The largest pharmacy benefit manager in the country, Express Scripts (NASDAQ: ESRX), has seen its shares fall under serious pressure since reporting earnings. To keep investors up to speed with the stock, Motley Fool health care bureau chief Brenton Flynn breaks down some of the key changes to the company's latest SEC filings and compares his findings with the commentary from one of its big customers, UnitedHealth Group (NYSE:UNH).

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Brenton Flynn has no positions in the stocks mentioned above. The Motley Fool owns shares of Express Scripts. Motley Fool newsletter services recommend Express Scripts and UnitedHealth Group. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.