Biogen Inc.
US ˙ NasdaqGS ˙ US09062X1037

SecurityBIIB / Biogen Inc.
InstitutionVan Eck Associates Corp
Latest Disclosed Ownership1,079,861 shares
Latest Disclosed Value $ 197,970
Van Eck Associates Corp reports 1.34% increase in ownership of BIIB / Biogen Inc.

On May 15, 2026 - Van Eck Associates Corp filed a 13F-HR form disclosing ownership of 1,079,861 shares of Biogen Inc. (US:BIIB) valued at $197,970,917 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,065,616 shares of Biogen Inc.. This represents a change in shares of 1.34% during the quarter. The current value of the position is $211,609,562 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)
2026-05-15 2026-03-31 13F Biogen COM 09062X103 1,079,861 14,245 1.34 198 5.35 0.1297
2026-02-13 2025-12-31 13F Biogen COM 09062X103 1,065,616 -1,315 -0.12 188 25.50 0.1550
2025-11-13 2025-09-30 13F Biogen COM 09062X103 1,066,931 -7,880 -0.73 149 11.19 0.1389
2025-08-14 2025-06-30 13F Biogen COM 09062X103 1,074,811 1,189 0.11 135 -8.22 0.1528
2025-05-15 2025-03-31 13F Biogen COM 09062X103 1,073,622 7,162 0.67 147 -10.43 0.1899
2025-01-29 2024-12-31 13F Biogen COM 09062X103 1,066,460 967,523 977.92 163 805.56 0.2088
2024-10-29 2024-09-30 13F Biogen COM 09062X103 98,937 -823,824 -89.28 18 -91.55 0.0226
2024-07-31 2024-06-30 13F Biogen COM 09062X103 922,761 -814,579 -46.89 214 -43.05 0.3040
2024-04-30 2024-03-31 13F Biogen COM 09062X103 1,737,340 316,144 22.24 375 1.91 0.5663
2024-02-05 2023-12-31 13F Biogen COM 09062X103 1,421,196 231,650 19.47 368 20.33 0.6692
2023-11-08 2023-09-30 13F Biogen COM 09062X103 1,189,546 233,889 24.47 306 12.13 0.6709
2023-08-03 2023-06-30 13F Biogen COM 09062X103 955,657 145,279 17.93 272 20.89 0.5957
2023-05-03 2023-03-31 13F Biogen COM 09062X103 810,378 22,820 2.90 225 3.21 0.5129
2023-02-08 2022-12-31 13F Biogen COM 09062X103 787,558 -130,428 -14.21 218 -99.91 0.5634
2022-10-27 2022-09-30 13F Biogen COM 09062X103 917,986 -31,849 -3.35 245,103 26.53 0.7294
2022-08-03 2022-06-30 13F Biogen COM 09062X103 949,835 11,957 1.27 193,710 -1.93 0.5136
2022-05-10 2022-03-31 13F Biogen COM 09062X103 937,878 138,949 17.39 197,517 3.05 0.4076
2022-01-26 2021-12-31 13F Biogen COM 09062X103 798,929 158,854 24.82 191,679 5.82 0.4435
2021-11-03 2021-09-30 13F Biogen COM 09062X103 640,075 43,528 7.30 181,135 -12.31 0.4554
2021-08-10 2021-06-30 13F Biogen COM 09062X103 596,547 -27,497 -4.41 206,566 18.32 0.4887
2021-05-13 2021-03-31 13F Biogen COM 09062X103 624,044 107,220 20.75 174,576 37.95 0.4749
2021-02-09 2020-12-31 13F Biogen COM 09062X103 516,824 81,406 18.70 126,549 2.45 0.3686
2020-12-04 2020-09-30 13F/A-1 Biogen COM 09062X103 435,418 49,103 12.71 123,519 19.51 0.3931
2020-11-12 2020-09-30 13F Biogen COM 09062X103 435,418 49,103 123,519 382,952.6171
2020-08-14 2020-06-30 13F/A-1 Biogen COM 09062X103 386,315 37,434 10.73 103,358 -6.36 0.3600
2020-08-10 2020-06-30 13F Biogen COM 09062X103 386,315 37,434 103,358 351,133.1073
2020-05-12 2020-03-31 13F Biogen COM 09062X103 348,881 -60,015 -14.68 110,379 -9.03 0.5605
2020-02-13 2019-12-31 13F Biogen COM 09062X103 408,896 46,897 12.96 121,331 43.96 0.4687
2019-11-08 2019-09-30 13F Biogen COM 09062X103 361,999 51,931 16.75 84,281 16.22 0.3950
2019-08-07 2019-06-30 13F Biogen COM 09062X103 310,068 60,339 24.16 72,516 22.84 0.3493
2019-05-13 2019-03-31 13F Biogen COM 09062X103 249,729 34,036 15.78 59,031 -9.05 0.2900
2019-02-12 2018-12-31 13F Biogen COM 09062X103 215,693 9,644 4.68 64,906 -10.84 0.3255
2018-11-13 2018-09-30 13F Biogen COM 09062X103 206,049 -7,859 -3.67 72,799 17.26 0.3551
2018-08-13 2018-06-30 13F Biogen COM 09062X103 213,908 9,806 4.80 62,085 11.09 0.2903
2018-05-11 2018-03-31 13F Biogen COM 09062X103 204,102 -23,802 -10.44 55,887 -23.02 0.2778
2018-02-12 2017-12-31 13F Biogen COM 09062X103 227,904 -7,578 -3.22 72,603 -1.53 0.3581
2017-11-09 2017-09-30 13F Biogen COM 09062X103 235,482 -21,295 -8.29 73,734 5.82 0.3767
2017-08-11 2017-06-30 13F Biogen COM 09062X103 256,777 7,906 3.18 69,679 2.40 0.3809
2017-05-11 2017-03-31 13F Biogen COM 09062X103 248,871 36,159 17.00 68,046 12.81 0.3000
2017-02-09 2016-12-31 13F Biogen COM 09062X103 212,712 13,339 6.69 60,321 -3.35 0.3006
2016-11-14 2016-09-30 13F Biogen COM 09062X103 199,373 -7,341 -3.55 62,410 24.85 0.2904
2016-08-12 2016-06-30 13F Biogen COM 09062X103 206,714 -39,262 -15.96 49,988 -21.93 0.2561
2016-05-13 2016-03-31 13F Biogen COM 09062X103 245,976 -13,844 -5.33 64,032 -19.55 0.4313
2016-02-12 2015-12-31 13F Biogen Idec COM 09062X103 259,820 93,333 56.06 79,596 63.84 0.6314
2015-11-12 2015-09-30 13F Biogen Idec COM 09062X103 166,487 9,355 5.95 48,583 -23.46 0.3733
2015-08-12 2015-06-30 13F Biogen Idec COM 09062X103 157,132 -2,253 -1.41 63,472 -5.69 0.3754
2015-05-14 2015-03-31 13F Biogen Idec COM 09062X103 159,385 24,606 18.26 67,299 47.10 0.3886
2015-02-13 2014-12-31 13F Biogen Idec COM 09062X103 134,779 -3,925 -2.83 45,751 -0.29 0.2844
2014-11-14 2014-09-30 13F Biogen Idec COM 09062X103 138,704 -13,788 -9.04 45,885 -4.57 0.2431
2014-08-14 2014-06-30 13F Biogen Idec COM 09062X103 152,492 -15,548 -9.25 48,082 -6.45 0.2219
2014-05-08 2014-03-31 13F BIOGEN IDEC COM 09062X103 168,040 22,568 15.51 51,398 26.38 0.2551
2014-02-12 2013-12-31 13F BIOGEN IDEC COM 09062X103 145,472 8,458 6.17 40,670 23.29 0.2054
2013-11-14 2013-09-30 13F BIOGEN IDEC COM 09062X103 137,014 40,299 41.67 32,987 58.49 0.1679
2013-08-14 2013-06-30 13F BIOGEN IDEC COM 09062X103 96,715 96,715 20,813 0.1134
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.