Keysight Technologies Is the S&P 500’s Worst Performer. It Isn’t Because of Earnings.

Shares of Keysight Technologies were tumbling after the test equipment manufacturer offered disappointing guidance. Keysight stock was falling 9.6% to $144.41 in Tuesday trading, on track for its largest decline since Aug. 18, 2023, when it dropped 14%, according to Dow Jones Market Data. On Monday, for its second fiscal quarter ended April 30, the company reported adjusted earnings of $1.41 a share, beating Wall Street’s forecast of $1.39, according to FactSet.