Sen. Elizabeth Warren, the Massachusetts Democrat and presidential candidate, proposed on Friday a plan to break up big tech companies like Amazon, Facebook, and Alphabet's Google. The plan doesn't appear to immediately threaten Amazon, said Eric Sheridan, an analyst at UBS, who spoke with Markets Insider on Friday. Still, regulation is the top concern he discusses with investors, as far as challenges facing large-cap tech names.  Watch Amazon trade in real-time. Sen. Elizabeth Warren,...


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