According to @ReutersBiz, U.S. stocks ended sharply lower after major banks warned of potential market drawdowns driven by concerns over high valuations (source: @ReutersBiz, reut.rs/43fqYdw). According to @ReutersBiz, the warning from major banks underscores downside risk for equity markets tied to stretched valuations, signaling a risk-off backdrop for traders to monitor (source: @ReutersBiz, reut.rs/43fqYdw).