Stocks that traded heavily or had substantial price changes Friday:

       Roku Inc., down $32.25 to $112.46.

       The video streaming company gave investors a disappointing revenue forecast and warned about persistent supply chain problems.

       Exelixis Inc., up $1.22 to $19.56.

       The drug developer reported strong fourth-quarter financial results.

       Shake Shack Inc., down $3.11 to $72.07.

       The burger chain reported weak fourth-quarter earnings and gave investors a disappointing revenue forecast.

       Redfin Corp., down $5.78 to $22.86.

       The real estate broker gave investors a discouraging first-quarter forecast for net income.

       Celanese Corp., down $8 to $144.25.

       The chemical company is buying DuPont's Mobility & Materials business for $11 billion.

       Bloomin’ Brands Inc., up $1.70 to $24.19.

       The owner of Outback Steakhouse and other casual dining spots gave investors a solid profit forecast.

       Appian Inc., up $6.37 to $55.65.

       The business process management software provider gave Wall Street an encouraging earnings forecast.

       Livent Corp., up 54 cents to $22.69.

       The supplier of performance lithium compounds beat Wall Street's fourth-quarter profit and revenue forecasts.