2011issue C0639
Weekly option tenor construction and premium drivers
Weekly equity options use the same pricing models and six premium inputs as regular listings. The listing calendar compresses theta, gamma, and implied-volatility risk into a six-to-seven-session window that belongs inside a broader book.
- Weekly equity options use the same pricing models, 100-share multiplier, and American-style exercise as regular listed contracts.
- A weekly option is listed so a trader can take a short-dated position while the regular front-month still has about two to five weeks remaining.
- Premium is assembled from underlying price, strike, time to expiration, dividends, interest rates, and implied volatility; rates and dividends are the least material inputs on this short tenor.
- Theta and gamma on weeklies intensify the same way they do on any contract near expiration, because maximum life is typically six or seven trading sessions.
A short-dated listing, not a new contract type
Weekly equity options use the same pricing models as regular listed contracts. They share the 100-share multiplier and American-style exercise, so the holder may exercise before expiration and a short position may be assigned early.
A weekly option is a standardized short-dated listed contract created when the regular front-month still has several weeks of life remaining. Weeklies exist so a trader can take that short-dated position when the regular front-month contract still has about two to five weeks remaining.
How the weekly calendar is built
A weekly is typically listed on the Thursday or Friday before expiration, so its maximum life is six or seven trading sessions. Weeklies expire on Friday, except that an exchange holiday on expiration Friday shortens the contract by one day and moves expiration to Thursday's close.
Weeklies are not listed when the regular front month is already in its final week, because the two contracts would then differ mainly by open interest.
The six inputs that assemble premium
Option premium is assembled from six inputs: underlying price, strike, time to expiration, dividends, interest rates, and implied volatility.
Underlying price and strike set intrinsic versus extrinsic value. Remaining time governs how much extrinsic value can exist. Implied volatility is the least stable input because it can reprice sharply when sentiment or fear shifts.
Interest rates and dividends are the least material inputs on short-dated contracts and become more relevant only on longer-term or multi-cycle tenors. All else equal, call premiums rise when interest rates rise because a long call has positive rho. A directionally hedged, risk-neutral long call is offset by short stock, so higher rates increase the interest earned on that short inventory.
Compressed theta, gamma, and implied volatility
Because the tenor is so short, theta and gamma exposure on weeklies is heightened in the same way those greeks intensify on any contract near expiration. Theta is the sensitivity of option premium to the passage of calendar time. Gamma is the sensitivity of delta to a move in the underlying price.
Extrinsic value is the portion of premium above intrinsic value, driven mainly by remaining time and implied volatility. Implied volatility is the volatility input implied by traded premium, reflecting a collective view of current and expected underlying movement. On this short tenor it remains the least stable input, because it can reprice sharply when sentiment or fear shifts.
All readings on this track · 23 readings
- 1994Selecting option expiration and strike by expected value
- 1994Evaluating DJIA weakness inside the quarterly futures cycle
- 1995Evaluating option-expiration weeks as index regimes
- 2004Index option execution through expiration and volatility context
- 2005Constructing credit spreads around settlement and implied volatility
- 2006Call credit spread execution, leftover premium and expiration decay
- 2006Expiration-aware call construction and automatic exercise
- 2007Expiration, leftover premium, and seasonal context for option construction
- 2007Seven option mistakes in premium, expiration, and implied volatility
- 2008Long straddle construction around implied volatility and expiration
- 2008Option income critiqued through volatility and expiration
- 2011Covered call writing as income holding or buy-write turnover
- 2011A five-day Treasury bond option sale as a market-regime choice
- 2011Session-access gaps, expiration exercise, and spread coverage
- 2011Weekly option tenor construction and premium drivers
- 2012PM-settled index expiration in a defensive sector regime
- 2014Weekly covered-call income and the expiration hold test
- 2016Weekday option expirations as a catalyst-timing overlay
- 2017Overlapping condors and expiration windows
- 2017Small-cap index futures listing change as a margin and options checkpoint
- 2017Pin risk as an expiration-day execution problem
- 2019Stock, index, and futures options as a capital and expiration filter
- 2020Dividend early assignment risk for short calls