| 2009 Rank | Company Name | 2008 Revenue |
| 310 | JDM Infrastructure LLC | $84,400,000 |
| 255 | Jeskell Inc. | $135,516,727 |
| 341 | Jorge Scientific Corp. | $72,300,000 |
| 115 | Juniper Networks Inc. | $661,416,000 |
| 411 | Kaseya International Limited | $50,000,000 |
| 82 | Keane Inc. | $1,200,000,000 |
| 318 | Key Information Systems Inc. | $81,872,000 |
| 419 | Knowledge Information Solutions Inc. | $47,500,000 |
| 30 | L-3 Communications | $4,638,450,000 |
| 143 | Larsen and Toubro Infotech | $396,510,203 |
| 364 | Laurus Technologies Inc. | $64,700,000 |
| 236 | Levi, Ray & Shoup | $154,872,914 |
| 269 | Lighthouse Computer Services | $122,509,114 |
| 421 | Lilien LLC | $46,047,915 |
| 176 | Liquidity Services | $263,900,000 |
| 9 | Lockheed Martin - Information Systems and Global Svcs. | $11,611,000,000 |
| 358 | Logical Choice Technologies | $65,400,000 |
| 87 | Logicalis Inc./Logicalis Group | $1,050,000,000 |
| 485 | LOGOS Communications Inc. | $33,000,000 |
| 248 | Long View Systems Corp. | $145,000,000 |
| 441 | Lowry Computer Products Inc. | $42,000,000 |
| 472 | Lumenate LP | $36,300,000 |
| 387 | Lyme Computer Systems Inc. | $56,000,000 |
| 84 | MacDonald, Dettwiler and Associates | $1,168,491,000 |
| 414 | Magenic Technologies | $49,400,000 |
| 117 | Mainline Information Systems Inc. | $623,000,000 |
| 335 | Management Network Group Inc., The | $74,042,000 |
| 391 | Manatron Inc. | $55,000,000 |
| 156 | Manhattan Associates | $337,201,000 |
| 69 | ManTech International Corp. | $1,810,879,000 |
| 393 | Marco Inc. | $54,800,000 |
| 280 | Marlabs Inc. | $105,000,000 |
| 399 | Maryville Technologies | $53,700,000 |
| 402 | Matlen Silver | $52,000,000 |
| 438 | Matrix Integration LLC | $42,235,000 |
| 102 | Maximus Inc. | $745,133,000 |
| 77 | McKesson Provider Technologies Services | $1,390,511,000 |
| 214 | MCPc Inc. | $194,000,000 |
| 142 | Medical Information Technology (MEDITECH) | $397,929,595 |
| 305 | Medidata Solutions Inc. | $86,300,000 |
| 457 | Mediware Information Systems | $39,437,000 |
| 226 | Megapath Networks | $168,000,000 |
| 155 | Meridian Group International Inc. | $339,000,000 |
| 263 | Merlin International, Inc. | $126,000,000 |
| 71 | Metavante Technologies, Inc. | $1,707,300,000 |
| 195 | MGL Americas | $222,197,541 |
| 192 | Micro Focus International | $228,200,000 |
| 352 | Micro Strategies Inc. | $69,000,000 |
| 125 | Micros Systems Inc. (includes Datavantage) | $529,520,000 |
| 401 | Microserve | $53,171,084 |