| Baylor College of Medicine |
12,242 |
| Fort Bend Independent School District |
7,245 |
| Administaff, Inc. |
2,150 |
| ConocoPhillips Company |
2,028 |
| Rice University |
2,026 |
| Coldwell Banker United |
1,729 |
| BMC Software, Inc. |
1,708 |
| Stephen F. Austin State University |
1,546 |
| Halliburton Company |
1,513 |
| SYSCO Corporation |
1,490 |
| Fulbright |
1,372 |
| Baker Hughes Incorporated |
1,358 |
| Vinson & Elkins L.L.P. |
1,272 |
| Anadarko Petroleum Corporation |
1,080 |
| Baker Botts LLP |
1,067 |
| Prairie View A&M University |
1,003 |
| Lamar University |
980 |
| El Paso Corporation |
950 |
| Marathon Oil Corporation |
943 |
| Blinn College |
934 |
| Stewart Information Services Corporation |
897 |
| Continental Airlines, Inc. |
821 |
| City of Houston, Texas |
802 |
| Fort Bend County, Texas |
792 |
| Houston Independent School District |
774 |
| National Oilwell Varco |
761 |
| CenterPoint Energy, Inc. |
757 |
| Harris County, Texas |
724 |
| The Texas A&M University System Health Science Center |
696 |
| Atos Origin NA, Inc. |
609 |
| Transwestern Commercial Services |
602 |
| FMC Corporation |
599 |
| COMSYS IT Partners, Inc. |
585 |
| University of Texas Medical Branch |
580 |
| Tesco Corporation |
574 |
| Weatherford International Ltd. |
554 |
| Bracewell |
550 |
| Texas Children's Hospital |
517 |
| Galveston Independent School District |
512 |
| CORESTAFF Services |
493 |
| LAMAR CISD |
472 |
| UH-Downtown |
459 |
| Texas A & M University at Galveston |
450 |
| Smith International, Inc. |
414 |
| Harris County, Texas |
411 |
| KBR, Inc. |
410 |
| Aker Solutions |
405 |
| BJ Services Company |
388 |
| Service Corporation International |
376 |
| WESCO International, Inc. |
366 |
| EOG Resources, Inc. |
350 |
| Wood Group |
343 |
| Homeland Properties |
327 |
| Dynegy Inc. |
327 |
| St. Luke's Episcopal Health System |
321 |
| Benchmark Hospitality International |
318 |
| Cyberonics, Inc. |
315 |
| College of the Mainland |
307 |
| Conroe Independent School District |
290 |
| Lamar State College, Port Arthur |
286 |
| PrincetonOne |
281 |
| Lee College |
279 |
| Marathon Petroleum Company |
276 |
| Wharton County Junior College |
276 |
| The Menninger Clinic |
274 |
| Enterprise Products Partners L.P |
266 |
| Heritage Texas Properties - Mary J. Steele |
263 |
| Spectra Energy Partners, L.P. |
262 |
| Noble Energy, Inc. |
260 |
| Chicago Bridge & Iron Company |
253 |
| The Men's Wearhouse, Inc. |
252 |
| Alvin Comm College |
251 |
| Newfield Exploration Company |
247 |
| Integrated Electrical Services, Inc. |
245 |
| Argus Financial Software |
245 |
| NetIQ |
244 |
| Academy Sports & Outdoors |
240 |
| Oceaneering International, Inc. |
238 |
| Brazosport College |
233 |
| Transocean Inc. |
227 |
| CEMEX USA, Inc. |
225 |
| Marathon Ashland Petroleum LLC |
221 |
| Southwestern Energy Company |
220 |
| PM Realty Group Lp |
218 |
| KLEIN ISD |
218 |
| John Daugherty Realtors |
218 |
| M-I SWACO |
217 |
| Benchmark Electronics, Inc. |
217 |
| Martha Turner Properties |
214 |
| CYPRESS-FAIRBANKS ISD |
212 |
| TietoEnator |
211 |
| Region 5 Education Service Center |
205 |
| Methodist Health Care System |
204 |
| American National Insurance Company |
203 |
| CGGVeritas |
202 |
| Kirby Corporation |
194 |
| Republic National Distributing Company, Inc. |
192 |
| Angelina College |
190 |
| Nabors Drilling USA, LP |
185 |
| Texas Southern University |
182 |
| Champion Technologies, Inc. |
175 |
| Mustang Engineering, Inc. |
175 |
| Loomis, Fargo & Company |
175 |
| IFCO Systems North America, Inc. |
173 |
| Greenwood-King Properties |
170 |
| HUMBLE ISD |
169 |
| Pasadena Independent School District |
169 |
| Beaumont Enterprise |
168 |
| Pride International, Inc. |
165 |
| McDermott International, Inc. |
164 |
| NetVersant Solutions, Inc |
162 |
| Wilson |
161 |
| Lake Olympia Middle School/Fort Bend ISD |
158 |
| Spring Independent School District |
157 |
| Stage Stores |
157 |
| FreshPoint, Inc. |
156 |
| PEARLAND ISD |
154 |
| HCC Insurance Holdings, Inc. |
154 |
| Quanta Services, Inc. |
153 |
| NCI Building Systems, Inc. |
152 |
| Aldine Independent School District |
152 |
| Helix Energy Solutions Group, Inc. |
151 |
| Sasol North America Inc. |
149 |
| Harris County Hospital District |
149 |
| WAIS MedClub |
147 |
| Sterling Bancshares, Inc. |
146 |
| Rosetta Inc |
146 |
| Education Service Center Region VI |
144 |
| Montgomery County |
144 |
| Noble Corporation |
142 |
| ALPINE ISD |
141 |
| Episcopal High School of Bellaire |
139 |
| Weingarten Realty Investors |
138 |
| National Oilwell Varco, Inc. |
136 |
| San Jacinto College Central |
133 |
| East Chambers Isd (036-903) |
132 |
| Porter |
130 |
| BRYAN ISD |
129 |
| Lexicon Pharmaceuticals, Inc |
128 |
| Foxconn Corporation |
126 |
| ANDREWS ISD |
125 |
| Katy Independent School District |
123 |
| Valdosta State University |
122 |
| Houston Baptist University |
122 |
| Camden Property Trust |
120 |
| Powell Industries, Inc. |
119 |
| Goodman Global, Inc. |
118 |
| Caprock Communications Inc |
117 |
| Hilcorp Energy Company |
116 |
| Tenaris |
115 |
| Technology Partners International, Inc. |
114 |
| Wacker, Inc. |
114 |
| Greater Houston Partnership |
114 |
| City of Huntsville, Texas |
113 |
| YMCA of Greater Houston |
112 |
| Coats Rose Yale Ryman Lee |
112 |
| Chamberlain, Hrdlicka, White, Williams |
111 |
| Aramco Services Company |
111 |
| ABS Consulting, Risk Management |
110 |
| KS Management Services |
109 |
| Cheniere Energy, Inc. |
107 |
| EAST BERNARD ISD |
106 |
| Port of Houston |
106 |
| Goose Creek ISD |
106 |
| Cabot Oil & Gas Corporation |
106 |
| FleetPride, Inc. |
106 |
| PROS Holdings, Inc. |
106 |
| Beirne, Maynard, |
105 |
| Alief Independent School District |
104 |
| Mitsubishi Caterpillar Forklift America, Inc. |
104 |
| Lufkin Industries, Inc. |
102 |
| Kaiser Aluminum Corporation |
101 |
| City of Bryan |
101 |
| Magnolia Independent School District |
101 |
| Brookshire Brothers, Ltd. |
98 |
| Region 4 Education Service Center |
98 |
| KHOU-TV (CBS 11) |
97 |
| Consolidated Graphics, Inc. |
96 |
| Jardine Lloyd Thompson LLC |
96 |
| Houston Association of Realtors |
95 |
| Cornell Companies, Inc. |
94 |
| CMAI- Chemical Market Associates, Inc. |
93 |
| David Weekley Homes (US Headquarters) |
93 |
| Aggreko USA LLC |
92 |
| TOMBALL ISD |
91 |
| University of St. Thomas - Houston |
90 |
| Bryan-College Station Eagle |
89 |
| Merichem Company |
89 |
| Philip Services Corporation (PSC) |
89 |
| Fairfield Industries |
88 |
| TEPPCO Partners, L.P. |
88 |
| University of Houston - Clear Lake |
88 |
| Signature Hospital |
87 |
| Vopak Terminals North America Inc |
86 |
| Allied Home Mortgage Capital Corporation |
85 |
| Repsol YPF |
85 |
| Oil States International, Inc. |
83 |
| VeriCenter, Inc. |
83 |
| The Panhandle Pipe Line Company |
82 |
| P2 Energy Solutions Inc. |
82 |
