Aetna

CVS has been grappling with falling profit margins at its retail pharmacies and rising costs of patient care from Aetna, which generates about a third of its revenue.

Pressure from Warren could help sway the FTC toward issuing a second request for information from CVS and Oak Street.

Rite Aid Corp. shares sank after the drugstore operator’s proposed merger with Albertsons Cos. was called off, leaving the company with dwindling options amid a rapid transformation of the pharmacy business.