This article was automatically generated by Dow Jones using technology from Automated Insights.

Shares of Teradyne Inc. shed 4.7% to $383.85 on what proved to be an all-around mixed trading session for the stock market, with the Dow Jones Industrial Average rising 0.4% to 51,850.55 and the S&P 500 Index falling 0.1% to 7,807.24.

Teradyne Inc. closed 21.3% below its 52-week high of $487.91, which the company reached on June 30th.

The stock underperformed when compared to some of its peers, as Keysight Technologies Inc. fell 1.3% to $377.70, Fortive Corp. rose 0.2% to $57.37, and Cohu Inc. fell 4.37% to $65.21.

Trading volume totaled 2.6 million, compared to the 50-day average of 2.5 million.

Data source: Dow Jones Market Data, FactSet