Biogen Inc.
US ˙ NasdaqGS ˙ US09062X1037

SecurityBIIB / Biogen Inc.
InstitutionCitizens & Northern Corp
Latest Disclosed Ownership7,137 shares
Latest Disclosed Value $ 1,308,426
Citizens & Northern Corp reports 3.26% increase in ownership of BIIB / Biogen Inc.

On April 27, 2026 - Citizens & Northern Corp filed a 13F-HR form disclosing ownership of 7,137 shares of Biogen Inc. (US:BIIB) valued at $1,308,426 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 6,912 shares of Biogen Inc.. This represents a change in shares of 3.26% during the quarter. The current value of the position is $1,394,142 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)
2026-04-27 2026-03-31 13F Biogen Idec COM 09062X103 7,137 225 3.26 1,308 7.57 0.3263
2026-01-28 2025-12-31 13F Biogen Idec COM 09062X103 6,912 -84 -1.20 1,216 24.08 0.3014
2025-10-24 2025-09-30 13F Biogen Idec COM 09062X103 6,996 -32 -0.46 980 11.11 0.2429
2025-07-30 2025-06-30 13F Biogen Idec COM 09062X103 7,028 2,315 49.12 883 36.96 0.2362
2025-04-21 2025-03-31 13F Biogen Idec COM 09062X103 4,713 1,819 62.85 645 45.70 0.1818
2025-01-31 2024-12-31 13F Biogen Idec COM 09062X103 2,894 -1,328 -31.45 443 -45.97 0.1212
2024-11-04 2024-09-30 13F Biogen Idec COM 09062X103 4,222 -130 -2.99 818 -18.85 0.2457
2024-07-30 2024-06-30 13F Biogen Idec COM 09062X103 4,352 -149 -3.31 1,009 3.92 0.3155
2024-05-13 2024-03-31 13F Biogen Idec COM 09062X103 4,501 97 2.20 971 -14.84 0.3282
2024-02-09 2023-12-31 13F Biogen Idec COM 09062X103 4,404 -190 -4.14 1,140 -3.47 0.4068
2023-11-13 2023-09-30 13F Biogen Idec COM 09062X103 4,594 -131 -2.77 1,181 -12.27 0.4741
2023-08-11 2023-06-30 13F Biogen Idec COM 09062X103 4,725 -160 -3.28 1,346 -0.96 0.5086
2023-05-05 2023-03-31 13F Biogen Idec COM 09062X103 4,885 24 0.49 1,358 0.89 0.5299
2023-02-14 2022-12-31 13F Biogen Idec COM 09062X103 4,861 180 3.85 1,346 7.68 0.5560
2022-11-09 2022-09-30 13F Biogen Idec COM 09062X103 4,681 7 0.15 1,250 31.16 0.5857
2022-08-04 2022-06-30 13F Biogen Idec COM 09062X103 4,674 4,674 953 0.4153
2020-05-08 2020-03-31 13F Biogen Idec COM 09062X103 0 -2,713 -100.00 0 -100.00
2020-02-11 2019-12-31 13F Biogen Idec COM 09062X103 2,713 -202 -6.93 805 18.56 0.4028
2019-11-12 2019-09-30 13F Biogen Idec COM 09062X103 2,915 -75 -2.51 679 -2.86 0.3705
2019-08-14 2019-06-30 13F Biogen Idec COM 09062X103 2,990 -102 -3.30 699 -4.38 0.3886
2019-05-13 2019-03-31 13F Biogen Idec COM 09062X103 3,092 -170 -5.21 731 -25.56 0.4077
2019-02-14 2018-12-31 13F Biogen Idec COM 09062X103 3,262 14 0.43 982 -14.46 0.6849
2018-11-14 2018-09-30 13F Biogen Idec COM 09062X103 3,248 -1,348 -29.33 1,148 -13.94 0.7805
2018-08-03 2018-06-30 13F Biogen Idec COM 09062X103 4,596 47 1.03 1,334 7.06 0.9480
2018-05-14 2018-03-31 13F Biogen Idec COM 09062X103 4,549 -56 -1.22 1,246 -15.06 0.9265
2018-02-13 2017-12-31 13F Biogen Idec COM 09062X103 4,605 -739 -13.83 1,467 -12.31 1.0433
2017-11-13 2017-09-30 13F Biogen Idec COM 09062X103 5,344 -244 -4.37 1,673 10.36 1.2738
2017-08-11 2017-06-30 13F Biogen Idec COM 09062X103 5,588 -102 -1.79 1,516 -2.57 1.1925
2017-05-11 2017-03-31 13F Biogen Idec COM 09062X103 5,690 120 2.15 1,556 -1.52 1.2544
2017-02-13 2016-12-31 13F Biogen Idec COM 09062X103 5,570 107 1.96 1,580 -7.60 1.1941
2016-11-10 2016-09-30 13F Biogen Idec COM 09062X103 5,463 -78 -1.41 1,710 27.61 1.3403
2016-08-10 2016-06-30 13F Biogen Idec COM 09062X103 5,541 150 2.78 1,340 -4.49 1.0457
2016-05-13 2016-03-31 13F Biogen Idec COM 09062X103 5,391 1,770 48.88 1,403 26.51 1.1073
2016-02-16 2015-12-31 13F Biogen Idec COM 09062X103 3,621 1,390 62.30 1,109 70.35 0.9043
2015-11-13 2015-09-30 13F Biogen Idec COM 09062X103 2,231 2,231 651 0.5089
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.