How to Say "stockholder" in Spanish
The Spanish word for “stockholder” is “accionista” — B1 level.

Examples
Soy accionista de una pequeña empresa tecnológica.
I am a shareholder in a small tech company.
Los accionistas votaron en contra de la fusión.
The shareholders voted against the merger.
Para ser el accionista mayoritario, necesitas más del cincuenta por ciento de la empresa.
To be the majority shareholder, you need more than fifty percent of the company.
The '-ista' rule for gender
Words ending in '-ista' usually don't change their ending for men and women. You use 'el accionista' for a man and 'la accionista' for a woman.
Using 'de' for ownership
To say what company someone has shares in, always use the word 'de' (of). For example: 'accionista de Apple'.
Avoid 'accionisto'
Mistake: “El accionisto está preocupado.”
Correction: El accionista está preocupado. Even when talking about a man, the word always ends in 'a'.
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