| 2001 | 8 | 978 | $147,648,428 | $0 | - |
| MITCHELL ENERGY & DEVELOPMENT CORP. RETIREMENT PLAN | - | 856 | $147,648,428 | - | - |
| Mitchell Energy & Development Corp. Medical Care Benefits Plan | - | 827 | - | - | - |
| Mitchell Energy & Development Corp Employee Assistance Center | - | 978 | - | - | - |
| Mitchell Energy & Development Corp. Severance Benefit Plan | - | 978 | - | - | - |
| Mitchell Energy & Development Corp. Group Term Life Insurance Plan | - | 918 | - | - | - |
| Mitchell Energy & Development Corp. Group Dental Plan | - | 830 | - | - | - |
| Mitchell Energy & Development Corp. Group Long Term Disability Plan | - | 854 | - | - | - |
| Mitchell Energy & Development Corp. Group Basic & Supplemental Ad&D | - | 918 | - | - | - |
| 2000 | 10 | 965 | $347,289,641 | $5,983,988 | $6,201iApproximate average salary by contribution assumption: employee only about $155,026 at 4% or $103,350 at 6%; with 50% employer match about $103,350 at 4% or $68,900 at 6%; with 100% employer match about $77,513 at 4% or $51,675 at 6%. |
| The Mitchell Energy & Development Corp. Thrift and Savings Plan | - | 890 | $175,208,733 | $5,983,988 | $6,724iApproximate average salary by contribution assumption: employee only about $168,090 at 4% or $112,060 at 6%; with 50% employer match about $112,060 at 4% or $74,706 at 6%; with 100% employer match about $84,045 at 4% or $56,030 at 6%. |
| MITCHELL ENERGY & DEVELOPMENT CORP. RETIREMENT PLAN | - | 847 | $172,080,908 | - | - |
| Mitchell Energy & Development Corp Employee Assistance Center | - | 913 | - | - | - |
| Mitchell Energy & Development Corp. Group Long Term Disability Plan | - | 812 | - | - | - |
| Mitchell Energy & Development Corp. Severance Benefit Plan | - | 913 | - | - | - |
| Mitchell Energy & Development Corp. Business Travel Insurance Policy | - | 965 | - | - | - |
| Mitchell Energy & Development Corp. Group Basic & Supplemental Ad&D | - | 893 | - | - | - |
| Mitchell Energy & Development Corp. Group Term Life Insurance Plan | - | 861 | - | - | - |
| Mitchell Energy & Development Corp. Medical Care Benefits Plan | - | 794 | - | - | - |
| Mitchell Energy & Development Corp. Group Dental Plan | - | 800 | - | - | - |
| 1999 | 9 | 907 | $149,135,280 | $6,916,096 | $7,625iApproximate average salary by contribution assumption: employee only about $190,631 at 4% or $127,087 at 6%; with 50% employer match about $127,087 at 4% or $84,725 at 6%; with 100% employer match about $95,316 at 4% or $63,544 at 6%. |
| The Mitchell Energy & Development Corp. Thrift and Savings Plan | - | 880 | $149,135,280 | $6,916,096 | $7,859iApproximate average salary by contribution assumption: employee only about $196,480 at 4% or $130,987 at 6%; with 50% employer match about $130,987 at 4% or $87,324 at 6%; with 100% employer match about $98,240 at 4% or $65,493 at 6%. |
| Mitchell Energy & Development Corp. Group Basic & Supplemental Ad&D | - | 860 | - | - | - |
| Mitchell Energy & Development Corp. Group Dental Plan | - | 781 | - | - | - |
| Mitchell Energy & Development Corp. Severance Benefit Plan | - | 865 | - | - | - |
| Mitchell Energy & Development Corp Employee Assistance Center | - | 865 | - | - | - |
| Mitchell Energy & Development Corp. Business Travel Insurance Policy | - | 907 | - | - | - |
| Mitchell Energy & Development Corp. Group Long Term Disability Plan | - | 794 | - | - | - |
| Mitchell Energy & Development Corp. Medical Care Benefits Plan | - | 769 | - | - | - |
| Mitchell Energy & Development Corp. Group Term Life Insurance Plan | - | 860 | - | - | - |