Sonic To Present At CIBC World Markets Sixth Annual Consumer Growth Conference

OKLAHOMA CITY (July 6, 2005) – Sonic Corp. (NASDAQ/GS:SONC), the nation’s largest chain of drive-in restaurants, today announced that it will participate in the CIBC World Markets Sixth Annual Consumer Growth Conference, which takes place in Boston July 11-12. The investor presentation by Sonic’s management is scheduled at 1:45 p.m. ET on Wednesday, July 12, 2006, and will be available to investors via a live audio webcast. A link to the webcast can be found at the investor section of the company’s website, www.sonicdrivein.com. The event will be available for replay for a period of 30 days using the same link.

Sonic, America’s Drive-In, originally started as a hamburger and root beer stand in 1953 in Shawnee, Okla., called Top Hat Drive-In, and then changed its name to Sonic in 1959. The first drive-in to adopt the Sonic name is still serving customers in Stillwater, Okla. Sonic has approximately 3,000 drive-ins coast to coast and in Mexico. More than a million customers eat at Sonic every day. For more information about Sonic Corp. and its subsidiaries, visit Sonic at www.sonicdrivein.com.

Contact Information

Stephen C. Vaughan

Vice President and Chief Financial Officer

Sonic Corp.

Contact via E-mail