Biogen Inc.
US ˙ NasdaqGS ˙ US09062X1037

SecurityBIIB / Biogen Inc.
InstitutionCENTRAL TRUST Co
Latest Disclosed Ownership163 shares
Latest Disclosed Value $ 29,883
CENTRAL TRUST Co ownership in BIIB / Biogen Inc.

On April 17, 2026 - CENTRAL TRUST Co filed a 13F-HR form disclosing ownership of 163 shares of Biogen Inc. (US:BIIB) valued at $29,883 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 163 shares of Biogen Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $31,941 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)
2026-04-17 2026-03-31 13F BIOGEN COM 09062X103 163 0 0.00 30 3.57 0.0006
2026-02-02 2025-12-31 13F BIOGEN COM 09062X103 163 0 0.00 29 27.27 0.0006
2025-11-06 2025-09-30 13F BIOGEN COM 09062X103 163 0 0.00 23 10.00 0.0005
2025-08-07 2025-06-30 13F BIOGEN COM 09062X103 163 -40 -19.70 20 -25.93 0.0005
2025-04-18 2025-03-31 13F BIOGEN COM 09062X103 203 30 17.34 28 3.85 0.0007
2025-01-24 2024-12-31 13F BIOGEN COM 09062X103 173 -60 -25.75 26 -42.22 0.0006
2024-10-22 2024-09-30 13F BIOGEN COM 09062X103 233 -3 -1.27 45 -16.67 0.0011
2024-08-05 2024-06-30 13F BIOGEN COM 09062X103 236 3 1.29 55 8.00 0.0013
2024-04-24 2024-03-31 13F BIOGEN COM 09062X103 233 0 0.00 50 -16.67 0.0013
2024-01-24 2023-12-31 13F BIOGEN COM 09062X103 233 0 0.00 60 1.69 0.0016
2023-10-26 2023-09-30 13F BIOGEN COM 09062X103 233 -405 -63.48 60 -67.40 0.0017
2023-07-26 2023-06-30 13F BIOGEN COM 09062X103 638 0 0.00 182 2.26 0.0051
2023-04-19 2023-03-31 13F BIOGEN COM 09062X103 638 245 62.34 177 63.89 0.0052
2023-01-26 2022-12-31 13F BIOGEN COM 09062X103 393 -200 -33.73 109 -31.65 0.0034
2022-11-17 2022-09-30 13F/A-2 BIOGEN COM 09062X103 593 -25 -4.05 158 25.40 0.0054
2022-11-04 2022-09-30 13F/A-1 BIOGEN COM 09062X103 618 0 126 0.0023
2022-11-03 2022-09-30 13F BIOGEN COM 09062X103 618 0 126 0.0023
2022-08-09 2022-06-30 13F BIOGEN COM 09062X103 618 0 0.00 126 -3.08 0.0042
2022-05-03 2022-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 618 -20 -3.13 130 -15.03 0.0037
2022-02-08 2021-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 638 -175 -21.53 153 -33.48 0.0043
2021-10-19 2021-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 813 -26 -3.10 230 -20.96 0.0082
2021-07-23 2021-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 839 -110 -11.59 291 9.81 0.0106
2021-04-23 2021-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 949 110 13.11 265 29.27 0.0104
2021-01-29 2020-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 839 0 0.00 205 -13.87 0.0084
2020-10-22 2020-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 839 14 1.70 238 7.69 0.0108
2020-07-14 2020-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 825 -45 -5.17 221 -19.64 0.0111
2020-04-17 2020-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 870 -5 -0.57 275 5.77 0.0168
2020-01-21 2019-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 875 0 0.00 260 27.45 0.0133
2019-10-28 2019-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 875 -549 -38.55 204 -38.18 0.0115
2019-07-12 2019-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 1,424 -2,980 -67.67 330 -68.30 0.0188
2019-04-26 2019-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 4,404 -149 -3.27 1,041 -24.07 0.0621
2019-01-08 2018-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 4,553 150 3.41 1,371 -11.83 0.0911
2018-10-04 2018-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 4,403 5 0.11 1,555 21.87 0.0904
2018-07-09 2018-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 4,398 -157 -3.45 1,276 2.24 0.0814
2018-04-04 2018-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 4,555 32 0.71 1,248 -13.39 0.0792
2018-01-23 2017-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 4,523 116 2.63 1,441 4.42 0.0877
2017-10-17 2017-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 4,407 55 1.26 1,380 16.85 0.0892
2017-07-14 2017-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 4,352 1,050 31.80 1,181 30.79 0.0781
2017-04-06 2017-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 3,302 -630 -16.02 903 -19.01 0.0601
2017-01-24 2016-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 3,932 -3,351 -46.01 1,115 -51.08 0.0768
2016-10-24 2016-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 7,283 4,737 186.06 2,279 269.97 0.1662
2016-08-08 2016-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 2,546 -194 -7.08 616 -13.60 0.0461
2016-04-11 2016-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 2,740 576 26.62 713 7.54 0.0563
2016-01-21 2015-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 2,164 414 23.66 663 29.75 0.0548
2015-10-14 2015-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 1,750 -9,333 -84.21 511 -88.59 0.0445
2015-07-28 2015-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 11,083 -827 -6.94 4,477 -10.98 0.3520
2015-04-09 2015-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 11,910 3,408 40.08 5,029 74.26 0.4047
2015-01-16 2014-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 8,502 -566 -6.24 2,886 -3.77 0.2351
2014-10-23 2014-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 9,068 -127 -1.38 2,999 3.41 0.2383
2014-07-09 2014-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 9,195 -52 -0.56 2,900 2.51 1.3745
2014-05-07 2014-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 9,247 415 4.70 2,829 14.58 0.2339
2014-01-27 2013-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 8,832 1,654 23.04 2,469 42.88 0.2070
2013-10-24 2013-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 7,178 66 0.93 1,728 12.87 0.1565
2013-08-13 2013-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 7,112 7,112 1,531 0.1453
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.