1986: Express Scripts established.
1992: Initial public offering in June.
1994: Two-for-one split.
1996: Established ESI Canada, Annual Drug Trend Report and Outcomes Conference.
1998: Two-for-one split. Acquired ValueRX from Columbia/HCA.
1999: Acquired Diversified Pharmaceutical Services from SmithKline Beecham.
2000: First major PBM for Medicaid Program.
2001: RxHub joint venture. Two-for-one stock split.
2002: Acquired NPA, a privately held PBM.
2004: Acquired CuraScript Specialty Pharmacy.
2005: Two-for-one split.
2007: Two-for-one split, Acquired ConnectYourCare
2008: Acquired Pharmacy Services Division of Medical Services Company (MSC)
2009: Acquired WellPoint’s NextRx Subsidiaries
2010: Two-for-one split
2012: Acquired Medco Health Solutions, Inc.