Stocks that traded heavily or had substantial price changes Thursday:

       Costco Wholesale Corp., up $3.53 to 452.87.

       The warehouse club operator reported encouraging September sales.

       Twitter Inc., up $2.68 to $63.97.

       The social media company is selling its MoPub business to AppLovin for just over $1 billion.

       Levi Strauss & Co., up $2.05 to $26.29.

       The jeans maker reported strong third-quarter profit and revenue.

       Pfizer Inc., up 72 cents to $42.74.

       The drug developer asked the U.S. government to allow use of its COVID-19 vaccine in children ages 5 to 11.

       Lamb Weston Holdings Inc., down $4.14 to $58.20.

       The frozen foods supplier’s fiscal first-quarter profit and revenue fell short of Wall Street forecasts.

       Helen of Troy Ltd., up $12.83 to $230.87.

       The maker of OXO kitchen ware and other consumer goods reported strong fiscal second-quarter financial results.

       Meredith Corp., up $3.53 to $58.08.

       Barry Diller’s IAC is buying the publisher of People, Southern Living and InStyle.

       Kellogg Co., down $1.29 to $63.11.

       Work has halted at all of the company's U.S. cereal plants as roughly 1,400 workers went on strike over pay and working conditions.