| TOP 50 SCIENCE + TECHNOLOGY ENGINEERING FIRMS | ||
| Rank | Firm | 2015 Revenue |
| 1 | Jacobs | $51,420,000 |
| 2 | Affiliated Engineers | $29,447,000 |
| 3 | Vanderweil Engineers | $21,653,900 |
| 4 | CRB | $10,200,000 |
| 5 | RMF Engineering | $6,285,000 |
| 6 | Mazzetti | $5,199,075 |
| 7 | Thornton Tomasetti | $4,686,534 |
| 8 | Newcomb & Boyd | $3,466,430 |
| 9 | Rist-Frost-Shumway Engineering | $3,335,000 |
| 10 | Global Engineering Solutions | $3,275,000 |
| 11 | BR+A Consulting Engineers | $3,000,000 |
| 12 | Arup | $2,352,966 |
| 13 | Ghafari Associates | $2,000,000 |
| 14 | BSA LifeStructures | $1,969,607 |
| 15 | Syska Hennessy Group | $1,750,876 |
| 16 | Bridgers & Paxton Consulting Engineers | $1,667,247 |
| 17 | Environmental Systems Design | $1,571,840 |
| 18 | Jensen Hughes | $1,555,972 |
| 19 | STV | $1,378,299 |
| 20 | KJWW / TTG | $1,365,000 |
| 21 | RDK Engineers | $1,323,231 |
| 22 | Spectrum Engineers | $1,288,746 |
| 23 | Ross & Baruzzini | $1,284,549 |
| 24 | ThermalTech Engineering | $1,250,000 |
| 25 | Hankins and Anderson | $1,230,980 |
| 26 | Karpinski Engineering | $1,100,000 |
| 27 | Sherlock, Smith & Adams | $1,014,000 |
| 28 | ME Engineers | $1,000,000 |
| 29 | Cardno Haynes Whaley | $820,511 |
| 30 | Pedco E & A Services | $765,000 |
| 31 | Coffman Engineers | $698,634 |
| 32 | I. C. Thomasson Associates | $622,000 |
| 33 | Smith Seckman Reid | $511,913 |
| 34 | P2S Engineering | $504,514 |
| 35 | Glumac | $494,360 |
| 36 | Peter Basso Associates | $474,636 |
| 37 | Bala Consulting Engineers | $450,000 |
| 38 | SSOE Group | $390,000 |
| 39 | dbHMS | $384,000 |
| 40 | Henderson Engineers | $326,842 |
| 41 | William Tao & Associates | $315,389 |
| 42 | Walter P Moore | $315,202 |
| 43 | Stanley Consultants | $290,773 |
| 44 | Highland Associates | $220,000 |
| 45 | KZF Design | $216,000 |
| 46 | JBA Consulting Engineers | $131,855 |
| 47 | H.F. Lenz Company | $131,000 |
| 48 | Wiss, Janney, Elstner Associates | $100,000 |
| 49 | CTLGroup | $100,000 |
| 50 | Architectural Engineers | $79,964 |
| 51 | G & W Engineering Corp. | $50,013 |
| 52 | Dunham Associates | $50,000 |
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