Pharmacy benefit managers play an important but secretive role in controlling the prices of prescription drugs — and they're working hard to keep it that way. After Axios obtained a document that shed new light on this opaque process, Express Scripts, the country’s largest PBM, forced that document to be taken down.
Why it matters: Americans fill 4.5 billion prescriptions per year. The biggest pharmacy benefit managers are profiting from the vast majority of those transactions, largely through sophisticated and complex financial engineering. Critics argue these tactics contribute to the country's high drug prices, which makes it important to understand how all of this works.