The Principal U.S. Mega-Cap ETF has outperformed the S&P 500 and peers, benefiting from a strong mega-cap focus and lower volatility. USMC's portfolio is concentrated in 25 holdings, heavily weighted towards technology, financial services, and communication services, with a higher valuation than the S&P 500. Despite high interest rates and trade uncertainties, USMC's quality profile makes it a solid choice for exposure to mega-cap stocks.