Shares of UnitedHealth Group are surging before the market open Friday as Warren Buffett’s Berkshire Hathaway disclosed that it recently purchased shares of the beleaguered insurer.

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Yet as UnitedHealth's stock declined, Buffett's Berkshire Hathaway Inc. (BRK.B) (BRK.A) stepped in and bought 5.04 million shares, a stake valued at $1.57 billion as of June 30's close.

Although President Trump's tariff and trade policy is headline news, another factor is of far greater importance to the stock market.