Polymarket has appointed former Goldman Sachs partner Lisa Mantil to lead its institutional growth effort, seeking to attract banks, fund managers, corporations and other large Wall Street participants to prediction markets. Mantil spent nearly 27 years at Goldman Sachs, where she became a partner and ran the ETF Accelerator, which helped clients launch exchange-traded funds. She is joining Polymarket as only the second employer of her career after being introduced to CEO Shayne Coplan by Goldman CEO David Solomon. Her mandate includes developing products that allow institutions to price and hedge elections, interest rates and geopolitical events. The company is also nearing the ability to offer privately negotiated block trades on its U.S. exchange, according to broker discussions reported by CNBC. Kalshi completed the sector's first block trade in April, followed by Polymarket's international site a month later. Institutional adoption remains constrained by disputes over regulators' authority over sports contracts, while Kalshi accounted for 83% of weekly volume in mid-September, according to BeInCrypto. The appointment comes as Polymarket faces scrutiny from the Commodity Futures Trading Commission, Congress and New York officials, including Attorney General Letitia James, who sued Polymarket US on Sept. 24 over alleged illegal gambling. Polymarket launched its U.S.-regulated exchange in May, is valued at approximately $21 billion after raising $1 billion from investors including 1789 Capital and Intercontinental Exchange, and has said it referred dozens of flagged accounts to the Department of Justice.