Warren Buffett is telling investors something -- not through what he has said, but through his actions with the balance sheet of his investment conglomerate Berkshire Hathaway ( BRK.A -0.40%) ( BRK.B 0.83%). These actions should be taken as a warning sign with the stock market reaching elevated valuation levels in recent months.

US stocks retreated on Tuesday as investors digested the latest wave of corporate earnings, economic data, and various tariff updates. Palantir (PLTR) stock jumped roughly 7% after the company's earnings report beat expectations and revealed its revenue had topped $1 billion in a quarter for the first time.

U.S. stocks drifted to a mixed finish as President Donald Trump’s tariffs on dozens of countries had only a muted effect on markets worldwide.