Expiration Date
Key Takeaways
- The expiration date is the last day an option contract can be exercised
- Options lose value (time decay) as expiration approaches
- Standard monthly options expire on the third Friday of the month
- Weekly options and LEAPS provide shorter and longer expiration choices
Definition
The expiration date is the date on which an options contract ceases to exist. After this date, the holder can no longer exercise their right to buy (for calls) or sell (for puts) the underlying asset. If the option is in the money at expiration, it is typically automatically exercised. If out of the money, it expires worthless.
The expiration date is one of the most critical factors in options pricing. An option's time value — the portion of its premium attributable to time remaining — decays as expiration approaches, a phenomenon called theta decay. This decay accelerates in the final weeks and days before expiration.
Options are available with various expiration dates: weekly options (expiring every Friday), monthly options (expiring the third Friday of each month), quarterly options, and LEAPS (Long-Term Equity Anticipation Securities) with expirations up to two or more years in the future.
How It Works
Standard equity options expire on the third Friday of the expiration month. The last trading day is the expiration date itself, with exercise decisions finalized by 5:30 PM Eastern Time. Options that are in the money by $0.01 or more are automatically exercised by the Options Clearing Corporation (OCC) unless the holder provides contrary instructions.
Time value decays at an increasing rate as expiration approaches (theta decay follows a square root curve). An option with 60 days to expiration loses time value slowly, while the same option with 7 days to expiration loses value much faster each day. This is why buying short-dated options is particularly risky.
Traders choose expiration dates based on their expected timeframe for the underlying stock's move. A trader expecting a stock to rise over the next month might buy a 45-day option, giving extra time as a buffer. Options expiring in less than 30 days have the fastest time decay and are favored by options sellers who profit from decay.
Example
An investor buys a Microsoft (MSFT) call option with a $420 strike price for $10 per share ($1,000 per contract) with 45 days until expiration. After 30 days, Microsoft has risen to $425, and the call is worth $8 despite being $5 in the money. How? The option lost $7 in time value while gaining only $5 in intrinsic value. With 15 days remaining, time decay has eroded most of the premium. This illustrates why timing and expiration selection are critical — being right about direction but wrong about timing is a common way options traders lose money.
Why It Matters
Expiration date determines the time horizon of an options trade and profoundly affects risk and reward. Longer-dated options cost more but give the underlying asset more time to move favorably. Shorter-dated options are cheaper but face rapid time decay and require the expected move to happen quickly.
For options sellers, expiration is an ally — time decay generates profit as the sold option loses value. For options buyers, expiration is the enemy — every day that passes without a favorable move costs money. This fundamental dynamic is why approximately 60-70% of options expire worthless, favoring sellers over time.
Advantages
- Multiple expiration choices allow tailoring strategies to expected timeframes
- LEAPS provide long-term leveraged exposure with reduced time decay
- Weekly options enable precise positioning around events like earnings
- Expiration creates natural exit points for disciplined trading
Limitations
- Time decay accelerates near expiration, punishing option buyers
- Short-dated options are highly sensitive to timing accuracy
- Rolling options to later expirations incurs additional costs
- Expiration can force unfavorable exercise or assignment
Frequently Asked Questions
Related Terms
Browse more definitions in the financial terms glossary.