While others certainly have a financial interest in it, it is not publicly traded and Musk solely controls it. For instance, he just unilaterally sold it to another of his privately held companies, xAI, for a valuation he made up.

Musk's privately held companies, and to a large degree Tesla as well, are all things he treats as effectively one big company that he controls; he'll take employees from one to another at will, he sells them to each other or spins them out at will in all stock transactions, etc.

The EU regulations allow seeing through such sham company boundaries that are all controlled by a single entity, and treating them as a single company.