"Form 8-K is a mandatory current report filed by U.S. publicly traded companies with the Securities and Exchange Commission (SEC) to disclose significant, unscheduled corporate events. Companies generally have four business days from the occurrence of a material event to file this form, ensuring investors receive timely updates between annual (10-K) and quarterly (10-Q) reports. "
It was filed yesterday:
https://www.sec.gov/Archives/edgar/data/51143/000005114326000077/ibm-20260722.htm
https://www.ibm.com/investor/financial-reporting
Not sure if this means more bad news is coming or if this was them filing something about the 2Q Earnings that took 25% of the stock. Examples I was given of things that a 8-K is for is a C-suite quitting or being removed, bankruptcy, or the loss of a significant large contract.