answers: four business days
context: Form 8-K Form 8-K is a very broad form used to notify investors in United States public companies of specified events that may be important to shareholders or the United States Securities and Exchange Commission. This is one of the most common types of forms filed with the SEC. After a significant event like bankruptcy or departure of a CEO, a public company generally must file a Current Report on Form 8-K within four business days to provide an update to previously filed quarterly reports on Form 10-Q and/or Annual Reports on Form 10-K. Form 8-K is required to be </s> (CFR) designation of the form pursuant to sections 13 and 15(d) of the Securities Exchange Act of 1934 as amended. Unlike the 10-K filed annually, other forms serve related purposes, but have different schedules. Form 10-Q, much briefer, is filed after each of the three quarters that do not have a 10-K filing. Form 8-K covers special material events that occur between 10-K and 10-Q filings. A substantial number of firms filed their 10-K as a Form 10-K405 during the late 1990s and early 2000s (decade). A 10-K405 is a 10-K where the Regulation S-K Item 405 box on the </s> filed by public companies with the SEC pursuant to the Securities Exchange Act of 1934, as amended. Form 8-K is used to notify investors of a current event. These types of events include signing, amending or terminating material definitive agreements not made in the ordinary course of business, bankruptcies or receiverships, mine shutdowns or violations of mine health and safety laws, consummation of a material asset acquisition or sale, results of operations and financial condition, creating certain financial obligations, such as incurrence of material debt, triggering events that accelerate material obligations (such as defaults on a loan), costs associated with
question: when must form 8-k be filed with the sec