BIOGEN INC · CUSIP 09062X103 · CIK 932540
As of 2025-09-30, GROUP ONE TRADING, L.P. reported 19.31K BIIB (shares), valued at $2.70M, or 0.08% of its reported non-derivative portfolio. Filed 2025-11-12.
Verify history & sources →Shares decreased 78.60%; reported value decreased 76.13%, and weight changed -0.29 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds.
Left: % · Right: Shares · Independently scaled axes
Exact data and methodology
Axes scale independently; a crossing does not mean equal values. Weight uses each quarter's total reported non-derivative value. Same CUSIP; missing quarters are gaps, not zero. Revised history may include later disclosures.
| Quarter | Weight | Quantity | Source |
|---|---|---|---|
| Q2 2026 | Not reported | Not reported | — |
| Q1 2026 | Not reported | Not reported | — |
| Q4 2025 | Not reported | Not reported | — |
| Q3 2025 | 0.08% | 19,310 | SEC filing ↗Filed Nov 12, 2025 |
| Q2 2025 | 0.37% | 90,218 | SEC filing ↗Filed Aug 14, 2025 |
| Q1 2025 | 0.07% | 12,377 | SEC filing ↗Filed May 14, 2025 |
| Q4 2024 | 0.30% | 57,921 | SEC filing ↗Filed May 14, 2025Amended |
| Q3 2024 | 1.22% | 159,235 | SEC filing ↗Filed Nov 14, 2024 |
| Q2 2024 | 0.85% | 116,653 | SEC filing ↗Filed Aug 14, 2024 |
| Q1 2024 | Not reported | Not reported | — |
| Q4 2023 | 0.10% | 12,786 | SEC filing ↗Filed Feb 14, 2024 |
| Q3 2023 | 0.09% | 9,248 | SEC filing ↗Filed Nov 9, 2023 |
History & evidence by quarter
| Quarter | Weight | Quantity | Value | Change explained | Source |
|---|---|---|---|---|---|
| Q3 2023 | 0.09% | 9,248 | $2.38M | The prior quarter is outside the free window. Sign in for the comparison. | SEC filing ↗ Filed Nov 9, 2023 |
| Q4 2023 | 0.10% | 12,786 | $3.31M | Shares increased 38.26%; reported value increased 39.20%, and weight changed +0.01 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Feb 14, 2024 |
| Q1 2024 | Not reported | — | — | This security is absent from this quarter's filing; a missing record is not treated as zero holdings. | — |
| Q2 2024 | 0.85% | 116,653 | $27.04M | A comparable prior-quarter record is unavailable; changes are not inferred. | SEC filing ↗ Filed Aug 14, 2024 |
| Q3 2024 | 1.22% | 159,235 | $30.87M | Shares increased 36.50%; reported value increased 14.14%, and weight changed +0.37 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Nov 14, 2024 |
| Q4 2024 | 0.30% | 57,921 | $8.86M | Shares decreased 63.63%; reported value decreased 71.30%, and weight changed -0.92 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed May 14, 2025 |
| Q1 2025 | 0.07% | 12,377 | $1.69M | Shares decreased 78.63%; reported value decreased 80.88%, and weight changed -0.23 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed May 14, 2025 |
| Q2 2025 | 0.37% | 90,218 | $11.33M | Shares increased 628.92%; reported value increased 568.99%, and weight changed +0.30 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Aug 14, 2025 |
| Q3 2025 | 0.08% | 19,310 | $2.70M | Shares decreased 78.60%; reported value decreased 76.13%, and weight changed -0.29 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Nov 12, 2025 |
| Q4 2025 | Not reported | — | — | This security is absent from this quarter's filing; a missing record is not treated as zero holdings. | — |
| Q1 2026 | Not reported | — | — | This security is absent from this quarter's filing; a missing record is not treated as zero holdings. | — |
| Q2 2026 | Not reported | — | — | This security is absent from this quarter's filing; a missing record is not treated as zero holdings. | — |
Take these holdings further.
This page includes 12 of 12 reported holdings. Sign in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.
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Sources, coverage & how to read this data
Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.