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Newport Beach-based Alliance HealthCare Services Inc.’s stock reached a 12-month high today in advance of the arrival of its new chief executive.

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Alliance’s shares closed up 13% to a market value of about $288 million. The medical imaging provider’s shares are up 256% over the past six months.

Percy “Tom” Tomlinson Jr. is set to take over as Alliance’s chief executive tomorrow. Tomlinson replaces interim chief executive Larry Buckelew, who also is the company’s chairman. Buckelew had served as interim CEO since Paul Viviano left in 2012 to take over the University of California, San Diego Health System.