Shares of Discovery and ViacomCBS tumbled on separate downgrades from Wells Fargo on Friday, as analysts expressed concerned that the media companies’ recent gains may be overblown. In early-day trading, ViacomCBS saw its stock sink more than 12 percent, to $57.76, as shares of Discovery plunged more than 21 percent, to $45.50. ViacomCBS, which operates…

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