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The group is comprised of Facebook, Amazon.com, Apple Inc (AAPL.O), Netflix (NFLX.O) and Google parent Alphabet Inc (GOOGL.O).
Amazon.com, Berkshire Hathawayand JPMorgan Chase & Co said they will form a company to cut health costs for hundreds of thousands of their employees.
Fresh worries over competition hit Ahold (AD.AS) and other European retail stocks in opening deals on Friday.
Apple Inc (AAPL.O) is expected to announce plans next week to make its Siri voice assistant work with a larger variety of apps.
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