| ABET LAMINATI | Bra (CN) | | |
| ACUTEC | Moncalieri (TO) | | |
| AERTECNICA CROCI Srl | Pombia (NO) | | |
| Akukon Oy Consulting Engineers | Helsinki | | < 10 |
| ALLEMANO METROLOGY | Torino (TO) | | |
| Allied Environmental Consultants Pty Ltd | North Fremantle | | |
| ARES | Torino (TO) | | |
| Barclay Engineering Pty Ltd | Welshpool | | |
| Biogénie SRDC inc. | Sainte-Foy | | |
| BOSCO ITALIA | San Mauro Torinese (TO) | | |
| CHIM.ECO | Nichelino (TO) | | |
| COMAR | Robassomero (TO) | | |
| Consulting Engineers Paavo Ristola Ltd | Jyväskylä | | 100 > |
| CORALIMPIANTI | Lein (TO) | | |
| COSTRUZIONI MECCANICHE VALENTE di Valente Luciano | Nole Canavese (TO) | | |
| DE.CO.ENGINEERING | Caselle Torinese (TO) | | |
| EkoStandart [Ecological Standard] | St. Petersburg | | |
| Eksperementalno-proizvodstvennaya masterskaya pri Glavnoi geofizicheskoi observatorii im. A. I.Voiekova ( Experemantal industrial workshop of A.I. Voiekova) | St. Petersburg | | |
| Environment and Business Layers Ltd | Helsinki | | < 10 |
| Environmental Resources Management Australia Pty Ltd (ERM) | Perth | | |
| F.LLI FERNITICO DI FERNITICO F. & C. S.N.C. | Rivoli (TO) | | |
| Finnish Acoustics Centre Ltd | Helsinki | | < 10 |
| FORNARA CARPENTERIE | Paruzzaro (NO) | | |
| Green Innovation Osuuskunta | Turku | | < 10 |
| Groupe Conseil Gesco inc. | Saint-Jean-Chrysostome | | 20-100 |
| Hämeen Ympäristösuunnittelu | Hämeenlinna | <0,2 M€ | < 10 |
| Herring Storer Acoustics | Como | | |
| INGEMANSSON TECHNOLOGY AB FILIALKONTOR | UPPSALA | <0,2 M€ | < 10 |
| INGEMANSSON TECHNOLOGY AB FILIALKONTOR | JÖNKÖPING | <0,2 M€ | < 10 |
| INGEMANSSON TECHNOLOGY AB FILIALKONTOR | UMEÅ | 0,2-1 M€ | < 10 |
| INGEMANSSON TECHNOLOGY AB FILIALKONTOR | STOCKHOLM | 2-5 M€ | 20-100 |
| INGEMANSSON TECHNOLOGY AB FILIALKONTOR | ÖRNSKÖLDSVIK | 0,2-1 M€ | < 10 |
| INGEMANSSON TECHNOLOGY AB FILIALKONTOR | MALMÖ | 0,2-1 M€ | < 10 |
| INGEMANSSON TECHNOLOGY AB HUVUDKONTOR | GÖTEBORG | 2-5 M€ | 20-100 |
| INGENJÖRSFIRMA BÖRJE LUND AKTIEBOLAG | PARTILLE | <0,2 M€ | < 10 |
| Insinööritoimisto Akukon Oy | Helsinki | | 10-19 |
| IPSE | Settimo Torinese (TO) | | |
| ISOLPACK SPA | Torino (TO) | | |
| L.A.R.A. | Nichelino (TO) | | |
| MAAC 99 | Torino (TO) | | |
| MICROBEL | Torino (TO) | | |
| MIP Electronics Oy | Kerava | | < 10 |
| MPL Health, Safety and Environmental Solutions (WA) | Myaree Business Centre | | |
| N.D. Engineering Enterprises Pty Ltd | Malaga | | |
| NIBBIO | Pianezza (TO) | | |
| Noise and Sound Consulting Hansa Ecuras Ltd. | Jyväskylä | | < 10 |
| NPF Rivt [Scientific-Manufacturing Firm "Research & Development of Technologies] | St. Petersburg | | |
| Paavo Ristola Consulting Engineers Ltd | Hollola | 2-5 M€ | 20-100 |
| Pesonen Kari Consuting Eng. Ltd. | Helsinki | | |
| Plancenter Ltd. | Jyväskylä | | 100 > |
| Polikhim NPP OOO | Sosnovyj bor | | |
| Potok NPO [Stream] | St. Petersburg | | |
| Proektno-Issledovatelskij Institut Vodoochistki [Project & Research Institute of Water Purification] | St. Petersburg | | |
| Promethor Oy | Turku | 0,2-1 M€ | < 10 |
| Rejlers Oy | Hämeenlinna | | 10-19 |
| ROSATI FRATELLI S.R.L. | Lein (TO) | | |
| S.I.R.A. Societ… Italiana Risanamento Acustico | Alpignano (TO) | | |
| SAINT-GOBAIN ECOPHON AKTIEBOLAG | HYLLINGE | >10 M€ | 100 > |
| SAINT-GOBAIN ECOPHON AKTIEBOLAG | SUNDSVALL | 0,2-1 M€ | < 10 |
| SAINT-GOBAIN ECOPHON AKTIEBOLAG | VÄXJÖ | 0,2-1 M€ | < 10 |
| SAINT-GOBAIN ECOPHON AKTIEBOLAG | MÖLNDAL | 0,2-1 M€ | < 10 |
| SAINT-GOBAIN ECOPHON AKTIEBOLAG | STOCKHOLM | 1-2 M€ | < 10 |
| SAINT-GOBAIN ECOPHON AKTIEBOLAG | ÖREBRO | 0,2-1 M€ | < 10 |
| SAINT-GOBAIN ECOPHON AKTIEBOLAG | SKELLEFTEÅ | 0,2-1 M€ | < 10 |
| SCM di Artusio & C. | Treiso d'Alba (CN) | | |
| Seiregrupp OÜ | Tallinn | <0,2 M€ | < 10 |
| Severo-Evropejskij Mezhregional'nyj Territorial'nyj Okrug po
Nadzoru za Yadernoj i Radiacionnoj Bezopasnost'ju Federal'noj Sluzhby po Ekologicheskomu Tehnologicheskomu i Atomnomu Nadzoru [North-European Inter-Regional Territorial Region of Nuclear & Radia | St. Petersburg | | |
| SGF di Lerda & C. | Volvera (TO) | | |
| Sinclair Knight Merz Pty Ltd | Perth | | |
| SITAV | Torino (TO) | | |
| SPbOO Ekologija i Biznes [Ecology & Business] | St. Petersburg | | |
| STUDIO GIUNTOLI ARCHITETTI | Torino (TO) | | |
| Suomen Akustiikkakeskus Oy | Helsinki | | < 10 |
| SVANÅ MILJÖTEKNIK AKTIEBOLAG | SKULTUNA | 0,2-1 M€ | < 10 |
| TECNIC TECNOLOGIE | Monticello d'Alba (CN) | | |
| TEKSPAN | Trofarello (TO) | | |
| TUBOSIDER | Asti (AT) | | |
| UK-Muovi Oy | Iisalmi | >10 M€ | 20-100 |
| Vipac Engineers and Scientists Ltd | Ascot | | |
| Vipac Engineers and Scientists Ltd | Ascot | | |
| VOSHOD | St. Petersburg | | |
| Westicon Oy | Forssa | | < 10 |
