Wall Street’s record-setting rally is due for a reality check, according to the latest report from Stifel’s Barry Bannister and Thomas Carroll.

The S&P 500 dipped 0.3% after flirting with its all-time high, which was set two weeks ago, earlier in the day. The Dow Jones Industrial Average dropped 200 points, or 0.5%, while the Nasdaq composite shaved 0.3% off its own record.

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.