Biogen Inc.
MX ˙ BMV ˙ US09062X1037
SecurityMX:BIIB / Biogen Inc.
InstitutionJohnson Financial Group, Inc.
Latest Disclosed Ownership150 shares
Latest Disclosed Value $ 27,501
Johnson Financial Group, Inc. reports 30.43% increase in ownership of BIIB / Biogen Inc.

On May 7, 2026 - Johnson Financial Group, Inc. filed a 13F-HR form disclosing ownership of 150 shares of Biogen Inc. (MX:BIIB) valued at $27,501 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 115 shares of Biogen Inc.. This represents a change in shares of 30.43% during the quarter.

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)
2026-05-07 2026-03-31 13F BIOGEN COM 09062X103 150 35 30.43 28 35.00 0.0010
2026-02-12 2025-12-31 13F BIOGEN COM 09062X103 115 -4 -3.36 20 25.00 0.0008
2025-11-13 2025-09-30 13F BIOGEN COM 09062X103 119 80 205.13 17 300.00 0.0006
2025-08-13 2025-06-30 13F BIOGEN COM 09062X103 39 0 0.00 5 -20.00 0.0002
2025-05-15 2025-03-31 13F BIOGEN COM 09062X103 39 0 0.00 5 0.00 0.0003
2025-02-14 2024-12-31 13F BIOGEN COM 09062X103 39 -8 -17.02 6 -44.44 0.0003
2024-11-13 2024-09-30 13F BIOGEN COM 09062X103 47 8 20.51 9 0.00 0.0004
2024-08-14 2024-06-30 13F BIOGEN COM 09062X103 39 0 0.00 9 12.50 0.0004
2024-05-14 2024-03-31 13F BIOGEN COM 09062X103 39 -46 -54.12 8 -61.90 0.0005
2024-02-09 2023-12-31 13F/A-1 BIOGEN COM 09062X103 85 28 49.12 22 50.00 0.0012
2024-02-09 2023-12-31 13F BIOGEN COM 09062X103 85 28 22 0.0007
2023-11-14 2023-09-30 13F BIOGEN COM 09062X103 57 57 15 0.0010
2022-02-14 2021-12-31 13F BIOGEN COM 09062X103 0 -86 -100.00 0 -100.00
2021-11-12 2021-09-30 13F BIOGEN COM 09062X103 86 -825 -90.56 24 -92.38 0.0016
2021-08-13 2021-06-30 13F BIOGEN COM 09062X103 911 172 23.27 315 52.17 0.0206
2021-05-14 2021-03-31 13F BIOGEN COM 09062X103 739 224 43.50 207 64.29 0.0139
2021-02-12 2020-12-31 13F BIOGEN COM 09062X103 515 -318 -38.18 126 -46.61 0.0108
2020-11-12 2020-09-30 13F BIOGEN COM 09062X103 833 64 8.32 236 14.56 0.0241
2020-08-11 2020-06-30 13F BIOGEN COM 09062X103 769 40 5.49 206 -10.82 0.0221
2020-05-14 2020-03-31 13F BIOGEN COM 09062X103 729 24 3.40 231 10.53 0.0276
2020-02-14 2019-12-31 13F BIOGEN COM 09062X103 705 -203 -22.36 209 -0.95 0.0189
2019-11-12 2019-09-30 13F BIOGEN COM 09062X103 908 105 13.08 211 12.23 0.0194
2019-08-09 2019-06-30 13F BIOGEN COM 09062X103 803 51 6.78 188 5.62 0.0167
2019-05-13 2019-03-31 13F BIOGEN COM 09062X103 752 64 9.30 178 -14.01 0.0158
2019-02-11 2018-12-31 13F BIOGEN COM 09062X103 688 410 147.48 207 111.22 0.0213
2018-11-09 2018-09-30 13F BIOGEN COM 09062X103 278 17 6.51 98 28.95 0.0100
2018-08-07 2018-06-30 13F BIOGEN COM 09062X103 261 -45 -14.71 76 -9.52 0.0083
2018-05-07 2018-03-31 13F BIOGEN COM 09062X103 306 -1,534 -83.37 84 -85.67 0.0100
2018-02-12 2017-12-31 13F BIOGEN COM 09062X103 1,840 -115 -5.88 586 -4.25 0.0718
2017-11-09 2017-09-30 13F BIOGEN COM 09062X103 1,955 -2,209 -53.05 612 -45.84 0.0805
2017-08-10 2017-06-30 13F BIOGEN COM 09062X103 4,164 -548 -11.63 1,130 -12.34 0.1625
2017-05-12 2017-03-31 13F BIOGEN COM 09062X103 4,712 240 5.37 1,289 1.58 0.1623
2017-02-07 2016-12-31 13F/A-1 BIOGEN COM 09062X103 4,472 728 19.44 1,269 8.28 0.1750
2017-02-02 2016-12-31 13F BIOGEN COM 09062X103 4,472 1,269
2016-11-14 2016-09-30 13F BIOGEN COM 09062X103 3,744 992 36.05 1,172 76.24 0.1565
2016-08-12 2016-06-30 13F BIOGEN COM 09062X103 2,752 1,256 83.96 665 70.95 0.0921
2016-05-09 2016-03-31 13F BIOGEN COM 09062X103 1,496 848 130.86 389 95.48 0.0778
2016-02-08 2015-12-31 13F BIOGEN COM 09062X103 648 464 252.17 199 275.47 0.0414
2015-11-02 2015-09-30 13F BIOGEN COM 09062X103 184 57 44.88 53 3.92 0.0116
2015-08-11 2015-06-30 13F BIOGEN COM 09062X103 127 34 36.56 51 30.77 0.0106
2015-05-12 2015-03-31 13F BIOGEN COM 09062X103 93 7 8.14 39 34.48 0.0084
2015-02-10 2014-12-31 13F BIOGEN IDEC COM 09062X103 86 -12 -12.24 29 -9.37 0.0067
2014-11-14 2014-09-30 13F BIOGEN IDEC COM 09062X103 98 49 100.00 32 113.33 0.0083
2014-08-06 2014-06-30 13F BIOGEN IDEC COM 09062X103 49 0 0.00 15 0.00 0.0040
2014-05-14 2014-03-31 13F BIOGEN IDEC COM 09062X103 49 -6 -10.91 15 0.00 0.0044
2014-02-11 2013-12-31 13F BIOGEN IDEC COM 09062X103 55 0 0.00 15 15.38 0.0043
2013-11-14 2013-09-30 13F BIOGEN IDEC COM 09062X103 55 55 13 0.0039
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.