| 1 | 562910 | REMEDIATION SERVICES | $4,465,438,521 | 1 |
| 2 | 561210 | FACILITIES SUPPORT SERVICES | $510,382,445 | 5 |
| 3 | 541715 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT NANOTECHNOLOGY AND BIOTECHNOLOGY) | $390,887,045 | 6 |
| 4 | 541690 | OTHER SCIENTIFIC AND TECHNICAL CONSULTING SERVICES | $215,115,573 | 3 |
| 5 | 221121 | ELECTRIC BULK POWER TRANSMISSION AND CONTROL | $200,023,017 | 1 |
| 6 | 236220 | COMMERCIAL AND INSTITUTIONAL BUILDING CONSTRUCTION | $129,368,555 | 5 |
| 7 | 611519 | OTHER TECHNICAL AND TRADE SCHOOLS | $76,648,919 | 3 |
| 8 | 541512 | COMPUTER SYSTEMS DESIGN SERVICES | $64,319,549 | 2 |
| 9 | 541330 | ENGINEERING SERVICES | $51,800,199 | 19 |
| 10 | 561612 | SECURITY GUARDS AND PATROL SERVICES | $41,987,785 | 2 |
| 11 | 811219 | OTHER ELECTRONIC AND PRECISION EQUIPMENT REPAIR AND MAINTENANCE | $40,757,168 | 6 |
| 12 | 611699 | ALL OTHER MISCELLANEOUS SCHOOLS AND INSTRUCTION | $24,744,504 | 1 |
| 13 | 622110 | GENERAL MEDICAL AND SURGICAL HOSPITALS | $23,307,780 | 1 |
| 14 | 541711 | RESEARCH AND DEVELOPMENT IN BIOTECHNOLOGY | $20,416,704 | 4 |
| 15 | 561720 | JANITORIAL SERVICES | $15,869,521 | 2 |
| 16 | 621991 | BLOOD AND ORGAN BANKS | $14,606,817 | 2 |
| 17 | 541620 | ENVIRONMENTAL CONSULTING SERVICES | $13,907,761 | 4 |
| 18 | 541713 | RESEARCH AND DEVELOPMENT IN NANOTECHNOLOGY | $9,328,397 | 1 |
| 19 | 238210 | ELECTRICAL CONTRACTORS AND OTHER WIRING INSTALLATION CONTRACTORS | $9,108,369 | 1 |
| 20 | 541712 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT BIOTECHNOLOGY) | $8,631,268 | 2 |
| 21 | 511210 | SOFTWARE PUBLISHERS | $7,222,988 | 3 |
| 22 | 333999 | ALL OTHER MISCELLANEOUS GENERAL PURPOSE MACHINERY MANUFACTURING | $7,217,740 | 2 |
| 23 | 541380 | TESTING LABORATORIES AND SERVICES | $5,933,017 | 6 |
| 24 | 221118 | OTHER ELECTRIC POWER GENERATION | $5,706,443 | 1 |
| 25 | 541519 | OTHER COMPUTER RELATED SERVICES | $4,788,889 | 13 |
| 26 | 518210 | DATA PROCESSING, HOSTING, AND RELATED SERVICES | $2,920,763 | 1 |
| 27 | 541611 | ADMINISTRATIVE MANAGEMENT AND GENERAL MANAGEMENT CONSULTING SERVICES | $2,414,276 | 4 |
| 28 | 511120 | PERIODICAL PUBLISHERS | $2,212,975 | 1 |
| 29 | 541310 | ARCHITECTURAL SERVICES | $2,113,380 | 4 |
| 30 | 325120 | INDUSTRIAL GAS MANUFACTURING | $1,495,934 | 1 |
| 31 | 611430 | PROFESSIONAL AND MANAGEMENT DEVELOPMENT TRAINING | $1,426,357 | 1 |
| 32 | 334220 | RADIO AND TELEVISION BROADCASTING AND WIRELESS COMMUNICATIONS EQUIPMENT MANUFACTURING | $1,329,000 | 1 |
| 33 | 722310 | FOOD SERVICE CONTRACTORS | $1,160,790 | 1 |
| 34 | 532210 | CONSUMER ELECTRONICS AND APPLIANCES RENTAL | $1,005,269 | 1 |
| 35 | 336211 | MOTOR VEHICLE BODY MANUFACTURING | $884,686 | 2 |
| 36 | 334516 | ANALYTICAL LABORATORY INSTRUMENT MANUFACTURING | $659,101 | 6 |
| 37 | 238990 | ALL OTHER SPECIALTY TRADE CONTRACTORS | $628,415 | 2 |
| 38 | 517311 | WIRED TELECOMMUNICATIONS CARRIERS | $604,928 | 3 |
| 39 | 334111 | ELECTRONIC COMPUTER MANUFACTURING | $554,164 | 5 |
| 40 | 621399 | OFFICES OF ALL OTHER MISCELLANEOUS HEALTH PRACTITIONERS | $484,540 | 1 |
| 41 | 541990 | ALL OTHER PROFESSIONAL, SCIENTIFIC, AND TECHNICAL SERVICES | $402,420 | 2 |
| 42 | 336413 | OTHER AIRCRAFT PARTS AND AUXILIARY EQUIPMENT MANUFACTURING | $356,871 | 1 |
| 43 | 324110 | PETROLEUM REFINERIES | $235,843 | 1 |
| 44 | 443120 | COMPUTER AND SOFTWARE STORES | $159,568 | 1 |
| 45 | 332911 | INDUSTRIAL VALVE MANUFACTURING | $146,038 | 2 |
| 46 | 334519 | OTHER MEASURING AND CONTROLLING DEVICE MANUFACTURING | $144,838 | 1 |
| 47 | 541110 | OFFICES OF LAWYERS | $137,000 | 3 |
| 48 | 339112 | SURGICAL AND MEDICAL INSTRUMENT MANUFACTURING | $129,422 | 1 |
| 49 | 561621 | SECURITY SYSTEMS SERVICES (EXCEPT LOCKSMITHS) | $124,729 | 3 |
| 50 | 334511 | SEARCH, DETECTION, NAVIGATION, GUIDANCE, AERONAUTICAL, AND NAUTICAL SYSTEM AND INSTRUMENT MANUFACTURING | $116,790 | 1 |
| 51 | 519120 | LIBRARIES AND ARCHIVES | $114,297 | 2 |
| 52 | 325412 | PHARMACEUTICAL PREPARATION MANUFACTURING | $73,450 | 2 |
| 53 | 561611 | INVESTIGATION AND PERSONAL BACKGROUND CHECK SERVICES | $40,417 | 1 |
| 54 | 333315 | PHOTOGRAPHIC AND PHOTOCOPYING EQUIPMENT MANUFACTURING | $30,179 | 2 |
| 55 | 238220 | PLUMBING, HEATING, AND AIR-CONDITIONING CONTRACTORS | $29,895 | 1 |
| 56 | 811412 | APPLIANCE REPAIR AND MAINTENANCE | $29,139 | 1 |
| 57 | 334513 | INSTRUMENTS AND RELATED PRODUCTS MANUFACTURING FOR MEASURING, DISPLAYING, AND CONTROLLING INDUSTRIAL PROCESS VARIABLES | $23,250 | 1 |
| 58 | 333924 | INDUSTRIAL TRUCK, TRACTOR, TRAILER, AND STACKER MACHINERY MANUFACTURING | $20,415 | 1 |
| 59 | 237110 | WATER AND SEWER LINE AND RELATED STRUCTURES CONSTRUCTION | $19,847 | 1 |
| 60 | 336412 | AIRCRAFT ENGINE AND ENGINE PARTS MANUFACTURING | $15,321 | 1 |
| 61 | 541191 | TITLE ABSTRACT AND SETTLEMENT OFFICES | $15,300 | 1 |
| 62 | 339113 | SURGICAL APPLIANCE AND SUPPLIES MANUFACTURING | $14,946 | 1 |
| 63 | 236118 | RESIDENTIAL REMODELERS | $11,715 | 1 |
| 64 | 333249 | OTHER INDUSTRIAL MACHINERY MANUFACTURING | $11,598 | 1 |
| 65 | 561492 | COURT REPORTING AND STENOTYPE SERVICES | $10,226 | 2 |
| 66 | 423450 | MEDICAL, DENTAL, AND HOSPITAL EQUIPMENT AND SUPPLIES MERCHANT WHOLESALERS | $8,500 | 2 |
| 67 | 921190 | OTHER GENERAL GOVERNMENT SUPPORT | $3,800 | 1 |
| 68 | 562111 | SOLID WASTE COLLECTION | $1,103 | 1 |
| 69 | 335999 | ALL OTHER MISCELLANEOUS ELECTRICAL EQUIPMENT AND COMPONENT MANUFACTURING | $1,038 | 1 |