KEY POINTS
  • Carl Icahn published a searing letter opposing Cigna's $54 billion acquisition of pharmacy benefit manager Express Scripts.
  • Cigna CEO David Cordani says Icahn hasn't reached out to the company directly.
  • He says he's "disappointed" Icahn chose to share his concerns in an open letter.

Cigna CEO David Cordani told CNBC on Wednesday he is "disappointed" activist investor Carl Icahn aired his concerns about the health insurer's acquisition of Express Scripts in an open letter instead of sharing them with Cigna.

Icahn published a searing letter Tuesday opposing Cigna's $54 billion acquisition of pharmacy benefit manager Express Scripts. Titled "Cigna's $60 billion folly," Icahn said buying the company "may well become one of the worst blunders in corporate history."