William Klatoff Weinstein (CRD #462058) Was Barred by FINRA
William Klatoff Weinstein (CRD #462058) has been the subject of disciplinary disclosures reported on FINRA’s BrokerCheck. Public records reflect that William Klatoff Weinstein was discharged by a member firm after allegations involving off-channel communications and systems access, and later consented to a permanent bar after failing to provide documents and information requested by FINRA. If you have worked with William Klatoff Weinstein and you have concerns about his activity, keep reading.
BrokerCheck link: William Weinstein FINRA BrokerCheck
BrokerCheck report: William Weinstein FINRA BrokerCheck report (PDF)
Regulatory action (FINRA)
According to William Weinstein’s FINRA BrokerCheck disclosure summary, FINRA initiated a regulatory action on December 8, 2025, and the matter was resolved through an Acceptance, Waiver & Consent (AWC). The disclosure states that, without admitting or denying the findings, William Weinstein consented to the entry of findings that he failed to provide documents and information requested by FINRA. The AWC explains that the matter originated from FINRA’s investigation of the Form U5 filed by Marex Capital Markets Inc., which stated that he was terminated for “violations of firm policies related to off-channel communications and systems access.”
AWC link: Letter of Acceptance, Waiver & Consent (AWC)
The AWC reflects that FINRA requested information and documents pursuant to FINRA Rule 8210, and that William Weinstein’s refusal to provide the requested information constituted violations of FINRA Rules 8210 and 2010. FINRA imposed a permanent bar from associating with any FINRA member in any capacity.
Regulatory action (SEC)
William Weinstein’s FINRA BrokerCheck report also reflects a Securities and Exchange Commission (SEC) regulatory action initiated on July 19, 1977 and resolved by consent on August 1, 1977, resulting in a censure. The report states that the SEC alleged failure to supervise the employees with a view toward preventing violations of the anti-fraud provisions of the Securities Act of 1933 and Securities Exchange Act of 1934, and violations of the books and records provisions of the Securities Exchange Act of 1934.
Employment separation after allegations
William Weinstein’s FINRA BrokerCheck report reflects that Marex Capital Markets Inc. discharged him on January 29, 2025. The firm reported allegations that he used an unapproved email address to conduct firm business and impermissibly provided colleagues his login credentials to access firm systems on his behalf.
Rule summary #1: FINRA Rule 8210
FINRA Rule 8210 gives FINRA authority to request documents, information, and testimony from associated persons (and others subject to FINRA’s jurisdiction) in connection with investigations, complaints, examinations, or proceedings. A refusal to provide requested information can result in significant sanctions, including a bar.
FINRA Rule 8210 link: FINRA Rule 8210
Rule summary #2: FINRA Rule 2010
FINRA Rule 2010 is a broad, principles-based rule requiring firms and associated persons to observe high standards of commercial honor and just and equitable principles of trade. FINRA frequently cites Rule 2010 alongside more specific rules as an additional basis for discipline when it alleges conduct falls below expected ethical standards.
FINRA Rule 2010 link: FINRA Rule 2010
Why this matters to investors (Regulation Best Interest)
Regulation Best Interest (Reg BI) is a U.S. securities regulation designed to strengthen the standard of conduct that broker-dealers owe to retail investors when making recommendations about securities transactions or investment strategies. Adopted by the U.S. Securities and Exchange Commission and effective as of June 30, 2020, Reg BI aims to enhance investor protection while preserving investor access to brokerage products and services.
Reg BI requires broker-dealers and financial advisors to act in the best interest of the retail customer at the time a recommendation is made, and not to place their own financial or other interests ahead of the customer’s. This represents a higher standard than the historical “suitability” requirement, which only required that recommendations be suitable, not necessarily optimal or conflict-free.
Reg BI is built around four key obligations:
- Disclosure Obligation – Broker-dealers must disclose material facts about the relationship and recommendations, including fees, scope of services, and conflicts of interest.
- Care Obligation – Recommendations must be made with reasonable diligence, care, and skill, considering costs, risks, and alternatives.
- Conflict of Interest Obligation – Firms must identify, disclose, and mitigate or eliminate conflicts, particularly those that create incentives to favor one product over another.
- Compliance Obligation – Firms must establish policies and procedures designed to ensure compliance with Reg BI as a whole.
Importantly, Reg BI applies at the recommendation level, not as a continuous duty like the fiduciary standard applicable to registered investment advisers. Still, it significantly narrows the gap by emphasizing cost considerations, conflict management, and investor-focused decision-making.
Overall, Regulation Best Interest (Reg BI) seeks to promote transparency, improve the quality of investment recommendations, and reinforce trust between retail investors and broker-dealers in the U.S. securities markets.
Background information (from BrokerCheck)
Based on his BrokerCheck Report, William Weinstein reportedly:
- Is not currently registered with a brokerage firm.
- Has passed the Series 24, Series 00, Series 7TO, SIE, Series 41, and Series 1 exams.
- Was previously registered with firms that include Marex Capital Markets Inc., Cowen and Company, Cowen Prime Services LLC, Cowen Prime Services Trading LLC, The Chicago Corporation, Montgomery Securities, and Oppenheimer & Co., Inc.
Kurta Law Can Help
If you have worked with William Weinstein and you have concerns about his activity, you may have recovery options. Kurta Law can help investors understand potential claims, investigate misconduct, and pursue recovery through FINRA arbitration where appropriate. Contact Kurta Law at 877-600-0098 or info@kurtalawfirm.com for a free consultation.
Helpful resources: Jonathan Aguilera Barred by FINRA | Linda Sokol Francis Barred by FINRA
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