Oracle - after they buy Cerner. You heard it here first...
Amazon is making waves in the pharmacy space with Pill Pack and Amazon Pharmacy. That will be transformational in the coming years. Great deep dive piece on this here: https://www.vox.com/2020/11/23/21591193/amazon-pharmacy-prime-us-prescription-drug-prices
None of the above - Optum. Walmart and Amazon via Whole Foods