Express Scripts Plunges as Biggest Client Threatens to Leave

  • Most pharmaceutical savings will go to clients, CEO says
  • Stock drops 6.9 percent in biggest decline since 2012

Express Scripts Holding Co.sank in early trading Wednesday after health insurer Anthem Inc., its biggest client, threatened to ditch it for a competitor unless the pharmacy benefit manager can deliver $3 billion a year more in savings on drug costs.

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