Shares of technology companies ticked down in volatile trade, as momentum investors shifted bets.

Shares of companies considered to be "stay-at-home" bets, such as Zoom Video Communications, initially sold off, before rallying later in the session.

Shares of electric-car maker Tesla also opened lower, before rallying by more than 10% to test all-time highs. Tesla's gains came on the week that S&P Dow Jones Indexes said they would add its stock to the widely followed S&P 500 index.

Apple halved the commission it charges smaller developers that sell software through its App Store and generate no more than $1 million in revenue to 15%, a partial concession in its battle with critics over how it wields power in its digital ecosystem.

Write to Rob Curran at rob.curran@dowjones.com

(END) Dow Jones Newswires

11-18-20 1702ET