Business and Professions Code § 18897.27
ARTICLE 2. Professional Athletes and Athlete Agents
No athlete agent shall have an ownership or financial interest in any entity that directly employs athletes in the same sport as a person with whom the athlete agent has entered into an agent contract, or for whom the athlete agent is attempting to negotiate an endorsement contract, financial services contract, or professional sports service contract, or for whom the athlete agent provides advice concerning potential or actual employment as a professional athlete.