Would the Adobe + Figma merge failure count?
https://www.reuters.com/technology/adobe-figma-terminate-20-...
> On December 18, 2023, Figma and Adobe both announced they were mutually agreeing to abandon their merger,[17][18] with Adobe citing that there was "no clear path to receive necessary regulatory approvals from the European Commission and the UK Competition and Markets Authority."
https://en.wikipedia.org/wiki/Figma#Attempted_acquisition_by...
Only if you count UK/EU regulators.