Finding trades in a brokerage account that you never approved can feel surreal. One day the account appears routine; the next, there are purchases, sales, options activity, margin use, or rapid in-and-out trading you do not recognize. In general terms, that situation often raises an unauthorized trading issue, and it can overlap with other problems like excessive trading, unsuitable recommendations, account takeover, or failures in supervision.
Unauthorized trading cases are common enough that they appear regularly in FINRA’s investor guidance, SEC investor materials, and FINRA’s dispute-resolution resources. And when investors are seeking money damages from a brokerage firm or broker, those disputes often end up in FINRA arbitration rather than court, which is part of the broader process explained in this overview of securities arbitration and FINRA disputes.
In this post, you’ll learn what unauthorized trading usually means, how account control becomes a central issue, what damages may be claimed, what defenses firms often raise, and why early case analysis can matter.
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Unauthorized trading generally refers to a broker or brokerage firm placing trades in a customer’s account without the customer’s prior approval and without valid written discretionary authority. FINRA’s rule on discretionary accounts states that a registered representative generally cannot exercise discretionary power in a customer account unless the customer gives prior written authorization to a specifically identified person and the firm accepts the account in writing. The rule also allows a narrow exception for limited time-and-price discretion, typically lasting only through the end of the business day unless there is written contrary instruction. See FINRA Rule 3260.
That distinction matters. Not every trade you dislike is unauthorized. A poor recommendation, a risky investment, or a losing trade can be unsuitable without being unauthorized. By contrast, unauthorized trading focuses on control: who decided to place the trade, what authority existed, and whether the investor actually approved the transaction beforehand.
For readers looking for a more introductory walkthrough of these claims, this plain-language guide to unapproved trades and FINRA claims goes deeper into the basics.
Unauthorized trading tends to show up in a few recurring patterns.
This is the classic fact pattern. The investor says no permission was given, but the account shows purchases or sales anyway. Sometimes this happens after a relationship becomes informal and the broker starts “taking initiative.” FINRA has noted examination findings where representatives executed transactions “as an accommodation” without receiving specific customer authorization for the trade, which can still violate the rules. See FINRA’s exam findings on abuse of authority.
Many investors rely heavily on a financial professional, especially elderly investors or people with little market experience. But trust is not the same as written discretion. A customer may defer to a broker’s suggestions and still retain final decision-making authority. If trades were entered without actual authorization, the case may still be framed as unauthorized trading even if the broker says the customer typically followed recommendations.
Some cases involve more than isolated trades. The investor may say the broker was running the account as if it were discretionary, making repeated decisions without real-time approval. In those situations, unauthorized trading may overlap with churning, excessive trading, or broader account abuse.