TOP 55 ENGINEERING COMPANIES |
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| Rank | Firm | 2015 Revenue |
| 1 | WSP | Parsons Brinckerhoff | $507,779,000 |
| 2 | Fluor Corp. | $234,170,000 |
| 3 | Arup | $170,601,562 |
| 4 | Jensen Hughes | $126,307,878 |
| 5 | KJWW / TTG | $121,000,000 |
| 6 | Vanderweil Engineers | $110,028,000 |
| 7 | Syska Hennessy Group | $99,432,587 |
| 8 | Henderson Engineers | $94,551,747 |
| 9 | Simpson Gumpertz & Heger | $83,125,000 |
| 10 | Walter P Moore | $72,264,662 |
| 11 | BR+A Consulting Engineers | $61,000,000 |
| 12 | Smith Seckman Reid | $59,586,203 |
| 13 | Environmental Systems Design | $52,394,670 |
| 14 | ME Engineers | $51,400,000 |
| 15 | Magnusson Klemencic Associates | $49,483,828 |
| 16 | TLC Engineering for Architecture | $47,855,690 |
| 17 | Glumac | $47,014,670 |
| 18 | DeSimone Consulting Engineers | $44,112,915 |
| 19 | Mazzetti | $37,140,683 |
| 20 | Coffman Engineers | $35,436,712 |
| 21 | Interface Engineering | $34,242,040 |
| 22 | RDK Engineers | $31,646,583 |
| 23 | I. C. Thomasson Associates | $31,100,000 |
| 24 | JBA Consulting Engineers | $29,307,908 |
| 25 | ThermalTech Engineering | $28,900,000 |
| 26 | Heapy Engineering | $26,580,153 |
| 27 | Newcomb & Boyd | $24,172,156 |
| 28 | Bala Consulting Engineers | $23,500,000 |
| 29 | M/E Engineering | $23,442,000 |
| 30 | H.F. Lenz Company | $23,283,392 |
| 31 | Loring Consulting Engineers | $23,000,000 |
| 32 | Dunham Associates | $22,050,000 |
| 33 | P2S Engineering | $20,318,446 |
| 34 | Bridgers & Paxton Consulting Engineers | $19,475,834 |
| 35 | KLH Engineers | $17,838,026 |
| 36 | Robins & Morton | $17,540,000 |
| 37 | Cardno Haynes Whaley | $17,284,271 |
| 38 | Wallace Engineering | $17,000,000 |
| 39 | Spectrum Engineers | $15,596,896 |
| 40 | Karpinski Engineering | $14,448,500 |
| 41 | CJL Engineering, Inc. | $14,261,252 |
| 42 | Peter Basso Associates | $14,005,342 |
| 43 | Global Engineering Solutions | $13,100,000 |
| 44 | GHT Limited | $12,810,000 |
| 45 | Allen & Shariff Corp. | $11,052,241 |
| 46 | JQ Engineering | $10,632,000 |
| 47 | Zak Companies | $8,915,552 |
| 48 | Baird, Hampton & Brown | $8,591,793 |
| 49 | Wick Fisher White | $7,777,200 |
| 50 | dbHMS | $7,680,000 |
| 51 | OLA Consulting Engineers | $6,872,851 |
| 52 | Kamm Consulting | $6,600,763 |
| 53 | William Tao & Associates | $6,307,788 |
| 54 | Leidos | $5,707,000 |
| 55 | G & W Engineering Corp. | $5,001,286 |
| 56 | Architectural Engineers | $3,235,745 |
| 57 | KCL Engineering | $2,570,959 |
| 58 | Yates Companies, The | $300,000 |
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