FlinchLab · run dated 2026-08-14

The market's reaction to every kind of SEC 8-K news, measured properly.

Name: Historical SEC 8-K Market-Reaction Dataset — by FlinchLab
Creator: Mustafa
License: One licence at one price: $99 one-time, covering commercial use as well as academic and personal research

Public companies are required to disclose material news through SEC 8-K filings. The official item codes are coarse: a single code averages together news types that move a stock in opposite directions. This is a research dataset that reads what the filings actually say, sorts them into finer categories, and measures each category's historical price reaction — with every reported finding tested on data it was not discovered in.

Built from 29,331 filings, run dated 2026-08-14. The pages below answer one question each, with the figures and the honest caveats.

Earnings releases (SEC item 2.02)

What happens to a stock when a company lowers its guidance?	-5.17%
What happens to a stock when a company raises its guidance?	+2.50%
Does the SEC's earnings filing code tell you anything about how a stock will react?	-0.15%
How much does a stock typically move on the day a company reports earnings?	+6.10%
What happens to a stock when an earnings release describes results as weak?	-1.90%
What happens to a stock when an earnings release describes results as strong?	+0.72%
What happens to a stock when an earnings release reports mixed results?	-1.05%
What happens to a stock when an earnings release does not mention guidance at all?	-0.35%
Do small companies get punished harder than large ones for cutting guidance?	-5.61%
Do small companies get a bigger boost than large ones for raising guidance?	+3.42%
Do small companies react more sharply to mixed earnings results?	-2.48%
Does it matter what time of day a company files bad guidance news?	-6.10%
Does the pop from raised guidance hold up over the following weeks?	-0.66%
Does a stock give back its gains after a strong earnings report?	-0.52%

All SEC 8-K filings

Does a stock start moving before the company files the news?

+0.02%

Executive and board changes (SEC item 5.02)

Do stocks fall when a company files an executive or board change?	-0.35%
Are executive-change filings worse news at small companies?	-0.44%
Does it matter how long a company waits to file an executive change?	-0.37%
What happens to a stock when a CEO departure is announced with a named successor?	-1.55%
What happens to a stock when an executive departs with no successor named?	-0.52%

Get the data

This page carries a single finding. The complete historical layer is a non-recurring, dated, versioned file. It holds every validated finding with the out-of-sample holdout columns, classification below the raw filing categories, the full aggregate grid, the data dictionary and the methodology.

Download the free sample — eight rows, all twenty columns, no email address needed. Then decide.

Buy the dataset — $99 one-time

Checkout runs on Polar and the download starts as soon as it completes. One licence at one price: $99 one-time, covering commercial use as well as academic and personal research — the full terms are in the file as LICENSE.md.

One-time file: $99 one-time
Licence: One licence at one price: $99 one-time, covering commercial use as well as academic and personal research
Ask a question: data@flinchlab.com
Full details: What is in the file

A forward-looking version — the same classification applied to filings as they arrive — does not exist yet and has no date. If that is the one you would actually use, say so here. What people ask for is how the order of work gets decided.

What this is not

This is not investment advice, not a forecast, and not a trading signal. It does not say what any stock will do next, and it is not a recommendation to buy or sell. No public page contains company-level data. The figures are historical averages across many filings.