| SC 13G/A | 2012-02-14 | Tradewinds Global Investors, LLC | ARCH COAL INC | 23,508,865 | 11.1% | EDGAR |
| SC 13G | 2012-02-14 | Tradewinds Global Investors, LLC | ARCH COAL INC | 13,561,695 | 6.4% | EDGAR |
| SC 13G/A | 2012-02-13 | BlackRock Inc. | ARCH COAL INC | 15,452,296 | 7.3% | EDGAR |
| SC 13G/A | 2012-02-10 | PRICE T ROWE ASSOCIATES INC /MD/ | ARCH COAL INC | 24,900,456 | 11.7% | EDGAR |
| SC 13G | 2011-11-10 | Goodman & Company, Investment Counsel Ltd. | ARCH COAL INC | 4,894,600 | 2.3% | EDGAR |
| SC 13D | 2011-06-23 | ARCH COAL INC | International Coal Group, Inc. | 292,157,281 | 90.0% | EDGAR |
| SC 13G/A | 2011-02-14 | Capital World Investors | ARCH COAL INC | - | 0.0% | EDGAR |
| SC 13G/A | 2011-02-10 | PRICE T ROWE ASSOCIATES INC /MD/ | ARCH COAL INC | 16,667,833 | 10.2% | EDGAR |
| SC 13G | 2011-01-19 | Goodman & Company, Investment Counsel Ltd. | ARCH COAL INC | 8,244,900 | 5.1% | EDGAR |
| SC 13G/A | 2011-01-10 | BlackRock Inc. | ARCH COAL INC | 17,155,278 | 10.6% | EDGAR |
| SC 13G/A | 2010-10-12 | FMR LLC | ARCH COAL INC | 5,091,483 | 3.1% | EDGAR |
| SC 13G | 2010-08-10 | PRICE T ROWE ASSOCIATES INC /MD/ | ARCH COAL INC | 16,376,102 | 10.0% | EDGAR |
| SC 13G/A | 2010-05-10 | FMR LLC | ARCH COAL INC | 13,558,664 | 8.3% | EDGAR |
| SC 13G/A | 2010-05-10 | BlackRock Inc. | ARCH COAL INC | 16,478,300 | 10.1% | EDGAR |
| SC 13G | 2010-03-10 | Goodman & Company, Investment Counsel Ltd. | ARCH COAL INC | 8,459,100 | 5.2% | EDGAR |
| SC 13G/A | 2010-02-16 | FMR LLC | ARCH COAL INC | 22,817,263 | 14.0% | EDGAR |
| SC 13G/A | 2010-02-11 | Capital World Investors | ARCH COAL INC | 8,376,168 | 5.2% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | ARCH COAL INC | 15,021,034 | 9.2% | EDGAR |
| SC 13G | 2009-11-10 | Goodman & Company, Investment Counsel Ltd. | ARCH COAL INC | 7,988,450 | 4.9% | EDGAR |
| SC 13G/A | 2009-10-13 | FMR LLC | ARCH COAL INC | 20,390,665 | 12.6% | EDGAR |