Please note that the names in bold are country representatives
| Organisation | Name | Country |
| KBVÖ Kompost & Biogas Verband Österreich www.kompost-biogas.info | Mr Horst Müller | Austria |
| VLACO - Flemish Compost Organisation www.vlaco.be | Ms Kristel Vandenbroek | Belgium |
| Cyprus University of Technology, Dept. of Agricultural Science, Biotechnology and Food Sciences www.cut.ac.cy | Mr Dimitris Tsaltas | Cyprus |
| CZ Biom www.czbiom.cz | Mr Jan Habart | Czech Republic |
| Genanvend Biomasse - danish biomass Recycling Association www.genanvendbiomasse.dk | Ms Julie Lykke Jacobsen | Denmark |
| Solum Group www.solum.com | Mr Morten Broegger | Denmark |
| Estonian University of Life Sciences Department of Water Management Institute of Forestry and Rural Engineering mi.emu.ee | Mr Mait Kriipsalu | Estonia |
| Finnish Biocycle and Biogas Association biokierto.fi | Ms Anna Virolainen Mr Christoph Gareis | Finland |
| Hantsch SA www.hantsch.fr | Mr Didier Hantsch | France |
| INRAE Research Unit OPAALE www.inrae.fr | Ms Anne Tremier | France |
| RÉSEAU COMPOST PLUS www.compostplus.org | Ms Karine Claireaux Ms Mathilde Borne | France |
| RITTMO Agroenvironnement www.rittmo.com | Ms Laure Metzger | France |
| SYPREA www.syprea.org | Ms Alice Paillet | France |
| VoxGaia www.voxgaia.fr | Ms Pascale Chenon | France |
| Compost.ge | Mr Davit Arjania | Georgia |
| BASF SE - Performance Polymers www.basf.com | Mr Afsaneh Nabifar | Germany |
| BGK - German Compost Quality Assurance Organisation www.kompost.de | Ms Irmgard Leifert Mr David Wilken | Germany |
| BTA www.bta-international.de | Mr Stephan Schulte | Germany |
| Fachverband Biogas www.biogas.org | Mr Mathias Hartel | Germany |
| RETERRA Service GmbH www.reterra.de | Mr Aloys Oechtering | Germany |
| Hamburg University of Technology; Institute of Waste Water Managment & Water Protection BIOCONVERSION & EMISSION CONTROL GROUP (BIEM) www.eseia.eu | Ms Ina Körner | Germany |
| Universität Stuttgart - Abfallwirtschaft www.iswa.uni-stuttgart.de | Mr Martin Kranert | Germany |
| VHE Verband der Humus- und Erdenwirtschaft e. V. www.vhe.de | Mr Michael Schneider | Germany |
| VQSD Verband zur Qualitätssicherung von Düngung und Substraten e.V. www.vqsd.de | Mr Andreas Schuch | Germany |
| W.L. GORE & Associates GmbH www.gore.com | Mr Thomas Terpetschnig | Germany |
| Deutsche Gesellschaft für Abfallwirtschaft e.V. www.dgaw.de | Isabelle Henkel | Germany |
| N3 Nachhaltigkeitsberatung www.N-hoch-drei.de | Mr Henning Friege | Germany |
| Gütegemeinschaft Kompost Region Bayern e.V. www.rgk-bayern.de | Mr Rüdiger Weiß | Germany |
| Compost Hellas www.compost.gr | Ms Katerina Xenopolou | Greece |
| Biosolids S.A. www.biosolids.gr | Mr Athanasios Savvakis | Greece |
| ASSEA BIOENERGY www.assea.gr/en/ | Ms. Apostolia Tsampouniari | Greece |
| Hungarian Compost Quality Assurance Association / University of Gödöllö www.komposzt.hu | Mr Laszlo Alexa | Hungary |
| Cré The Composting Association of Ireland www.cre.ie | Mr Percy Foster | Ireland |
| TIPA Corp Ltd. www.tipa-corp.com | Ms Julia Schifter Mr Jean Pierre Rakoutz | Israel |
| ARS AMBIENTE SRL www.arsambiente.it | Mr Michele Giavini | Italy |
| Biofactory spa (Berco SRL) www.berco.org | Mr Flavio Bizzoni | Italy |
| Integrated Waste Management Research Group Scuola Agraria del Parco di Monza www.monzaflora.it | Mr Enzo Favoino | Italy |
| Italian Compost Consortium CIC www.compost.it www.compostabile.com | Mr Massimo Centemero | Italy |
| NOVAMONT SPA www.novamont.com | Mr Christian Garaffa | Italy |
| SUMUS ITALIA SRL www.sumusitalia.it | Mr Carlo Lusi | Italy |
| SCT-Sorain Cecchini Tecno SRL www.sctecno.com | Mr Danilo Broglio Montani | Italy |
| Società Agricola Agrisolar SRL | Mr Andrea Ramazzotto | Italy |
| Società Agricola Biogreen SRL | Mr Leonardo Tresoldi | Italy |
| Società Agricola Frassine SRL | Mr Massimo Zanuso | Italy |
| University of Bologna, Dept. Of Agricultural Science www.scienzeagrarie.unibo.it | Mr Claudio Ciavatta | Italy |
| NGO Ziedine ekonomika Circulareconomy | Mr Domantas Tracevicius | Lithuania |
| BVOR - Dutch Association of Biowaste Processors www.bvor.nl | Mr Arjen Brinkmann | Netherlands |
| Dutch Waste Management Association www.verenigingafvalbedrijven.nl www.dwma.eu | Mr Unico Vankooten Ms Jennifer Kosterbos | Netherlands |
| Elsinga policyplanning and innovation www.policyplanning.eu | Mr Willem Elsinga | Netherlands |
| Avfall Norge - Waste Management Norway www.avfallnorge.no | Mr Jens Maage | Norway |
| Grønn Vekst AS gronnvekst.no | Mr Bernd Keller Ms Geir Lie | Norway |
| GWDA Spólka Wodno Sciekowa Sp.Zoo www.gwda.pl | Mr Tomasz Wojciechowski | Poland |
| Mikrobiotech www.mikrobiotech.pl | Mr Stanislaw Kolbusz | Poland |
| Polish Chamber of Waste Management (PIGO) www.pigo.org.pl | Mr Dariusz Matlak | Poland |
| Environmental Engineering Department/ Fac. of Sci. and Techn./ New University of Lisbon www.fct.unl.ptn | Ms Ana Silveira | Portugal |
| LIPOR www.lipor.pt | Ms Susana Lopes | Portugal |
| MUSAMI - Operações Municipais do Ambiente www.musami.pt | Mr Carlos Botelho | Portugal |
| Asociatia Romana a Compostului - Romanian Compost Association www.asociatiacompostului.ro | Ms Cristina Feodorov | Romania |
| Asociatia Tehnopol Galati | Mr Ionut Mocanu | Romania |
| Eko servis | Mr Vojin Djurdjevic | Serbia |
| Zdroje Zeme, a.s. | Mr Miroslav Marynčák | Slovakia |
| Ministry for the Environment and Spatial planning www.mop.gov.si | Mr Andrej Pristovnik | Slovenia |
| Ategrus www.ategrus.org | Mr Rafael Apraiz Egana | Spain |
| Agencia de Residus de Catalunya www.arc-cat.net | Mr Francesc Giró i Fontanals | Spain |
| REC - Red Espanola de Compostaje www.recompostaje.com | Ms Pilar Bernal | Spain |
| Universitat Atonoma de Barcelona (UAB) www.urbag.eu/ | Mr Juan David Arosemena | Spain |
| Avfall Sverige - Waste Management Sweden www.avfallsverige.se | Ms Caroline Steinwig | Sweden |
| Umweko GmbH Umwelt und Kompostberatung www.kompost.ch www.kschleiss.ch | Mr Konrad Schleiss | Switzerland |
| Carbon Clarity www.carbon-clarity.com | Ms Jane Gilbert | UK |
| «O.P.E.» LLC http://organic.ope.com.ua/ | Mr Sergey Prokopenko | Ukraine |