Hudson River Trading (HRT), a Wall Street market maker and quantitative trading firm, has begun trading on prediction market platform Kalshi. According to Odaily, citing people familiar with the matter, HRT started trading about a month ago through its futures team, focusing on Up-Down Markets contracts that settle based on short-term asset price movements. The firm has not entered sports or other non-financial event markets and also participated in Kalshi’s latest $1 billion funding round, which valued the company at $40 billion. HRT joins Jump Trading and Susquehanna International Group among trading firms active in prediction markets.