Former Goldman Sachs partner Lisa Mantil has departed the investment bank after 27 years to join decentralized prediction platform Polymarket as its head of institutional business development. Introduced to Polymarket Chief Executive Officer Shayne Coplan by Goldman Sachs CEO David Solomon, Mantil will focus on building tailored products for banks, fund managers, and corporate entities seeking to price and hedge exposure to interest rates, elections, and geopolitical events.
Building Institutional Products Amid Kalshi Rivalry
During her tenure at Goldman Sachs, Mantil ran the ETF Accelerator, helping institutional clients launch exchange-traded funds. Her transition to Polymarket comes as the prediction market ecosystem attempts to transition from retail sports wagering toward institutional-grade derivatives. To serve larger financial institutions, platforms are rushing to offer block trades—large private deals designed to execute without triggering severe price slippage.
Rival prediction exchange Kalshi completed its first block trade in April, while Polymarket's international venue introduced the feature a month later. According to broker reports, Polymarket is currently finalizing capabilities to launch block trading on its U.S. venue. The push for institutional capital follows market share pressure from Kalshi, which captured 83% of total weekly prediction market volume in mid-September.
Regulatory Friction and Legal Challenges in New York
Polymarket's institutional expansion coincides with intensifying state regulatory scrutiny. On September 24, New York Attorney General Letitia James filed a lawsuit against Polymarket US, alleging that the entity operates an illegal gambling business within the state. Regulatory ambiguity surrounding event contracts and state jurisdiction continues to cause institutional participants to hesitate before deploying capital into prediction markets as traders keep a close eye on broader regulatory and political risks.
Key Takeaways
- Lisa Mantil left her 27-year career as a Goldman Sachs partner to build Polymarket's institutional arm.
- Kalshi dominated the sector in mid-September, processing 83% of weekly trading volume.
- New York Attorney General Letitia James sued Polymarket US on September 24 over alleged unlicensed gambling.
Why It Matters
Mantil's hiring highlights how prediction platforms are prioritizing institutional credibility over retail volume in an effort to transform event-based contracts into mainstream financial hedging instruments. However, while high-profile Wall Street talent can accelerate product development, regulatory resistance—evidenced by New York's state lawsuit—remains the single largest barrier preventing institutional desks from deploying capital at scale.
