| 2009 Rank | Company Name | 2008 Revenue |
| 66 | CompuCom Systems, Inc. | $2,000,000,000 |
| 167 | Compugen Inc. | $287,000,000 |
| 190 | Computer Aid | $233,092,354 |
| 264 | Computer Design and Integration LLC | $125,000,000 |
| 225 | Computer Generated Solutions Inc. | $173,000,000 |
| 229 | Computer Merchant, Ltd., The | $166,329,980 |
| 6 | Computer Sciences Corp. (CSC) | $16,500,000,000 |
| 382 | Computer Software Innovations Inc. | $57,427,262 |
| 151 | Computer Task Group | $353,213,000 |
| 103 | Comsys IT Services | $743,400,000 |
| 297 | Connextions | $95,100,000 |
| 277 | Consonus Technologies | $110,000,000 |
| 489 | Consultedge Inc. | $30,460,801 |
| 154 | Continental Resources Inc. | $340,000,000 |
| 432 | Convergenz LLC | $43,800,000 |
| 50 | Convergys Corp. | $2,785,800,000 |
| 287 | Core BTS | $100,000,000 |
| 293 | Corporate Technologies, Inc. | $98,000,000 |
| 131 | CSG Systems International Inc. | $472,100,000 |
| 343 | CSI Leasing | $71,000,000 |
| 406 | Custom Computer Specialists | $51,200,000 |
| 470 | CWPS | $37,000,000 |
| 270 | CXtec | $122,000,000 |
| 475 | Cybercore Technologies | $35,200,000 |
| 428 | Daly Computers Inc. | $44,000,000 |
| 362 | Data Networks of America | $64,956,000 |
| 213 | Datalink Corp. | $195,600,000 |
| 391 | DataPipe Incorporated | $55,000,000 |
| 369 | Daugherty Systems | $63,500,000 |
| 186 | DealerTrack Holdings Inc. | $242,706,000 |
| 211 | DecisionOne | $200,000,000 |
| 477 | Decisive Analytics | $35,000,000 |
| 24 | Dell Inc. | $5,715,000,000 |
| 10 | Deloitte Consulting | $10,980,000,000 |
| 445 | Delta Max | $41,950,000 |
| 379 | Descartes Systems Group (The) | $59,000,000 |
| 447 | Dewpoint Inc. | $41,213,185 |
| 221 | Diamond Management & Technology Consultants Inc. | $182,288,000 |
| 44 | Diebold Inc. | $3,170,080,000 |
| 460 | Digicon Corp. | $39,000,000 |
| 32 | Dimenson Data | $4,510,640,000 |
| 127 | DLT Solutions Inc. | $504,000,000 |
| 184 | DST Systems | $242,900,000 |
| 185 | Dynamics Research | $242,824,000 |
| 315 | Dynamix Group Inc. | $83,500,000 |
| 63 | DynCorp International | $2,139,761,000 |
| 295 | DynTek Services, Inc. | $96,400,000 |
| 257 | Echelon Corp. | $134,047,000 |
| 126 | Eclipsys | $515,762,000 |
| 478 | Edge Professional Services | $34,200,000 |