What Is Gamma? Warrant Gamma Explained
What is gamma in a structured warrant — how it measures the rate of change of delta, why it peaks near the strike, and what it means for trading near expiry.
By warrants.asia Editorial Team · Published July 21, 2026
What is gamma?
Gamma measures how quickly a warrant's delta changes as the underlying price moves. If delta describes a warrant's current sensitivity, gamma describes how fast that sensitivity itself is shifting — a warrant with high gamma can go from barely reacting to the underlying to reacting strongly after a relatively small move.
Gamma is highest for at-the-money warrants close to expiry, and lowest for warrants that are deep in- or out-of-the-money, where delta has already settled near its extreme (close to 1, -1, or 0) and has little room left to change.
Why gamma matters for traders
High gamma means a position's effective exposure can change quickly without the trader doing anything — a warrant that started with modest delta can develop a much larger delta after the underlying makes a move toward the strike, amplifying gains (or losses) faster than a simple gearing estimate would suggest.
This is particularly relevant for at-the-money warrants in the final weeks before expiry, where gamma tends to spike: small moves in the underlying can produce outsized swings in the warrant's price precisely because delta is shifting so fast.
Gamma and the other greeks
Gamma doesn't act alone — the same at-the-money, near-expiry warrants with high gamma also tend to have the fastest theta (time decay), since both effects intensify as expiry approaches and the outcome (in- or out-of-the-money) becomes more binary. Traders who understand gamma tend to also watch theta and implied volatility together, rather than any single greek in isolation.
FAQ
What is gamma in a structured warrant?
Gamma measures how quickly a warrant's delta changes as the underlying price moves — high gamma means delta shifts fast, so the warrant's sensitivity to the underlying isn't constant.
When is gamma highest?
Gamma is typically highest for at-the-money warrants close to expiry, and lowest for warrants deep in- or out-of-the-money, where delta has already settled near its extreme.
Why does gamma matter for a trader?
High gamma means a position's effective delta — and therefore its exposure — can change quickly as the underlying moves, which can amplify gains or losses faster than gearing alone would suggest.
Related guides
Sources
- Warrant-Hedging (Black-Scholes pricer, open source) — GitHub / caramel2001
Key resources
Structured warrants homepage · Pricing calculator · Glossary · HSI warrants guide · CBBCs guide
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