| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2008-02-14 | FMR LLC | CHESAPEAKE ENERGY CORP | 65,710,952 | 12.8% | EDGAR |
| SC 13G/A | 2008-02-13 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | CHESAPEAKE ENERGY CORP | - | 10.4% | EDGAR |
| SC 13G/A | 2008-01-23 | CHESAPEAKE ENERGY CORP | GASTAR EXPLORATION LTD | 33,908,836 | 16.3% | EDGAR |
| SC 13D/A | 2007-08-14 | WARD TOM L | CHESAPEAKE ENERGY CORP | 23,816,390 | 5.0% | EDGAR |
| SC 13G/A | 2007-05-10 | FMR CORP | CHESAPEAKE ENERGY CORP | 47,601,056 | 10.3% | EDGAR |
| SC 13D/A | 2007-03-16 | WARD TOM L | CHESAPEAKE ENERGY CORP | 23,816,390 | 5.2% | EDGAR |
| SC 13G/A | 2007-03-07 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | CHESAPEAKE ENERGY CORP | - | 10.1% | EDGAR |
| SC 13G/A | 2007-02-14 | FMR CORP | CHESAPEAKE ENERGY CORP | 44,301,400 | 9.4% | EDGAR |
| SC 13G | 2007-02-12 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | CHESAPEAKE ENERGY CORP | - | 7.3% | EDGAR |
| SC 13G | 2007-01-05 | CHESAPEAKE ENERGY CORP | GASTAR EXPLORATION LTD | 32,151,641 | 16.6% | EDGAR |
| SC 13D | 2006-05-17 | WARD TOM L | CHESAPEAKE ENERGY CORP | 24,407,269 | 6.4% | EDGAR |
| SC 13D/A | 2006-04-28 | WARD TOM L | CHESAPEAKE ENERGY CORP | 24,407,269 | 6.4% | EDGAR |
| SC 13D | 2006-03-29 | WARD TOM L | CHESAPEAKE ENERGY CORP | 24,407,269 | 6.4% | EDGAR |
| SC 13D/A | 2006-02-22 | WARD TOM L | CHESAPEAKE ENERGY CORP | 22,368,025 | 5.9% | EDGAR |
| SC 13D | 2006-02-22 | WARD TOM L | CHESAPEAKE ENERGY CORP | 24,407,269 | 6.4% | EDGAR |
| SC 13D | 2006-02-22 | MCCLENDON AUBREY K | CHESAPEAKE ENERGY CORP | 22,368,025 | 5.9% | EDGAR |
| SC 13G/A | 2006-02-14 | FMR CORP | CHESAPEAKE ENERGY CORP | 21,104,815 | 5.7% | EDGAR |
| SC 13G/A | 2006-02-14 | WELLINGTON MANAGEMENT CO LLP | CHESAPEAKE ENERGY CORP | 7,828,310 | 2.1% | EDGAR |
| SC 13D | 2006-02-10 | CHESAPEAKE ENERGY CORP | PIONEER DRILLING CO | 0 | 0.0% | EDGAR |
| SC 13D | 2006-02-08 | CHESAPEAKE ENERGY CORP | PIONEER DRILLING CO | 7,701,905 | 16.5% | EDGAR |