+10.6%
SPCX vs BIIB
+2.8%
+7.8%
-8.4%
Performance
Returns, benchmark comparison, and relative performance.
Performance by timeframe
Returns for 2026-08-08 to 2026-09-08.
| Period | Portfolio | BIIB | Excess | Alpha |
|---|---|---|---|---|
| 1D | +3.7% | -3.8% | +7.5% | +4.6% |
| 7D | +7.9% | -1.6% | +9.5% | +8.2% |
| All | +10.6% | +2.8% | +7.8% | +9.9% |
Cumulative growth
Daily Returns
Daily percentage return beside BIIB.
Daily Out/Under-Performance
Portfolio return minus BIIB return. Positive bars indicate outperformance.
Daily Alpha
Portfolio daily return minus β × BIIB return. Early observations use the first valid beta; later observations use the trailing beta estimated for each date.
Cumulative Out/Under-Performance
Relative wealth over 2026-08-08 to 2026-09-08: compounded portfolio wealth divided by compounded BIIB wealth, less one. Both series rebase at the selected span's start.
Cumulative Alpha
Compounded beta-adjusted residual returns apply the first valid beta to early observations, then the trailing beta ending on each date.
Updating return analytics…
2026-08-08 to 2026-09-08 analysis · Full analysis span regression · Available span rolling