Southeastern Asset Management, Inc. just filed a "Statement of acquisition of beneficial ownership", which is also known as a 13D. In the filing, it appears as though Southeastern Asset Management, Inc. claims to own 6,436,879 shares. This represents 16.0% of Sonic Corp..
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Other recent filings from the company include the following:
Sonic Declares Quarterly Dividend - April 12, 2018
Southeastern Asset Management, Inc. just provided an update on activist position in Sonic Corp. - April 4, 2018
Sonic Reports Second Fiscal Quarter 2018 Earnings Per Share Growth - March 27, 2018