| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2007-05-10 | NEUBERGER BERMAN INC | ARCH COAL INC | 7,297,123 | 5.1% | EDGAR |
| SC 13G/A | 2007-02-14 | FMR CORP | ARCH COAL INC | 16,795,026 | 11.8% | EDGAR |
| SC 13G/A | 2007-02-14 | WELLINGTON MANAGEMENT CO LLP | ARCH COAL INC | 6,409,450 | 4.5% | EDGAR |
| SC 13G/A | 2007-02-13 | NEUBERGER BERMAN INC | ARCH COAL INC | 15,223,386 | 10.7% | EDGAR |
| SC 13G | 2007-02-12 | CAPITAL RESEARCH & MANAGEMENT CO | ARCH COAL INC | 7,800,000 | 5.5% | EDGAR |
| SC 13G | 2007-02-12 | CAPITAL GROUP INTERNATIONAL INC | ARCH COAL INC | 8,286,640 | 5.8% | EDGAR |
| SC 13G/A | 2006-02-15 | NEUBERGER BERMAN INC | ARCH COAL INC | 7,421,524 | 11.5% | EDGAR |
| SC 13G/A | 2006-02-14 | FMR CORP | ARCH COAL INC | 8,054,804 | 12.5% | EDGAR |
| SC 13G | 2006-02-14 | WELLINGTON MANAGEMENT CO LLP | ARCH COAL INC | 4,071,760 | 6.3% | EDGAR |
| SC 13G/A | 2006-02-10 | APPALOOSA PARTNERS INC | ARCH COAL INC | 1,138,546 | 1.8% | EDGAR |
| SC 13G/A | 2005-12-12 | FMR CORP | ARCH COAL INC | 8,289,854 | 12.8% | EDGAR |
| SC 13G | 2005-10-11 | NEUBERGER BERMAN INC | ARCH COAL INC | 7,741,286 | 12.1% | EDGAR |
| SC 13G | 2005-07-21 | SPROTT ASSET MANAGEMENT INC | ARCH COAL INC | - | - | EDGAR |
| SC 13G | 2005-07-08 | SPROTT ASSET MANAGEMENT INC | ARCH COAL INC | - | - | EDGAR |
| SC 13G/A | 2005-02-14 | FMR CORP | ARCH COAL INC | 3,721,780 | 6.0% | EDGAR |
| SC 13G/A | 2005-02-14 | PRUDENTIAL FINANCIAL INC | ARCH COAL INC | - | - | EDGAR |
| SC 13G | 2005-02-11 | JENNISON ASSOCIATES LLC | ARCH COAL INC | 856,100 | 1.4% | EDGAR |
| SC 13G/A | 2005-02-09 | APPALOOSA MANAGEMENT LP | ARCH COAL INC | 1,782,019 | 2.9% | EDGAR |
| SC 13G/A | 2004-11-10 | FMR CORP | ARCH COAL INC | 3,462,880 | 5.5% | EDGAR |
| SC 13G/A | 2004-07-12 | FMR CORP | ARCH COAL INC | 5,952,960 | 10.9% | EDGAR |