What Are Options Greeks?
Options Greeks are mathematical values that describe how an option's price changes in response to different variables. They help traders understand risk exposure and make better decisions.
Delta (Δ) — Directional Exposure
What It Measures
How much the option price changes for every ₹1 move in the underlying.
Values
Call options: Delta ranges from 0 to +1Put options: Delta ranges from -1 to 0ATM options: Delta ≈ ±0.50Practical Example
If you own a Nifty 22000 CE with delta 0.50:
Nifty moves up ₹100 → Option gains approximately ₹50Nifty moves down ₹100 → Option loses approximately ₹50Quick Interpretation
Delta 0.70 = ~70% probability of expiring in the moneyHigher delta = more like owning the underlyingLower delta = more speculative, cheaper premiumTheta (Θ) — Time Decay
What It Measures
How much value an option loses per day due to time passing.
Key Points
Always negative: for option buyers (you lose time value daily)Always positive: for option sellers (you earn time value daily)Theta accelerates as expiry approachesATM options have the highest thetaPractical Example
Nifty 22000 CE with theta -15:
Each day, the option loses approximately ₹15 in value (all else equal)If you hold it for 5 days without movement: Lost ~₹75 to time decayTheta in Indian Markets
Weekly options (Nifty/Sensex) have extreme theta in the last 2 days"Theta farming" — selling options to collect time decay — is popularThursday expiry trades have rapid premium erosion on WednesdayVega (ν) — Volatility Sensitivity
What It Measures
How much the option price changes for a 1% change in implied volatility (IV).
Key Points
Higher vega = more sensitive to volatility changesLong options have positive vega (benefit from IV increase)Short options have negative vega (benefit from IV decrease)ATM options have the highest vegaPractical Example
If vega = 10 and IV rises by 2%:
Option price increases by approximately ₹20India VIX Connection
India VIX measures market's expected volatilityRising VIX = options become more expensiveFalling VIX = options become cheaperBefore major events (budget, elections), VIX spikesGamma (Γ) — Delta's Rate of Change
What It Measures
How much delta changes for every ₹1 move in the underlying.
Key Points
Highest for ATM optionsIncreases dramatically near expiryCritical for options sellers (gamma risk)Why Gamma Matters
Near expiry, ATM options can swing wildly (high gamma)This is why selling ATM options on expiry day is riskyGamma squeeze: Large moves amplified by dealers hedgingUsing Greeks Together
Example Trade Analysis
You buy Nifty 22000 CE for ₹200:
Delta 0.50: Need Nifty to move ₹400+ just to break evenTheta -15: Losing ₹15/day to time decayVega 12: A 2% IV increase adds ₹24Gamma 0.02: As Nifty moves ₹50 up, delta becomes 0.51Decision Framework
Directional trade?: Focus on delta and gammaTime-based trade?: Focus on thetaEvent trade?: Focus on vega (IV expansion/contraction)Risk management?: Monitor all GreeksHow Pinbar AI Helps Options Traders
Track options P&L including premium decayAnalyze your performance by option type (CE/PE, strike selection)Behavioral insights: Are you holding losing options too long?Time-of-trade analysis for expiry day trading
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