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Broker Misconduct Investigation: Mary Ann Best (Sanford Bernstein)

If you have lost money in the stock market due to fraud, misrepresentation, negligence, or for other reasons, we can help you. We have successfully recovered over $250 million in FINRA securities arbitrations.*

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Updated on: September 28, 2025

National investment loss lawyers KlaymanToskes is investigating broker Mary Ann Best (CRD# 4389355) of Sanford C. Bernstein & Co. (AllianceBernstein, L.P.) after a customer complaint was filed with the Financial Industry Regulatory Authority (“FINRA”), alleging $489,703 in damages due to unsuitable recommendations to invest in Alternative Investments. The complaint was settled in favor of the investor for $400,000.

According to FINRA BrokerCheck, broker Mary Ann Best is currently registered as a broker and investment advisor with Sanford C. Bernstein & Co. (AllianceBernstein, L.P.) in Washington, D.C. 

The broker’s comment listed on the complaint states: “The firm and the registered representative deny the allegations and believe they are without merit. Customer chose to invest in the product at issue after the risk of loss was fully disclosed and after the customer independently determined that the product was an appropriate investment. In effect, the customer is expecting the registered representative and the firm to guarantee the investment’s performance. By entering into a settlement with the customer, the firm and the registered representative admit no liability whatsoever and deny any and all liabilities claimed by the customer.”

Investors that suffered losses with broker Mary Ann Best are encouraged to contact attorney Lawrence L. Klayman, Esq., at 888-997-9956 or by email at investigations@klaymantoskes.com to discuss potential recovery options. We do not collect attorney’s fees unless we are able to obtain a financial recovery for you.

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Investment Losses with Broker Mary Ann Best?

KlaymanToskes is a leading national investment loss law firm that represents the interests of investors throughout the world who have suffered losses due to broker misconduct, investment fraud, and securities violations. 

If you suffered losses with broker Mary Ann Best, contact KlaymanToskes at 888-997-9956 or fill out a short contact form for a free and confidential consultation.

The firm has helped recover over $600 million* for investors, and can help you determine if your loss is due to financial advisor misconduct, unsuitable investment advice, and/or other securities violations.

*Exclusive of attorneys fees and costs.

Signs Investors Should Look Out For About Their Brokerage Accounts

As an investor, there are a few signs that you should look out for if you believe you may have a claim against your financial advisor. These signs could potentially indicate misconduct, negligence, or investment fraud. Investors are encouraged to contact our firm immediately if you have experienced any of the following:

  • You have substantial losses in your investment accounts
  • You received a call, email, or other communication from your broker’s supervisor or manager regarding your portfolio
  • Your broker misrepresented investment opportunities, or failed to disclose details about investments
  • You notice unauthorized transactions in your investment accounts
  • Your broker is not returning your calls or emails
  • You filed a complaint with your brokerage firm that has not been resolved
  • You see a mistake on your statement, or receive a fraudulent statement

Some investors have close relationships with their brokers due to the time and trust built over the course of their investment relationship. However, it is crucial to remember that financial decisions should be based on careful analysis and due diligence rather than solely relying on personal relationships.

Engaging the services of an experienced securities attorney to evaluate your specific circumstances is strongly advised. At KlaymanToskes, our team of experienced securities attorneys has a deep understanding of this complex area of law, allowing us to provide invaluable insight and tailored guidance that directly addresses your individual needs.

If you suffered losses with broker Mary Ann Best, or have concerns regarding your investment portfolio at Sanford Bernstein, or with any other financial advisor or firm, contact KlaymanToskes at 888-997-9956 or fill out a short contact form for a free and confidential consultation.