Stax has raised a total of $264 million across four funding rounds, achieving unicorn status with a $1 billion valuation in March 2022. Its latest Series D round of $245 million in March 2021 was led by Greater Sum Ventures and HarbourVest Partners, following earlier rounds from Panoramic Ventures, Grotech Ventures, and Harbor View Advisors. Founded in 2014 and headquartered in Orlando, Florida, Stax offers all-in-one payment processing solutions that help businesses manage billing, invoicing, and payments seamlessly while expanding globally through innovation and automation.