Stock market today: Dow, S&P 500, Nasdaq futures slip as doubts about US stocks' resilience creep in

Shares in UnitedHealth were set to build on the previous session’s rebound, up 2% in premarket trading even as the company continues to grapply with an abrupt leadership change and a report of a criminal fraud probe.

The health insurer’s stock jumped over 8% on Monday after an SEC filing showed its returning CEO Stephen Hemsley and other company insiders bought a chunk of shares. UnitedHealth’s stock slumped to a five-year low last week amid the negative headlines.