Pharmacy Benefit Managers (PBMs) 'operate within a sphere of secrecy,' Black Rock Pharmacy co-owner Brad Arthur told CNBC.
Mylan pushed the blame for high EpiPen prices onto PBMs Thursday, causing share prices to dip. Analysts say investors were mislead.
Pretty much every company you can think of has donated to the Clinton Foundation. So has Donald Trump. Should it matter?
The recent harsh spotlight on the sector raises the question.