Invesco S&P MidCap Momentum ETF (XMMO) maintains a 'buy' rating despite a 31.60x trailing P/E and valuation risks. XMMO has delivered 20.36% YTD and 111.89% total return since June 2019, outperforming mid-cap peers. The fund's performance is driven by AI-related infrastructure and semiconductor stocks, with strong momentum and Wall Street sentiment.