Biogen Inc.
GB ˙ LSE ˙ US09062X1037
197,61 $ ↓ -0,67 (-0,34%)
2026-06-05
DEL PRIS
SecurityGB:0R1B / Biogen Inc.
InstitutionProShare Advisors LLC
Latest Disclosed Ownership35,926 shares
Latest Disclosed Value $ 6,586,314
ProShare Advisors LLC reports 13.42% decrease in ownership of 0R1B / Biogen Inc.

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 35,926 shares of Biogen Inc. (GB:0R1B) valued at $6,436,143 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 41,496 shares of Biogen Inc.. This represents a change in shares of -13.42% during the quarter. The current value of the position is $7,099,337 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.

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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)
2026-04-24 2026-03-31 13F BIOGEN COM 09062X103 35,926 -5,570 -13.42 6,586 -9.81 0.0098
2026-02-06 2025-12-31 13F BIOGEN COM 09062X103 41,496 -155,668 -78.95 7,303 -73.56 0.0129
2025-11-06 2025-09-30 13F BIOGEN COM 09062X103 197,164 -41,394 -17.35 27,619 -7.82 0.0578
2025-08-07 2025-06-30 13F BIOGEN COM 09062X103 238,558 13,903 6.19 29,960 -2.54 0.0598
2025-05-08 2025-03-31 13F BIOGEN COM 09062X103 224,655 26,329 13.28 30,742 1.36 0.0694
2025-02-14 2024-12-31 13F BIOGEN COM 09062X103 198,326 29,294 17.33 30,328 -7.44 0.0693
2024-11-14 2024-09-30 13F BIOGEN COM 09062X103 169,032 11,404 7.23 32,765 -10.33 0.0803
2024-08-13 2024-06-30 13F BIOGEN COM 09062X103 157,628 -16,372 -9.41 36,541 -2.61 0.0978
2024-05-08 2024-03-31 13F BIOGEN COM 09062X103 174,000 29,890 20.74 37,520 0.61 0.0998
2024-02-14 2023-12-31 13F BIOGEN COM 09062X103 144,110 -24,291 -14.42 37,291 -13.84 0.1140
2023-11-13 2023-09-30 13F BIOGEN COM 09062X103 168,401 18,807 12.57 43,281 1.57 0.1349
2023-08-10 2023-06-30 13F BIOGEN COM 09062X103 149,594 -8,329 -5.27 42,612 -2.95 0.1236
2023-05-26 2023-03-31 13F/A-1 BIOGEN COM 09062X103 157,923 16,349 11.55 43,907 12.00 0.1342
2023-05-12 2023-03-31 13F BIOGEN COM 09062X103 157,923 16,349 43,907 0.1396
2023-02-02 2022-12-31 13F BIOGEN COM 09062X103 141,574 -14,664 -9.39 39,205 -6.02 0.1377
2022-11-07 2022-09-30 13F BIOGEN COM 09062X103 156,238 -31,426 -16.75 41,715 9.00 0.1601
2022-08-01 2022-06-30 13F BIOGEN COM 09062X103 187,664 -93,184 -33.18 38,272 -35.29 0.1269
2022-05-10 2022-03-31 13F BIOGEN COM 09062X103 280,848 -14,834 -5.02 59,147 -16.62 0.1271
2022-02-08 2021-12-31 13F BIOGEN COM 09062X103 295,682 81,691 38.17 70,940 17.15 0.1392
2021-11-12 2021-09-30 13F BIOGEN COM 09062X103 213,991 20,728 10.73 60,557 -9.51 0.1701
2021-08-13 2021-06-30 13F BIOGEN COM 09062X103 193,263 -8,014 -3.98 66,921 18.85 0.1956
2021-05-14 2021-03-31 13F BIOGEN COM 09062X103 201,277 23,338 13.12 56,307 29.23 0.1771
2021-02-09 2020-12-31 13F BIOGEN COM 09062X103 177,939 20,770 13.22 43,570 -2.28 0.1621
2020-11-13 2020-09-30 13F BIOGEN COM 09062X103 157,169 18,580 13.41 44,586 20.25 0.2061
2020-08-03 2020-06-30 13F BIOGEN COM 09062X103 138,589 -408 -0.29 37,079 -15.68 0.1981
2020-05-15 2020-03-31 13F BIOGEN COM 09062X103 138,997 -61,284 -30.60 43,976 -26.00 0.3160
2020-02-12 2019-12-31 13F BIOGEN COM 09062X103 200,281 20,543 11.43 59,429 42.01 0.2751
2019-11-12 2019-09-30 13F BIOGEN COM 09062X103 179,738 -2,521 -1.38 41,847 -1.83 0.2343
2019-08-13 2019-06-30 13F BIOGEN COM 09062X103 182,259 -35,890 -16.45 42,625 -17.34 0.2549
2019-05-15 2019-03-31 13F BIOGEN COM 09062X103 218,149 -648 -0.30 51,566 -21.68 0.3085
2019-02-14 2018-12-31 13F BIOGEN COM 09062X103 218,797 20,103 10.12 65,840 -6.21 0.4608
2018-11-14 2018-09-30 13F BIOGEN COM 09062X103 198,694 -32,114 -13.91 70,201 4.79 0.4766
2018-08-13 2018-06-30 13F BIOGEN COM 09062X103 230,808 -23,191 -9.13 66,990 -3.68 0.4490
2018-05-14 2018-03-31 13F BIOGEN COM 09062X103 253,999 32,376 14.61 69,550 -1.49 0.4531
2018-02-14 2017-12-31 13F BIOGEN COM 09062X103 221,623 33,133 17.58 70,602 19.62 0.4898
2017-11-13 2017-09-30 13F BIOGEN COM 09062X103 188,490 3,310 1.79 59,020 17.45 0.5424
2017-08-11 2017-06-30 13F BIOGEN COM 09062X103 185,180 20,557 12.49 50,250 11.64 0.5006
2017-05-12 2017-03-31 13F/A-2 BIOGEN COM 09062X103 164,623 -10,621 -6.06 45,011 -9.43 0.4708
2017-05-08 2017-03-31 13F/A-1 BIOGEN COM 09062X103 164,623 0 45,011 0.4706
2017-04-25 2017-03-31 13F BIOGEN COM 09062X103 164,623 45,011
2017-02-13 2016-12-31 13F BIOGEN COM 09062X103 175,244 22,837 14.98 49,696 4.17 0.5503
2016-11-10 2016-09-30 13F BIOGEN COM 09062X103 152,407 -51,839 -25.38 47,708 -3.41 0.6662
2016-08-12 2016-06-30 13F BIOGEN COM 09062X103 204,246 1,006 0.49 49,391 -6.65 0.6362
2016-05-06 2016-03-31 13F BIOGEN COM 09062X103 203,240 -72,372 -26.26 52,907 -37.34 0.7283
2016-02-05 2015-12-31 13F BIOGEN COM 09062X103 275,612 19,262 7.51 84,434 12.87 1.0228
2015-11-06 2015-09-30 13F BIOGEN COM 09062X103 256,350 38,263 17.54 74,805 -15.09 1.0506
2015-08-11 2015-06-30 13F BIOGEN COM 09062X103 218,087 -18,958 -8.00 88,094 -11.99 1.2190
2015-05-08 2015-03-31 13F BIOGEN COM 09062X103 237,045 237,045 0.00 100,090 1.1790
2015-01-30 2014-12-31 13F BIOGEN IDEC COM 09062X103 0 -160,151 -100.00 0 -100.00
2014-11-06 2014-09-30 13F BIOGEN IDEC COM 09062X103 160,151 1,340 0.84 52,980 5.80 0.7023
2014-08-08 2014-06-30 13F BIOGEN IDEC COM 09062X103 158,811 -30,187 -15.97 50,075 -13.38 0.6487
2014-05-07 2014-03-31 13F BIOGEN IDEC COM 09062X103 188,998 48,057 34.10 57,809 46.62 0.7230
2014-02-04 2013-12-31 13F BIOGEN IDEC COM 09062X103 140,941 46,366 49.03 39,428 73.16 0.5875
2013-11-07 2013-09-30 13F BIOGEN IDEC COM 09062X103 94,575 -1,625 -1.69 22,770 9.99 0.5404
2013-07-25 2013-06-30 13F BIOGEN IDEC COM 09062X103 96,200 96,200 20,702 0.4063
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.