Naga Avan-Nomayo / The Block:Polymarket CEO Shayne Coplan says the startup raised two undisclosed rounds: $55M at a $350M valuation in 2024 and $150M at a $1.2B valuation earlier in 2025 — - Polymarket CEO Shayne Coplan says the prediction platform raised $55 million in 2024 and $150 million earlier this year.