| SC 13G/A | 2018-10-10 | PRICE T ROWE ASSOCIATES INC /MD/ | SONIC CORP | 33,980 | 0.0% | EDGAR |
| SC 13G/A | 2018-10-10 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | SONIC CORP | 0 | 0.0% | EDGAR |
| SC 13G | 2018-09-25 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | SONIC CORP | 6,370,000 | 17.8% | EDGAR |
| SC 13G/A | 2018-08-08 | VANGUARD GROUP INC | SONIC CORP | 3,669,401 | 10.2% | EDGAR |
| SC 13D/A | 2018-06-19 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | SONIC CORP | 6,436,879 | 17.3% | EDGAR |
| SC 13D/A | 2018-04-04 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | SONIC CORP | 6,436,879 | 17.3% | EDGAR |
| SC 13G/A | 2018-02-14 | PRICE T ROWE ASSOCIATES INC /MD/ | SONIC CORP | 4,896,840 | 12.5% | EDGAR |
| SC 13G/A | 2018-02-12 | VANGUARD GROUP INC | SONIC CORP | 3,536,777 | 9.0% | EDGAR |
| SC 13G/A | 2018-02-12 | VANGUARD GROUP INC | SONIC CORP | 3,536,777 | 9.0% | EDGAR |
| SC 13G/A | 2018-01-23 | BlackRock Inc. | SONIC CORP | 5,171,678 | 12.8% | EDGAR |
| SC 13D | 2017-12-18 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | SONIC CORP | 6,436,879 | 16.0% | EDGAR |
| SC 13G/A | 2017-07-10 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | SONIC CORP | 6,370,000 | 15.4% | EDGAR |
| SC 13G/A | 2017-04-10 | PRICE T ROWE ASSOCIATES INC /MD/ | SONIC CORP | 4,655,587 | 10.5% | EDGAR |
| SC 13G/A | 2017-02-14 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | SONIC CORP | 4,590,108 | 10.2% | EDGAR |
| SC 13G/A | 2017-02-13 | VANGUARD GROUP INC | SONIC CORP | 3,519,607 | 7.5% | EDGAR |
| SC 13G/A | 2017-02-10 | CHILTON INVESTMENT CO LLC | SONIC CORP | 110,142 | 0.2% | EDGAR |
| SC 13G | 2017-02-07 | PRICE T ROWE ASSOCIATES INC /MD/ | SONIC CORP | 4,314,457 | 9.2% | EDGAR |
| SC 13G/A | 2017-01-17 | BlackRock Inc. | SONIC CORP | 5,107,420 | 10.9% | EDGAR |
| SC 13G | 2016-11-10 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | SONIC CORP | 4,590,108 | 10.2% | EDGAR |
| SC 13G/A | 2016-10-07 | BlackRock Inc. | SONIC CORP | 4,810,318 | 10.1% | EDGAR |