Biogen Inc.
MX ˙ BMV ˙ US09062X1037
SecurityMX:BIIB / Biogen Inc.
InstitutionSecurian Asset Management, Inc
Latest Disclosed Ownership3,945 shares
Latest Disclosed Value $ 723,237
Securian Asset Management, Inc ownership in BIIB / Biogen Inc.

On May 1, 2026 - Securian Asset Management, Inc filed a 13F-HR form disclosing ownership of 3,945 shares of Biogen Inc. (MX:BIIB) valued at $723,237 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 3,945 shares of Biogen Inc.. This represents a change in shares of 0.00% 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)
2026-05-01 2026-03-31 13F BIOGEN COM 09062X103 3,945 0 0.00 723 4.18 0.0286
2026-02-04 2025-12-31 13F BIOGEN COM 09062X103 3,945 -3,005 -43.24 694 -28.67 0.0263
2025-10-23 2025-09-30 13F BIOGEN COM 09062X103 6,950 -646 -8.50 974 2.10 0.0258
2025-07-30 2025-06-30 13F BIOGEN COM 09062X103 7,596 -100 -1.30 954 -9.50 0.0272
2025-05-01 2025-03-31 13F BIOGEN COM 09062X103 7,696 0 0.00 1,053 -10.46 0.0320
2025-02-10 2024-12-31 13F BIOGEN COM 09062X103 7,696 -300 -3.75 1,177 -24.08 0.0343
2024-11-13 2024-09-30 13F BIOGEN COM 09062X103 7,996 -300 -3.62 1,550 -19.45 0.0447
2024-07-15 2024-06-30 13F BIOGEN COM 09062X103 8,296 -200 -2.35 1,923 5.02 0.0561
2024-04-26 2024-03-31 13F BIOGEN COM 09062X103 8,496 -683 -7.44 1,832 -22.91 0.0537
2024-02-08 2023-12-31 13F BIOGEN COM 09062X103 9,179 -1,201 -11.57 2,375 -10.95 0.0673
2023-10-30 2023-09-30 13F BIOGEN COM 09062X103 10,380 -1,713 -14.17 2,668 -22.56 0.0797
2023-08-07 2023-06-30 13F BIOGEN COM 09062X103 12,093 0 0.00 3,445 2.44 0.0885
2023-04-27 2023-03-31 13F BIOGEN COM 09062X103 12,093 100 0.83 3,362 1.23 0.0896
2023-02-03 2022-12-31 13F BIOGEN COM 09062X103 11,993 182 1.54 3,321 110,600.00 0.0929
2022-10-28 2022-09-30 13F BIOGEN COM 09062X103 11,811 -100 -0.84 3 50.00 0.0940
2022-08-04 2022-06-30 13F BIOGEN COM 09062X103 11,911 0 0.00 2 0.00 0.0582
2022-05-03 2022-03-31 13F BIOGEN COM 09062X103 11,911 -200 -1.65 3 0.00 0.0490
2022-02-10 2021-12-31 13F BIOGEN COM 09062X103 12,111 -623 -4.89 3 -33.33 0.0536
2021-11-08 2021-09-30 13F BIOGEN COM 09062X103 12,734 -252 -1.94 4 -25.00 0.0741
2021-08-10 2021-06-30 13F BIOGEN COM 09062X103 12,986 -274 -2.07 4 33.33 0.0914
2021-05-10 2021-03-31 13F BIOGEN COM 09062X103 13,260 -504 -3.66 4 0.00 0.0806
2021-02-08 2020-12-31 13F BIOGEN COM 09062X103 13,764 -676 -4.68 3 -99.93 0.0762
2020-11-04 2020-09-30 13F Biogen COMMON STOCK 09062X103 14,440 -566 -3.77 4,096 2.02 0.0993
2020-08-06 2020-06-30 13F Biogen COMMON STOCK 09062X103 15,006 -2,736 -15.42 4,015 -28.47 0.1027
2020-05-07 2020-03-31 13F Biogen COMMON STOCK 09062X103 17,742 -266 -1.48 5,613 5.03 0.1584
2020-02-04 2019-12-31 13F Biogen COMMON STOCK 09062X103 18,008 -1,123 -5.87 5,344 19.98 0.1179
2019-11-12 2019-09-30 13F Biogen COMMON STOCK 09062X103 19,131 -1,232 -6.05 4,454 111,250.00 0.1021
2019-08-05 2019-06-30 13F Biogen COMMON STOCK 09062X103 20,363 -100 -0.49 5 0.00 0.1103
2019-04-26 2019-03-31 13F Biogen COMMON STOCK 09062X103 20,463 -248 -1.20 5 -33.33 0.1153
2019-02-04 2018-12-31 13F Biogen COMMON STOCK 09062X103 20,711 17 0.08 6 -14.29 0.1673
2018-10-26 2018-09-30 13F Biogen COMMON STOCK 09062X103 20,694 -1,006 -4.64 7 16.67 0.1736
2018-08-09 2018-06-30 13F Biogen COMMON STOCK 09062X103 21,700 100 0.46 6 20.00 0.1561
2018-04-30 2018-03-31 13F Biogen COMMON STOCK 09062X103 21,600 -100 -0.46 6 -16.67 0.1517
2018-02-05 2017-12-31 13F Biogen COMMON STOCK 09062X103 21,700 120 0.56 7 0.00 0.1708
2017-11-03 2017-09-30 13F Biogen COMMON STOCK 09062X103 21,580 18 0.08 7 20.00 0.1754
2017-08-14 2017-06-30 13F Biogen COMMON STOCK 09062X103 21,562 -300 -1.37 6 0.00 0.1540
2017-05-11 2017-03-31 13F Biogen COMMON STOCK 09062X103 21,862 -48 -0.22 6 -16.67 0.1600
2017-02-10 2016-12-31 13F Biogen COMMON STOCK 09062X103 21,910 -127 -0.58 6 0.00 0.1662
2016-11-14 2016-09-30 13F Biogen COMMON STOCK 09062X103 22,037 215 0.99 7 20.00 0.1866
2016-08-10 2016-06-30 13F Biogen COMMON STOCK 09062X103 21,822 343 1.60 5 0.00 0.1476
2016-11-08 2016-03-31 13F/A-1 Biogen COMMON STOCK 09062X103 21,479 -246 -1.13 6 -16.67 0.1610
2016-05-09 2016-03-31 13F Biogen COMMON STOCK 09062X103 21,479 5,591
2016-11-08 2015-12-31 13F/A-1 Biogen COMMON STOCK 09062X103 21,725 -481 -2.17 7 0.00 0.1976
2016-02-10 2015-12-31 13F Biogen COMMON STOCK 09062X103 21,725 6,655
2016-11-08 2015-09-30 13F/A-1 Biogen COMMON STOCK 09062X103 22,206 -125 -0.56 6 -33.33 0.2128
2015-11-12 2015-09-30 13F Biogen COMMON STOCK 09062X103 22,206 6,480
2016-11-08 2015-06-30 13F/A-2 Biogen Idec COMMON STOCK 09062X103 22,331 314 1.43 9 0.00 0.2817
2015-08-10 2015-06-30 13F Biogen Idec COMMON STOCK 09062X103 22,331 9,020
2016-11-08 2015-03-31 13F/A-2 Biogen Idec COMMON STOCK 09062X103 22,017 545 2.54 9 28.57 0.2711
2015-04-27 2015-03-31 13F Biogen Idec COMMON STOCK 09062X103 22,017 9,296
2016-11-08 2014-12-31 13F/A-2 Biogen Idec COMMON STOCK 09062X103 21,472 606 2.90 7 16.67 0.2255
2016-11-08 2014-09-30 13F/A-2 Biogen Idec COMMON STOCK 09062X103 20,866 -404 -1.90 7 0.00 0.2341
2014-10-28 2014-09-30 13F Biogen Idec COMMON STOCK 09062X103 20,866 6,903
2016-11-08 2014-06-30 13F/A-2 Biogen Idec COMMON STOCK 09062X103 21,270 124 0.59 7 0.00 0.2271
2014-08-01 2014-06-30 13F Biogen Idec COMMON STOCK 09062X103 21,270 6,707
2016-11-08 2014-03-31 13F/A-2 Biogen Idec COMMON STOCK 09062X103 21,146 153 0.73 6 20.00 0.2343
2014-05-07 2014-03-31 13F Biogen Idec COMMON STOCK 09062X103 21,146 6,467,927
2016-11-08 2013-12-31 13F/A-2 Biogen Idec COMMON STOCK 09062X103 20,993 -265 -1.25 6 0.00 0.2220
2014-01-23 2013-12-31 13F Biogen Idec COMMON STOCK 09062X103 20,993 5,872,792
2016-11-08 2013-09-30 13F/A-2 Biogen Idec COMMON STOCK 09062X103 21,258 400 1.92 5 25.00 0.2058
2013-11-08 2013-09-30 13F Biogen Idec COMMON STOCK 09062X103 21,258 5,118
2016-11-08 2013-06-30 13F/A-2 Biogen Idec COMMON STOCK 09062X103 20,858 837 4.18 4 33.33 0.1822
2013-08-13 2013-06-30 13F Biogen Idec COMMON STOCK 09062X103 20,858 4,489
2016-11-08 2013-03-31 13F/A-2 Biogen Idec COMMON STOCK 09062X103 20,021 13 0.06 4 50.00 0.1577
2016-11-08 2012-12-31 13F/A-2 Biogen Idec COMMON STOCK 09062X103 20,008 -479 -2.34 3 -33.33 0.1307
2016-11-08 2012-09-30 13F/A-2 Biogen Idec COMMON STOCK 09062X103 20,487 -300 -1.44 3 0.00 0.1365
2016-11-08 2012-06-30 13F/A-2 Biogen Idec COMMON STOCK 09062X103 20,787 -117 -0.56 3 50.00 0.1410
2016-11-08 2012-03-31 13F/A-2 BIOGEN IDEC COMMON STOCK 09062X103 20,904 -130 -0.62 3 0.00 0.1187
2016-11-08 2011-12-31 13F/A-2 Biogen Idec COMMON STOCK 09062X103 21,034 266 1.28 2 100.00 0.1181
2016-11-08 2011-09-30 13F/A-2 Biogen Idec COMMON STOCK 09062X103 20,768 20,768 2 0.1110
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.