UBS Advisor William Medina Accused of Investor Complaint by Carlson Law

A recent investor complaint has emerged accusing William Medina, a financial advisor based in San Juan, Puerto Rico, of engaging in unauthorized withdrawal of funds in collaboration with a client’s ex-wife. This complaint, filed in December 2025, alleges that Medina, who is registered as a broker and investment advisor with UBS Financial Services, participated in draining the customer’s account through illicit fund transfers. The complaint specifies damages but is still pending resolution.

It is crucial for investors to understand that regulations set by the Financial Industry Regulatory Authority (FINRA) and other industry standards prohibit brokers like Medina from conducting securities transactions without explicit authorization from their clients. FINRA Rule 3260 outlines the conditions under which brokers can make discretionary trades, meaning executing transactions without prior client approval. Additionally, FINRA Rule 2010 mandates all FINRA-associated individuals to adhere to high ethical standards and just principles of trade, barring them from executing unauthorized trades. Brokers found in violation of these rules may face financial penalties, disciplinary measures, or even regulatory action by FINRA and the Securities and Exchange Commission.

William Medina boasts 26 years of experience in the securities industry and is currently registered as a broker and investment advisor with UBS Financial Services. He has held previous registrations with notable firms such as Samuel A. Ramirez & Company, Norwest Investment Services, Wells Fargo Securities, and Clark Melvin Securities Corporation. Medina has successfully passed six securities industry qualifying exams, including the Securities Industry Essentials Examination (SIE), Series 66, Series 65, Series 63, Series 3, and Series 7. He holds licenses in multiple states, including California, Florida, New Mexico, New York, Puerto Rico, Texas, Virginia, and Wisconsin.

In the event that investors have experienced losses due to the misconduct of financial advisors or investment firms, Carlson Law offers legal representation throughout the United States. Those affected by investment losses are encouraged to contact Carlson Law for a confidential consultation by calling 888-976-6111 or completing the contact form provided on their website.

The case involving William Medina serves as a cautionary tale for investors, highlighting the importance of conducting due diligence when working with financial advisors and remaining vigilant against unauthorized transactions that can lead to substantial financial losses.