Part 13: Directional Options Buying & Momentum Strategies

Unlike option selling where time decay (theta) is your friend, option buying is a race against time. Option buyers have a negative theta decay curve, meaning if the market goes sideways, the option value decays to zero. To be profitable in options buying, you must master directional momentum and trade during periods of high volatility.

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1. Option Buying Greek Dynamics

• Delta (Directional Velocity): ATM options have a Delta of ~0.50. When Nifty moves by 10 points, your ATM option moves by 5 points.
• Gamma (Acceleration): Gamma is the rate of change of Delta. ATM options have the highest Gamma. On expiry days, Gamma is extremely high, causing small moves in the index to trigger exponential jumps in option premium (e.g. ₹10 to ₹80). This is known as "hero-or-zero" trading.
• Vega (Volatility Sensitivity): Option prices rise when Implied Volatility (IV) increases. As an option buyer, you want to buy when IV is low and sell when IV spikes (e.g. before election results, corporate earnings).

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2. Intraday Opening Range Breakout (ORB) on Index Options

A mechanical option buying strategy designed for the opening hour.

• Setup: Nifty 50 or Bank Nifty Index.
• Timeframe: 5-minute candles.
• Rules:
  1. Identify the high and low of the first three 5-minute candles (9:15 AM to 9:30 AM).
  2. Long Setup: If a 5-minute candle closes above the 9:15-9:30 AM high, buy 1 lot of ATM Call (CE) option.
  3. Short Setup: If a 5-minute candle closes below the 9:15-9:30 AM low, buy 1 lot of ATM Put (PE) option.
  4. Stop Loss: Set SL at the low of the breakout candle or a flat 20% of the option entry price.
  5. Exit: Target a 1:2 R:R (e.g., if you risk ₹10, target ₹20 profit) or square off at 3:10 PM.

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3. Expiry Day Scalping (RSI Crossover + Volume)

India has index expiries every day of the week. This strategy capitalizes on rapid swings on expiry days.

• Setup: Expiry Index (e.g., Bank Nifty on Wednesdays, Nifty on Thursdays).
• Timeframe: 3-minute candles.
• Indicators: Relative Strength Index (RSI) set to 14 periods.
• Execution Rules:
  1. Look for RSI crossovers of 40 and 60.
  2. Bullish Trigger: Buy ATM CE when RSI crosses above 60 on a candle with volume higher than the 10-period moving average volume.
  3. Bearish Trigger: Buy ATM PE when RSI crosses below 40 on a volume spike.
  4. Stop Loss: Strict 30% stop-loss from entry. If not hit, options decay quickly; never average a losing buy position.
  5. Trailing: Trail stop-loss to cost once the option moves 20% in your favor.

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4. Option Buying Rules for Capital Preservation

Options buying has a high failure rate because of decay. Retail developers must implement strict system guards:

• Never hold overnight: Decay will erode your premiums during market close.
• Fixed Position Sizing: Allocate a maximum of 5% of your total trading capital to any single option buying trade.
• No averaging: If a buy trade goes to loss, do not buy more to lower average cost.

In the next part, we cover futures trading mechanics and Cash-Future arbitrage.

Proceed to Part 14: Index Futures & Cash-Future Arbitrage →