How to Say "those concerned" in Spanish
The Spanish word for “those concerned” is “interesados” — B2 level.
English → SpanishB2
NounB2formal
people who need to know

Examples
La lista de interesados en la subasta es muy larga.
The list of interested parties in the auction is very long.
Debemos notificar a todos los interesados sobre el cambio de horario.
We must notify all those concerned about the schedule change.
Adjective to Noun
In Spanish, you can often turn an adjective into a noun by adding an article (like 'los' or 'un'). Here, 'los interesados' means 'the interested ones' (people).
Related Translations
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