The health insurance giant Cigna said on Thursday that it had agreed to buy Express Scripts, the nation’s largest pharmacy benefit manager, in a $52 billion deal that could further reshape the roiling health care landscape.
https://www.nytimes.com/2018/03/08/business/dealbook/cigna-express-scripts.html
Cigna buying Express Scripts will be the company's biggest mistake in it's history of operations. They tried to create their own PBM and this failed. They tried to work with and leverage Catamaran and this was even a bigger failure for the them. This company does not do integration well.Look at HealthSpring.