8-K Filing Explained: Items, Deadlines and Trading Gaps

An 8-K is the SEC's "current report": the filing a US public company must submit when a material event occurs, generally within four business days. Earnings, executive exits, big contracts, acquisitions, bankruptcies and delistings all arrive through it. Each 8-K carries an item number that tells you the type of news before you read a word.

This guide covers what an 8-K is, the items that matter, which ones move price, and how to manage the gap risk they create. It is educational only, not financial advice.

Key takeaways

• A company generally has four business days after a triggering event to file an 8-K, and many 8-Ks arrive the same day as a press release.
• The item number classifies the news: 2.02 is earnings, 5.02 is a director or officer change, 1.03 is bankruptcy, 3.01 is a listing problem.
• Most 8-Ks are routine and do nothing to the stock; the market-moving ones combine surprise with severity.
• A stop-loss does not protect you from a gap: if a stock opens below your stop, you exit at the open price, not your stop price.
• Trading the reaction to an 8-K (does the gap hold or fade?) is usually more reliable than guessing the headline.

What is an 8-K filing?

An 8-K is a report that a company files with the SEC to disclose a specific event between its scheduled reports. The 10-K (annual) and 10-Q (quarterly) are periodic summaries; the 8-K is event-driven. It is the official, filed record of a catalyst, and you can read it for free on the SEC's EDGAR database.

The press release often reaches the newswire first. The 8-K is the complete, legally filed version, usually with the release attached as an exhibit (Item 9.01, "Financial Statements and Exhibits").

What is the 8-K deadline?

The general rule is four business days from the event. Some situations are faster in practice: earnings are typically filed the same day as the release, and a few items (such as a Regulation FD disclosure) are timed to match when information goes public. A company can also file earlier than required, so an 8-K appearing within minutes of a headline is common.

Which 8-K item numbers matter most?

An 8-K is organized into numbered items, each a category of event. These are the ones traders see most often:

A few others are worth recognizing. Item 2.01 reports a completed acquisition or disposition. Item 4.01 is a change in the auditor. Item 4.02 says previously issued financial statements should no longer be relied on, which is a serious flag. Item 1.05 covers material cybersecurity incidents. Item 9.01 simply attaches exhibits.

One technical detail: Items 2.02 and 7.01 are usually furnished rather than "filed," which affects the company's legal liability for the text, not how you read it.

Which 8-Ks actually move the stock?

An 8-K moves price when it is both surprising and significant. A scheduled dividend or a minor amendment usually changes nothing; a CFO resigning without notice can.

• Earnings (2.02). The post-report gap is the classic example. Guidance often matters more than the quarter just reported, because the market prices what comes next. The same names often gap on a beat and still fall if the outlook disappoints.
• Executive changes (5.02). An unexpected CEO or CFO departure, especially with no named successor or a vague reason, is frequently read as a warning. A planned retirement with a successor named is usually quiet.
• Deals (1.01 and 2.01). A takeover target typically trades toward the offer price, while an acquirer can fall if the market thinks it overpaid or will issue many new shares.
• Distress (1.03, 3.01, 4.02). Bankruptcy, delisting notices and non-reliance on financials are sharply negative, and the reaction can be extreme.
• Reg FD (7.01). Investor-day decks or guidance updates move price only if they change expectations.

A practical triage: read the item number, scan the first paragraph, then ask "did this change what the business is likely to earn or whether it survives?" If not, it is noise.

How do you read an 8-K quickly?

Read an 8-K in four passes, which takes under two minutes once you are used to it.

1. Item number. It sets the category and tells you how seriously to take the rest.
2. First paragraph. Companies must state the event plainly here, before any spin.
3. Numbers and dates. For deals, look for price, share count and expected closing date. For officer changes, look for effective date and whether a successor is named. For agreements, look for dollar value relative to annual revenue.
4. Exhibits. The attached press release or contract holds the detail, including guidance and any dilution terms.

Also check the filing time. An 8-K filed after the close or before the open reaches the market while the regular session is shut, which is exactly how overnight gaps form. A filing during the session can halt the stock briefly if the news is large.

How do you trade around an 8-K?

Treat an 8-K as event risk: the price can jump past any level before you can act. A good approach has five parts.

1. Know the calendar. Earnings dates are scheduled. You can choose to be flat before them rather than hold a chart setup into a coin flip. The earnings holding framework walks through that decision.
2. Size for the gap, not the stop. If a stock can plausibly gap 15% against you, a stop 4% away tells you nothing about your real loss. Size the position so a gap through the stop is survivable.
3. Let the first minutes pass. Immediately after a filing, liquidity is thin and spreads are wide. Many traders wait for the first hour, or the first daily close, to see where the new range forms.
4. Trade the reaction. A stock that gaps up on good news and holds the gap is showing real demand. One that gaps up and sells off through the open is showing sellers using the news to exit. The gap-and-go setup and the gap fill strategy cover both outcomes.
5. Re-read the chart afterward. An 8-K can invalidate a pattern or launch a new one. The old stop and target may no longer make sense.

Worked example (hypothetical numbers)

A stock closes at $50 in a tight consolidation, and you hold 200 shares with a $48 stop (risking $2 a share, or $400). After the close it files an 8-K under Item 5.02: the CFO has resigned effective immediately, no successor named. The stock opens at $44.

Your stop at $48 becomes a market order at the open, filling near $44. The loss is $6 a share, or $1,200, three times the planned $400. If you had sized the position assuming a possible 12% gap, you would have held about 67 shares, and the same gap would have cost roughly $400. The stop did not fail; the sizing assumption did.

To find these filings quickly, see how to use SEC EDGAR; for the wider family of forms, read SEC filings explained.

Common mistakes with 8-K filings

• Treating every 8-K as news. Most are administrative. Learn the item numbers so you can skip the noise.
• Chasing the first print. The opening seconds are the least reliable prices of the day.
• Holding a breakout through earnings and calling it a pattern trade. The chart setup says nothing about the results.
• Ignoring the exhibit. The headline can say "record revenue" while the guidance in the exhibit is cut.
• Assuming a good headline means a rising stock. Price reflects expectations, not the news alone.

Patterns fail, event reactions are unpredictable, and past behavior around filings does not guarantee future results. Manage risk on every position and do your own research.

The bottom line

The 8-K is the market's "something just happened" filing. It is event-driven, generally due within four business days, and classified by item number. Earnings (2.02), officer changes (5.02), material agreements (1.01) and deals (2.01) move stocks; routine items rarely do. Respect the gap: know the calendar, size for the gap rather than the stop, and judge the reaction before the headline.

StockSetups scans the full US universe after each close and sorts patterns into long-only lanes (Setting up, Breaking out, Broke out, Retesting breakout). When an 8-K reshapes a chart, the next scan shows whether the stock broke out, failed or reset, so you can judge the post-event setup on its merits.