百健公司
MX ˙ BMV ˙ US09062X1037
SecurityMX:BIIB / Biogen Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership1,446,579 shares
Latest Disclosed Value $ 265,201,330
Northern Trust Corp reports 0.03% increase in ownership of BIIB / Biogen Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 1,446,579 shares of Biogen Inc. (MX:BIIB) valued at $265,201,330 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,446,126 shares of Biogen Inc.. This represents a change in shares of 0.03% 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)
2026-05-14 2026-03-31 13F BIOGEN COM 09062X103 1,446,579 453 0.03 265,201 4.20 0.0072
2026-02-17 2025-12-31 13F BIOGEN COM 09062X103 1,446,126 -53,206 -3.55 254,504 21.18 0.0324
2025-11-14 2025-09-30 13F BIOGEN COM 09062X103 1,499,332 -37,648 -2.45 210,026 8.81 0.0269
2025-08-13 2025-06-30 13F BIOGEN COM 09062X103 1,536,980 35,893 2.39 193,029 -6.03 0.0265
2025-05-13 2025-03-31 13F BIOGEN COM 09062X103 1,501,087 -49,043 -3.16 205,409 -13.35 0.0305
2025-02-14 2024-12-31 13F BIOGEN COM 09062X103 1,550,130 196,995 14.56 237,046 -9.63 0.0336
2024-11-13 2024-09-30 13F BIOGEN COM 09062X103 1,353,135 -72,786 -5.10 262,292 -20.65 0.0429
2024-08-14 2024-06-30 13F BIOGEN COM 09062X103 1,425,921 37,535 2.70 330,557 10.41 0.0557
2024-05-14 2024-03-31 13F BIOGEN COM 09062X103 1,388,386 -106,577 -7.13 299,378 -22.61 0.0517
2024-02-13 2023-12-31 13F BIOGEN COM 09062X103 1,494,963 -148,072 -9.01 386,852 -8.39 0.0700
2023-11-13 2023-09-30 13F BIOGEN COM 09062X103 1,643,035 45,437 2.84 422,276 -7.21 0.0818
2023-08-11 2023-06-30 13F BIOGEN COM 09062X103 1,597,598 -73,691 -4.41 455,076 -2.06 0.0874
2023-05-15 2023-03-31 13F BIOGEN COM 09062X103 1,671,289 -380 -0.02 464,668 0.38 0.0921
2023-02-13 2022-12-31 13F BIOGEN COM 09062X103 1,671,669 -13,352 -0.79 462,919 2.89 0.0971
2022-11-14 2022-09-30 13F BIOGEN COM 09062X103 1,685,021 -24,556 -1.44 449,901 29.04 0.1028
2022-08-12 2022-06-30 13F BIOGEN COM 09062X103 1,709,577 24,050 1.43 348,651 -1.78 0.0747
2022-05-13 2022-03-31 13F BIOGEN COM 09062X103 1,685,527 -6,595 -0.39 354,972 -12.56 0.0624
2022-02-08 2021-12-31 13F BIOGEN COM 09062X103 1,692,122 -66,768 -3.80 405,973 -18.44 0.0665
2021-11-15 2021-09-30 13F BIOGEN COM 09062X103 1,758,890 -308,649 -14.93 497,749 -30.47 0.0881
2021-08-13 2021-06-30 13F BIOGEN COM 09062X103 2,067,539 -52,969 -2.50 715,926 20.69 0.1261
2021-05-12 2021-03-31 13F BIOGEN COM 09062X103 2,120,508 -80,450 -3.66 593,212 10.07 0.1103
2021-02-11 2020-12-31 13F BIOGEN COM 09062X103 2,200,958 -182,232 -7.65 538,926 -20.28 0.1050
2020-11-16 2020-09-30 13F BIOGEN COM 09062X103 2,383,190 -54,446 -2.23 676,063 3.66 0.1482
2020-08-14 2020-06-30 13F BIOGEN COM 09062X103 2,437,636 -33,166 -1.34 652,190 -16.57 0.1545
2020-05-14 2020-03-31 13F BIOGEN COM 09062X103 2,470,802 -20,459 -0.82 781,712 5.75 0.2244
2020-02-14 2019-12-31 13F BIOGEN COM 09062X103 2,491,261 -301,394 -10.79 739,231 13.70 0.1655
2019-11-13 2019-09-30 13F BIOGEN COM 09062X103 2,792,655 -90,235 -3.13 650,185 -3.57 0.1556
2019-08-13 2019-06-30 13F BIOGEN COM 09062X103 2,882,890 -16,277 -0.56 674,221 -1.62 0.1599
2019-05-13 2019-03-31 13F BIOGEN COM 09062X103 2,899,167 -8,139 -0.28 685,305 -21.67 0.1693
2019-02-12 2018-12-31 13F BIOGEN COM 09062X103 2,907,306 133,137 4.80 874,867 -10.74 0.2454
2018-11-14 2018-09-30 13F BIOGEN COM 09062X103 2,774,169 -118,390 -4.09 980,142 16.75 0.2399
2018-09-18 2018-06-30 13F/A-1 BIOGEN COM 09062X103 2,892,559 19,730 0.69 839,536 6.72 0.2132
2018-08-14 2018-06-30 13F BIOGEN COM 09062X103 2,906,614 33,785 843,616
2018-05-09 2018-03-31 13F BIOGEN COM 09062X103 2,872,829 -106,511 -3.57 786,637 -17.12 0.2046
2018-02-14 2017-12-31 13F BIOGEN COM 09062X103 2,979,340 -49,407 -1.63 949,128 0.08 0.2404
2017-11-13 2017-09-30 13F BIOGEN COM 09062X103 3,028,747 11,611 0.38 948,362 15.83 0.2472
2017-08-11 2017-06-30 13F BIOGEN COM 09062X103 3,017,136 223,371 8.00 818,731 7.18 0.2289
2017-05-12 2017-03-31 13F BIOGEN COM 09062X103 2,793,765 -70 -0.00 763,872 -3.58 0.2203
2017-02-13 2016-12-31 13F BIOGEN COM 09062X103 2,793,835 -184,644 -6.20 792,275 -15.02 0.2430
2016-11-09 2016-09-30 13F BIOGEN COM 09062X103 2,978,479 12,483 0.42 932,354 29.99 0.2904
2016-08-12 2016-06-30 13F BIOGEN COM 09062X103 2,965,996 -36,996 -1.23 717,237 -8.96 0.2328
2016-08-19 2016-03-31 13F/A-1 BIOGEN COM 09062X103 3,002,992 -22,269 -0.74 787,818 -14.99 0.2613
2016-05-13 2016-03-31 13F Biogen Idec COMM 09062X103 3,002,980 781,735
2016-02-12 2015-12-31 13F Biogen Idec COMM 09062X103 3,025,261 -143,733 -4.54 926,790 0.22 0.3072
2015-11-12 2015-09-30 13F BIOGEN COM 09062X103 3,168,994 316,370 11.09 924,744 -19.75 0.3086
2015-08-13 2015-06-30 13F BIOGEN COM 09062X103 2,852,624 -268,227 -8.59 1,152,289 -12.56 0.7811
2015-08-13 2015-06-30 13F Biogen Idec COMM 009062X10 246,816 -2,874,035 99,699 0.0676
2015-05-14 2015-03-31 13F Biogen Idec COMM 09062X103 3,120,851 -24,405 -0.78 1,317,748 23.42 0.3963
2015-02-12 2014-12-31 13F Biogen Idec COM 09062X103 3,145,256 -78,567 -2.44 1,067,657 0.11 0.3223
2014-11-13 2014-09-30 13F Biogen Idec COMM 09062X103 3,223,823 75,201 2.39 1,066,473 7.42 0.3349
2014-08-14 2014-06-30 13F BIOGEN IDEC com 09062X103 3,148,622 -157,094 -4.75 992,791 -1.81 0.3094
2014-05-14 2014-03-31 13F BIOGEN IDEC COM 09062X103 3,305,716 103,600 3.24 1,011,119 12.95 0.3181
2014-02-21 2013-12-31 13F/A-1 BIOGEN IDEC COM 09062X103 3,202,116 -13,226 -0.41 895,222 15.64 0.2871
2014-02-12 2013-12-31 13F BIOGEN IDEC COM 09062X103 3,202,116 895,222
2013-11-13 2013-09-30 13F BIOGEN IDEC COM 09062X103 3,215,342 -130,336 -3.90 774,126 7.52 0.2726
2013-08-09 2013-06-30 13F BIOGEN IDEC COM 09062X103 3,345,678 3,345,678 719,990 0.2609
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.