Sardar Biglari, a well-known activist investor and the chief executive of Steak n Shake and Western Sizzlin, has disclosed a 5.9-percent stake in the struggling Sonic Corp. The filing this week by Biglari, whose San Antonio-based Biglari Holdings Inc. owns the Steak n Shake and Western Sizzlin brands, follows a disclosure earlier this summer that he now holds a 6-percent stake in Red Robin Gourmet Burgers Inc. Both investments were filed with federal regulators under a 13G schedule, ...

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