| SC 13G/A | 2004-02-09 | DELAWARE MANAGEMENT HOLDINGS CO INC | SONIC CORP | 1,810,320 | 4.6% | EDGAR |
| SC 13G/A | 2003-02-14 | FMR CORP | SONIC CORP | 5,804,057 | 14.9% | EDGAR |
| SC 13G/A | 2003-02-11 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | SONIC CORP | 702,190 | 1.8% | EDGAR |
| SC 13G/A | 2003-02-10 | PRICE T ROWE ASSOCIATES INC /MD/ | SONIC CORP | 1,865,975 | 4.8% | EDGAR |
| SC 13G/A | 2003-02-07 | DELAWARE MANAGEMENT HOLDINGS CO INC | SONIC CORP | 3,541,737 | 9.1% | EDGAR |
| SC 13G/A | 2002-02-14 | PRICE T ROWE ASSOCIATES INC /MD/ | SONIC CORP | 1,718,350 | 6.4% | EDGAR |
| SC 13G/A | 2002-02-14 | FMR CORP | SONIC CORP | 3,850,425 | 14.5% | EDGAR |
| SC 13G/A | 2002-02-12 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | SONIC CORP | 1,491,723 | 5.6% | EDGAR |
| SC 13G/A | 2002-02-07 | DELAWARE MANAGEMENT HOLDINGS CO INC | SONIC CORP | 2,187,982 | 8.2% | EDGAR |
| SC 13G/A | 2002-02-06 | A I M MANAGEMENT GROUP INC /DE/ | SONIC CORP | 1,274,211 | 4.8% | EDGAR |
| SC 13G/A | 2001-02-14 | FMR CORP | SONIC CORP | 3,340,375 | 12.7% | EDGAR |
| SC 13G/A | 2001-02-12 | PRICE T ROWE ASSOCIATES INC /MD/ | SONIC CORP | 2,531,050 | 9.5% | EDGAR |
| SC 13G/A | 2001-02-12 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | SONIC CORP | 1,315,821 | 5.0% | EDGAR |
| SC 13G | 2001-02-09 | A I M MANAGEMENT GROUP INC /DE/ | SONIC CORP | 1,697,720 | 6.4% | EDGAR |
| SC 13G/A | 2001-02-07 | DELAWARE MANAGEMENT HOLDINGS CO INC | SONIC CORP | 2,503,767 | 9.5% | EDGAR |
| SC 13G/A | 2001-01-10 | AMVESCAP PLC \GA\ | SONIC CORP | 0 | 0.0% | EDGAR |
| SC 13G/A | 2000-06-08 | - | - | - | - | EDGAR |
| SC 13G/A | 2000-02-11 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | SONIC CORP | 1,606,462 | 8.8% | EDGAR |
| SC 13G/A | 2000-02-11 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | SONIC CORP | 1,606,462 | 8.8% | EDGAR |
| SC 13G/A | 2000-02-11 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | SONIC CORP | 1,606,462 | 8.8% | EDGAR |