Biogen Inc.
DE ˙ DB ˙ US09062X1037
162,20 € ↑3,64 (2,30%)
2026-06-03
DEL PRIS
SecurityDE:IDP / Biogen Inc.
InstitutionOptas, LLC
Latest Disclosed Ownership1,656 shares
Latest Disclosed Value $ 303,593
Optas, LLC reports 2.93% decrease in ownership of IDP / Biogen Inc.

On April 24, 2026 - Optas, LLC filed a 13F-HR form disclosing ownership of 1,656 shares of Biogen Inc. (DE:IDP) valued at $257,094 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 1,706 shares of Biogen Inc.. This represents a change in shares of -2.93% during the quarter. The current value of the position is $268,603 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)
2026-04-24 2026-03-31 13F BIOGEN COM 09062X103 1,656 -50 -2.93 304 1.00 0.0266
2026-01-27 2025-12-31 13F BIOGEN COM 09062X103 1,706 73 4.47 300 31.58 0.0470
2025-10-15 2025-09-30 13F BIOGEN COM 09062X103 1,633 39 2.45 229 14.00 0.0388
2025-07-23 2025-06-30 13F BIOGEN COM 09062X103 1,594 1,594 200 0.0380
2022-01-25 2021-12-31 13F BIOGEN COM 09062X103 0 -801 -100.00 0 -100.00
2021-10-14 2021-09-30 13F BIOGEN COM 09062X103 801 4 0.50 226 -18.41 0.0657
2021-07-27 2021-06-30 13F BIOGEN COM 09062X103 797 1 0.13 277 24.22 0.0790
2021-04-19 2021-03-31 13F BIOGEN COM 09062X103 796 796 223 0.0699
2021-01-27 2020-12-31 13F BIOGEN COM 09062X103 0 -1,029 -100.00 0 -100.00
2020-10-23 2020-09-30 13F BIOGEN COM 09062X103 1,029 93 9.94 293 17.20 0.0895
2020-07-31 2020-06-30 13F BIOGEN COM 09062X103 936 -778 -45.39 250 -53.87 0.1013
2020-04-14 2020-03-31 13F BIOGEN COM 09062X103 1,714 -39 -2.22 542 4.03 0.2701
2020-02-14 2019-12-31 13F BIOGEN COM 09062X103 1,753 1,753 521 0.2011
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.