Introduction to Options

NISM Series V-D | Chapter 16 | 13 marks out of 150

What this chapter is about

Study the concepts below for Chapter 16 of NISM Series V-D. This chapter carries 13 marks out of 150.

Key concepts

Call Option - right to BUY the underlying at the strike price on or before expiry. Buyer is bullish. Seller is bearish or neutral.

Put Option - right to SELL the underlying at the strike price on or before expiry. Buyer is bearish. Seller is bullish or neutral.

Strike Price (Exercise Price) - the fixed price at which you can buy (call) or sell (put). NOT the market price. This is the most common trap in the exam.

Option Premium - what the buyer pays to the seller for the right. Made up of two parts:

• Intrinsic Value = amount the option is in-the-money (minimum zero, never negative)
• Time Value = everything else (uncertainty, time remaining, volatility)

Moneyness - where the option sits relative to the market:

• ITM (In the Money) → profitable to exercise right now
• ATM (At the Money) → strike = spot price
• OTM (Out of the Money) → not profitable to exercise, intrinsic value = zero

European vs American Options - In India, ALL index options (Nifty, Bank Nifty) are European - exercise only on expiry day. Stock options are physically settled. This comes up frequently.

Expiry - Last Thursday of the month (or day before if Thursday is a holiday). *Update: NSE shifted to Tuesday from September 2025.*

The 5 Greeks - this is where the exam fights you

Think of Greeks as sensitivity meters. Each one measures how much the option premium moves when one specific thing changes.

Delta deep dive - the most tested Greek:

• Deep ITM call → Delta near 1 (moves almost like the stock)
• ATM call → Delta near 0.5
• Deep OTM call → Delta near 0 (barely moves)
• Put Delta ranges from 0 to -1 (opposite direction)

Vega - higher volatility = higher premium for BOTH calls and puts. Makes sense - more volatility = more chance of a big move = option worth more.

Theta - the silent killer. Every day that passes, the time value portion of the premium decays. This decay accelerates as expiry approaches. Theta hurts option buyers, benefits option sellers.

Rho - interest rate goes up → call premium goes up, put premium goes down. Think of it as cost of carry.

Real market example - Nifty options

It's expiry week. Nifty is at 24,500. You buy a 24,500 CE (Call option, ATM) for ₹150 premium. Lot size = 75.

Your cost: ₹150 × 75 = ₹11,250

If Nifty rises to 24,800 by expiry:

• Intrinsic value = 24,800 - 24,500 = ₹300
• You receive ₹300 × 75 = ₹22,500
• Profit = ₹22,500 - ₹11,250 = ₹11,250

If Nifty stays at 24,500 or falls:

• Option expires worthless (OTM or ATM at expiry = zero intrinsic value)
• You lose the full premium: ₹11,250
• Maximum loss for buyer = premium paid (always)
• Maximum gain for buyer = unlimited (theoretically)

For the seller of that same call:

• Maximum gain = ₹11,250 (the premium received)
• Maximum loss = unlimited (if Nifty rockets to 30,000, seller bleeds)

This is the asymmetry of options - buyer has limited risk, unlimited upside. Seller has limited gain, unlimited risk.

Payoff summary - memorise this table

Trap Alert - the 5 questions students consistently get wrong

Trap 1: "A call option gives the buyer the right to buy at MARKET price" → FALSE The right is to buy at the STRIKE price, not market price. The whole point of an option is locking in a price. If it was market price, why would you need the option?

Trap 2: "Vega measures change in delta" → FALSE. That's Gamma. Memory hook: Vega = Volatility. Gamma = Gradient of delta (rate of change).

Trap 3: "Theta measures sensitivity to volatility" → FALSE. That's Vega. Memory hook: Theta = Time. Vega = Volatility. Never mix these two.

Trap 4: "Delta is the change in option price for a 1% change in interest rates" → FALSE. That's Rho. Delta = price sensitivity. Rho = rate sensitivity.

Trap 5: "A long put can be closed by shorting a call with same strike and expiry" → FALSE. You close a long put by SELLING the same put (same strike, same expiry). You can only close an option position with the SAME type of option - put with put, call with call.

Must-remember numbers and rules

• Delta range: Calls = 0 to +1 | Puts = 0 to -1
• Far OTM option → Delta near 0
• Deep ITM option → Delta near +1 (call) or -1 (put)
• ATM option → Delta near 0.5 (call) or -0.5 (put)
• Intrinsic value = never negative (minimum is zero)
• Time value = zero at expiry (only intrinsic value remains)
• Higher volatility = higher premium (both calls and puts)
• Higher interest rates = higher call premium, lower put premium
• Option buyers pay premium → margin not required
• Option sellers receive premium → initial margin required (unlimited risk)
• In India, index options = European style (exercise only at expiry)
• Option lot quantity = only the specified lot size, not more or less

Series V-D exam weight

This chapter carries 13 marks out of 150. Use the Series V-D syllabus and mock tests to plan your revision.

Quick revision - 60 second scan before exam

• Call = right to BUY at strike | Put = right to SELL at strike
• Buyer pays premium, has right | Seller receives premium, has obligation
• ITM = profitable | ATM = strike equals spot | OTM = intrinsic value zero
• Premium = Intrinsic Value + Time Value
• Delta (price) | Gamma (delta's rate) | Theta (time) | Vega (volatility) | Rho (rates)
• Buyer max loss = premium | Seller max loss = unlimited (call) / strike price (put)
• Close positions with SAME option type, same strike, same expiry
• All index options in India = European style