Nifty Option Greeks: A Practical Summary

Greeks are the risk dials of every Nifty position. Delta measures directional exposure: an ATM call has Delta ~0.5, deep ITM ~1.0, OTM ~0.2. Gamma is the rate Delta changes; it peaks ATM and explodes near expiry, which is why expiry-day ATM options are dangerous. Theta is daily time decay — writers collect it, buyers bleed it; near weekly expiry Theta accelerates exponentially in the final 48 hours. Vega is sensitivity to implied volatility; long Vega wins when IV rises. Rho is rate sensitivity, usually minor for index options.

An AI model uses these as features: high Gamma plus high Theta near expiry triggers a filter that blocks naked buys regardless of predicted direction. Understanding the dials precedes the model; the model only quantifies what Greeks describe. Retail traders who ignore Greeks are trading blind — the math decides outcomes more than the thesis.

Q: What is Delta in Nifty options?
A: Delta is the expected change in option price per 1 point move in Nifty. ATM ~0.5, ITM ~1.0, OTM ~0.2.

Q: Why does Gamma spike near expiry?
A: Gamma measures how fast Delta changes. At ATM it is maximal, and with only hours left it accelerates, flipping an ATM call's Delta within a small move.

Q: Is Theta always bad for buyers?
A: Yes for holders — Theta decays premium daily, fastest in the last two days. Sellers benefit from collecting it.

Q: How do AI models use Greeks?
A: As features in a classifier plus a risk filter: e.g. block naked buys when Gamma and Theta are both high near expiry.