Top 25 Homeland Security Contractors
Total Purchases: $11,724,035,867
| Rank | Parent Company | Amount | Market Share |
| 1 | Lockheed Martin Corp. | $473,457,872 | 4.03% |
| 2 | Northrop Grumman Corp. | 447,304,824 | 3.81 |
| 3 | IBM Corp. | 440,776,859 | 3.75 |
| 4 | L-3 Communications Holdings | 350,460,252 | 2.98 |
| 5 | Unisys Corp. | 315,379,645 | 2.69 |
| 6 | SAIC | 294,678,026 | 2.51 |
| 7 | Boeing Co. | 265,451,818 | 2.26 |
| 8 | Booz Allen Hamilton Inc. | 240,883,220 | 2.05 |
| 9 | General Electric Co. | 198,891,533 | 1.69 |
| 10 | Accenture | 192,027,979 | 1.63 |
| 11 | General Dynamics Corp. | 187,425,954 | 1.59 |
| 12 | Fluor Corp. | 172,264,101 | 1.46 |
| 13 | Covenant Services Worldwide | 143,856,598 | 1.22 |
| 14 | QinetiQ Ltd. | 143,015,485 | 1.21 |
| 15 | URS Corp. | 129,552,029 | 1.10 |
| 16 | Computer Sciences Corp. | 128,003,957 | 1.09 |
| 17 | Siemens AG | 119,380,585 | 1.01 |
| 18 | Corrections Corp. of America | 116,596,246 | 0.99 |
| 19 | Smith Group PLC | 115,306,858 | 0.98 |
| 20 | AKAL Security Inc. | 109,156,692 | 0.93 |
| 21 | Cooperative Personnel Services | 104,585,030 | 0.89 |
| 22 | American Eurocopter Corp. | 102,241,509 | 0.87 |
| 23 | Michael Baker Corp. | 95,873,234 | 0.81 |
| 24 | Motorola Inc. | 84,680,351 | 0.72 |
| 25 | G4S PLC | 83,527,335 | 0.71 |
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