Biogen Inc.
US ˙ NasdaqGS ˙ US09062X1037

SecurityBIIB / Biogen Inc.
InstitutionPitcairn Co
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Pitcairn Co closes position in BIIB / Biogen Inc.

On February 12, 2026 - Pitcairn Co filed a 13F-HR form disclosing ownership of 0 shares of Biogen Inc. (US:BIIB) valued at $0 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 12, 2025 disclosing 10,192 shares of Biogen Inc.. This represents a change in shares of -100.00% during the quarter. The current value of the position is $0 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)
2026-02-12 2025-12-31 13F BIOGEN COM 09062X103 0 -10,192 -100.00 0 -100.00
2025-11-12 2025-09-30 13F BIOGEN COM 09062X103 10,192 2,738 36.73 1,428 52.46 0.1127
2025-08-19 2025-06-30 13F/A-1 BIOGEN COM 09062X103 7,454 7,454 936 0.0613
2025-08-14 2025-06-30 13F BIOGEN COM 09062X103 5,034 5,034 323 0.0190
2025-02-12 2024-12-31 13F BIOGEN COM 09062X103 0 -1,099 -100.00 0 -100.00
2024-11-12 2024-09-30 13F BIOGEN COM 09062X103 1,099 -317 -22.39 213 -35.06 0.0126
2024-08-13 2024-06-30 13F BIOGEN COM 09062X103 1,416 -175 -11.00 328 -4.37 0.0200
2024-05-13 2024-03-31 13F BIOGEN COM 09062X103 1,591 -61 -3.69 343 -19.67 0.0222
2024-02-14 2023-12-31 13F BIOGEN COM 09062X103 1,652 -55 -3.22 427 -2.51 0.0328
2023-11-13 2023-09-30 13F BIOGEN COM 09062X103 1,707 53 3.20 439 -7.01 0.0374
2023-08-11 2023-06-30 13F BIOGEN IDEC COM 09062X103 1,654 -14 -0.84 471 1.73 0.0408
2023-05-05 2023-03-31 13F BIOGEN IDEC COM 09062X103 1,668 -30 -1.77 464 -1.49 0.0426
2023-02-13 2022-12-31 13F BIOGEN IDEC COM 09062X103 1,698 1 0.06 470 3.75 0.0469
2022-11-14 2022-09-30 13F BIOGEN IDEC COM 09062X103 1,697 -1,351 -44.32 453 -27.17 0.0490
2022-08-12 2022-06-30 13F BIOGEN IDEC COM 09062X103 3,048 -176 -5.46 622 -8.39 0.0657
2022-05-12 2022-03-31 13F BIOGEN IDEC COM 09062X103 3,224 -618 -16.09 679 -26.36 0.0591
2022-02-14 2021-12-31 13F BIOGEN IDEC COM 09062X103 3,842 -4,077 -51.48 922 -58.86 0.0593
2021-11-10 2021-09-30 13F BIOGEN IDEC COM 09062X103 7,919 663 9.14 2,241 -10.82 0.1548
2021-08-11 2021-06-30 13F BIOGEN IDEC COM 09062X103 7,256 -1,107 -13.24 2,513 7.44 0.1686
2021-05-10 2021-03-31 13F BIOGEN IDEC COM 09062X103 8,363 -480 -5.43 2,339 8.04 0.1661
2021-02-05 2020-12-31 13F BIOGEN IDEC COM 09062X103 8,843 2,110 31.34 2,165 13.35 0.1653
2020-11-03 2020-09-30 13F BIOGEN IDEC COM 09062X103 6,733 1,794 36.32 1,910 44.48 0.1623
2020-07-28 2020-06-30 13F BIOGEN IDEC COM 09062X103 4,939 2,680 118.64 1,322 84.90 0.1271
2020-05-13 2020-03-31 13F BIOGEN IDEC COM 09062X103 2,259 311 15.97 715 23.70 0.0846
2020-02-12 2019-12-31 13F BIOGEN IDEC COM 09062X103 1,948 -1,670 -46.16 578 -31.35 0.0535
2019-11-12 2019-09-30 13F BIOGEN IDEC COM 09062X103 3,618 227 6.69 842 6.18 0.0829
2019-08-12 2019-06-30 13F BIOGEN IDEC COM 09062X103 3,391 -56 -1.62 793 -2.70 0.0793
2019-05-07 2019-03-31 13F BIOGEN IDEC COM 09062X103 3,447 -186 -5.12 815 -25.43 0.0885
2019-02-12 2018-12-31 13F BIOGEN IDEC COM 09062X103 3,633 -223 -5.78 1,093 -19.81 0.1211
2018-11-02 2018-09-30 13F BIOGEN IDEC COM 09062X103 3,856 -157 -3.91 1,363 17.00 0.1413
2018-08-02 2018-06-30 13F BIOGEN IDEC COM 09062X103 4,013 -236 -5.55 1,165 0.17 0.1238
2018-05-11 2018-03-31 13F BIOGEN IDEC COM 09062X103 4,249 -264 -5.85 1,163 -19.12 0.1234
2018-02-13 2017-12-31 13F BIOGEN IDEC COM 09062X103 4,513 -70 -1.53 1,438 0.21 0.1435
2017-11-03 2017-09-30 13F BIOGEN IDEC COM 09062X103 4,583 -240 -4.98 1,435 9.63 0.1625
2017-08-02 2017-06-30 13F BIOGEN IDEC COM 09062X103 4,823 -353 -6.82 1,309 -7.49 0.1572
2017-05-08 2017-03-31 13F BIOGEN IDEC COM 09062X103 5,176 -424 -7.57 1,415 -10.89 0.1714
2017-02-06 2016-12-31 13F BIOGEN IDEC COM 09062X103 5,600 -533 -8.69 1,588 -17.29 0.1963
2016-11-09 2016-09-30 13F BIOGEN IDEC COM 09062X103 6,133 138 2.30 1,920 32.41 0.2389
2016-07-25 2016-06-30 13F BIOGEN IDEC COM 09062X103 5,995 1,099 22.45 1,450 13.73 0.1860
2016-04-29 2016-03-31 13F BIOGEN IDEC COM 09062X103 4,896 833 20.50 1,275 2.41 0.1610
2016-02-10 2015-12-31 13F BIOGEN IDEC COM 09062X103 4,063 -211 -4.94 1,245 -0.24 0.1383
2015-11-02 2015-09-30 13F BIOGEN IDEC COM 09062X103 4,274 -118 -2.69 1,248 -29.65 0.1656
2015-08-06 2015-06-30 13F BIOGEN IDEC COM 09062X103 4,392 -108 -2.40 1,774 -6.63 0.2049
2015-05-14 2015-03-31 13F BIOGEN IDEC COM 09062X103 4,500 -527 -10.48 1,900 11.37 0.2099
2015-02-10 2014-12-31 13F BIOGEN IDEC COM 09062X103 5,027 -67 -1.32 1,706 1.25 0.1837
2014-11-12 2014-09-30 13F BIOGEN IDEC COM 09062X103 5,094 47 0.93 1,685 5.84 0.1887
2014-07-29 2014-06-30 13F BIOGEN IDEC COM 09062X103 5,047 -36 -0.71 1,592 2.38 0.1763
2014-05-13 2014-03-31 13F BIOGEN IDEC COM 09062X103 5,083 -4,045 -44.31 1,555 -39.07 0.1738
2014-05-13 2013-12-31 13F/A-1 BIOGEN IDEC COM 09062X103 9,128 -1,159 -11.27 2,552 3.03 0.2821
2014-02-12 2013-12-31 13F BIOGEN IDEC COM 09062X103 4,986 1,394
2013-11-05 2013-09-30 13F BIOGEN IDEC COM 09062X103 10,287 -48 -0.46 2,477 11.38 0.3035
2013-08-14 2013-06-30 13F BIOGEN IDEC COM 09062X103 10,335 10,335 2,224 0.2976
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.