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Buying a stock shortly before earnings means accepting the possibility that the next available price will be far above or below its prior close. A report can change how investors value a company while regular trading is closed; market and stop orders do not insure you against that gap. The practical choices are to wait until the report is public or, if you buy beforehand, limit the exposure to an amount you can tolerate losing.
Why earnings create a distinct risk
An earnings announcement can deliver new information about a company, prompting investors to revise its value. If the release comes after the market closes or before it opens, the next regular-session price may reflect that news all at once. The stock can open higher or lower than the previous close, and the direction and size of the move vary by company and announcement.
There is no generally applicable probability or average percentage move established for an individual stock’s earnings gap. Research provides context, not a dependable forecast: a 2024 study of Tokyo Stock Exchange data linked after-hours bad-news releases for less actively traded stocks with informed trading, return reversals and price adjustment before the open. Those findings are specific to that market and study; they are not a rule for every stock or a U.S.-specific prediction (Xiao and Yamamoto, 2024).
Historical research also illustrates why timing can complicate execution. Patell and Wolfson’s 1984 study found that returns from simple trading rules dissipated within five to ten minutes, while significant returns were detected overnight and at the next day’s open. That result describes the study’s historical sample, not how quickly every stock reacts today (Patell and Wolfson, 1984).
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Should you buy a stock before earnings?
Start by separating the investment decision from the event bet. Ask whether the stock would still fit your plan if the report disappointed and the price opened lower. If the main reason to buy now is a belief that the upcoming report will beat expectations, recognize that you are taking a view on an uncertain event, not just buying into the company’s longer-term prospects.
Check the actual release timing
Look up the company’s earnings date and, when available, release time on its official investor-relations page. Confirm whether the announcement is expected before the open, after the close or during market hours, and whether your intended holding period crosses an overnight or after-hours interval. Dates can change, so verify them close to the decision rather than relying on a calendar copied elsewhere.
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Consider waiting for the information
Waiting until the announcement is public avoids carrying the same pre-release exposure. It does not guarantee a better entry: the stock may move sharply before you can trade, and buying afterward still carries ordinary investment risk. It is a trade-off between entering earlier and avoiding exposure to the announcement itself.
Size the position for a disappointing outcome
If you decide to buy before the release, choose a position size with a plausible adverse move in mind. Consider how much you could afford to lose without disrupting essential savings or other financial commitments. There is no universally correct percentage or formula, and smaller sizing cannot make a gap harmless or impossible.
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What order types can—and cannot—do
Order instructions govern how a trade may be executed; they do not protect the investment thesis or guarantee an exit at a chosen price. The SEC explains that a market order prioritizes execution but does not guarantee the execution price. A buy limit order sets the highest price you are willing to pay, but “A limit order is not guaranteed to execute” (SEC Investor.gov, Understanding Order Types).
| Order type | What it controls | Key earnings-period limitation |
|---|---|---|
| Market | Prioritizes execution at the best available price when the order reaches the market. | The execution price is not guaranteed; a fast move or thin trading can produce an unexpected fill. |
| Limit | Sets a maximum acceptable price for a buy order or minimum acceptable price for a sell order. | The order may not execute if the market does not reach the limit. |
| Stop | Uses a stop price as a trigger; once triggered, the order becomes a market order. | The eventual execution price can differ from the stop price, especially after a gap. |
| Stop-limit | Uses a stop price to trigger a limit order, which constrains the acceptable execution price. | The order can remain unfilled if the market moves past the limit. Neither stop type assures protection when prices move across the trigger or limit while the market is closed. |
Brokerages can differ in the order types they offer and the rules used to trigger them. Check your firm’s order details before placing a trade, particularly for extended-hours orders. A stop price is a trigger, not a promise that you can sell at that price.
Why options are not a simple hedge
Options add their own risks and are not a universal fix for earnings uncertainty. SEC guidance warns that an options buyer can lose the entire premium, and some option writers can face unlimited losses. Near expiration, volatility can also contribute to an option expiring worthless. Understand the contract, possible loss and expiration mechanics before considering options; do not assume a particular strategy is suitable simply because earnings are approaching (SEC Investor.gov, An Introduction to Options).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical decision sequence
- Verify the date and time: Use the issuer’s investor-relations information and establish whether you would hold the stock through the release and any non-trading interval.
- Test the reason for buying: Decide whether the stock still makes sense to you if earnings disappoint and the price opens lower.
- Choose whether to wait: Compare the benefit of entering now with the risk of holding through an information event. Waiting changes the timing of exposure, not the possibility of a poor investment outcome later.
- If buying early, set an exposure limit: Base the position size on a loss you can tolerate, not on confidence that the report will move the stock your way.
- Choose an order for its actual function: Use a market order when execution priority matters, or a limit order when price control matters more than certainty of execution. Treat stops as triggers, not guaranteed exits, and check your broker’s rules.
Evidence about earnings patterns should not be mistaken for a reliable prediction. For example, a 2025 study reported an 85-basis-point average risk-adjusted return difference over the 10-day window before current earnings announcements between portfolios sorted by the maximum return at prior earnings announcements. That is a sample-specific portfolio association, not a typical gap, a forecast for an individual stock or proof that buying before earnings is a dependable strategy (Nguyen, 2025). Another study found differences in uncertainty and volatility risk premiums by reporting timing for certain firms, concentrated among high-growth firms; it does not establish a dependable way to profit from an announcement (Neururer, 2020).
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