| Rank | Parent Company | Amount ($000s) | Market Share (%) |
| 1 | University of California System | | 3,343,074 | | 19.78 |
| 2 | Bechtel Group Inc. | | 2,046,739 | | 12.11 |
| 3 | Lockheed Martin Corp. | | 2,002,190 | | 11.84 |
| 4 | BNFL Inc. | | 1,804,847 | | 10.68 |
| 5 | Fluor Corp. | | 1,171,233 | | 6.93 |
| 6 | Kaiser Hill Co. LLC | | 656,000 | | 3.88 |
| 7 | Battelle Memorial Institute | | 653,680 | | 3.87 |
| 8 | McDermott Inc. | | 573,499 | | 3.39 |
| 9 | University of Chicago | | 487,731 | | 2.89 |
| 10 | Brookhaven Science Assoc. LLC | | 403,921 | | 2.39 |
| 11 | Honeywell Inc. | | 348,737 | | 2.06 |
| 12 | Universities Research Assn. | | 297,085 | | 1.76 |
| 13 | Day & Zimmermann Inc. | | 281,997 | | 1.67 |
| 14 | University of Tennessee System | | 279,666 | | 1.65 |
| 15 | Stanford University | | 202,674 | | 1.20 |
| 16 | TRW Inc. | | 192,042 | | 1.14 |
| 17 | Midwest Research Institute | | 169,075 | | 1.00 |
| 18 | Ohio Valley Electric Corp. | | 164,944 | | 0.98 |
| 19 | Wackenhut Corp. | | 154,758 | | 0.92 |
| 20 | Electric Energy Inc. | | 140,200 | | 0.83 |
| 21 | Southeastern Universities Research Assn. | 95,254 | 0.56 |
| 22 | Oak Ridge Assoc. Universities | | 87,395 | | 0.52 |
| 23 | Washington Group International | | 73,885 | | 0.44 |
| 24 | Foster Wheeler Corp. | | 61,216 | | 0.36 |
| 25 | Nuclear Fuel Services Inc. | | 60,218 | | 0.36 |