| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2001-02-09 | A I M MANAGEMENT GROUP INC /DE/ | PATTERSON ENERGY INC | 4,023,410 | 10.8% | EDGAR |
| SC 13G | 2001-02-09 | A I M MANAGEMENT GROUP INC /DE/ | PATTERSON ENERGY INC | 3,168,770 | 8.5% | EDGAR |
| SC 13G/A | 2000-02-17 | SNYDER HOLDINGS INC | PATTERSON ENERGY INC | 0 | 0.0% | EDGAR |
| SC 13G/A | 2000-02-17 | SNYDER HOLDINGS INC | PATTERSON ENERGY INC | 0 | 0.0% | EDGAR |
| SC 13G/A | 2000-02-17 | SNYDER HOLDINGS INC | PATTERSON ENERGY INC | 0 | 0.0% | EDGAR |