Risk decomposition
BAC
Market → sector → subsector → α-residual · 2026-05-01 → 2026-10-21

Market
+5.9%
Sector
+4.0%
Subsector
-2.0%
α residual
-11.5%
Stock
-3.6%
Every position carries the market, its sector, and its subsector before any stock-specific move. The waterfall splits BAC's realized return into those benchmark layers; the α residual is what the three hedge layers do not explain.
source: RiskModels — GET /ticker-returns?ticker=BAC&years=1