Mizuho Securities USA LLC has downgraded Circle's stock rating from "Neutral" to "Underperform," with a new price target of $50, marking the lowest target on Wall Street. Analyst Dan Dolev cited a significant decline in Circle's stock price, which has dropped over 75% from its post-IPO peak last year. The downgrade comes amid increasing competition in the stablecoin market, which could further impact Circle's performance.