Interactive Brokers Group Inc. (NASDAQ: IBKR) and Robinhood Markets Inc. (NASDAQ: HOOD) have different strategies in the growing $63 billion prediction market industry. IBKR focuses on temperature contracts for utilities, not sports betting, with 286 million contract pairs traded in Q4, up from 15 million in Q3, and over 10,000 instruments listed. In contrast, Robinhood's sports contracts face regulatory issues, as a Massachusetts court deemed them illegal gambling, not regulated derivatives. IBKR aims to onboard institutional clients, while Robinhood's focus on sports faces regulatory challenges. Peterffy, IBKR's CEO, emphasized their avoidance of sports betting during their Q4 earnings call.