WhatsApp said it planned to appeal a decision by Nigerian officials to fine the company $220 million stemming from its May 2021 privacy policy.

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Shares of power producers ticked up as traders rotated into defensive sectors amid a broad flight from risk. Renewable energy producers and solar-power firms finished the week with significant losses.

Communications services companies fell slightly as traders continued to retreat from high-risk niches of the market. Cell-phone carriers were among the firms affected by widespread software outages.

Shares of technology companies fell after a widespread computer outage interrupted airline traffic, banking and other economic functions worldwide. CrowdStrike shares slid after the cybersecurity firm ...

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

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

Consumer companies fell sharply amid nervousness about the rate outlook. One strategist said the Federal Reserve could cut rates even sooner than the September move priced into the Fed funds futures ...

Health-care companies rose as traders rotated into defensive niches of the stock market. UnitedHealth Group added to recent gains, in the wake of the largest U.S. insurer by enrollees' earnings report ...