Earnings Per Share
Shares (Basic)
Biogen Shares (Basic) increased by 147100.0% to 147.2M in Q1 2026 compared to the prior quarter. Year-over-year, this metric grew by 0.8%, from 146.1M to 147.2M.
Analysis
StatementIncome Statement
SectionEarnings Per Share
CategoryCapital Allocation
SignalContext dependent
VolatilityStable
First reportedQ1 2014
Last reportedQ1 2026
How to read this metric
Changes reflect share buybacks (decrease) or equity issuance (increase), which impact the per-share earnings calculation.
Detailed definition
The average number of common shares outstanding during the reporting period, calculated by weighting the number of share...
Peer comparison
Standard metric for all public companies; reflects capital structure and share repurchase activity.
Metric ID:
weighted_shares_basicHistorical Data
17 periods
| Q2 '21 | Q3 '21 | Q1 '22 | Q2 '22 | Q3 '22 | Q1 '23 | Q2 '23 | Q3 '23 | Q1 '24 | Q2 '24 | Q3 '24 | Q4 '24 | Q1 '25 | Q2 '25 | Q3 '25 | Q4 '25 | Q1 '26 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Value | 149.7M | 148M | 147.1M | 145.9M | 144.4M | 144.4M | 144.7M | 144.8M | 145.2M | 145.6M | 145.7M | 100K | 146.1M | 146.5M | 146.6M | 100K | 147.2M |
| QoQ Change | — | -1.1% | -0.6% | -0.8% | -1.0% | +0.0% | +0.2% | +0.1% | +0.3% | +0.3% | +0.1% | -99.9% | >999% | +0.3% | +0.1% | -99.9% | >999% |
| YoY Change | — | — | — | -2.5% | -2.4% | -1.8% | -0.8% | +0.3% | +0.6% | +0.6% | +0.6% | — | +0.6% | +0.6% | +0.6% | +0.0% | +0.8% |
Range100K – 149.7M
CAGR-0.4%
Avg YoY Growth-0.2%
Median YoY Growth+0.6%
Shares (Basic) at Other Companies
Frequently Asked Questions
- What is Biogen's shares (basic)?
- Biogen (BIIB) reported shares (basic) of 147.2M in Q1 2026.
- How has Biogen's shares (basic) changed year-over-year?
- Biogen's shares (basic) increased by 0.8% year-over-year, from 146.1M to 147.2M.
- What does shares (basic) mean?
- The average number of shares held by investors during the period.