Delta
Delta measures how much an option's price changes for a ₹1 move in the underlying. A Nifty call with delta 0.5 moves approximately ₹0.50 per ₹1 Nifty move. Delta ranges 0 to 1 for calls, 0 to -1 for puts. Also represents rough probability of finishing ITM.
Gamma
Gamma measures how fast delta changes. Near-the-money options have the highest gamma — delta can swing dramatically with small underlying moves. Gamma risk is real for short-options sellers.
Theta
Theta measures time decay — how much option value erodes per day, all else equal. Theta is the enemy of long options and the friend of short options. Near expiry, theta acceleration is significant.
Vega
Vega measures sensitivity to implied volatility. Higher India VIX = higher option prices. Vega exposure is what option-selling strategies are really taking risk on.
Why retail doesn't think in greeks
Most retail traders buy weekly OTM options without understanding theta — which is why most weekly buyers lose. The greeks are not a nice-to-know; they are the pricing model. Systematic engines like Sleeping Trade use them as first-class inputs.
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