30 Under 30, Cofounders Sam Aarons and Matt Marcus

For businesses that frequently move money in and out of bank accounts for their customers (like fintech and insurance companies), managing bank payments is time-consuming and manual. Modern Treasury automates those payments with software that connects directly to the banking system. It has 80 clients, including companies like Pipe and Masterworks, up from 20 a year ago. It's processing more than $2 billion in monthly payments and recently raised $85 million at a $2 billion valuation.