Plain English
Basis risk is the risk that your hedge does not perfectly track what you are hedging. Short a BTC perp against spot BTC: usually a tight hedge, but funding spikes or exchange dislocations can break the relationship for hours or days, creating P&L swings that should not exist in a “neutral” position.
How it actually works
The basis is the price difference between two instruments meant to track the same thing. For futures: the difference between spot and the futures price. For derivatives in general: the spread between hedge and underlying. Basis can widen during stress (March 2020, FTX collapse, liquidation cascades) — exactly when you need the hedge most.
What it means for you
For HNW basis traders and delta-neutral strategies, basis risk is the actual risk you are taking — not directional risk. Manage it by using deeply liquid venues, sizing within a fraction of order-book depth, and keeping dry powder to ride out basis blowouts without forced unwinds. Knowing what your maximum basis stress could be — and surviving it — is the difference between a strategy that survives a cycle and one that does not.
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Educational content only. Not investment, tax, or legal advice.