| 1 | 541512 | COMPUTER SYSTEMS DESIGN SERVICES | $4,899,065,483 | 61 |
| 2 | 541330 | ENGINEERING SERVICES | $2,254,472,803 | 102 |
| 3 | 517310 | TELECOMMUNICATIONS RESELLERS | $2,062,875,845 | 1 |
| 4 | 541513 | COMPUTER FACILITIES MANAGEMENT SERVICES | $1,205,260,352 | 13 |
| 5 | 541519 | OTHER COMPUTER RELATED SERVICES | $1,130,808,132 | 166 |
| 6 | 541611 | ADMINISTRATIVE MANAGEMENT AND GENERAL MANAGEMENT CONSULTING SERVICES | $1,019,228,802 | 109 |
| 7 | 517110 | WIRED TELECOMMUNICATIONS CARRIERS | $894,057,625 | 29 |
| 8 | 518210 | DATA PROCESSING, HOSTING, AND RELATED SERVICES | $543,617,152 | 17 |
| 9 | 541511 | CUSTOM COMPUTER PROGRAMMING SERVICES | $503,088,838 | 30 |
| 10 | 522110 | COMMERCIAL BANKING | $244,471,425 | 3 |
| 11 | 561210 | FACILITIES SUPPORT SERVICES | $242,289,615 | 31 |
| 12 | 541715 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT NANOTECHNOLOGY AND BIOTECHNOLOGY) | $229,583,396 | 6 |
| 13 | 541720 | RESEARCH AND DEVELOPMENT IN THE SOCIAL SCIENCES AND HUMANITIES | $228,477,025 | 16 |
| 14 | 561612 | SECURITY GUARDS AND PATROL SERVICES | $220,676,323 | 5 |
| 15 | 339999 | ALL OTHER MISCELLANEOUS MANUFACTURING | $204,164,500 | 1 |
| 16 | 531311 | RESIDENTIAL PROPERTY MANAGERS | $200,641,731 | 1 |
| 17 | 541310 | ARCHITECTURAL SERVICES | $185,526,571 | 7 |
| 18 | 561450 | CREDIT BUREAUS | $126,178,898 | 7 |
| 19 | 611430 | PROFESSIONAL AND MANAGEMENT DEVELOPMENT TRAINING | $115,433,638 | 6 |
| 20 | 531190 | LESSORS OF OTHER REAL ESTATE PROPERTY | $113,986,370 | 1 |
| 21 | 541910 | MARKETING RESEARCH AND PUBLIC OPINION POLLING | $100,342,760 | 1 |
| 22 | 541211 | OFFICES OF CERTIFIED PUBLIC ACCOUNTANTS | $95,509,809 | 16 |
| 23 | 517911 | TELECOMMUNICATIONS RESELLERS | $89,645,782 | 1 |
| 24 | 541219 | OTHER ACCOUNTING SERVICES | $83,372,788 | 5 |
| 25 | 517919 | ALL OTHER TELECOMMUNICATIONS | $77,790,723 | 7 |
| 26 | 611519 | OTHER TECHNICAL AND TRADE SCHOOLS | $70,383,626 | 1 |
| 27 | 523920 | PORTFOLIO MANAGEMENT | $64,119,780 | 2 |
| 28 | 334517 | IRRADIATION APPARATUS MANUFACTURING | $64,025,904 | 2 |
| 29 | 541990 | ALL OTHER PROFESSIONAL, SCIENTIFIC, AND TECHNICAL SERVICES | $62,658,675 | 16 |
| 30 | 541620 | ENVIRONMENTAL CONSULTING SERVICES | $54,711,324 | 31 |
| 31 | 561110 | OFFICE ADMINISTRATIVE SERVICES | $54,460,640 | 3 |
| 32 | 221122 | ELECTRIC POWER DISTRIBUTION | $46,919,735 | 2 |
| 33 | 561621 | SECURITY SYSTEMS SERVICES (EXCEPT LOCKSMITHS) | $43,212,066 | 20 |
| 34 | 511199 | ALL OTHER PUBLISHERS | $33,375,589 | 2 |
| 35 | 541380 | TESTING LABORATORIES AND SERVICES | $21,478,064 | 5 |
| 36 | 236220 | COMMERCIAL AND INSTITUTIONAL BUILDING CONSTRUCTION | $20,843,454 | 24 |
| 37 | 561720 | JANITORIAL SERVICES | $20,343,819 | 4 |
| 38 | 315999 | OTHER APPAREL ACCESSORIES AND OTHER APPAREL MANUFACTURING | $19,871,877 | 1 |
| 39 | 524292 | PHARMACY BENEFIT MANAGEMENT AND OTHER THIRD PARTY ADMINISTRATION OF INSURANCE AND PENSION FUNDS | $19,866,689 | 3 |
| 40 | 541612 | HUMAN RESOURCES CONSULTING SERVICES (2007), HUMAN RESOURCES AND EXECUTIVE SEARCH CONSULTING SERVICES (2002) | $17,211,550 | 5 |
| 41 | 221118 | OTHER ELECTRIC POWER GENERATION | $16,757,494 | 1 |
| 42 | 541820 | PUBLIC RELATIONS AGENCIES | $16,475,809 | 3 |
| 43 | 511210 | SOFTWARE PUBLISHERS | $15,757,766 | 11 |
| 44 | 512110 | MOTION PICTURE AND VIDEO PRODUCTION | $14,168,335 | 3 |
| 45 | 541618 | OTHER MANAGEMENT CONSULTING SERVICES | $13,775,122 | 4 |
| 46 | 519130 | INTERNET PUBLISHING AND BROADCASTING AND WEB SEARCH PORTALS | $13,648,690 | 11 |
| 47 | 541690 | OTHER SCIENTIFIC AND TECHNICAL CONSULTING SERVICES | $12,859,936 | 8 |
| 48 | 562111 | SOLID WASTE COLLECTION | $10,536,642 | 1 |
| 49 | 492110 | COURIERS AND EXPRESS DELIVERY SERVICES | $10,440,843 | 2 |
| 50 | 621111 | OFFICES OF PHYSICIANS (EXCEPT MENTAL HEALTH SPECIALISTS) | $9,915,802 | 2 |
| 51 | 928120 | INTERNATIONAL AFFAIRS | $9,549,280 | 21 |
| 52 | 423430 | COMPUTER AND COMPUTER PERIPHERAL EQUIPMENT AND SOFTWARE MERCHANT WHOLESALERS | $9,355,389 | 6 |
| 53 | 484210 | USED HOUSEHOLD AND OFFICE GOODS MOVING | $9,051,999 | 2 |
| 54 | 811212 | COMPUTER AND OFFICE MACHINE REPAIR AND MAINTENANCE | $8,205,017 | 4 |
| 55 | 541199 | ALL OTHER LEGAL SERVICES | $7,189,286 | 9 |
| 56 | 621399 | OFFICES OF ALL OTHER MISCELLANEOUS HEALTH PRACTITIONERS | $6,054,361 | 1 |
| 57 | 493110 | GENERAL WAREHOUSING AND STORAGE | $6,017,275 | 2 |
| 58 | 519190 | ALL OTHER INFORMATION SERVICES | $5,992,196 | 4 |
| 59 | 221210 | NATURAL GAS DISTRIBUTION | $4,786,449 | 1 |
| 60 | 561990 | ALL OTHER SUPPORT SERVICES | $4,720,819 | 3 |
| 61 | 481111 | SCHEDULED PASSENGER AIR TRANSPORTATION | $4,365,638 | 2 |
| 62 | 561611 | INVESTIGATION AND PERSONAL BACKGROUND CHECK SERVICES | $4,000,926 | 11 |
| 63 | 541712 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT BIOTECHNOLOGY) | $3,977,787 | 3 |
| 64 | 562910 | REMEDIATION SERVICES | $3,940,002 | 2 |
| 65 | 491110 | POSTAL SERVICE | $3,922,842 | 2 |
| 66 | 561320 | TEMPORARY HELP SERVICES | $3,898,906 | 6 |
| 67 | 541613 | MARKETING CONSULTING SERVICES | $3,831,891 | 1 |
| 68 | 333316 | PHOTOGRAPHIC AND PHOTOCOPYING EQUIPMENT MANUFACTURING | $3,537,131 | 2 |
| 69 | 238210 | ELECTRICAL CONTRACTORS AND OTHER WIRING INSTALLATION CONTRACTORS | $3,485,838 | 3 |
| 70 | 561499 | ALL OTHER BUSINESS SUPPORT SERVICES | $2,788,946 | 2 |
| 71 | 541410 | INTERIOR DESIGN SERVICES | $2,671,915 | 1 |
| 72 | 517410 | SATELLITE TELECOMMUNICATIONS | $2,446,152 | 1 |
| 73 | 541614 | PROCESS, PHYSICAL DISTRIBUTION, AND LOGISTICS CONSULTING SERVICES | $2,406,620 | 2 |
| 74 | 541930 | TRANSLATION AND INTERPRETATION SERVICES | $2,248,995 | 5 |
| 75 | 811213 | COMMUNICATION EQUIPMENT REPAIR AND MAINTENANCE | $1,941,085 | 1 |
| 76 | 812930 | PARKING LOTS AND GARAGES | $1,840,517 | 3 |
| 77 | 517311 | WIRED TELECOMMUNICATIONS CARRIERS | $1,781,844 | 1 |
| 78 | 238220 | PLUMBING, HEATING, AND AIR-CONDITIONING CONTRACTORS | $1,730,866 | 4 |
| 79 | 812990 | ALL OTHER PERSONAL SERVICES | $1,587,456 | 1 |
| 80 | 115310 | SUPPORT ACTIVITIES FOR FORESTRY | $1,559,708 | 1 |
| 81 | 221310 | WATER SUPPLY AND IRRIGATION SYSTEMS | $1,414,271 | 1 |
| 82 | 721110 | HOTELS (EXCEPT CASINO HOTELS) AND MOTELS | $1,364,400 | 1 |
| 83 | 561730 | LANDSCAPING SERVICES | $1,227,826 | 1 |
| 84 | 611710 | EDUCATIONAL SUPPORT SERVICES | $1,190,975 | 1 |
| 85 | 561613 | ARMORED CAR SERVICES | $1,142,935 | 1 |
| 86 | 561492 | COURT REPORTING AND STENOTYPE SERVICES | $1,139,446 | 5 |
| 87 | 485999 | ALL OTHER TRANSIT AND GROUND PASSENGER TRANSPORTATION | $1,042,992 | 1 |
| 88 | 522320 | FINANCIAL TRANSACTIONS PROCESSING, RESERVE, AND CLEARINGHOUSE ACTIVITIES | $1,029,166 | 2 |
| 89 | 334111 | ELECTRONIC COMPUTER MANUFACTURING | $1,005,699 | 5 |
| 90 | 562211 | HAZARDOUS WASTE TREATMENT AND DISPOSAL | $850,740 | 1 |
| 91 | 722310 | FOOD SERVICE CONTRACTORS | $782,235 | 1 |
| 92 | 334290 | OTHER COMMUNICATIONS EQUIPMENT MANUFACTURING | $676,551 | 2 |
| 93 | 811310 | COMMERCIAL AND INDUSTRIAL MACHINERY AND EQUIPMENT (EXCEPT AUTOMOTIVE AND ELECTRONIC) REPAIR AND MAINTENANCE | $536,415 | 1 |
| 94 | 493190 | OTHER WAREHOUSING AND STORAGE | $430,403 | 1 |
| 95 | 541350 | BUILDING INSPECTION SERVICES | $248,463 | 1 |
| 96 | 512199 | OTHER MOTION PICTURE AND VIDEO INDUSTRIES | $237,500 | 1 |
| 97 | 334512 | AUTOMATIC ENVIRONMENTAL CONTROL MANUFACTURING FOR RESIDENTIAL, COMMERCIAL, AND APPLIANCE USE | $223,525 | 2 |
| 98 | 334516 | ANALYTICAL LABORATORY INSTRUMENT MANUFACTURING | $201,928 | 2 |
| 99 | 334519 | OTHER MEASURING AND CONTROLLING DEVICE MANUFACTURING | $186,974 | 2 |
| 100 | 621999 | ALL OTHER MISCELLANEOUS AMBULATORY HEALTH CARE SERVICES | $161,657 | 1 |