Strike Selection Mistakes to Avoid for Earnings Season
Navigating earnings season is one of the most challenging periods for any trader. The surge in implied volatility (IV), the potential for massive price gaps, and the binary nature of the event create a high-stakes environment where a single error in strike selection can lead to significant losses, even if you get the direction of the move correct. Choosing the right options strike price is not just about where you think the stock is going; it is about balancing the cost of the option, the probability of profit, and the mathematical reality of the post-earnings volatility crush.
In this comprehensive guide, we will explore the critical mistakes traders make when selecting strikes for earnings, how to use advanced analysis to mitigate these risks, and how to structure trades that survive the unique dynamics of event-driven volatility.
1. Ignoring the Implied Move and Expected Range
One of the most frequent mistakes traders make is selecting a strike price that is far outside the market's expected move. The implied move is the amount the market expects a stock to fluctuate by the expiration date, calculated primarily from the price of the At-The-Money (ATM) straddle.
The Math of the Implied Move
Before you open a trade, you must calculate the implied move. A common shorthand is to take the price of the closest expiration straddle and multiply it by 0.85, or simply look at the total cost of the straddle. If a $100 stock has a straddle priced at $10, the market is pricing in a 10% move. If you buy a $120 call, you are betting on a move that is double what the market currently expects.
While "moonshot" trades can pay off, they have a low mathematical probability. By ignoring the IV context, traders often buy Out-of-the-Money (OTM) strikes that remain OTM even after a positive earnings surprise. This is known as being "right but wrong"—the stock goes up, but not enough to offset the rapid decay of the option's premium. According to the CBOE, understanding the relationship between premium and expected movement is foundational to professional risk management.
2. Falling Victim to the Volatility Crush
Earnings announcements are known as "volatility events." Leading up to the announcement, uncertainty increases, causing IV to skyrocket. This inflates the price of all options, regardless of their strike. The moment the news is released, the uncertainty vanishes, and IV collapses. This is the volatility crush.
The Impact on Strike Selection
Traders who buy OTM options often fail to realize that the Vega (sensitivity to volatility) can outweigh the Delta (sensitivity to price). If you select a strike that is too far OTM, the gain you get from the stock moving toward your strike may be completely wiped out by the drop in IV.
To avoid this, sophisticated traders often use the options screener to identify spreads rather than naked long options. By selling a further OTM option against their long position (a vertical spread), they can offset some of the IV crush, as the option they sold will also lose value rapidly, benefiting the overall position.
3. Overlooking Gamma Risk in Front-Month Expirations
Many traders choose the expiration date closest to the earnings event to maximize leverage. However, this exposes the trade to extreme Gamma risk. Gamma represents the rate of change in an option's Delta. For options near expiration, Gamma is at its peak.
A small move in the underlying stock can cause the Delta of an ATM option to swing from 0.50 to 1.00 or down to 0.00 very quickly. If you select a strike that is too close to the current price in a weekly expiration, you are essentially gambling on a razor-thin margin of error.
Instead of focusing solely on the nearest expiry, consider using performance tracking to see how different durations have historically handled the post-earnings move. Sometimes, buying an option with two or three weeks of remaining life provides a "buffer" against the immediate decay that occurs in weekly contracts.
4. Misunderstanding Liquidity and Bid-Ask Spreads
During earnings, liquidity can dry up in the OTM strikes, leading to massive bid-ask spreads. A common mistake is selecting a strike price based on the "mid-price" without realizing that the actual execution price will be much worse.
Execution Pitfalls
If you are trading a stock like Chipotle (CMG) or an illiquid small-cap, the spread on an OTM call might be $1.00 wide. If you buy at the ask and try to sell after earnings, you might already be down 10-20% just on the spread alone.
Before committing to a strike, check the options chain for open interest and volume. High open interest usually correlates with tighter spreads. If you see a strike with zero open interest, avoid it, as getting out of the position after the news hits may be nearly impossible at a fair price. The SEC emphasizes that liquidity risk is a primary concern for retail investors in derivative markets.
5. Failing to Use Delta as a Probability Proxy
Traders often select strikes based on a "feeling" that a stock will hit a certain price. A more scientific approach is to use Delta as a proxy for the probability of the option finishing In-The-Money (ITM).
- 25 Delta Call: Roughly a 25% chance of being ITM at expiration.
- 50 Delta Call (ATM): Roughly a 50% chance of being ITM at expiration.
Selecting a 10 Delta strike for an earnings play means you have a 90% theoretical chance of the option expiring worthless. While the payout is higher, the trade selection should be rooted in a realistic assessment of probability. If you are looking for a high-probability trade, you might consider selling a credit spread at a 15-20 Delta level, effectively betting that the stock won't move beyond a certain point. This allows you to profit from the IV crush rather than being a victim of it.
6. Neglecting GEX and Technical Levels
Strike selection should never happen in a vacuum. The broader market structure, specifically Gamma Exposure (GEX), plays a massive role in how a stock reacts to earnings. Large clusters of open interest at specific strikes often act as magnets or barriers.
Using tools like GEX levels, traders can see where market makers are most exposed. If there is a massive amount of call open interest at $150, that level may act as a ceiling for the post-earnings rally because market makers will be selling shares to hedge their positions as the stock approaches that strike. Choosing a strike at $155 in this scenario is a mistake, as the stock is likely to stall at $150.
7. The "Lottery Ticket" Mentality with Deep OTM Strikes
Perhaps the most common mistake is the "Lottery Ticket" approach—buying deep OTM options because they are cheap. A $0.10 option looks attractive because you can buy 100 contracts for $1,000. However, during earnings, these options are cheap for a reason.
For a deep OTM option to become profitable, the stock doesn't just need to beat earnings; it needs to have a "black swan" style move. According to Investopedia, most OTM options expire worthless. During earnings, the "hurdle rate" (the amount the stock must move to break even) is much higher due to the premium inflation.
Instead of buying 100 deep OTM contracts, a more professional approach is to buy 10 ATM contracts. The ATM contracts have a much higher Delta and will capture the move immediately, whereas the OTM contracts require a massive move just to start gaining value. You can model these outcomes using a PnL model to visualize how different strikes perform under various price targets.
8. Ignoring the Skew
Volatility Skew refers to the difference in IV between different strike prices. In many stocks, OTM puts have a higher IV than OTM calls because investors buy puts for protection (downside fear).
If you are bullish on a stock but the OTM calls are significantly more expensive than the OTM puts (or vice versa), you are paying a "skew premium." A mistake in strike selection is buying the side of the skew that is overpriced. Instead, you could use a Risk Reversal strategy—selling the expensive side to fund the purchase of the cheaper side. Analyzing the flow of institutional orders can help you identify which way the "smart money" is leaning regarding skew and strike preference.
9. Forgetting the Post-Earnings Drift
Many traders select strikes based only on the immediate reaction (the "gap"). However, many stocks exhibit a Post-Earnings Announcement Drift (PEAD), where the stock continues to move in the direction of the surprise for days or weeks.
If you select a strike that expires the day after earnings, you miss out on the potential drift. By selecting a strike with more time (30-60 days out), you reduce the impact of the immediate IV crush and give the stock time to reach your target price through the drift phase. You can research these trends on FINRA to understand the long-term risks associated with short-term speculative trading.
10. Lack of a Defined Exit Plan for the Selected Strike
Finally, the biggest mistake isn't just picking the wrong strike—it's not knowing when to exit it. If you buy an ATM strike and the stock gaps up 5%, your option might be up 50% in the first five minutes of trading. Many traders wait for "more," only to see the IV crush and mean reversion eat away their profits by noon.
Before the trade, use a PnL model to determine exactly what the option will be worth at your target price, accounting for a 20-30% drop in IV. If the math shows the profit is sufficient, set a limit order. Strike selection is only half the battle; execution is the other half.
Summary of Best Practices for Earnings Strike Selection
To summarize, avoid these pitfalls by following a disciplined process:
- Calculate the Implied Move: Never pick a strike without knowing what the market expects.
- Use Spreads to Mitigate IV Crush: Sell high IV to buy high IV.
- Check Liquidity: Ensure the bid-ask spread won't kill your trade on day one.
- Prioritize Delta over Price: Buy strikes with a higher probability of being ITM.
- Watch the GEX: Align your strikes with market structure and institutional levels.
By avoiding these common mistakes, you can transition from gambling on earnings to trading them with a mathematical edge. Use the tools available to verify your assumptions and always respect the power of the volatility crush.
Frequently Asked Questions
What is the best strike price to buy for earnings?
There is no single "best" strike, but generally, At-The-Money (ATM) or slightly In-The-Money (ITM) strikes are preferred for long positions because they have higher Delta and are less affected by the volatility crush than deep Out-of-the-Money (OTM) strikes. If you want to reduce cost, consider a vertical spread rather than buying a cheaper, further OTM strike.
How does IV crush affect my strike selection?
IV crush reduces the extrinsic value of all options after earnings are announced. OTM options consist entirely of extrinsic value, meaning they are the hardest hit; if the stock doesn't move past the strike price, the option can lose 50-90% of its value instantly. Selecting strikes closer to the money or using spreads helps mitigate this risk.
Should I buy weekly or monthly options for earnings?
Weekly options offer higher leverage but carry extreme Gamma risk and time decay (Theta). Monthly options (or those with at least 30 days to expiration) are generally safer for earnings because they have lower Gamma and are less sensitive to the immediate post-earnings volatility collapse, allowing more time for the stock to move.
How do I calculate the "implied move" for a stock?
A quick way to calculate the implied move is to add the price of the At-The-Money Call and Put (the straddle) for the expiration immediately following the earnings announcement. This total dollar amount represents the move the market is pricing in; choosing a strike outside this range is a bet on an outlier event.
Is it better to buy or sell options during earnings season?
Selling options (or credit spreads) allows you to profit from the volatility crush, which is a high-probability strategy. However, buying options offers capped risk and unlimited potential. Most professional traders prefer selling premium through iron condors or credit spreads when IV is historically high, provided they are comfortable with the directional risk.