YieldMax ETFs Struggle Amid Market Volatility YieldMax ETFs, including AIYY and CONY, were among February's poorest performers, with declines of 30% and 29%, respectively. Factors such as declining cryptocurrency values and broader market downturns contributed to their underperformance. These funds focus on options strategies linked to stocks like Coinbase and C3.ai, but their returns remain capped by design.2