Biogen Inc.
GB ˙ LSE ˙ US09062X1037
195,00 $ ↓ -2,22 (-1,13%)
2026-06-01
DEL PRIS
SecurityGB:0R1B / Biogen Inc.
InstitutionAllstate Corp
Latest Disclosed Ownership17,555 shares
Latest Disclosed Value $ 3,218,358
Allstate Corp reports 81.50% increase in ownership of 0R1B / Biogen Inc.

On May 11, 2026 - Allstate Corp filed a 13F-HR form disclosing ownership of 17,555 shares of Biogen Inc. (GB:0R1B) valued at $3,144,978 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 9,672 shares of Biogen Inc.. This represents a change in shares of 81.50% during the quarter. The current value of the position is $3,423,225 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)
2026-05-11 2026-03-31 13F BIOGEN ORD Equity 09062X103 17,555 7,883 81.50 3,218 89.07 0.0318
2026-02-09 2025-12-31 13F BIOGEN ORD Equity 09062X103 9,672 4,972 105.79 1,702 158.66 0.0233
2025-10-29 2025-09-30 13F BIOGEN ORD Equity 09062X103 4,700 4,700 658 0.0150
2025-08-05 2025-06-30 13F BIOGEN ORD Equity 09062X103 0 -4,589 -100.00 0 -100.00
2025-05-14 2025-03-31 13F BIOGEN ORD Equity 09062X103 4,589 291 6.77 628 -4.57 0.0185
2025-02-12 2024-12-31 13F BIOGEN ORD Equity 09062X103 4,298 4,298 657 0.0194
2023-05-10 2023-03-31 13F BIOGEN EQU 09062X103 0 -5,784 -100.00 0 -100.00
2023-02-14 2022-12-31 13F BIOGEN EQU 09062X103 5,784 2,639 83.91 1,602 90.60 0.0487
2022-11-14 2022-09-30 13F BIOGEN EQU 09062X103 3,145 -2,674 -45.95 840 -29.23 0.0242
2022-08-15 2022-06-30 13F BIOGEN EQU 09062X103 5,819 -1,749 -23.11 1,187 -25.53 0.0365
2022-05-16 2022-03-31 13F BIOGEN EQU 09062X103 7,568 5,186 217.72 1,594 179.16 0.0426
2022-02-15 2021-12-31 13F BIOGEN EQU 09062X103 2,382 -396 -14.25 571 -27.35 0.0109
2021-11-15 2021-09-30 13F BIOGEN EQU 09062X103 2,778 -117 -4.04 786 -21.56 0.0325
2021-08-16 2021-06-30 13F BIOGEN EQU 09062X103 2,895 36 1.26 1,002 25.25 0.0336
2021-05-14 2021-03-31 13F BIOGEN EQU 09062X103 2,859 317 12.47 800 28.62 0.0251
2021-02-12 2020-12-31 13F BIOGEN EQU 09062X103 2,542 -45 -1.74 622 -15.26 0.0193
2020-11-13 2020-09-30 13F BIOGEN EQU 09062X103 2,587 -2,090 -44.69 734 -41.33 0.0238
2020-08-13 2020-06-30 13F BIOGEN EQU 09062X103 4,677 -726 -13.44 1,251 -26.80 0.0430
2020-05-15 2020-03-31 13F BIOGEN COMMON 09062X103 5,403 -11,496 -68.03 1,709 -65.92 0.0669
2020-02-14 2019-12-31 13F BIOGEN COMMON 09062X103 16,899 1,212 7.73 5,014 37.29 0.0910
2019-11-14 2019-09-30 13F BIOGEN COMMON 09062X103 15,687 1,135 7.80 3,652 7.32 0.0628
2019-08-14 2019-06-30 13F BIOGEN COMMON 09062X103 14,552 -1,266 -8.00 3,403 -8.99 0.0608
2019-05-20 2019-03-31 13F BIOGEN COMMON 09062X103 15,818 407 2.64 3,739 -19.37 0.1008
2019-02-13 2018-12-31 13F BIOGEN COMMON 09062X103 15,411 15,411 4,637 0.1523
2017-11-14 2017-09-30 13F BIOGEN COMMON 09062X103 0 -7,878 -100.00 0 -100.00
2017-08-14 2017-06-30 13F BIOGEN COMMON 09062X103 7,878 0 0.00 2,138 -0.74 0.1136
2017-05-15 2017-03-31 13F BIOGEN COMMON 09062X103 7,878 -9,407 -54.42 2,154 -56.06 0.1305
2017-02-14 2016-12-31 13F BIOGEN COMMON 09062X103 17,285 17,285 4,902 0.2931
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.