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What is an 8-K filing?

An 8-K is the disclosure form U.S. public companies use to tell investors about material events that happen between their quarterly 10-Q filings. They are typically filed within four business days of the event.

The short answer

The 8-K is the SEC's "current report" form. It exists because waiting until the next quarterly 10-Q to disclose major events would leave the market trading on stale information. Public companies are required to file an 8-K within four business days when one of about two dozen specific events occurs.

If you've ever seen a stock move sharply on news of an executive departure, an acquisition, an earnings preannouncement, or a credit downgrade, that move was almost always tied to an 8-K filing.

When an 8-K must be filed

The SEC defines specific *items* that trigger an 8-K. Each item corresponds to a section of the form. The most-watched ones:

  • Item 1.01 — Entry into a material definitive agreement (big new contract, partnership, financing)
  • Item 1.02 — Termination of a material definitive agreement
  • Item 2.01 — Completion of acquisition or disposition of assets (M&A close)
  • Item 2.02 — Results of operations and financial condition (earnings releases live here)
  • Item 2.03 — Material direct financial obligation (new debt, large credit facility)
  • Item 3.01 — Notice of delisting or failure to satisfy a listing rule
  • Item 4.01 — Changes in registrant's certifying accountant (auditor change)
  • Item 4.02 — Non-reliance on previously issued financial statements (restatement!)
  • Item 5.01 — Changes in control of registrant
  • Item 5.02 — Departure or appointment of directors or officers (the famous "5.02" filings)
  • Item 5.07 — Submission of matters to a vote of security holders
  • Item 7.01 — Regulation FD disclosure (catch-all for material info)
  • Item 8.01 — Other events (the catch-all for anything not covered above)
  • Item 9.01 — Financial statements and exhibits (where attachments live)

There are more items, but those above represent the bulk of market-moving 8-K filings.

What's in an 8-K

Structurally, every 8-K has:

  • Cover page — issuer name, CIK, state of incorporation, ticker, event date.
  • Item-numbered sections — each event gets its own item with narrative disclosure.
  • Exhibits — press releases, board resolutions, agreements, etc., usually attached as separate files.

The narrative portions are written in formal legal language. The press release exhibit (Exhibit 99.1 in most cases) is almost always the most useful version of the same content.

When 8-Ks are filed (timing)

Within four business days of the triggering event, with two important exceptions:

  • Earnings announcements (Item 2.02) — filed immediately upon release of the press release, often before market open or after close.
  • Regulation FD events (Item 7.01) — typically filed the same day as the disclosure.

There's no rule requiring 8-Ks be filed before market open, after close, or at any particular time of day. They land throughout the trading day, which is why real-time 8-K monitoring is so valuable.

Why traders care

Three primary reasons:

  1. Earnings. Item 2.02 8-Ks include the earnings press release. The first trader to read the headline numbers and act has an advantage measured in seconds.
  2. M&A. Item 1.01 and 2.01 are where merger announcements and definitive agreement signings appear. These move stocks tens of percent in seconds.
  3. Executive changes and restatements. Item 5.02 (CEO/CFO departures) and Item 4.02 (financial restatements) are often the first warning signs of corporate trouble.

Quant strategies built on 8-K data typically focus on event windows: hold from filing through some number of trading days and measure realized return versus expectation.

How to get 8-K data programmatically

Direct from EDGAR:

  • 8-Ks are filed at random times throughout the trading day, so polling has to be aggressive.
  • The SEC's full-text search API and daily filings index both exist, but the daily index is published once per day, far too late for event trading.
  • Real-time monitoring requires polling the EDGAR RSS feeds or the EFTS feed every few seconds.

EdgarKit polls EDGAR continuously and pushes new 8-Ks via webhook within ~30 seconds of acceptance:

curl "https://api.edgarkit.com/v1/filings?form_type=8-K&ticker=NVDA&limit=10" \
  -H "Authorization: Bearer YOUR_API_KEY"

Returns the most recent ten 8-Ks for Nvidia. Add a webhook to receive them in real time:

curl "https://api.edgarkit.com/v1/webhooks" \
  -X POST \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "https://your-server.com/edgar-events",
    "filters": { "form_types": ["8-K"], "tickers": ["NVDA"] }
  }'

Common mistakes when reading 8-Ks

  • Reading only the cover page. The interesting content is in the item-numbered sections and the exhibits.
  • Ignoring 7.01 (Reg FD). This is the catch-all for material information that doesn't fit cleanly elsewhere. Easy to under-weight.
  • Trading on the headline before reading the full release. Earnings 8-Ks often have non-GAAP adjustments that change the story.
  • Treating every 5.02 as bearish. Director retirements at end-of-term are routine. The signal is in *unscheduled* departures.

FAQ

How quickly does an 8-K have to be filed?

Within four business days of the triggering event, except for Item 2.02 (earnings) and Item 7.01 (Reg FD), which are typically filed immediately.

Which 8-K items move stocks the most?

Item 2.02 (earnings), Item 1.01/2.01 (material agreements and M&A), Item 5.02 (executive changes), and Item 4.02 (financial restatements). Item 7.01 catches a lot of one-off material disclosures.

Are press releases the same as 8-K filings?

No, but they're closely related. A press release is the corporate communication; the 8-K is the SEC filing that wraps it. Most public-company press releases of material events are filed as exhibits to an 8-K (typically Exhibit 99.1).

Is the 8-K filed publicly the moment the SEC receives it?

Yes. Once accepted by EDGAR, the filing is publicly available immediately. There's no delay or embargo.

What's the difference between an 8-K and a 10-Q?

The 8-K reports a specific material event in close to real time. A 10-Q is a quarterly report covering the company's full financial results for the period. 8-Ks happen as events warrant; 10-Qs happen on a fixed quarterly schedule.