| SC 13G/A | 2013-02-08 | BlackRock Inc. | SONIC CORP | 4,309,530 | 7.6% | EDGAR |
| SC 13G/A | 2012-06-11 | WELLINGTON MANAGEMENT CO LLP | SONIC CORP | 2,676,596 | 4.4% | EDGAR |
| SC 13G/A | 2012-04-09 | Invesco Ltd. | SONIC CORP | 6,144,719 | 10.1% | EDGAR |
| SC 13G/A | 2012-02-14 | FMR LLC | SONIC CORP | 8,869,638 | 14.3% | EDGAR |
| SC 13G/A | 2012-02-14 | WELLINGTON MANAGEMENT CO LLP | SONIC CORP | 5,889,784 | 9.7% | EDGAR |
| SC 13G | 2012-02-14 | DREMAN VALUE MANAGEMENT L L C | SONIC CORP | 3,465,858 | 5.7% | EDGAR |
| SC 13G/A | 2012-02-10 | Invesco Ltd. | SONIC CORP | 4,676,879 | 7.7% | EDGAR |
| SC 13G/A | 2012-02-10 | BlackRock Inc. | SONIC CORP | 4,708,876 | 7.6% | EDGAR |
| SC 13G | 2012-02-10 | PRICE T ROWE ASSOCIATES INC /MD/ | SONIC CORP | 3,184,580 | 5.2% | EDGAR |
| SC 13G | 2012-02-08 | VANGUARD GROUP INC | SONIC CORP | 3,134,428 | 5.0% | EDGAR |
| SC 13G/A | 2012-01-10 | EATON VANCE MANAGEMENT | SONIC CORP | 121,758 | 0.2% | EDGAR |
| SC 13G/A | 2011-02-14 | FMR LLC | SONIC CORP | 8,544,579 | 13.9% | EDGAR |
| SC 13G/A | 2011-02-14 | WELLINGTON MANAGEMENT CO LLP | SONIC CORP | 6,422,976 | 10.4% | EDGAR |
| SC 13G | 2011-02-14 | Invesco Ltd. | SONIC CORP | 4,291,704 | 7.0% | EDGAR |
| SC 13G | 2011-02-14 | DREMAN VALUE MANAGEMENT L L C | SONIC CORP | 3,466,685 | 5.6% | EDGAR |
| SC 13G/A | 2011-02-08 | BlackRock Inc. | SONIC CORP | 4,695,748 | 7.6% | EDGAR |
| SC 13G/A | 2011-01-18 | EATON VANCE MANAGEMENT | SONIC CORP | 3,929,157 | 6.4% | EDGAR |
| SC 13G/A | 2010-12-09 | EARNEST PARTNERS LLC | SONIC CORP | 768,666 | 1.3% | EDGAR |
| SC 13G/A | 2010-11-01 | BIGLARI HOLDINGS INC. | SONIC CORP | 0 | 0.0% | EDGAR |
| SC 13G | 2010-08-03 | BIGLARI HOLDINGS INC. | SONIC CORP | 3,623,668 | 5.9% | EDGAR |