Communications services companies fell sharply as investors fled sectors that have led the bull market since March.

Shares of Netflix, among the leading stocks in the six-month rally, fell Wednesday. Among the few gainers on the stock market was richly valued video-conferencing software maker Zoom Video Communications.

Walt Disney is delaying the release of several movies, including its highly anticipated Marvel spinoff "Black Widow," by six months in the latest sign Hollywood's top movie studio remains wary of releasing big-budget films amid the fractured theatrical landscape.

Journalist Bob Woodward's latest book, "Rage," sold 600,000 copies across all formats through its first week on sale in the U.S., fewer than two other recent high-profile titles about the Trump administration, according to ViacomCBS's Simon & Schuster publishing unit.

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