| 1 | 541330 | ENGINEERING SERVICES | $2,678,984,253 | 102 |
| 2 | 541710 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES | $2,289,221,497 | 6 |
| 3 | 541715 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT NANOTECHNOLOGY AND BIOTECHNOLOGY) | $2,269,588,348 | 33 |
| 4 | 541519 | OTHER COMPUTER RELATED SERVICES | $1,569,151,017 | 227 |
| 5 | 541712 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT BIOTECHNOLOGY) | $1,232,737,267 | 20 |
| 6 | 518210 | DATA PROCESSING, HOSTING, AND RELATED SERVICES | $1,190,395,612 | 37 |
| 7 | 541512 | COMPUTER SYSTEMS DESIGN SERVICES | $761,684,347 | 42 |
| 8 | 561110 | OFFICE ADMINISTRATIVE SERVICES | $432,202,432 | 12 |
| 9 | 541611 | ADMINISTRATIVE MANAGEMENT AND GENERAL MANAGEMENT CONSULTING SERVICES | $430,938,354 | 53 |
| 10 | 541720 | RESEARCH AND DEVELOPMENT IN THE SOCIAL SCIENCES AND HUMANITIES | $345,271,202 | 32 |
| 11 | 221310 | WATER SUPPLY AND IRRIGATION SYSTEMS | $343,016,059 | 2 |
| 12 | 517110 | WIRED TELECOMMUNICATIONS CARRIERS | $296,911,993 | 5 |
| 13 | 541511 | CUSTOM COMPUTER PROGRAMMING SERVICES | $260,675,616 | 26 |
| 14 | 621111 | OFFICES OF PHYSICIANS (EXCEPT MENTAL HEALTH SPECIALISTS) | $219,060,966 | 5 |
| 15 | 221122 | ELECTRIC POWER DISTRIBUTION | $181,693,520 | 3 |
| 16 | 541713 | RESEARCH AND DEVELOPMENT IN NANOTECHNOLOGY | $175,370,644 | 1 |
| 17 | 334220 | RADIO AND TELEVISION BROADCASTING AND WIRELESS COMMUNICATIONS EQUIPMENT MANUFACTURING | $147,683,690 | 2 |
| 18 | 561210 | FACILITIES SUPPORT SERVICES | $136,401,581 | 21 |
| 19 | 541990 | ALL OTHER PROFESSIONAL, SCIENTIFIC, AND TECHNICAL SERVICES | $71,179,980 | 49 |
| 20 | 236220 | COMMERCIAL AND INSTITUTIONAL BUILDING CONSTRUCTION | $70,619,946 | 9 |
| 21 | 334511 | SEARCH, DETECTION, NAVIGATION, GUIDANCE, AERONAUTICAL, AND NAUTICAL SYSTEM AND INSTRUMENT MANUFACTURING | $69,856,447 | 1 |
| 22 | 541513 | COMPUTER FACILITIES MANAGEMENT SERVICES | $68,914,153 | 2 |
| 23 | 517919 | ALL OTHER TELECOMMUNICATIONS | $66,785,172 | 3 |
| 24 | 541612 | HUMAN RESOURCES CONSULTING SERVICES (2007), HUMAN RESOURCES AND EXECUTIVE SEARCH CONSULTING SERVICES (2002) | $47,043,068 | 3 |
| 25 | 541219 | OTHER ACCOUNTING SERVICES | $38,061,779 | 5 |
| 26 | 713940 | FITNESS AND RECREATIONAL SPORTS CENTERS | $31,780,675 | 3 |
| 27 | 621399 | OFFICES OF ALL OTHER MISCELLANEOUS HEALTH PRACTITIONERS | $30,407,366 | 1 |
| 28 | 541620 | ENVIRONMENTAL CONSULTING SERVICES | $19,909,219 | 4 |
| 29 | 221330 | STEAM AND AIR-CONDITIONING SUPPLY | $17,365,513 | 1 |
| 30 | 561720 | JANITORIAL SERVICES | $17,281,417 | 3 |
| 31 | 621999 | ALL OTHER MISCELLANEOUS AMBULATORY HEALTH CARE SERVICES | $16,045,741 | 2 |
| 32 | 541810 | ADVERTISING AGENCIES | $14,323,030 | 4 |
| 33 | 813319 | OTHER SOCIAL ADVOCACY ORGANIZATIONS | $13,577,589 | 1 |
| 34 | 238210 | ELECTRICAL CONTRACTORS AND OTHER WIRING INSTALLATION CONTRACTORS | $13,516,557 | 1 |
| 35 | 541614 | PROCESS, PHYSICAL DISTRIBUTION, AND LOGISTICS CONSULTING SERVICES | $12,660,922 | 3 |
| 36 | 541110 | OFFICES OF LAWYERS | $12,658,582 | 3 |
| 37 | 511210 | SOFTWARE PUBLISHERS | $12,517,205 | 11 |
| 38 | 923120 | ADMINISTRATION OF PUBLIC HEALTH PROGRAMS | $12,510,111 | 7 |
| 39 | 561499 | ALL OTHER BUSINESS SUPPORT SERVICES | $12,167,731 | 3 |
| 40 | 561320 | TEMPORARY HELP SERVICES | $12,069,582 | 17 |
| 41 | 315999 | OTHER APPAREL ACCESSORIES AND OTHER APPAREL MANUFACTURING | $10,474,752 | 2 |
| 42 | 517312 | WIRELESS TELECOMMUNICATIONS CARRIERS (EXCEPT SATELLITE) | $9,850,615 | 1 |
| 43 | 221210 | NATURAL GAS DISTRIBUTION | $9,638,114 | 2 |
| 44 | 541930 | TRANSLATION AND INTERPRETATION SERVICES | $7,908,816 | 8 |
| 45 | 333244 | PRINTING MACHINERY AND EQUIPMENT MANUFACTURING | $7,148,929 | 1 |
| 46 | 541310 | ARCHITECTURAL SERVICES | $6,548,256 | 5 |
| 47 | 541940 | VETERINARY SERVICES | $6,082,482 | 2 |
| 48 | 443120 | COMPUTER AND SOFTWARE STORES | $5,900,529 | 4 |
| 49 | 484210 | USED HOUSEHOLD AND OFFICE GOODS MOVING | $5,662,577 | 1 |
| 50 | 541211 | OFFICES OF CERTIFIED PUBLIC ACCOUNTANTS | $4,626,328 | 3 |
| 51 | 561612 | SECURITY GUARDS AND PATROL SERVICES | $4,422,295 | 1 |
| 52 | 611430 | PROFESSIONAL AND MANAGEMENT DEVELOPMENT TRAINING | $3,661,268 | 7 |
| 53 | 811219 | OTHER ELECTRONIC AND PRECISION EQUIPMENT REPAIR AND MAINTENANCE | $3,171,570 | 25 |
| 54 | 611110 | ELEMENTARY AND SECONDARY SCHOOLS | $2,631,167 | 1 |
| 55 | 523930 | INVESTMENT ADVICE | $2,573,644 | 1 |
| 56 | 561410 | DOCUMENT PREPARATION SERVICES | $2,286,026 | 1 |
| 57 | 334111 | ELECTRONIC COMPUTER MANUFACTURING | $2,254,892 | 6 |
| 58 | 561990 | ALL OTHER SUPPORT SERVICES | $2,161,684 | 2 |
| 59 | 541690 | OTHER SCIENTIFIC AND TECHNICAL CONSULTING SERVICES | $1,822,877 | 5 |
| 60 | 238220 | PLUMBING, HEATING, AND AIR-CONDITIONING CONTRACTORS | $1,592,242 | 3 |
| 61 | 315220 | MEN'S AND BOYS' CUT AND SEW APPAREL MANUFACTURING | $1,485,000 | 1 |
| 62 | 523999 | MISCELLANEOUS FINANCIAL INVESTMENT ACTIVITIES | $1,391,603 | 1 |
| 63 | 493110 | GENERAL WAREHOUSING AND STORAGE | $1,261,235 | 2 |
| 64 | 561611 | INVESTIGATION AND PERSONAL BACKGROUND CHECK SERVICES | $1,062,582 | 3 |
| 65 | 337215 | SHOWCASE, PARTITION, SHELVING, AND LOCKER MANUFACTURING | $1,056,432 | 2 |
| 66 | 339112 | SURGICAL AND MEDICAL INSTRUMENT MANUFACTURING | $1,024,659 | 16 |
| 67 | 325414 | BIOLOGICAL PRODUCT (EXCEPT DIAGNOSTIC) MANUFACTURING | $825,113 | 4 |
| 68 | 424210 | DRUGS AND DRUGGISTS' SUNDRIES MERCHANT WHOLESALERS | $818,872 | 1 |
| 69 | 611310 | COLLEGES, UNIVERSITIES, AND PROFESSIONAL SCHOOLS | $793,947 | 3 |
| 70 | 485320 | LIMOUSINE SERVICE | $775,255 | 1 |
| 71 | 519120 | LIBRARIES AND ARCHIVES | $738,932 | 1 |
| 72 | 541380 | TESTING LABORATORIES AND SERVICES | $738,656 | 4 |
| 73 | 333315 | PHOTOGRAPHIC AND PHOTOCOPYING EQUIPMENT MANUFACTURING | $638,735 | 1 |
| 74 | 811212 | COMPUTER AND OFFICE MACHINE REPAIR AND MAINTENANCE | $624,867 | 3 |
| 75 | 334516 | ANALYTICAL LABORATORY INSTRUMENT MANUFACTURING | $564,235 | 11 |
| 76 | 622110 | GENERAL MEDICAL AND SURGICAL HOSPITALS | $504,617 | 1 |
| 77 | 339113 | SURGICAL APPLIANCE AND SUPPLIES MANUFACTURING | $489,082 | 6 |
| 78 | 515210 | CABLE AND OTHER SUBSCRIPTION PROGRAMMING | $482,108 | 1 |
| 79 | 333298 | ALL OTHER INDUSTRIAL MACHINERY MANUFACTURING | $477,756 | 1 |
| 80 | 518111 | INTERNET SERVICE PROVIDERS | $404,297 | 2 |
| 81 | 611710 | EDUCATIONAL SUPPORT SERVICES | $387,220 | 3 |
| 82 | 321991 | MANUFACTURED HOME (MOBILE HOME) MANUFACTURING | $348,240 | 1 |
| 83 | 562111 | SOLID WASTE COLLECTION | $283,174 | 1 |
| 84 | 511199 | ALL OTHER PUBLISHERS | $249,041 | 1 |
| 85 | 541711 | RESEARCH AND DEVELOPMENT IN BIOTECHNOLOGY | $245,263 | 2 |
| 86 | 541410 | INTERIOR DESIGN SERVICES | $236,369 | 1 |
| 87 | 561621 | SECURITY SYSTEMS SERVICES (EXCEPT LOCKSMITHS) | $235,858 | 2 |
| 88 | 722310 | FOOD SERVICE CONTRACTORS | $225,712 | 1 |
| 89 | 541618 | OTHER MANAGEMENT CONSULTING SERVICES | $225,156 | 1 |
| 90 | 337122 | NONUPHOLSTERED WOOD HOUSEHOLD FURNITURE MANUFACTURING | $221,036 | 5 |
| 91 | 812332 | INDUSTRIAL LAUNDERERS | $219,287 | 1 |
| 92 | 511110 | NEWSPAPER PUBLISHERS | $187,515 | 1 |
| 93 | 454310 | FUEL DEALERS | $171,688 | 1 |
| 94 | 339944 | CARBON PAPER AND INKED RIBBON MANUFACTURING | $164,649 | 1 |
| 95 | 492110 | COURIERS AND EXPRESS DELIVERY SERVICES | $145,032 | 1 |
| 96 | 339116 | DENTAL LABORATORIES | $139,870 | 1 |
| 97 | 532490 | OTHER COMMERCIAL AND INDUSTRIAL MACHINERY AND EQUIPMENT RENTAL AND LEASING | $139,223 | 1 |
| 98 | 325120 | INDUSTRIAL GAS MANUFACTURING | $136,389 | 2 |
| 99 | 336112 | LIGHT TRUCK AND UTILITY VEHICLE MANUFACTURING | $121,232 | 1 |
| 100 | 333924 | INDUSTRIAL TRUCK, TRACTOR, TRAILER, AND STACKER MACHINERY MANUFACTURING | $111,110 | 1 |