What is the simple subject of this sentence your supervisor presented market research results at meeting?

The simple subject of the sentence "Your supervisor presented market research results at the meeting" is supervisor.

Here's why:

* Subject: The subject of a sentence is the person, place, thing, or idea that the sentence is about.

* Simple Subject: The simple subject is the main noun or pronoun that performs the action of the verb.

In this sentence, the verb is "presented", and the person performing the action is the supervisor.