| 1 | 541330 | ENGINEERING SERVICES | $2,874,553,874 | 11 |
| 2 | 541519 | OTHER COMPUTER RELATED SERVICES | $820,844,359 | 31 |
| 3 | 541512 | COMPUTER SYSTEMS DESIGN SERVICES | $303,973,077 | 6 |
| 4 | 541611 | ADMINISTRATIVE MANAGEMENT AND GENERAL MANAGEMENT CONSULTING SERVICES | $235,825,282 | 20 |
| 5 | 541511 | CUSTOM COMPUTER PROGRAMMING SERVICES | $205,924,586 | 4 |
| 6 | 541690 | OTHER SCIENTIFIC AND TECHNICAL CONSULTING SERVICES | $140,583,520 | 5 |
| 7 | 621999 | ALL OTHER MISCELLANEOUS AMBULATORY HEALTH CARE SERVICES | $120,112,199 | 1 |
| 8 | 541990 | ALL OTHER PROFESSIONAL, SCIENTIFIC, AND TECHNICAL SERVICES | $105,184,089 | 5 |
| 9 | 517110 | WIRED TELECOMMUNICATIONS CARRIERS | $98,250,776 | 5 |
| 10 | 561210 | FACILITIES SUPPORT SERVICES | $73,793,197 | 7 |
| 11 | 517911 | TELECOMMUNICATIONS RESELLERS | $65,759,235 | 2 |
| 12 | 611519 | OTHER TECHNICAL AND TRADE SCHOOLS | $43,534,200 | 1 |
| 13 | 423850 | SERVICE ESTABLISHMENT EQUIPMENT AND SUPPLIES MERCHANT WHOLESALERS | $39,873,163 | 6 |
| 14 | 336611 | SHIP BUILDING AND REPAIRING | $26,101,386 | 1 |
| 15 | 334220 | RADIO AND TELEVISION BROADCASTING AND WIRELESS COMMUNICATIONS EQUIPMENT MANUFACTURING | $25,698,791 | 1 |
| 16 | 423430 | COMPUTER AND COMPUTER PERIPHERAL EQUIPMENT AND SOFTWARE MERCHANT WHOLESALERS | $20,660,591 | 19 |
| 17 | 236210 | INDUSTRIAL BUILDING CONSTRUCTION | $15,870,114 | 1 |
| 18 | 561320 | TEMPORARY HELP SERVICES | $13,528,467 | 2 |
| 19 | 541620 | ENVIRONMENTAL CONSULTING SERVICES | $13,402,178 | 4 |
| 20 | 488390 | OTHER SUPPORT ACTIVITIES FOR WATER TRANSPORTATION | $12,232,898 | 1 |
| 21 | 611699 | ALL OTHER MISCELLANEOUS SCHOOLS AND INSTRUCTION | $10,864,222 | 1 |
| 22 | 611430 | PROFESSIONAL AND MANAGEMENT DEVELOPMENT TRAINING | $10,700,872 | 4 |
| 23 | 517312 | WIRELESS TELECOMMUNICATIONS CARRIERS (EXCEPT SATELLITE) | $10,424,025 | 1 |
| 24 | 334512 | AUTOMATIC ENVIRONMENTAL CONTROL MANUFACTURING FOR RESIDENTIAL, COMMERCIAL, AND APPLIANCE USE | $10,414,099 | 1 |
| 25 | 561612 | SECURITY GUARDS AND PATROL SERVICES | $9,939,627 | 1 |
| 26 | 339999 | ALL OTHER MISCELLANEOUS MANUFACTURING | $7,863,784 | 7 |
| 27 | 532283 | HOME HEALTH EQUIPMENT RENTAL | $7,088,000 | 1 |
| 28 | 541513 | COMPUTER FACILITIES MANAGEMENT SERVICES | $6,981,213 | 6 |
| 29 | 236220 | COMMERCIAL AND INSTITUTIONAL BUILDING CONSTRUCTION | $6,478,855 | 1 |
| 30 | 541612 | HUMAN RESOURCES CONSULTING SERVICES (2007), HUMAN RESOURCES AND EXECUTIVE SEARCH CONSULTING SERVICES (2002) | $5,549,317 | 1 |
| 31 | 541618 | OTHER MANAGEMENT CONSULTING SERVICES | $4,725,313 | 2 |
| 32 | 518210 | DATA PROCESSING, HOSTING, AND RELATED SERVICES | $4,636,049 | 1 |
| 33 | 541219 | OTHER ACCOUNTING SERVICES | $3,926,303 | 1 |
| 34 | 511210 | SOFTWARE PUBLISHERS | $2,487,254 | 3 |
| 35 | 237310 | HIGHWAY, STREET, AND BRIDGE CONSTRUCTION | $1,677,590 | 1 |
| 36 | 561720 | JANITORIAL SERVICES | $571,880 | 1 |
| 37 | 561110 | OFFICE ADMINISTRATIVE SERVICES | $361,677 | 1 |
| 38 | 562991 | SEPTIC TANK AND RELATED SERVICES | $342,680 | 1 |
| 39 | 517311 | WIRED TELECOMMUNICATIONS CARRIERS | $209,784 | 1 |
| 40 | 339113 | SURGICAL APPLIANCE AND SUPPLIES MANUFACTURING | $157,843 | 1 |
| 41 | 315999 | OTHER APPAREL ACCESSORIES AND OTHER APPAREL MANUFACTURING | $128,449 | 1 |
| 42 | 334111 | ELECTRONIC COMPUTER MANUFACTURING | $97,807 | 2 |
| 43 | 811310 | COMMERCIAL AND INDUSTRIAL MACHINERY AND EQUIPMENT (EXCEPT AUTOMOTIVE AND ELECTRONIC) REPAIR AND MAINTENANCE | $82,875 | 1 |
| 44 | 811219 | OTHER ELECTRONIC AND PRECISION EQUIPMENT REPAIR AND MAINTENANCE | $73,566 | 1 |
| 45 | 337214 | OFFICE FURNITURE (EXCEPT WOOD) MANUFACTURING | $62,825 | 2 |
| 46 | 519190 | ALL OTHER INFORMATION SERVICES | $61,018 | 1 |
| 47 | 334516 | ANALYTICAL LABORATORY INSTRUMENT MANUFACTURING | $56,193 | 1 |
| 48 | 333241 | FOOD PRODUCT MACHINERY MANUFACTURING | $51,055 | 12 |
| 49 | 561990 | ALL OTHER SUPPORT SERVICES | $45,560 | 1 |
| 50 | 337122 | NONUPHOLSTERED WOOD HOUSEHOLD FURNITURE MANUFACTURING | $35,764 | 1 |
| 51 | 541714 | RESEARCH AND DEVELOPMENT IN BIOTECHNOLOGY (EXCEPT NANOBIOTECHNOLOGY) | $15,000 | 6 |
| 52 | 423450 | MEDICAL, DENTAL, AND HOSPITAL EQUIPMENT AND SUPPLIES MERCHANT WHOLESALERS | $8,502 | 2 |
| 53 | 333316 | PHOTOGRAPHIC AND PHOTOCOPYING EQUIPMENT MANUFACTURING | $175 | 3 |