Biogen Inc.
DE ˙ DB ˙ US09062X1037
162,20 € ↑3,64 (2,30%)
2026-06-03
AKTIENPREIS
SecurityDE:IDP / Biogen Inc.
InstitutionAviva Plc
Latest Disclosed Ownership96,864 shares
Latest Disclosed Value $ 17,758,077
Aviva Plc reports 22.45% decrease in ownership of IDP / Biogen Inc.

On May 14, 2026 - Aviva Plc filed a 13F-HR form disclosing ownership of 96,864 shares of Biogen Inc. (DE:IDP) valued at $15,038,136 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 124,898 shares of Biogen Inc.. This represents a change in shares of -22.45% during the quarter. The current value of the position is $15,711,341 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)
2026-05-14 2026-03-31 13F BIOGEN COM 09062X103 96,864 -28,034 -22.45 17,758 -19.21 0.0298
2026-02-12 2025-12-31 13F BIOGEN COM 09062X103 124,898 9,192 7.94 21,981 35.61 0.0371
2025-11-13 2025-09-30 13F BIOGEN COM 09062X103 115,706 7,032 6.47 16,208 18.76 0.0295
2025-08-07 2025-06-30 13F BIOGEN COM 09062X103 108,674 6,945 6.83 13,648 -1.95 0.0282
2025-05-15 2025-03-31 13F BIOGEN COM 09062X103 101,729 13,998 15.96 13,921 3.76 0.0336
2025-02-13 2024-12-31 13F BIOGEN COM 09062X103 87,731 69,199 373.40 13,416 273.47 0.0348
2024-11-14 2024-09-30 13F BIOGEN COM 09062X103 18,532 258 1.41 3,592 -15.20 0.0093
2024-08-02 2024-06-30 13F BIOGEN COM 09062X103 18,274 -13,849 -43.11 4,236 -38.84 0.0117
2024-05-14 2024-03-31 13F BIOGEN COM 09062X103 32,123 -34,836 -52.03 6,927 -60.03 0.0228
2024-02-09 2023-12-31 13F BIOGEN COM 09062X103 66,959 17,770 36.13 17,327 37.05 0.0621
2023-11-13 2023-09-30 13F BIOGEN COM 09062X103 49,189 -8,072 -14.10 12,642 -22.49 0.0532
2023-08-10 2023-06-30 13F BIOGEN COM 09062X103 57,261 24,493 74.75 16,311 79.03 0.0664
2023-05-12 2023-03-31 13F BIOGEN COM 09062X103 32,768 -13,292 -28.86 9,110 -28.57 0.0413
2023-02-14 2022-12-31 13F/A-2 BIOGEN COM 09062X103 46,060 24,112 109.86 12,755 117.65 0.0627
2023-02-10 2022-12-31 13F/A-1 BIOGEN COM 09062X103 46,060 24,112 6,734 0.0321
2023-02-09 2022-12-31 13F BIOGEN COM 09062X103 46,060 24,112 13 0.0613
2022-11-14 2022-09-30 13F BIOGEN COM 09062X103 21,948 -3,138 -12.51 5,860 14.54 0.0338
2022-08-04 2022-06-30 13F BIOGEN COM 09062X103 25,086 -12,283 -32.87 5,116 -34.99 0.0272
2022-05-13 2022-03-31 13F BIOGEN COM 09062X103 37,369 -8,733 -18.94 7,870 -28.85 0.0393
2022-02-10 2021-12-31 13F BIOGEN COM 09062X103 46,102 -3,527 -7.11 11,061 -21.25 0.0464
2021-11-12 2021-09-30 13F BIOGEN COM 09062X103 49,629 1,069 2.20 14,045 -16.47 0.0626
2021-08-10 2021-06-30 13F BIOGEN COM 09062X103 48,560 -2,023 -4.00 16,815 18.83 0.0738
2021-05-13 2021-03-31 13F BIOGEN COM 09062X103 50,583 -1,610 -3.08 14,151 10.73 0.0691
2021-02-10 2020-12-31 13F BIOGEN COM 09062X103 52,193 1,188 2.33 12,780 -11.67 0.0665
2020-11-12 2020-09-30 13F BIOGEN COM 09062X103 51,005 -3,203 -5.91 14,469 -0.23 0.0853
2020-08-13 2020-06-30 13F/A-1 BIOGEN COM 09062X103 54,208 -6,890 -11.28 14,503 -24.97 0.0904
2020-08-13 2020-06-30 13F BIOGEN COM 09062X103 54,208 -6,890 14,503 43,906.8013
2020-05-14 2020-03-31 13F BIOGEN COM 09062X103 61,098 -2,738 -4.29 19,330 2.05 0.1416
2020-02-10 2019-12-31 13F BIOGEN COM 09062X103 63,836 -1,153 -1.77 18,942 25.19 0.1147
2019-11-12 2019-09-30 13F BIOGEN COM 09062X103 64,989 -7,132 -9.89 15,131 -10.29 0.1025
2019-07-30 2019-06-30 13F BIOGEN COM 09062X103 72,121 -2,337 -3.14 16,867 -4.16 0.1159
2019-05-14 2019-03-31 13F BIOGEN COM 09062X103 74,458 -1,567 -2.06 17,600 -23.07 0.1181
2019-02-12 2018-12-31 13F BIOGEN COM 09062X103 76,025 -21,516 -22.06 22,877 -33.62 0.1706
2018-11-13 2018-09-30 13F BIOGEN COM 09062X103 97,541 -8,962 -8.41 34,462 11.49 0.1889
2018-08-01 2018-06-30 13F BIOGEN COM 09062X103 106,503 -1,389 -1.29 30,911 4.63 0.1824
2018-05-14 2018-03-31 13F BIOGEN COM 09062X103 107,892 -10,095 -8.56 29,543 -21.40 0.1806
2018-02-13 2017-12-31 13F BIOGEN COM 09062X103 117,987 -17,373 -12.83 37,587 -11.27 0.2128
2017-11-13 2017-09-30 13F BIOGEN COM 09062X103 135,360 660 0.49 42,360 15.92 0.2280
2017-08-07 2017-06-30 13F BIOGEN COM 09062X103 134,700 260 0.19 36,541 -0.60 0.2042
2017-05-15 2017-03-31 13F BIOGEN COM 09062X103 134,440 -8,967 -6.25 36,763 -9.66 0.2104
2017-02-13 2016-12-31 13F BIOGEN COM 09062X103 143,407 218 0.15 40,693 -9.22 0.2431
2016-11-14 2016-09-30 13F BIOGEN COM 09062X103 143,189 -1,800 -1.24 44,824 27.83 0.2797
2016-08-05 2016-06-30 13F BIOGEN COM 09062X103 144,989 20,568 16.53 35,066 8.27 0.2403
2016-05-12 2016-03-31 13F BIOGEN COM 09062X103 124,421 -3,177 -2.49 32,389 -17.14 0.2407
2016-02-11 2015-12-31 13F BIOGEN COM 09062X103 127,598 -2,967 -2.27 39,089 2.60 0.2964
2015-11-12 2015-09-30 13F BIOGEN COM 09062X103 130,565 -13,193 -9.18 38,100 -34.39 0.3157
2015-08-06 2015-06-30 13F BIOGEN COM 09062X103 143,758 6,878 5.02 58,070 0.47 0.4108
2015-05-14 2015-03-31 13F BIOGEN IDEC COM 09062X103 136,880 136,880 0.00 57,796 0.3961
2015-02-05 2014-12-31 13F/A-1 BIOGEN IDEC COM 09062X103 0 -114,980 -100.00 0 -100.00
2014-11-13 2014-09-30 13F BIOGEN IDEC COM 09062X103 114,980 -638 -0.55 38,037 4.34 0.3011
2014-08-13 2014-06-30 13F BIOGEN IDEC COM 09062X103 115,618 53 0.05 36,456 3.13 0.2787
2014-05-14 2014-03-31 13F BIOGEN IDEC COM 09062X103 115,565 -917 -0.79 35,348 8.48 0.2864
2014-02-13 2013-12-31 13F BIOGEN IDEC COM 09062X103 116,482 36 0.03 32,586 16.23 0.2724
2013-11-13 2013-09-30 13F BIOGEN IDEC COM 09062X103 116,446 13,600 13.22 28,036 26.68 0.2459
2013-08-01 2013-06-30 13F BIOGEN IDEC COM 09062X103 102,846 102,846 22,132 0.2237
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.