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Next filing · Form 10-Q · Q3 2026 · 63 days
Next filing · Form 10-Q · Q3 2026 · 63 daysMethodology Paper · Part III published: The One Manager Skill That PersistsAPI Update · Point-in-Time (PIT) historical commit tracking — securities and funds unifiedAPI Update · ERM3 L3 variance partition — institutional transparency releasePart 3 · The Persistence of Stock-Selection ResidualsPart 1 · One Position, Four BetsNext filing · Form 10-Q · Q3 2026 · 63 daysMethodology Paper · Part III published: The One Manager Skill That PersistsAPI Update · Point-in-Time (PIT) historical commit tracking — securities and funds unifiedAPI Update · ERM3 L3 variance partition — institutional transparency releasePart 3 · The Persistence of Stock-Selection ResidualsPart 1 · One Position, Four Bets
Ledger

Risk decomposition

BRK-B

Market → sector → subsector → α-residual · 2026-03-16 → 2026-09-03

BRK-B factor & risk decomposition snapshot
Market
+2.8%
Sector
+3.8%
Subsector
+1.4%
α residual
-4.7%
Stock
+3.2%

Every position carries the market, its sector, and its subsector before any stock-specific move. The waterfall splits BRK-B'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=BRK-B&years=1

How the decomposition works →Research →Run BRK-B on riskmodels.net →Run any ticker via the API →

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