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

Shares of Insulet Corp. cratered 20.1% to $133.26 on what proved to be an all-around mixed trading session for the stock market, with the Dow Jones Industrial Average rising 0.5% to 54,349.12 and the S&P 500 Index falling 0.2% to 7,723.55.

This was the stock's second consecutive day of losses.

Insulet Corp. closed 62.4% below its 52-week high of $354.88, which the company achieved on November 20th.

The stock underperformed when compared to some of its peers, as Eli Lilly & Co. rose 4.9% to $1,169.86, DexCom Inc. fell 4.9% to $82.66, and Johnson & Johnson rose 1.04% to $257.59.

Trading volume totaled 7.1 million, compared to the 50-day average of 1.5 million.

Data source: Dow Jones Market Data, FactSet