How to Say "supplying" in Spanish
The Spanish word for “supplying” is “proveedor” — B2 level.
English → SpanishB2
adjectiveB2formal
describing an entity that provides something

Examples
La empresa proveedora de energía cortó el servicio.
The energy-supplying company cut the service.
Actúa como entidad proveedora de fondos para el proyecto.
It acts as the providing entity of funds for the project.
Adjective Agreement
When using this as a describing word, it must match what it describes. 'Empresa' (company) is feminine, so we say 'empresa proveedora'.
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