William Medina: UBS Advisor Faces Investor Complaint

San Juan, Puerto Rico financial advisor William Medina (CRD# 2744961) allegedly colluded in the unauthorized withdrawal of funds, according to a recent investor complaint. Financial Industry Regulatory Authority records show that he is registered as a broker and an investment advisor with UBS Financial Services.

Mr. Medina’s BrokerCheck report discloses one investor complaint. The most recent, filed in December 2025, alleges that as a representative of UBS Financial Services, he colluded with the customer’s ex-wife “to drain the account via unauthorized transfer of funds.” The pending complaint alleges unspecified damages.

Investors should be aware that FINRA rules and other securities industry standards forbid brokers like Mr. Medina from making securities transactions without the authorization of their customers. FINRA Rule 3260, for example, describes specific conditions under which they make discretionary trades—that is, the execution of transactions without prior consultation with the customer.  FINRA Rule 2010, meanwhile, stipulates that FINRA-associated persons must “observe high standards of commercial honor and just and equitable principles of trade,” which generally means that they may not execute unauthorized trades. Representatives who make transactions without proper authorization, or against a firm’s rules governing discretionary trading, may be held liable for damages or even subject to disciplinary action by FINRA and/or the Securities and Exchange Commission.

According to the Financial Industry Regulatory Authority, William Medina holds 26 years of securities industry experience. Based in San Juan, Puerto Rico, he has been registered as a broker and an investment advisor with UBS Financial Services since 2002 and 2018, respectively. His past registrations include Samuel A. Ramirez & Company, Norwest Investment Services, Wells Fargo Securities, and Clark Melvin Securities Corporation. His credentials include the passage of six securities industry qualifying exams: the Securities Industry Essentials Examination, or SIE; the Uniform Combined State Law Examination, or Series 66; the Uniform Investment Adviser Law Examination, or Series 65; the Uniform Securities Agent State Law Examination, or Series 63; the National Commodity Futures Examination, or Series 3; and the General Securities Representative Examination, or Series 7. He is licensed in California, Florida, New Mexico, New York, Puerto Rico, Texas, Virginia, and Wisconsin. (Information current as of January 24, 2026.)

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