Options Bootcamp
Options 103: The 6 Forces Driving Price
Option pricing is not random. It is driven by six quantifiable factors. Understanding these is the key to predicting how your position will perform.
The 4 Major Determinants
The price of an option is primarily driven by four factors:
1. Stock Price: The most obvious factor. As the stock moves up, calls gain value and puts lose value.
2. Striking Price: Options with better strikes (lower for calls, higher for puts) cost more.
3. Time Remaining: More time = Higher Price. A 6-month option costs more than a 1-month option because there is more time for the stock to move.
4. Volatility: The "Excitement" factor. If a stock is wild (highly volatile), its options are expensive because the chance of a huge payout is higher.
The 2 Minor Determinants
5. Interest Rates: Higher risk-free rates (like T-Bills) generally slightly increase call premiums and decrease put premiums.
6. Dividends: Dividends lower the stock price on the ex-date. Therefore, high dividends lower Call prices and increase Put prices.
The Volatility Factor
Volatility is unique because it is the only unknown factor. We know the stock price, time, and strike today. We don't know how much the stock will fluctuate tomorrow.
Market Makers increase option prices when fear/uncertainty is high (High Implied Volatility) and decrease them when the market is calm.
Key takeaways
- Stock Price and Time are the biggest drivers.
- Volatility acts as a multiplier—high volatility makes all options more expensive.
- Dividends hurt Call owners and help Put owners.
- Interest rates have a minor but mathematically present impact.
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