Biogen Inc.
MX ˙ BMV ˙ US09062X1037
SecurityMX:BIIB / Biogen Inc.
InstitutionQuantinno Capital Management LP
Latest Disclosed Ownership116,374 shares
Latest Disclosed Value $ 21,335,000
Quantinno Capital Management LP reports 18.35% increase in ownership of BIIB / Biogen Inc.

On May 15, 2026 - Quantinno Capital Management LP filed a 13F-HR form disclosing ownership of 116,374 shares of Biogen Inc. (MX:BIIB) valued at $21,335,000 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 98,333 shares of Biogen Inc.. This represents a change in shares of 18.35% during the quarter.

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)
2026-05-15 2026-03-31 13F BIOGEN COM 09062X103 116,374 18,041 18.35 21,335 23.29 0.0356
2026-02-17 2025-12-31 13F BIOGEN COM 09062X103 98,333 30,481 44.92 17,306 82.08 0.0348
2025-11-14 2025-09-30 13F BIOGEN COM 09062X103 67,852 13,686 25.27 9,505 39.72 0.0259
2025-08-14 2025-06-30 13F BIOGEN COM 09062X103 54,166 37,440 223.84 6,803 197.29 0.0294
2025-05-12 2025-03-31 13F BIOGEN COM 09062X103 16,726 10,442 166.17 2,289 138.09 0.0149
2025-02-14 2024-12-31 13F BIOGEN COM 09062X103 6,284 3,215 104.76 961 61.51 0.0095
2024-11-14 2024-09-30 13F BIOGEN COM 09062X103 3,069 -5,172 -62.76 595 -68.85 0.0077
2024-08-14 2024-06-30 13F BIOGEN COM 09062X103 8,241 -5,765 -41.16 1,910 -36.75 0.0344
2024-05-14 2024-03-31 13F BIOGEN COM 09062X103 14,006 11,956 583.22 3,020 469.81 0.0656
2024-02-14 2023-12-31 13F BIOGEN COM 09062X103 2,050 -4,106 -66.70 530 -66.50 0.0186
2023-11-14 2023-09-30 13F BIOGEN COM 09062X103 6,156 1,306 26.93 1,582 14.47 0.0720
2023-08-04 2023-06-30 13F BIOGEN COM 09062X103 4,850 1,471 43.53 1,382 47.18 0.0789
2023-05-03 2023-03-31 13F BIOGEN COM 09062X103 3,379 -268 -7.35 939 -7.03 0.0621
2023-02-13 2022-12-31 13F BIOGEN COM 09062X103 3,647 3,647 1,010 0.0753
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.