The 401(k) for small and medium-sized businesses. Human Interest is a Y Combinator-backed company that offers an easy and affordable 401(k) retirement plan for the modern workforce. We’ve raised $500M and are backed by leading investors. Most recently, by funding from BlackRock as well as many other top investors: TPG (The Rise Fund) with SoftBank led our Series D, Glynn Capital, NewView Capital, USVP, Wing, Uncork, and others.