Biogen Inc.
US ˙ NasdaqGS ˙ US09062X1037

SecurityBIIB / Biogen Inc.
InstitutionWetherby Asset Management Inc
Latest Disclosed Ownership3,832 shares
Latest Disclosed Value $ 536,787
Wetherby Asset Management Inc reports 8.41% decrease in ownership of BIIB / Biogen Inc.

On November 14, 2025 - Wetherby Asset Management Inc filed a 13F-HR form disclosing ownership of 3,832 shares of Biogen Inc. (US:BIIB) valued at $536,787 USD as of September 30, 2025. The entity filed a previous 13F-HR on August 14, 2025 disclosing 4,184 shares of Biogen Inc.. This represents a change in shares of -8.41% during the quarter. The current value of the position is $748,543 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)
2025-11-14 2025-09-30 13F BIOGEN COM 09062X103 3,832 -352 -8.41 537 2.10 0.0160
2025-08-14 2025-06-30 13F BIOGEN COM 09062X103 4,184 1,422 51.48 525 24.41 0.0234
2025-02-14 2024-12-31 13F BIOGEN COM 09062X103 2,762 -283 -9.29 422 -28.47 0.0202
2024-11-14 2024-09-30 13F BIOGEN COM 09062X103 3,045 -1,514 -33.21 590 -44.13 0.0270
2024-08-14 2024-06-30 13F BIOGEN COM 09062X103 4,559 2,095 85.02 1,057 98.87 0.0498
2024-05-15 2024-03-31 13F BIOGEN COM 09062X103 2,464 -44 -1.75 531 -18.06 0.0253
2024-02-14 2023-12-31 13F BIOGEN COM 09062X103 2,508 -177 -6.59 649 -6.09 0.0338
2023-11-14 2023-09-30 13F BIOGEN COM 09062X103 2,685 51 1.94 690 -8.00 0.0391
2023-08-14 2023-06-30 13F BIOGEN COM 09062X103 2,634 158 6.38 750 9.01 0.0404
2023-05-12 2023-03-31 13F BIOGEN COM 09062X103 2,476 -277 -10.06 688 -9.71 0.0403
2023-02-14 2022-12-31 13F BIOGEN COM 09062X103 2,753 667 31.98 762 36.80 0.0490
2022-11-14 2022-09-30 13F BIOGEN COM 09062X103 2,086 -202 -8.83 557 19.27 0.0393
2022-08-15 2022-06-30 13F BIOGEN COM 09062X103 2,288 -563 -19.75 467 -22.17 0.0319
2022-05-16 2022-03-31 13F BIOGEN COM 09062X103 2,851 -97 -3.29 600 -15.13 0.0344
2022-02-14 2021-12-31 13F BIOGEN COM 09062X103 2,948 -1,581 -34.91 707 -44.85 0.0397
2021-11-15 2021-09-30 13F BIOGEN COM 09062X103 4,529 63 1.41 1,282 -17.08 0.0791
2021-08-16 2021-06-30 13F BIOGEN COM 09062X103 4,466 -116 -2.53 1,546 20.69 0.0943
2021-05-14 2021-03-31 13F BIOGEN COM 09062X103 4,582 223 5.12 1,281 20.06 0.0976
2021-02-11 2020-12-31 13F BIOGEN COM 09062X103 4,359 4,165 2,146.91 1,067 1,840.00 0.0724
2020-12-16 2020-09-30 13F/A-01 BIOGEN COM 09062X103 3,809 -639 1,081 0.0991
2020-12-16 2020-09-30 13F/A-02 BIOGEN COM 09062X103 194 -4,254 -95.64 55 -95.38 0.1653
2020-11-13 2020-09-30 13F BIOGEN COM 09062X103 4,037 -411 1,145 72,832.0537
2020-08-14 2020-06-30 13F BIOGEN COM 09062X103 4,448 315 7.62 1,190 -8.95 0.1128
2020-05-06 2020-03-31 13F BIOGEN COM 09062X103 4,133 436 11.79 1,307 19.14 0.1467
2020-01-28 2019-12-31 13F BIOGEN COM 09062X103 3,697 -87 -2.30 1,097 24.52 0.1080
2019-10-31 2019-09-30 13F BIOGEN COM 09062X103 3,784 438 13.09 881 12.66 0.0920
2019-07-25 2019-06-30 13F BIOGEN COM 09062X103 3,346 -944 -22.00 782 -22.88 0.0856
2019-07-25 2019-03-31 13F/A-1 BIOGEN COM 09062X103 4,290 176 4.28 1,014 -18.09 0.1263
2019-05-09 2019-03-31 13F BIOGEN COM 09062X103 4,290 176 1,014
2019-01-30 2018-12-31 13F BIOGEN COM 09062X103 4,114 -21 -0.51 1,238 -15.26 0.1751
2018-11-07 2018-09-30 13F BIOGEN COM 09062X103 4,135 352 9.30 1,461 33.06 0.1805
2018-07-24 2018-06-30 13F BIOGEN COM 09062X103 3,783 355 10.36 1,098 16.93 0.1486
2018-05-04 2018-03-31 13F BIOGEN COM 09062X103 3,428 -132 -3.71 939 -17.27 0.1296
2018-02-09 2017-12-31 13F BIOGEN COM 09062X103 3,560 254 7.68 1,135 9.66 0.1575
2017-11-13 2017-09-30 13F BIOGEN COM 09062X103 3,306 271 8.93 1,035 25.61 0.1540
2017-08-01 2017-06-30 13F BIOGEN COM 09062X103 3,035 -548 -15.29 824 -15.92 0.1402
2017-04-27 2017-03-31 13F BIOGEN COM 09062X103 3,583 283 8.58 980 4.81 0.1762
2017-02-08 2016-12-31 13F BIOGEN COM 09062X103 3,300 -95 -2.80 935 -12.04 0.1831
2016-11-14 2016-09-30 13F BIOGEN COM 09062X103 3,395 484 16.63 1,063 50.99 0.2150
2016-08-10 2016-06-30 13F BIOGEN COM 09062X103 2,911 23 0.80 704 -6.38 0.1561
2016-05-10 2016-03-31 13F BIOGEN COM 09062X103 2,888 -187 -6.08 752 -20.17 0.1772
2016-02-08 2015-12-31 13F BIOGEN COM 09062X103 3,075 241 8.50 942 13.91 0.2258
2015-11-12 2015-09-30 13F BIOGEN COM 09062X103 2,834 -618 -17.90 827 -40.67 0.2119
2015-08-12 2015-06-30 13F BIOGEN COM 09062X103 3,452 123 3.69 1,394 -0.78 0.3351
2015-05-08 2015-03-31 13F BIOGEN COM 09062X103 3,329 508 18.01 1,405 46.66 0.3420
2015-02-12 2014-12-31 13F BIOGEN IDEC COM 09062X103 2,821 35 1.26 958 4.02 0.2409
2014-11-03 2014-09-30 13F BIOGEN IDEC COM 09062X103 2,786 -11 -0.39 921 4.42 0.2568
2014-08-01 2014-06-30 13F BIOGEN IDEC COM 09062X103 2,797 13 0.47 882 3.52 0.2490
2014-05-05 2014-03-31 13F/A-1 BIOGEN IDEC COM 09062X103 2,784 -60 -2.11 852 7.17 0.2442
2014-04-30 2014-03-31 13F BIOGEN IDEC COM 09062X103 2,784 852
2014-01-29 2013-12-31 13F BIOGEN IDEC COM 09062X103 2,844 -7 -0.25 795 15.89 0.2267
2013-10-29 2013-09-30 13F BIOGEN IDEC COM 09062X103 2,851 412 16.89 686 30.92 0.2140
2013-07-24 2013-06-30 13F BIOGEN IDEC COM 09062X103 2,439 2,439 524 0.1826
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.