바이오젠(주)
MX ˙ BMV ˙ US09062X1037
SecurityMX:BIIB / Biogen Inc.
InstitutionUs Bancorp \de\
Latest Disclosed Ownership31,223 shares
Latest Disclosed Value $ 5,724,113
Us Bancorp \de\ reports 16.69% increase in ownership of BIIB / Biogen Inc.

On May 14, 2026 - Us Bancorp \de\ filed a 13F-HR form disclosing ownership of 31,223 shares of Biogen Inc. (MX:BIIB) valued at $5,724,113 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 26,757 shares of Biogen Inc.. This represents a change in shares of 16.69% during the quarter.

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.

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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)
2026-05-14 2026-03-31 13F BIOGEN COM 09062X103 31,223 4,466 16.69 5,724 21.58 0.0021
2026-01-30 2025-12-31 13F BIOGEN COM 09062X103 26,757 5,324 24.84 4,709 56.83 0.0055
2025-11-12 2025-09-30 13F BIOGEN COM 09062X103 21,433 4,324 25.27 3,002 39.76 0.0036
2025-07-24 2025-06-30 13F BIOGEN COM 09062X103 17,109 -8,837 -34.06 2,149 -39.49 0.0027
2025-05-08 2025-03-31 13F BIOGEN COM 09062X103 25,946 6,743 35.11 3,550 20.91 0.0047
2025-02-05 2024-12-31 13F BIOGEN COM 09062X103 19,203 -1,011 -5.00 2,937 -25.06 0.0038
2024-10-28 2024-09-30 13F BIOGEN COM 09062X103 20,214 -3,755 -15.67 3,918 -29.48 0.0050
2024-08-07 2024-06-30 13F BIOGEN COM 09062X103 23,969 6,393 36.37 5,556 46.63 0.0076
2024-05-08 2024-03-31 13F BIOGEN COM 09062X103 17,576 -2,648 -13.09 3,790 -27.59 0.0053
2024-02-09 2023-12-31 13F BIOGEN COM 09062X103 20,224 -680 -3.25 5,233 -2.59 0.0077
2023-11-03 2023-09-30 13F BIOGEN COM 09062X103 20,904 -2,480 -10.61 5,373 -19.34 0.0088
2023-08-10 2023-06-30 13F BIOGEN COM 09062X103 23,384 -893 -3.68 6,661 -1.32 0.0107
2023-05-09 2023-03-31 13F BIOGEN COMMON STOCK 09062X103 24,277 -1,753 -6.73 6,750 -6.37 0.0114
2023-02-13 2022-12-31 13F BIOGEN COMMON STOCK 09062X103 26,030 1,742 7.17 7,208 11.17 0.0128
2022-10-27 2022-09-30 13F BIOGEN COMMON STOCK 09062X103 24,288 -2,197 -8.30 6,484 20.03 0.0134
2022-08-01 2022-06-30 13F BIOGEN COMMON STOCK 09062X103 26,485 -3,746 -12.39 5,402 -15.14 0.0105
2022-05-11 2022-03-31 13F BIOGEN COMMON STOCK 09062X103 30,231 -6,006 -16.57 6,366 -26.79 0.0106
2022-02-11 2021-12-31 13F BIOGEN COMMON STOCK 09062X103 36,237 -9,593 -20.93 8,695 -32.95 0.0137
2021-11-10 2021-09-30 13F BIOGEN COMMON STOCK 09062X103 45,830 -2,234 -4.65 12,968 -22.08 0.0244
2021-08-05 2021-06-30 13F BIOGEN COMMON STOCK 09062X103 48,064 -10,560 -18.01 16,643 1.49 0.0312
2021-04-28 2021-03-31 13F BIOGEN COMMON STOCK 09062X103 58,624 -1,612 -2.68 16,399 11.19 0.0332
2021-02-04 2020-12-31 13F BIOGEN COMMON STOCK 09062X103 60,236 -6,325 -9.50 14,749 -21.89 0.0318
2020-11-10 2020-09-30 13F BIOGEN COMMON STOCK 09062X103 66,561 -5,004 -6.99 18,882 -1.39 0.0460
2020-08-07 2020-06-30 13F BIOGEN COMMON STOCK 09062X103 71,565 -3,587 -4.77 19,148 -19.47 0.0502
2020-05-13 2020-03-31 13F BIOGEN COMMON STOCK 09062X103 75,152 -14,230 -15.92 23,777 -10.35 0.0742
2020-02-04 2019-12-31 13F BIOGEN COMMON STOCK 09062X103 89,382 -26,786 -23.06 26,523 -1.93 0.0678
2019-11-08 2019-09-30 13F BIOGEN COMMON STOCK 09062X103 116,168 -10,700 -8.43 27,046 -8.84 0.0737
2019-08-13 2019-06-30 13F BIOGEN COMMON STOCK 09062X103 126,868 -34,914 -21.58 29,670 -22.42 0.0827
2019-05-08 2019-03-31 13F BIOGEN COMMON STOCK 09062X103 161,782 -903 -0.56 38,243 -21.88 0.1104
2019-02-13 2018-12-31 13F BIOGEN COMMON STOCK 09062X103 162,685 6,571 4.21 48,956 -11.24 0.1581
2018-10-31 2018-09-30 13F BIOGEN COMMON STOCK 09062X103 156,114 -10,651 -6.39 55,156 13.96 0.1597
2018-08-08 2018-06-30 13F BIOGEN COMMON STOCK 09062X103 166,765 1,464 0.89 48,401 6.93 0.1483
2018-05-08 2018-03-31 13F BIOGEN COMMON STOCK 09062X103 165,301 10,057 6.48 45,263 -8.48 0.1389
2018-02-02 2017-12-31 13F BIOGEN COMMON STOCK 09062X103 155,244 4,706 3.13 49,455 4.92 0.1512
2017-11-13 2017-09-30 13F BIOGEN COMMON STOCK 09062X103 150,538 17,172 12.88 47,136 30.25 0.1510
2017-07-19 2017-06-30 13F BIOGEN COMMON STOCK 09062X103 133,366 7,322 5.81 36,189 5.01 0.1208
2017-05-03 2017-03-31 13F BIOGEN COMMON STOCK 09062X103 126,044 -2,875 -2.23 34,462 -5.74 0.1181
2017-02-08 2016-12-31 13F BIOGEN COMMON STOCK 09062X103 128,919 3,388 2.70 36,559 -6.97 0.1315
2016-11-04 2016-09-30 13F BIOGEN COMMON STOCK 09062X103 125,531 8,044 6.85 39,296 38.32 0.1457
2016-08-10 2016-06-30 13F BIOGEN COMMON STOCK 09062X103 117,487 28,709 32.34 28,410 22.93 0.1081
2016-05-13 2016-03-31 13F BIOGEN COMMON STOCK 09062X103 88,778 17,635 24.79 23,110 6.04 0.0908
2016-02-10 2015-12-31 13F BIOGEN COMMON STOCK 09062X103 71,143 2,076 3.01 21,793 8.13 0.0877
2015-11-16 2015-09-30 13F BIOGEN COMMON STOCK 09062X103 69,067 9,213 15.39 20,154 -16.64 0.0845
2015-08-10 2015-06-30 13F BIOGEN COMMON STOCK 09062X103 59,854 3,872 6.92 24,177 2.28 0.0937
2015-05-08 2015-03-31 13F BIOGEN COMMON STOCK 09062X103 55,982 3,163 5.99 23,638 31.84 0.0908
2015-02-13 2014-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 52,819 11,231 27.01 17,929 30.32 0.0693
2014-11-14 2014-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 41,588 4,192 11.21 13,758 16.66 0.0557
2014-08-14 2014-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 37,396 4,600 14.03 11,793 17.57 0.0470
2014-05-14 2014-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 32,796 10,393 46.39 10,031 60.16 0.0411
2014-02-13 2013-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 22,403 7,225 47.60 6,263 71.40 0.0254
2013-11-07 2013-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 15,178 -1,167 -7.14 3,654 3.87 0.0161
2013-08-09 2013-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 16,345 16,345 3,518 0.0161
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.