Robinhood (NASDAQ:HOOD) CEO Vlad Tenev is stepping beyond trading apps with a new venture: Harmonic AI, a startup aiming to create what it calls “mathematical superintelligence.” The company last month announced the closing of a $100 million Series B funding round, bringing its valuation to $875 million. Tenev co-founded Palo Alto-based Harmonic in 2023 alongside CEO Tudor Achim, a former executive at autonomous driving company Helm.ai. Though he is not running the company day to day, Tenev serv