Every October since 2000, ZweigWhite has recognized the most successful architecture, engineering, and environmental consulting firms with The Zweig Letter Hot Firm List. Over the years, the "Hot Firm" designation has become synonymous with success in the industry.

The Zweig Letter Hot Firm List recognizes both small firms and large firms for their successes. Firms are compared by their change in revenue and earnings over the trailing three years in terms of real dollars and percentage change. The firms with the best combined scores are the winners on The Zweig Letter Hot Firm List.

The Zweig Letter Hot Firm List winners and honorable mentions for 2010 appear below. The winning firms will be honored at a special award ceremony during The Zweig Letter Hot Firm 2010 Conference and Celebration, Oct. 27-28, 2010 at the Gaylord National Resort & Convention Center in Washington, DC.

1. Fentress Architects
2. GENIVAR
3. Trow Global
4. Paul C. Rizzo Associates, Inc.
5. Sovereign Consulting Inc.
6. Hankins and Anderson, Inc. / Bridgefarmer & Associates, Inc. (tie)
7. URS Corporation
8. Mead & Hunt, Inc.
9. Tectonic Engineering & Surveying Consultants P.C.
10. Hill International, Inc.
11. AK Environmental, LLC
12. Jacobs Associates
13. AECOM Technology Corporation
14. Cobb Engineering Company
15. Fluor Corporation
16. Clark Nexsen
17. Luchs Consulting Engineers, LLC.
18. Versar Inc.
19. Structural Integrity Associates, Inc.
20. HAKS Engineers, Architects and Land Surveyors, P.C.
21. Faithful+Gould
22. WSP Group (USA)
23. Klohn Crippen Berger Ltd.
24. Merrick & Company
25. Bioengineering Group
26. Jacobs Engineering Group
27. King + King Architects
28. GUNDA CORPORATION, LLC
29. Tetra Tech, Inc.
30. Stantec Inc.
31. ENTRIX, Inc.
32. Exponent, Inc.
33. M/E Engineering,PC
34. KBR, Inc.
35. TEAM Integrated Engineering, Inc.
36. ENGlobal Corporation
37. E M C ENGINEERS, INC.
38. Garver Engineers
39. Van Boerum & Frank Associates, Inc.
40. Foster Wheeler, Ltd
41. RW Armstrong
42. The Cadmus Group, Inc.
43. Cornerstone Environmental Group
44. Arrington Watkins Architects, LLC
45. M.E. GROUP, INC.
46. Larson Design Group, Inc.
47. GATE, LLC
48. KSA Engineers, Inc.
49. GSI Water Solutions
50. Berger Devine Yaeger, Inc.
51. Dennis Corporation
52. Ecology and Environment
53. Harrison French & Associates, LTD
54. J.L. Patterson & Associates, Inc.
55. Houston Engineering Inc.
56. M+W U.S., Inc. - A Company of the M+W Group
57. J. M. Waller Associates, Inc.
58. Degenkolb Engineers
59. EMCOR Group, Inc.
60. Woodard & Curran
61. Barton & Loguidice, P.C.
62. Walker Partners, LLC
63. TRC Companies
64. Marstel-Day, LLC
65. Apex Companies, LLC
66. GDS Associates, Inc.
67. HSA Engineers & Scientists
68. Mabbett & Associates, Inc.
69. GEO Consultants, LLC
70. gkkworks
71. Gafcon Inc.
72. Weston & Sampson
73. GEI Consultants, Inc.
74. Trihydro Corporation
75. Shive-Hattery, Inc.
76. Passero Associates
77. WB Engineers
78. Shannon & Wilson, Inc.
79. Smolen Emr Ilkovitch Architects, Inc
80. ARM Group Inc.
81. Huckabee
82. Horizon Engineering Associates, LLP
83. David Ford
84. Hargrove Engineer + Constructors
85. Howard R. Green Company (HR Green)
86. Omega & Associates, Inc.
87. 3tarchitects
88. Wier & Associates, Inc.
89. JLG Architects
90. McDonough Bolyard Peck, Inc.
91. EYP Architecture & Engineering
92. WILSON ASSOCIATES
93. Pettigrew & Associates, P.A.
94. Greenman-Pedersen, Inc.
95. MTE Consultants Inc.
96. Westhorp & Associates, Inc.
97. YU & Associates, Inc
98. Bartlett & West, Inc.
99. BCI Engineers & Scientists, Inc.
100. Finley Engineering Company, Inc
101. Wisnewski Blair & Associates, Ltd.
102. Watermark
103. PK Electrical, Inc.
104. Albert Grover & Associates
105. Shea Carr Jewell
106. Allana Buick & Bers, Inc.
107. Lewis S. Goodfriend & Associates
108. Collins Engineers, Inc.
109. BENNETT WAGNER & GRODY ARCHITECTS
110. The Gateway Engineers, Inc.
111. ACAI Associates, Inc.
112. Hart Crowser
113. Schnabel Engineering, Inc.
114. Aquaterra Environmental Solutions, Inc.
115. Schemmer Associates
116. Arora Engineers, Inc.
117. Studio 5 Partnership Architects/Planners, LLC
118. CTL Engineering, Inc.
119. The Shaw Group, Inc.
120. Ross & Baruzzini, Inc.
121. P. W. Grosser Cosulting, Inc.
122. Parametrix
123. The LA Group Landscape Architecture and Engineering,P.C.
124. JRS Architect, P.C.
125. Golder Associates
126. Enermodal Engineering
127. Allen & Shariff Corporation
128. Hunt, Guillot & Associates, LLC
129. BKF Engineers
130. LYON ASSOCIATES, INC.
131. ESI Consultants
132. Wilson Architects
133. Michael Baker Corporation
134. Infrastructure Engineers Inc.
135. Primera Engineers, Ltd.
136. Engineering Remediation Resources Group
137. M&S Engineering LLC
138. Pennoni Associates
139. Smith Group
140. XDD, LLC
141. R&M CONSULTANTS, INC.
142. c|a ARCHITECTS
143. Sparling
144. McDermott
145. R. W. Beck, a SAIC company
146. River Consulting
147. Architects Hawaii
148. Chen and Associates
149. Rincon Consultants, Inc.
150. GH2 Architects, LLC

Honorable Mentions (in alphabetical order)
Baseline Engineering Corporation
Bohannan Huston Inc
CALVIN, GIORDANO & ASSOCIATES, INC.
CHA
CME Associates, Inc.
Crabtree, Rohrbaugh & Associates - Architects
Delta Development Group
Douglas Wood & Associates, Inc.
Dudek
Haley & Aldrich
Hanson Professional Services Inc.
Harper Houf Peterson Righellis Inc.
Interstates Engineering, Inc.
JQ (Jaster-Quintanilla)
KCI Technologies, Inc.
Kenneth Boroson Architects
LAN Associates Engineering, Planning, Architecture, Surveying, Inc.
MNS Engineers
Mulkey Engineers & Consultants
NAC|Architecture
RAND Engineering & Architecture, PC
RDK Engineers
RPA Engineering
Sebesta Blomberg
Ulteig