UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

        Date of Report (Date of earliest event reported):  September 10, 2004

SONIC CORP.
(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	0-18859 (Commission File Number)	73-1371046 (I.R.S. Employer Identification No.)
300 Johnny Bench Drive Oklahoma City, Oklahoma (Address of Principal Executive Offices)		73104 (Zip Code)

(405) 225-5000
(Registrant’s telephone number, including area code)

Check the appropriate box below if the form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

[  ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
[  ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
[  ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
[  ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

---

Item 8.01  Other Events

        On September 10, 2004, Sonic Corp. (the “Registrant”) issued a press release announcing the resignation of Pattye L. Moore as President of the Registrant effective October 31, 2004. The information in the press release attached hereto as Exhibit 99 is furnished pursuant to this Item 8.01.

Item 9.01   Financial Statements and Exhibits.

(c)       Exhibits.

99  Press Release, dated September 10, 2004, announcing the resignation of Pattye L. Moore as President

SIGNATURE

        Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

		REGISTRANT:
		SONIC CORP.
Date: September 21, 2004		By:		/s/ W. Scott McLain    W. Scott McLain, Executive Vice President and Chief Financial Officer

---

EXHIBIT INDEX

Exhibit No.		Description
99		Press Release, dated September 10, 2004 announcing the resignation of Pattye L. Moore as President