31 13F BIOGEN COM 09062X103 1,814,666 633,292 53.61 469,581 54.66 0.1117
2023-11-13 2023-09-30 13F BIOGEN COM 09062X103 1,181,374 189,368 19.09 303,625 7.45 0.0818
2023-08-11 2023-06-30 13F BIOGEN COM 09062X103 992,006 -31,921 -3.12 282,573 -0.74 0.0741
2023-05-12 2023-03-31 13F BIOGEN COM 09062X103 1,023,927 103,448 11.24 284,682 11.68 0.0794
2023-02-13 2022-12-31 13F BIOGEN COM 09062X103 920,479 -50,297 -5.18 254,899 -1.66 0.0747
2022-11-14 2022-09-30 13F BIOGEN COM 09062X103 970,776 14,436 1.51 259,198 32.90 0.0834
2022-08-15 2022-06-30 13F BIOGEN COM 09062X103 956,340 1,931 0.20 195,036 -2.97 0.0591
2022-05-16 2022-03-31 13F BIOGEN COM 09062X103 954,409 -176,654 -15.62 200,996 -25.93 0.0513
2022-02-14 2021-12-31 13F BIOGEN COM 09062X103 1,131,063 140,484 14.18 271,365 -3.20 0.0654
2021-11-15 2021-09-30 13F BIOGEN COM 09062X103 990,579 -52,879 -5.07 280,324 -22.42 0.0710
2021-08-17 2021-06-30 13F BIOGEN COM 09062X103 1,043,458 9,417 0.91 361,318 24.91 0.0889
2021-05-17 2021-03-31 13F BIOGEN COM 09062X103 1,034,041 194,071 23.10 289,272 40.65 0.0772
2021-02-16 2020-12-31 13F BIOGEN COM 09062X103 839,970 -61,055 -6.78 205,675 -19.53 0.0599
2020-11-16 2020-09-30 13F BIOGEN COM 09062X103 901,025 -8,357 -0.92 255,602 5.05 0.0864
2020-08-14 2020-06-30 13F BIOGEN COM 09062X103 909,382 -34,958 -3.70 243,304 -18.56 0.0870
2020-05-15 2020-03-31 13F BIOGEN COM 09062X103 944,340 -149,289 -13.65 298,770 -7.93 0.1258
2020-02-14 2019-12-31 13F BIOGEN COM 09062X103 1,093,629 -1,774,755 -61.87 324,513 -51.41 0.1008
2019-11-14 2019-09-30 13F BIOGEN COM 09062X103 2,868,384 -124,426 -4.16 667,819 -4.59 0.1747
2019-08-14 2019-06-30 13F/A-1 BIOGEN COM 09062X103 2,992,810 -239,523 -7.41 699,930 -8.39 0.1801
2019-08-14 2019-06-30 13F BIOGEN COM 09062X103 2,992,810 -3,230,167 699,930
2019-05-15 2019-03-31 13F BIOGEN COM 09062X103 3,232,333 105,853 3.39 764,060 -18.79 0.2577
2019-02-14 2018-12-31 13F BIOGEN COM 09062X103 3,126,480 -482,787 -13.38 940,820 -26.22 0.3601
2018-11-14 2018-09-30 13F BIOGEN COM 09062X103 3,609,267 -251,090 -6.50 1,275,189 13.81 0.4013
2018-08-14 2018-06-30 13F BIOGEN COM 09062X103 3,860,357 303,388 8.53 1,120,433 15.04 0.3708
2018-05-15 2018-03-31 13F BIOGEN COM 09062X103 3,556,969 100,870 2.92 973,971 -11.54 0.3640
2018-02-14 2017-12-31 13F BIOGEN COM 09062X103 3,456,099 76,245 2.26 1,101,010 4.04 0.3970
2017-11-14 2017-09-30 13F BIOGEN COM 09062X103 3,379,854 -60,884 -1.77 1,058,300 13.35 0.3909
2017-08-14 2017-06-30 13F BIOGEN COM 09062X103 3,440,738 -696,208 -16.83 933,681 -17.46 0.2906
2017-05-15 2017-03-31 13F BIOGEN COM 09062X103 4,136,946 -110,936 -2.61 1,131,125 -6.10 0.3714
2017-02-14 2016-12-31 13F BIOGEN COM 09062X103 4,247,882 29,876 0.71 1,204,615 -8.77 0.4049
2016-11-14 2016-09-30 13F BIOGEN COM 09062X103 4,218,006 121,313 2.96 1,320,364 33.28 0.4537
2016-08-15 2016-06-30 13F BIOGEN COM 09062X103 4,096,693 481,145 13.31 990,661 5.26 0.3639
2016-05-16 2016-03-31 13F BIOGEN COM 09062X103 3,615,548 342,290 10.46 941,200 -6.14 0.3825
2016-02-16 2015-12-31 13F BIOGEN COM 09062X103 3,273,258 -160,773 -4.68 1,002,763 0.07 0.4001
2015-11-16 2015-09-30 13F BIOGEN COM 09062X103 3,434,031 153,640 4.68 1,002,085 -24.38 0.4251
2015-08-14 2015-06-30 13F BIOGEN COMMON 09062X103 3,280,391 -279,076 -7.84 1,325,081 -11.83 0.5200
2015-05-15 2015-03-31 13F BIOGEN COMMON 09062X103 3,559,467 216,716 6.48 1,502,950 32.45 0.5815
2015-02-13 2014-12-31 13F BIOGEN IDEC COMMON 09062X103 3,342,751 -235,680 -6.59 1,134,697 -4.15 0.4384
2014-11-14 2014-09-30 13F BIOGEN IDEC COMMON 09062X103 3,578,431 -248,736 -6.50 1,183,779 -1.90 0.4727
2014-08-14 2014-06-30 13F BIOGEN IDEC COMMON 09062X103 3,827,167 -224,517 -5.54 1,206,744 -2.63 0.4748
2014-05-15 2014-03-31 13F BIOGEN IDEC COMMON 09062X103 4,051,684 375,155 10.20 1,239,288 20.57 0.5028
2014-02-13 2013-12-31 13F BIOGEN IDEC COMMON 09062X103 3,676,529 -74,468 -1.99 1,027,855 13.82 0.4082
2013-11-13 2013-09-30 13F BIOGEN IDEC COMMON 09062X103 3,750,997 481,137 14.71 903,091 28.34 0.3925
2013-08-14 2013-06-30 13F BIOGEN IDEC COMMON 09062X103 3,269,860 3,269,860 703,673 0.3280
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.