OKLAHOMA CITY--(BUSINESS WIRE)--Sonic Corp. (NASDAQ:SONC), the nation's largest chain of drive-in restaurants, today announced several promotions in its leadership team. Stephen C. Vaughan, the Company’s Executive Vice President and Chief Financial Officer, was promoted to Executive Vice President of Franchise Operations, Finance and Planning. Claudia S. San Pedro, the Company’s Vice President of Investor Relations, Communications and Treasurer, was promoted to Senior Vice President, Chief Fina
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