My stock dropped. Which disclosure explains it?

Results: Form 8-K Item 2.02, then the 10-Q or 10-K

Item 2.02, Results of Operations and Financial Condition, is where a company furnishes its earnings release, usually as an exhibit. The full report follows on a 10-Q for a quarter or a 10-K for the year, with the statements, the notes and management's discussion. Apple's fiscal 2025 10-K, for example, came the day after its results 8-K.

A priced offering: the 424B prospectus supplement

A 424B5 records a takedown from an effective shelf: what was sold, shares or notes, how much and at what price. Marketed deals and IPOs usually file their final prospectus as a 424B4. For an at-the-market program the 424B5 sets up the program, and the shares actually sold show up later in the share count of the next 10-Q or 10-K.

Capacity, not a sale yet: the S-3 or S-1 registration

A registration statement registers shares the company may sell. A shelf on Form S-3 can sit unused for years, and many are never fully used; the dilution happens at the takedown, when a 424B prices actual shares.

A private sale: Form 8-K Items 1.01 and 3.02

Item 1.01 reports entry into a material definitive agreement, such as a securities purchase agreement. Item 3.02 reports unregistered sales of equity securities once they pass the item's volume threshold, and the SEC staff reads that threshold through to the shares that warrants or convertible notes can turn into.

Insider sales: Form 4

Officers, directors and holders of more than 10% of a class of registered equity report changes in their holdings on Form 4. The transaction code says what happened, S marking a sale, and a checkbox says whether the trade ran under a Rule 10b5-1 plan adopted in advance. An insider sale moves existing shares to a new owner; it adds none to the count.

A news halt: the announcement, then usually a Form 8-K

A news-pending halt pauses trading so material news can spread before trading resumes. The news itself is a press release, and when it is a reportable event the company files a Form 8-K under the matching item number. The item number tells you the category before you read a word.

A volatility pause: the price move itself

A Limit Up-Limit Down pause fires automatically when the price reaches a band around its recent reference price. The move triggers it, not a disclosure, so if a filing explains the drop it is a separate document with its own date.

An SEC trading suspension: the SEC's own order

A trading suspension is an action by the SEC, not a filing by the company, and the SEC publishes each suspension as a release on its website. The federal securities laws let the SEC suspend trading in any stock for up to 10 trading days when it decides that is required in the public interest and for the protection of investors.

A listing notice: Form 8-K Item 3.01

Item 3.01 is titled Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. It is the item a company uses to report that its exchange has flagged the stock against a listing standard, or that the listing is moving.

A reverse split: a new share count at a fixed ratio

A reverse split combines shares at a fixed ratio, so the share count falls and the price per share rises by the same multiple; nothing about the business changes on the day. Read the announcement in the company's own filings for the ratio and the effective date, and if you hold options, read how the contracts were adjusted.

A departure or appointment: Form 8-K Item 5.02

Item 5.02 covers the departure of directors or certain officers, the election of directors, the appointment of certain officers and their compensatory arrangements. One item covers all four, so the filing's own text says which of them happened.

A new auditor: Form 8-K Item 4.01

Item 4.01 is titled Changes in Registrant's Certifying Accountant. The SEC staff says an Item 4.01 event must always be reported on its own Form 8-K, even when it falls within four business days of a 10-Q or 10-K that could otherwise carry it.

Past numbers withdrawn: Form 8-K Item 4.02

Item 4.02 is titled Non-Reliance on Previously Issued Financial Statements or a Related Audit Report or Completed Interim Review. It is the item a company uses to say figures it already published should no longer be relied on, and like Item 4.01 the SEC staff says it must always be reported on its own Form 8-K.

Nothing company-specific on file

Our why-is-it-moving page checks one ticker's latest session for recent 8-Ks, a halt and fresh headlines, and says so when nothing company-specific is on file. When nothing is, the cause may sit outside the company: compare the move with its industry and with the whole market for the same session.