| 1 | 541512 | COMPUTER SYSTEMS DESIGN SERVICES | $851,925,225 | 18 |
| 2 | 522390 | OTHER ACTIVITIES RELATED TO CREDIT INTERMEDIATION | $303,129,964 | 1 |
| 3 | 541715 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT NANOTECHNOLOGY AND BIOTECHNOLOGY) | $266,132,325 | 2 |
| 4 | 541519 | OTHER COMPUTER RELATED SERVICES | $160,163,996 | 65 |
| 5 | 541990 | ALL OTHER PROFESSIONAL, SCIENTIFIC, AND TECHNICAL SERVICES | $143,655,607 | 3 |
| 6 | 541611 | ADMINISTRATIVE MANAGEMENT AND GENERAL MANAGEMENT CONSULTING SERVICES | $137,100,079 | 30 |
| 7 | 541330 | ENGINEERING SERVICES | $115,869,876 | 8 |
| 8 | 561612 | SECURITY GUARDS AND PATROL SERVICES | $107,587,202 | 2 |
| 9 | 541612 | HUMAN RESOURCES CONSULTING SERVICES (2007), HUMAN RESOURCES AND EXECUTIVE SEARCH CONSULTING SERVICES (2002) | $49,562,169 | 1 |
| 10 | 236220 | COMMERCIAL AND INSTITUTIONAL BUILDING CONSTRUCTION | $32,871,214 | 4 |
| 11 | 541511 | CUSTOM COMPUTER PROGRAMMING SERVICES | $29,730,252 | 13 |
| 12 | 238160 | ROOFING CONTRACTORS | $21,286,173 | 1 |
| 13 | 561110 | OFFICE ADMINISTRATIVE SERVICES | $13,488,232 | 2 |
| 14 | 541613 | MARKETING CONSULTING SERVICES | $12,756,919 | 2 |
| 15 | 334111 | ELECTRONIC COMPUTER MANUFACTURING | $10,295,431 | 1 |
| 16 | 541513 | COMPUTER FACILITIES MANAGEMENT SERVICES | $8,000,091 | 2 |
| 17 | 541820 | PUBLIC RELATIONS AGENCIES | $7,456,517 | 3 |
| 18 | 541219 | OTHER ACCOUNTING SERVICES | $5,668,551 | 18 |
| 19 | 237990 | OTHER HEAVY AND CIVIL ENGINEERING CONSTRUCTION | $5,034,696 | 1 |
| 20 | 541930 | TRANSLATION AND INTERPRETATION SERVICES | $4,768,445 | 1 |
| 21 | 423430 | COMPUTER AND COMPUTER PERIPHERAL EQUIPMENT AND SOFTWARE MERCHANT WHOLESALERS | $4,420,025 | 1 |
| 22 | 541211 | OFFICES OF CERTIFIED PUBLIC ACCOUNTANTS | $3,721,302 | 2 |
| 23 | 541199 | ALL OTHER LEGAL SERVICES | $3,469,976 | 3 |
| 24 | 485111 | MIXED MODE TRANSIT SYSTEMS | $2,750,407 | 1 |
| 25 | 238210 | ELECTRICAL CONTRACTORS AND OTHER WIRING INSTALLATION CONTRACTORS | $2,303,349 | 1 |
| 26 | 492110 | COURIERS AND EXPRESS DELIVERY SERVICES | $2,225,354 | 1 |
| 27 | 611430 | PROFESSIONAL AND MANAGEMENT DEVELOPMENT TRAINING | $2,141,357 | 3 |
| 28 | 541620 | ENVIRONMENTAL CONSULTING SERVICES | $1,375,886 | 2 |
| 29 | 511120 | PERIODICAL PUBLISHERS | $1,084,572 | 1 |
| 30 | 561210 | FACILITIES SUPPORT SERVICES | $905,039 | 3 |
| 31 | 517110 | WIRED TELECOMMUNICATIONS CARRIERS | $824,821 | 1 |
| 32 | 561920 | CONVENTION AND TRADE SHOW ORGANIZERS | $614,130 | 1 |
| 33 | 517311 | WIRED TELECOMMUNICATIONS CARRIERS | $564,516 | 8 |
| 34 | 337214 | OFFICE FURNITURE (EXCEPT WOOD) MANUFACTURING | $526,904 | 10 |
| 35 | 519290 | WEB SEARCH PORTALS AND ALL OTHER INFORMATION SERVICES | $508,782 | 3 |
| 36 | 334517 | IRRADIATION APPARATUS MANUFACTURING | $435,001 | 1 |
| 37 | 532420 | OFFICE MACHINERY AND EQUIPMENT RENTAL AND LEASING | $382,122 | 2 |
| 38 | 561320 | TEMPORARY HELP SERVICES | $252,224 | 2 |
| 39 | 541720 | RESEARCH AND DEVELOPMENT IN THE SOCIAL SCIENCES AND HUMANITIES | $181,462 | 1 |
| 40 | 562111 | SOLID WASTE COLLECTION | $178,699 | 2 |
| 41 | 562112 | HAZARDOUS WASTE COLLECTION | $139,539 | 1 |
| 42 | 561450 | CREDIT BUREAUS | $127,169 | 2 |
| 43 | 541690 | OTHER SCIENTIFIC AND TECHNICAL CONSULTING SERVICES | $124,703 | 2 |
| 44 | 485112 | COMMUTER RAIL SYSTEMS | $88,555 | 3 |
| 45 | 517312 | WIRELESS TELECOMMUNICATIONS CARRIERS (EXCEPT SATELLITE) | $87,982 | 1 |
| 46 | 541618 | OTHER MANAGEMENT CONSULTING SERVICES | $84,623 | 1 |
| 47 | 513199 | ALL OTHER PUBLISHERS | $82,075 | 1 |
| 48 | 813910 | BUSINESS ASSOCIATIONS | $80,979 | 1 |
| 49 | 811310 | COMMERCIAL AND INDUSTRIAL MACHINERY AND EQUIPMENT (EXCEPT AUTOMOTIVE AND ELECTRONIC) REPAIR AND MAINTENANCE | $59,686 | 2 |
| 50 | 611710 | EDUCATIONAL SUPPORT SERVICES | $43,800 | 1 |
| 51 | 333316 | PHOTOGRAPHIC AND PHOTOCOPYING EQUIPMENT MANUFACTURING | $43,490 | 1 |
| 52 | 561410 | DOCUMENT PREPARATION SERVICES | $21,082 | 1 |
| 53 | 513210 | SOFTWARE PUBLISHERS | $20,100 | 1 |
| 54 | 339940 | OFFICE SUPPLIES (EXCEPT PAPER) MANUFACTURING | $15,491 | 1 |