Biogen Inc annual shares outstanding for fiscal TTM was 148 million shares, an increase of 0.7% from 147 million shares in fiscal 2025. All figures are reported results from public filings — no estimates or projections.
| Shares Outstanding (annual) | TTM → 2026-03-31 | 2025-12-31 | 2024-12-31 | 2023-12-31 | 2022-12-31 | 2021-12-31 | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 | 2008-12-31 | 2007-12-31 | 2006-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shares Outstanding (M) | 148M | 147M | 146M | 146M | 146M | 150M | 161M | 187M | 205M | 213M | 219M | 231M | 237M | 238M | 240M | 245M | 255M | 289M | 295M | 320M | 345M |
USD; $M / $B as marked. Newest period first. Source: public company filings (via Yahoo Finance aggregation).
| Shares Outstanding (quarterly) | 2026-03-31 | 2025-12-31 | 2025-09-30 | 2025-06-30 | 2025-03-31 | 2024-12-31 | 2024-09-30 | 2024-06-30 |
|---|---|---|---|---|---|---|---|---|
| Shares Outstanding (M) | 148M | 147M | 147M | 146M | 146M | 146M | 146M | 146M |
USD; $M / $B as marked. Newest period first. Source: public company filings (via Yahoo Finance aggregation).
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