Biogen Inc.
US ˙ NasdaqGS ˙ US09062X1037

SecurityBIIB / Biogen Inc.
InstitutionSignaturefd, Llc
Latest Disclosed Ownership4,608 shares
Latest Disclosed Value $ 844,728
Signaturefd, Llc reports 5.45% increase in ownership of BIIB / Biogen Inc.

On April 7, 2026 - Signaturefd, Llc filed a 13F-HR form disclosing ownership of 4,608 shares of Biogen Inc. (US:BIIB) valued at $844,785 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 4,370 shares of Biogen Inc.. This represents a change in shares of 5.45% during the quarter. The current value of the position is $900,127 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)
2026-04-07 2026-03-31 13F BIOGEN COM 09062X103 4,608 238 5.45 845 9.75 0.0129
2026-01-20 2025-12-31 13F BIOGEN COM 09062X103 4,370 28 0.64 769 26.48 0.0117
2025-10-21 2025-09-30 13F BIOGEN COM 09062X103 4,342 -229 -5.01 608 5.92 0.0096
2025-07-16 2025-06-30 13F BIOGEN COM 09062X103 4,571 1,874 69.48 574 55.56 0.0098
2025-05-02 2025-03-31 13F BIOGEN COM 09062X103 2,697 605 28.92 369 15.67 0.0070
2025-02-10 2024-12-31 13F BIOGEN COM 09062X103 2,092 71 3.51 320 -18.41 0.0061
2024-10-21 2024-09-30 13F BIOGEN COM 09062X103 2,021 -1,277 -38.72 392 -48.82 0.0075
2024-07-29 2024-06-30 13F BIOGEN COM 09062X103 3,298 1,310 65.90 765 78.50 0.0155
2024-05-03 2024-03-31 13F BIOGEN COM 09062X103 1,988 -181 -8.34 429 -23.71 0.0091
2024-02-01 2023-12-31 13F BIOGEN COM 09062X103 2,169 -37 -1.68 561 -0.88 0.0130
2023-11-03 2023-09-30 13F BIOGEN COM 09062X103 2,206 -349 -13.66 567 -22.15 0.0148
2023-08-01 2023-06-30 13F BIOGEN COM 09062X103 2,555 162 6.77 728 9.32 0.0186
2023-04-28 2023-03-31 13F BIOGEN COM 09062X103 2,393 -73 -2.96 665 -2.49 0.0182
2023-01-30 2022-12-31 13F BIOGEN COM 09062X103 2,466 733 42.30 683 47.30 0.0200
2022-11-08 2022-09-30 13F BIOGEN COM 09062X103 1,733 -84 -4.62 463 24.80 0.0159
2022-08-10 2022-06-30 13F BIOGEN COM 09062X103 1,817 -64 -3.40 371 -6.31 0.0126
2022-05-02 2022-03-31 13F BIOGEN COM 09062X103 1,881 -304 -13.91 396 -24.43 0.0119
2022-01-25 2021-12-31 13F BIOGEN COM 09062X103 2,185 -299 -12.04 524 -25.46 0.0161
2021-10-28 2021-09-30 13F BIOGEN COM 09062X103 2,484 79 3.28 703 -15.61 0.0243
2021-07-26 2021-06-30 13F BIOGEN COM 09062X103 2,405 256 11.91 833 38.60 0.0332
2021-04-30 2021-03-31 13F BIOGEN COM 09062X103 2,149 37 1.75 601 16.25 0.0266
2021-02-11 2020-12-31 13F BIOGEN COM 09062X103 2,112 -1,465 -40.96 517 -49.06 0.0244
2020-11-03 2020-09-30 13F BIOGEN COM 09062X103 3,577 928 35.03 1,015 43.16 0.0544
2020-07-30 2020-06-30 13F BIOGEN COM 09062X103 2,649 -100 -3.64 709 -18.51 0.0428
2020-04-23 2020-03-31 13F BIOGEN COM 09062X103 2,749 459 20.04 870 27.94 0.0752
2020-02-05 2019-12-31 13F BIOGEN COM 09062X103 2,290 -179 -7.25 680 18.26 0.0502
2019-10-16 2019-09-30 13F BIOGEN COM 09062X103 2,469 712 40.52 575 39.90 0.0472
2019-07-31 2019-06-30 13F BIOGEN COM 09062X103 1,757 -355 -16.81 411 -17.64 0.0356
2019-05-09 2019-03-31 13F BIOGEN COM 09062X103 2,112 -122 -5.46 499 -25.74 0.0425
2019-02-13 2018-12-31 13F BIOGEN COM 09062X103 2,234 180 8.76 672 -7.44 0.0626
2018-11-14 2018-09-30 13F BIOGEN COM 09062X103 2,054 81 4.11 726 26.70 0.0738
2018-08-14 2018-06-30 13F BIOGEN COM 09062X103 1,973 476 31.80 573 39.76 0.0639
2018-05-08 2018-03-31 13F BIOGEN COM 09062X103 1,497 86 6.09 410 -8.89 0.0481
2018-02-13 2017-12-31 13F BIOGEN COM 09062X103 1,411 102 7.79 450 9.76 0.0542
2017-11-14 2017-09-30 13F BIOGEN COM 09062X103 1,309 199 17.93 410 36.21 0.0544
2017-08-14 2017-06-30 13F BIOGEN COM 09062X103 1,110 13 1.19 301 0.33 0.0437
2017-05-15 2017-03-31 13F BIOGEN COM 09062X103 1,097 124 12.74 300 8.70 0.0444
2017-02-14 2016-12-31 13F BIOGEN COM 09062X103 973 8 0.83 276 -8.61 0.0464
2016-11-14 2016-09-30 13F BIOGEN COM 09062X103 965 247 34.40 302 73.56 0.0441
2016-07-29 2016-06-30 13F BIOGEN COM 09062X103 718 492 217.70 174 194.92 0.0254
2016-05-12 2016-03-31 13F BIOGEN COM 09062X103 226 15 7.11 59 -9.23 0.0101
2016-01-22 2015-12-31 13F BIOGEN COM 09062X103 211 90 74.38 65 85.71 0.0126
2015-10-23 2015-09-30 13F BIOGEN COM 09062X103 121 70 137.25 35 66.67 0.0080
2015-07-15 2015-06-30 13F BIOGEN COM 09062X103 51 28 121.74 21 110.00 0.0046
2015-04-15 2015-03-31 13F BIOGEN COM 09062X103 23 2 9.52 10 42.86 0.0024
2015-02-13 2014-12-31 13F BIOGEN IDEC COM 09062X103 21 21 0.00 7 0.0017
2014-08-14 2014-06-30 13F BIOGEN IDEC COM 09062X103 0 -14 -100.00 0 -100.00
2014-05-16 2014-03-31 13F BIOGEN IDEC COM 09062X103 14 -102 -87.93 4 -87.50 0.0016
2014-02-11 2013-12-31 13F BIOGEN IDEC COM 09062X103 116 0 0.00 32 14.29 0.0117
2013-11-13 2013-09-30 13F BIOGEN IDEC COM 09062X103 116 0 0.00 28 12.00 0.0120
2013-08-14 2013-06-30 13F BIOGEN IDEC COM 09062X103 116 116 25 0.0129
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.