| ABP Engineering | 1530 |
| Alliance Technical Group | 703, 701 |
| Allied Tank And Construction | 1132 |
| Allied Valve, Inc. | 313, 412 |
| American Coalition for Ethanol | 800 |
| Apache Industrial Services, Inc. | 813 |
| Apache Stainless Equipment Corporation | 1526 |
| Applied Material Solutions, Inc. | 635 |
| Baron Filtration Co., Inc. | 1603 |
| BASF Enzymes, LLC | 621 |
| Battelle | 1201 |
| Bepex International, LLC | 1601 |
| BetaTec Hop Products, Inc. | 1421 |
| BioFuels Automation | 1113 |
| Bioleap, Inc | 2015, 2016 |
| Biomass Engineering & Equipment | 1621 |
| Bion Companies | 513 |
| Bison Engineering, Inc. | 735 |
| Brown Tank, LLC | 1333 |
| BRUKS SIWERTELL | 1205 |
| Bulk Conveyors, Inc. | 1613, 1712 |
| Carbon Sink, LLC | 1428 |
| CCS Group | 413 |
| Chase Nedrow Industries | 506 |
| ChemTreat, Inc. | 1031 |
| Christianson PLLP | 1436 |
| Clariant Corporation | 1513 |
| Clear Air Enviro-Services | 637 |
| CompuWeigh Corporation | 801 |
| Consolidated Water Solutions | 1130, 836 |
| Conveyor Engineering & Mfg. Co. | 336 |
| Cooling Tower Depot, Inc. | 803 |
| CPM | 1615 |
| Crown Americas-Crown Iron Works | 1714 |
| CTE Global, Inc. | 1323, 1321 |
| Decker Electric, Inc. | 827 |
| Direct Companies | 902 |
| Dowco Valve Company | 1303 |
| Durr Systems, Inc. | 1413 |
| DXP Enterprises | 1409, 1407 |
| Eagle Services Corporation | 1232 |
| Eco Industrial Services | 1331 |
| EcoEngineers | 636 |
| Ecolab, Inc. | 1237 |
| ENVEA, Inc. | 509 |
| ESC Spectrum | 1230 |
| Evoqua Water Technologies, LLC | 733 |
| Fagen, Inc. | 521 |
| Federal Appraisal, LLC | 1604 |
| Federal Screen Products, Inc | 507 |
| Ferm Solutions, Inc. | 936 |
| Flottweg Separation Tech | 935 |
| Fluid Quip Technologies, LLC | 1215 |
| Foundation Analytical Laboratory, Inc. | 937 |
| G Tech USA | 731 |
| GEA North America | 1437 |
| Genesis III | 1035 |
| Gilbert Industries, Inc. | 1426 |
| Global Refractory Installers & Suppliers | 626 |
| Good Land Industrial | 934 |
| GPM, Inc. | 1737 |
| Growth Energy | 1121 |
| H2O Innovation | 802 |
| Hayward Tyler, Inc. | 1033 |
| Helle Engineering | 1134 |
| Hengye, Inc. | 926 |
| Howden | 1400 |
| Hydrite Chemical Co. | 706 |
| Hydro-Thermal Corporation | 932 |
| ICM, Inc. | 921 |
| IFF | 1021 |
| Industrial Contractors, Inc. | 1300 |
| Industrial Equipment & Parts | 723 |
| IntegroEnergy Group, Inc. | 805 |
| Interra Global Corporation | 1203 |
| Interstates, Inc. | 1306 |
| J&D Construction, Inc. | 807 |
| Jackson Industrial Construction | 837 |
| Jacobs Corporation | 1605, 1704 |
| JC RAMSDELL ENVIRO SERVICE INC | 605 |
| Johnson Screens | 1501 |
| KATZEN International, Inc. | 1109, 1208 |
| K-Coe Isom | 1135 |
| Keit Spectrometers | 1536, 1534 |
| Kemin Bio Solutions | 704 |
| KFI Engineers | 630 |
| Kiewit Energy Group | 1127 |
| Komax Systems, Inc. | 527 |
| Kurita America | 901 |
| Laidig Systems, Inc. | 607 |
| Lallemand Biofuels & Distilled Spirits | 915 |
| Leaf by Lesaffre | 1415 |
| Lotus Mixers, Inc./LOTUS Process Group, LLC | 727 |
| Maas Companies, Inc. | 606 |
| Mapcon Technologies, Inc. | 1128 |
| Mason Manufacturing, LLC | 928 |
| Master Packing & Rubber Company (MPRC) | 423 |
| Merjent, Inc. | 1228 |
| Metrohm USA | 632 |
| Mid-States Millwright & Builders | 526 |
| Midwest Cooling Towers, Inc. | 608 |
| Miller Mechanical Specialties, Inc. | 1537, 1636 |
| Minnesota Bio-Fuels Association, Inc. | 1133 |
| Modular Plant Solutions | 1402 |
| MoistTech Corp. | 904 |
| Mole Master Services Corporation | 702, 700 |
| Montrose Environmental Group, Inc. | 1528 |
| MRC Global | 1434 |
| Nalco Water, an Ecolab Company | 1235 |
| National Corn-to-Ethanol Research Center | 823 |
| Nelson Baker Biotech | 1207 |
| NLB Corp. | 832, 830 |
| Novozymes | 1221 |
| P&E Solutions, LLC | 1729 |
| Paget Equipment Co. | 831, 829 |
| Painters USA | 1508 |
| Phibro Ethanol | 715 |
| Piller TSC Blower Corporation | 312 |
| Pivot Clean Energy Co. | 1725 |
| Plasma Blue | 1423 |
| Pneumat Systems, Inc. | 2009, 2010 |
| PRAJ Industries Limited | 615 |
| Precision Rotary Equipment | 427 |
| Premium Plant Services, Inc. | 1115 |
| ProQuip, Inc. | 1029 |
| Rasmussen Mechanical Services | 1337 |
| RCM Engineering-Thermal Kinetics | 315 |
| Refractory Service, Inc. | 1431 |
| Renewable Fuels Association | 1101 |
| Renewal Service, Inc. (RSI) | 1313 |
| Robinson Fans, Inc. | 1226 |
| Rudolph Research Analytical | 502 |
| Ryan & Associates, Inc. | 833 |
| Salof Ltd., Inc. | 528 |
| Schimberg Company | 828, 826 |
| Scott Equipment Company | 437 |
| SCS Engineers | 729 |
| SCS Global Services | 737 |
| Sentrimax Centrifuges (USA), Inc. | 601 |
| Separator Technology Solutions | 1234 |
| SEPCO Sealing Equipment Products Co., Inc. | 1401 |
| SGS North America Inc | 930 |
| Shandong Longda Bio-products Co., Ltd. | 409, 508 |
| Shuttlewagon | 2003, 2002 |
| Siemens Industry, Inc. | 1815 |
| Solar Turbines Incorporated | 1627 |
| Solutions 4 Manufacturing | 1129 |
| SonicAire | 1301 |
| SPX Cooling Technologies, Inc. | 2000 |
| Standard Polymers | 1500 |
| StoneAge Tools | 1837, 1835, 1833 |
| Sukup Manufacturing Co. | 809 |
| Sulzer Chemtech USA, Inc. | 2020, 2021 |
| Sulzer Pumps Solutions, Inc. | 2018, 2019 |
| Summit Carbon Solutions | 815 |
| Sys-Kool Cooling Towers | 433 |
| The CMM Group | 835 |
| The Walling Company | 1637 |
| TorcSill Foundations, LLC | 2013 |
| Trace Environmental Systems, Inc. | 1532 |
| Trackmobile Railcar Movers | 323, 321, 2001 |
| Trident Automation, Inc. | 1819 |
| Trihydro Corporation | 1335 |
| Trucent | 721 |
| Unison Energy, LLC | 1131 |
| VAA, LLC | 1427 |
| Valley Equipment Company, Inc. | 908 |
| VIAVI Solutions | 1507 |
| Viking Automatic Sprinkler Co. | 1327 |
| Vogelbusch USA, Inc. | 906 |
| Warrior Mfg., LLC | 628 |
| WCR Incorporated | 1405, 1403 |
| WEG Electric Corp. | 1304 |
| Westmor Industries, LLC | 600 |
| Whitefox Technologies Limited | 1015 |
| Williams Refractory Services, Inc. | 834 |
| WINBCO | 1404 |
| Wiss, Janney, Elstner Associates, Inc. | 1329 |
| Zachry | 2029 |
| Zenviro Tech US, Inc. | 1535 |
| Zeochem, LLC | 1305 |