, executive vice president and CFO of Express Scripts Holding Co., St. Louis' largest public company, is stepping down from that role effective July 30 to "pursue other opportunities," according to company officials.<br />Hall was an integral figure in the execution of Express Scripts' blockbuster deal to acquire Medco Health Solutions for $29 billion in April 2012, which doubled the size of the St. Louis company and made it the nation's largest pharmacy benefits manager with more than 100 million members.<br />Hall will continue to work in a different role at Express Scripts until Sept. 1 to facilitate a smooth transition, officials said. Matthew Harper, vice president over financial planning and analysis, will serve as interim CFO, and Express Scripts has begun a search for Hall’s successor.<br />Express Scripts also reported Monday that its second-quarter net income spiked to $550.5 million compared with $153 million in last year’s period when profit was down due to costs associated with its $29 billion acquisition of Medco Health Solutions.<br />For the second quarter ended June 30, Express Scripts' revenue fell 4 percent to $26.4 billion compared with the second quarter of 2012. Express Scripts officials said adjusted claims from continuing operations were down 7 percent in the recent quarter from the second quarter of 2012, reflecting the expected roll-off of claims from United Healthcare Group. One of Express Scripts’ largest clients, UnitedHealthcare is bringing its PBM business in-house.<br />Last month, Express Scripts officials announced that, pending the approval of tax incentives, the company would expand its St. Louis headquarters by adding 1,500 jobs over the next few years, starting with the construction of a $56 million building.<br />Express Scripts Holding Co. (Nasdaq: ESRX), led by Chairman and CEO George Paz, reported a 2012 profit of $1.33 billion on revenue of $93.86 billion.