Express Scripts Holding Co. shares fell in early trading after the company said it will lose its biggest customer, health insurer Anthem Inc., which will drop the pharmacy benefit manager after accusing it of overcharging by billions of dollars a year. https://www.benefitnews.com/articles/express-scripts-plunges-after-losing-top-client-in-legal-dispute?feed=00000152-18a5-d58e-ad5a-99fd665c0000