Biogen Inc.
DE ˙ DB ˙ US09062X1037
162,20 € ↑3,64 (2,30%)
2026-06-03
DEL PRIS
SecurityDE:IDP / Biogen Inc.
InstitutionOssiam
Latest Disclosed Ownership40,960 shares
Latest Disclosed Value $ 7,509,197
Ossiam reports 34.21% decrease in ownership of IDP / Biogen Inc.

On May 14, 2026 - Ossiam filed a 13F-HR form disclosing ownership of 40,960 shares of Biogen Inc. (DE:IDP) valued at $6,359,040 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 62,263 shares of Biogen Inc.. This represents a change in shares of -34.21% during the quarter. The current value of the position is $6,643,712 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 40,960 -21,303 -34.21 7,509 -31.47 0.1321
2026-02-13 2025-12-31 13F BIOGEN COM 09062X103 62,263 -3,340 -5.09 10,958 19.24 0.2188
2025-11-14 2025-09-30 13F BIOGEN COM 09062X103 65,603 15,116 29.94 9,190 44.94 0.1183
2025-08-13 2025-06-30 13F BIOGEN COM 09062X103 50,487 -1,694 -3.25 6,341 -11.20 0.0713
2025-05-14 2025-03-31 13F BIOGEN COM 09062X103 52,181 1,818 3.61 7,140 -7.28 0.0997
2025-02-13 2024-12-31 13F BIOGEN COM 09062X103 50,363 2,653 5.56 7,702 -16.73 0.1330
2024-11-13 2024-09-30 13F BIOGEN COM 09062X103 47,710 6,759 16.51 9,248 -2.58 0.1788
2024-08-13 2024-06-30 13F BIOGEN COM 09062X103 40,951 15,637 61.77 9,493 73.93 0.1799
2024-05-13 2024-03-31 13F BIOGEN COM 09062X103 25,314 -3,306 -11.55 5,458 -26.29 0.0956
2024-02-13 2023-12-31 13F BIOGEN COM 09062X103 28,620 -4,746 -14.22 7,406 -13.64 0.1193
2023-11-14 2023-09-30 13F BIOGEN COM 09062X103 33,366 -20,280 -37.80 8,575 -43.88 0.1515
2023-08-11 2023-06-30 13F BIOGEN COM 09062X103 53,646 15,690 41.34 15,281 44.82 0.2745
2023-05-12 2023-03-31 13F BIOGEN COM 09062X103 37,956 127 0.34 10,553 0.74 0.2193
2023-02-13 2022-12-31 13F BIOGEN COM 09062X103 37,829 -22,831 -37.64 10,476 -35.32 0.2716
2022-11-14 2022-09-30 13F BIOGEN COM 09062X103 60,660 -3,802 -5.90 16,196 23.20 0.4691
2022-08-12 2022-06-30 13F BIOGEN COM 09062X103 64,462 5,393 9.13 13,146 5.68 0.3956
2022-05-13 2022-03-31 13F BIOGEN COM 09062X103 59,069 -11,044 -15.75 12,440 -26.05 0.3255
2022-02-14 2021-12-31 13F BIOGEN COM 09062X103 70,113 21,298 43.63 16,822 21.78 0.4408
2021-11-12 2021-09-30 13F BIOGEN COM 09062X103 48,815 7,989 19.57 13,814 3.56 0.3910
2021-08-13 2021-06-30 13F BIOGEN COM 09062X103 40,826 -19,934 -32.81 13,339 -21.53 0.3620
2021-05-17 2021-03-31 13F BIOGEN COM 09062X103 60,760 15,256 33.53 16,998 52.56 0.5292
2021-02-12 2020-12-31 13F BIOGEN COM 09062X103 45,504 -11,514 -20.19 11,142 -31.12 0.3888
2020-11-12 2020-09-30 13F BIOGEN COM 09062X103 57,018 1,892 3.43 16,175 9.67 0.6771
2020-08-13 2020-06-30 13F BIOGEN COM 09062X103 55,126 51,563 1,447.18 14,749 1,208.70 0.9430
2020-05-14 2020-03-31 13F BIOGEN COM 09062X103 3,563 3,275 1,137.15 1,127 1,225.88 0.0767
2020-02-14 2019-12-31 13F BIOGEN COM 09062X103 288 -4,919 -94.47 85 -92.99 0.0065
2019-11-13 2019-09-30 13F BIOGEN COM 09062X103 5,207 5,080 4,000.00 1,212 3,940.00 0.0845
2019-08-13 2019-06-30 13F BIOGEN COM 09062X103 127 -10,206 -98.77 30 -98.77 0.0023
2019-05-15 2019-03-31 13F BIOGEN COM 09062X103 10,333 1,378 15.39 2,443 -9.35 0.2016
2019-02-14 2018-12-31 13F BIOGEN COM 09062X103 8,955 8,955 2,695 0.4052
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.