The pronoun "who" is in the nominative case; the pronoun "whom" is in the objective case.

Question

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The nominative case is typically the subject of a sentence. Consider this sentence: Who likes the Yankees? The word Who is in the nominative case because it is used as a subject. The objective case is used when the word is an object of a verb or preposition. Consider this sentence: Darla is the friend for whom we are waiting. Whom is in the objective case because it is the object of the preposition for.

The Pronoun "Who" Is in the Nominative Case; the Pronoun