| ABB | |
| ABV | |
| ACCYSA | |
| ACEVISION (BEIJING) EXHIBITION CO., LTD. | |
| ACQUA-SOLFIT, S.L. | |
| ADASA SISTEMAS | |
| ADEAGUA APLICACIONES HIDRAULICAS SL. | |
| ADIEGO HERMANOS | |
| ADIQUIMICA, S.A. | |
| AERZEN IBÉRICA, S.A.U. | |
| AGRAGEX | |
| AGRUQUERO | |
| AGS WATER SOLUTIONS | |
| AGUAS DE LAS CUENCAS DE ESPAÑA (ACUAES) | |
| AIGUAPRES SL | |
| AINTAS | |
| AIOTWAVES-GRUPO AMPER | |
| ALFIT FITTINGS SOLUTIONS, S.L. | |
| ALIAXIS IBERIA | |
| ALLENGRA FLOWMETERS | |