| Rank |
Company |
2012 Office Revenue ($) |
| 1 |
AECOM Technology Corp. |
$830,320,000 |
| 2 |
Parsons Brinckerhoff |
$146,400,000 |
| 3 |
Jacobs Engineering Group |
$95,180,000 |
| 4 |
Burns & McDonnell |
$82,020,000 |
| 5 |
Thornton Tomasetti |
$50,861,467 |
| 6 |
Michael Baker Jr. |
$50,720,000 |
| 7 |
WSP USA |
$48,500,162 |
| 8 |
Arup |
$32,355,607 |
| 9 |
Buro Happold Consulting Engineers |
$28,720,000 |
| 10 |
AKF Group |
$26,917,000 |
| 11 |
Allen & Shariff |
$23,000,000 |
| 12 |
Syska Hennessy Group |
$22,537,724 |
| 13 |
URS Corp. |
$22,004,616 |
| 14 |
Environmental Systems Design |
$19,528,391 |
| 15 |
Science Applications International Corp. |
$18,346,871 |
| 16 |
Dewberry |
$16,371,636 |
| 17 |
Wiss, Janney, Elstner Associates |
$13,850,000 |
| 18 |
GHT Limited |
$12,944,469 |
| 19 |
Glumac |
$12,535,000 |
| 20 |
Haynes Whaley Associates |
$10,928,961 |
| 21 |
Magnusson Klemencic Associates |
$10,597,664 |
| 22 |
Vanderweil Engineers |
$10,485,700 |
| 23 |
KPFF Consulting Engineers |
$10,000,000 |
| 24 |
BRPH |
$9,800,000 |
| 25 |
RDK Engineers |
$9,578,000 |
| 26 |
Simpson Gumpertz & Heger |
$8,500,000 |
| 27 |
Clark Nexsen |
$6,169,304 |
| 28 |
Rolf Jensen & Associates |
$6,000,000 |
| 29 |
H.F. Lenz |
$5,357,000 |
| 30 |
H&A Architects & Engineers |
$5,239,486 |
| 31 |
Joseph R. Loring & Associates |
$5,150,000 |
| 32 |
Bridgers & Paxton Consulting Engineers |
$4,807,632 |
| 33 |
ThermalTech Engineering |
$3,800,000 |
| 34 |
CJL Engineering |
$3,521,065 |
| 35 |
Smith Seckman Reid |
$3,508,905 |
| 36 |
STV |
$3,505,000 |
| 37 |
SSOE Group |
$3,380,239 |
| 38 |
Newcomb & Boyd |
$3,371,710 |
| 39 |
Heapy Engineering |
$3,362,333 |
| 40 |
Sparling |
$3,275,463 |
| 41 |
TTG |
$3,203,930 |
| 42 |
Bala Consulting Engineers |
$3,160,000 |
| 43 |
Walker Parking Consultants |
$3,109,222 |
| 44 |
M-E Engineers |
$3,100,000 |
| 45 |
Henderson Engineers |
$3,014,367 |
| 46 |
Hixson Architecture, Engineering, Interiors |
$3,000,000 |
| 47 |
TLC Engineering for Architecture |
$2,991,691 |
| 48 |
Interface Engineering |
$2,962,807 |
| 49 |
Coffman Engineers |
$2,825,000 |
| 50 |
Walter P Moore |
$2,681,402 |
| 51 |
KLH Engineers |
$2,600,000 |
| 52 |
KJWW Engineering Consultants |
$2,352,444 |
| 53 |
Karpinski Engineering |
$2,179,216 |
| 54 |
Aon Fire Protection Engineering |
$2,000,000 |
| 55 |
Primera Engineers |
$1,998,000 |
| 56 |
Affiliated Engineers |
$1,968,000 |
| 57 |
Dunham Associates |
$1,750,000 |
| 58 |
Spectrum Engineers |
$1,745,854 |
| 59 |
Peter Basso Associates |
$1,700,000 |
| 60 |
GRAEF |
$1,572,073 |
| 61 |
CTLGroup |
$1,500,000 |
| 61 |
Middough |
$1,500,000 |
| 61 |
Paulus, Sokolowski and Sartor |
$1,500,000 |
| 64 |
Degenkolb Engineers |
$1,497,172 |
| 65 |
Shive-Hattery |
$1,480,615 |
| 66 |
Wick Fisher White |
$1,462,851 |
| 67 |
French & Parrello Associates |
$1,400,000 |
| 68 |
Brinjac Engineering |
$1,199,912 |
| 69 |
Zak Companies |
$1,151,229 |
| 70 |
M/E Engineering |
$1,134,350 |
| 71 |
KCI Technologies |
$1,000,000 |
| 71 |
OLA Consulting Engineers |
$1,000,000 |
| 73 |
Kamm Consulting |
$947,456 |
| 74 |
Mazzetti |
$945,119 |
| 75 |
Bergmann Associates |
$921,000 |
| 76 |
Bard, Rao + Athanas Consulting Engineers |
$900,000 |
| 77 |
Wallace Engineering |
$825,000 |
| 78 |
CCRD Partners |
$700,000 |
| 79 |
Eaton Energy Solutions |
$613,024 |
| 80 |
GRW |
$542,150 |
| 81 |
G&W Engineering |
$450,000 |
| 82 |
P2S Engineering |
$383,806 |
| 83 |
Davis, Bowen & Friedel |
$284,349 |
| 84 |
Guernsey |
$241,535 |
| 85 |
Ross & Baruzzini |
$225,000 |
| 86 |
RMF Engineering Design |
$75,000 |
| 87 |
Apogee Consulting Group |
$59,000 |
| 88 |
Total Building Commissioning |
$43,810 |
| 89 |
Stanley Consultants |
$10,107 |
| 90 |
FBA Engineering |
$10,000 |