Biogen Inc.
US ˙ NasdaqGS ˙ US09062X1037

SecurityBIIB / Biogen Inc.
InstitutionFirst Horizon Advisors, Inc.
Latest Disclosed Ownership110 shares
Latest Disclosed Value $ 13,855
First Horizon Advisors, Inc. reports 5.77% increase in ownership of BIIB / Biogen Inc.

On August 6, 2025 - First Horizon Advisors, Inc. filed a 13F-HR form disclosing ownership of 110 shares of Biogen Inc. (US:BIIB) valued at $13,815 USD as of June 30, 2025. The entity filed a previous 13F-HR on April 28, 2025 disclosing 104 shares of Biogen Inc.. This represents a change in shares of 5.77% during the quarter. The current value of the position is $21,487 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.

Upgrade to unlock premium data and export to Excel .

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)
2025-08-06 2025-06-30 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 110 6 5.77 14 -7.14 0.0004
2025-04-28 2025-03-31 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 104 4 4.00 14 -6.67 0.0004
2025-02-03 2024-12-31 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 100 -82 -45.05 15 -57.14 0.0004
2024-11-08 2024-09-30 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 182 10 5.81 35 -10.26 0.0010
2024-07-19 2024-06-30 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 172 49 39.84 40 50.00 0.0012
2024-04-26 2024-03-31 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 123 -88 -41.71 27 -51.85 0.0008
2024-02-06 2023-12-31 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 211 -67 -24.10 55 -23.94 0.0018
2023-10-27 2023-09-30 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 278 -460 -62.33 71 -66.19 0.0026
2023-08-03 2023-06-30 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 738 -83 -10.11 210 -7.89 0.0073
2023-05-15 2023-03-31 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 821 -134 -14.03 228 -13.64 0.0081
2023-02-10 2022-12-31 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 955 -531 -35.73 264 -33.33 0.0097
2022-11-09 2022-09-30 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 1,486 20 1.36 396 32.89 0.0159
2022-08-02 2022-06-30 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 1,466 -3,929 -72.83 298 -73.77 0.0106
2022-05-10 2022-03-31 13F BIOGEN COMMON STOCK 09062X103 5,395 -12,007 -69.00 1,136 -72.79 0.0480
2022-05-10 2022-03-31 13F BIOGEN COMMON STOCK 09062X103 4,160 876
2022-02-09 2021-12-31 13F BIOGEN COMMON STOCK 09062X103 17,402 -950 -5.18 4,175 -19.59 0.1261
2021-11-15 2021-09-30 13F/A-1 BIOGEN COMMON STOCK 09062X103 18,352 866 4.95 5,192 -14.22 0.1696
2021-11-09 2021-09-30 13F BIOGEN COMMON STOCK 09062X103 32,858 15,372 5,027 0.0734
2021-08-09 2021-06-30 13F BIOGEN COMMON STOCK 09062X103 17,486 -187 -1.06 6,053 22.46 0.3263
2021-05-11 2021-03-31 13F BIOGEN COMMON STOCK 09062X103 17,673 466 2.71 4,943 17.36 0.2856
2021-02-11 2020-12-31 13F BIOGEN COMMON STOCK 09062X103 17,207 -328 -1.87 4,212 -15.30 0.2827
2020-11-12 2020-09-30 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 17,535 -52 -0.30 4,973 5.70 0.3726
2020-07-31 2020-06-30 13F BIOGEN COMMON STOCK 09062X103 17,587 146 0.84 4,705 -14.72 0.3706
2020-05-05 2020-03-31 13F BIOGEN COMMON STOCK 09062X103 17,441 -458 -2.56 5,517 3.90 0.5156
2020-01-07 2019-12-31 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 17,899 -513 -2.79 5,310 23.89 0.3910
2019-10-23 2019-09-30 13F BIOGEN INC COM USD0.0005 COMMON STOCK 09062X103 18,412 3,097 20.22 4,286 19.69 0.3340
2019-08-05 2019-06-30 13F BIOGEN COMMON STOCK 09062X103 15,315 449 3.02 3,581 1.94 0.2765
2019-04-26 2019-03-31 13F BIOGEN COMMON STOCK 09062X103 14,866 956 6.87 3,513 -16.06 0.2812
2019-02-11 2018-12-31 13F BIOGEN COMMON STOCK 09062X103 13,910 -1,605 -10.34 4,185 -23.63 0.3730
2018-11-08 2018-09-30 13F/A-2 BIOGEN INC COM COMMON STOCK 09062X103 15,515 -401 -2.52 5,480 18.64 0.4263
2018-11-05 2018-09-30 13F/A-1 BIOGEN INC COM COMMON STOCK 09062X103 15,515 0 6,495 0.3631
2018-11-05 2018-09-30 13F BIOGEN INC COM COMMON STOCK 09062X103 2,833 -13,083 2,015 0.1856
2018-08-06 2018-06-30 13F BIOGEN INC COM COMMON STOCK 09062X103 15,916 64 0.40 4,619 7.05 0.3874
2018-05-02 2018-03-31 13F BIOGEN INC COM COMMON STOCK 09062X103 15,852 -710 -4.29 4,315 -19.03 0.4199
2018-01-25 2017-12-31 13F BIOGEN0INC0COM COMMON0STOCK 09062X103 16,562 -259 -1.54 5,329 1.00 0.5065
2017-11-09 2017-09-30 13F BIOGEN INC COM COMMON STOCK 09062X103 16,821 -106 -0.63 5,276 13.61 0.5437
2017-08-14 2017-06-30 13F BIOGEN INC COM COMMON STOCK 09062X103 16,927 885 5.52 4,644 6.08 0.5054
2017-05-02 2017-03-31 13F BIOGEN INC COM COMMON STOCK 09062X103 16,042 893 5.89 4,378 -6.55 0.4986
2017-02-13 2016-12-31 13F BIOGEN INC COM COMMON STOCK 09062X103 15,149 0 0.00 4,685 0.00 0.5957
2016-10-28 2016-09-30 13F BIOGEN INC COM COMMON STOCK 09062X103 15,149 500 3.41 4,685 32.31 0.5957
2016-07-29 2016-06-30 13F BIOGEN INC COM COMMON STOCK 09062X103 14,649 -797 -5.16 3,541 -12.22 0.4802
2016-05-09 2016-03-31 13F BIOGEN INC COM ISIN #US09062X1037 SEDOL #2455965 COMMON STOCK 09062X103 15,446 2,572 19.98 4,034 2.31 0.4495
2016-02-08 2015-12-31 13F BIOGEN INC COM ISIN #US09062X1037 SEDOL #2455965 COMMON STOCK 09062X103 12,874 -482 -3.61 3,943 1.18 0.7003
2015-11-06 2015-09-30 13F BIOGEN INC COM ISIN #US09062X1037 SEDOL #2455965 COMMON STOCK 09062X103 13,356 300 2.30 3,897 -26.10 0.6010
2015-08-03 2015-06-30 13F/A-1 BIOGEN INC COM ISIN #US09062X1037 SEDOL #2455965 COMMON STOCK 09062X103 13,056 165 1.28 5,273 -3.48 0.7650
2015-07-31 2015-06-30 13F BIOGEN INC COM ISIN #US09062X1037 SEDOL #2455965 COMMON STOCK 09062X103 10,991 4,777
2015-05-04 2015-03-31 13F BIOGEN COMMON STOCK 09062X103 12,891 12,891 0.00 5,463 0.7906
2015-02-05 2014-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 0 -1,356 -100.00 0 -100.00
2014-11-13 2014-09-30 13F/A-1 BIOGEN IDEC COMMON STOCK 09062X103 1,356 472 53.39 448 60.57 0.0700
2014-11-13 2014-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 1,356 472 448 0.0456
2014-08-07 2014-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 884 735 493.29 279 534.09 0.0404
2014-05-02 2014-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 149 -28 -15.82 44 -12.00 0.0062
2014-02-07 2013-12-31 13F BIOGEN IDEC COMMON STOCK 09062X103 177 98 124.05 50 163.16 0.0075
2013-11-15 2013-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 79 26 49.06 19 72.73 0.0031
2014-02-25 2013-06-30 13F BIOGEN IDEC Common Stock 09062X103 53 -3 -5.36 11 0.00 0.0056
2014-02-25 2013-03-31 13F BIOGEN IDEC Common Stock 09062X103 56 17 43.59 11 83.33 0.0062
2014-02-25 2012-12-31 13F BIOGEN IDEC Common Stock 09062X103 39 0 0.00 6 0.00 0.0043
2014-02-25 2012-09-30 13F BIOGEN IDEC COMMON STOCK 09062X103 39 -25 -39.06 6 -33.33 0.0048
2014-02-25 2012-06-30 13F BIOGEN IDEC COMMON STOCK 09062X103 64 22 52.38 9 80.00 0.0071
2014-02-25 2012-03-31 13F BIOGEN IDEC COMMON STOCK 09062X103 42 42 5 0.0041
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.