Churning — a broker trading excessively in your account to generate commissions rather than to benefit your portfolio — is illegal because it violates the Securities Exchange Act of 1934, SEC Rule 10b-5, the SEC’s Regulation Best Interest, and FINRA suitability rules. The conduct is treated as securities fraud: the broker is using your account to serve their own compensation instead of your investment goals. Willful violations can carry criminal fines up to $5 million and up to 20 years in prison for an individual, alongside civil liability and industry bars.
The Laws and Rules Churning Violates
Section 10(b) of the Securities Exchange Act of 1934 makes it unlawful to use any deceptive practice in connection with buying or selling securities.1Office of the Law Revision Counsel. 15 U.S. Code 78j – Manipulative and Deceptive Devices SEC Rule 10b-5, adopted under that section, specifically prohibits fraudulent schemes and material misrepresentations in securities transactions.2Cornell Law School. Rule 10b-5 A broker who churns is deceiving the client about whose interest the trading serves, which brings the conduct squarely inside these provisions.
The SEC’s Regulation Best Interest, effective since June 2020, added another layer. Reg BI requires broker-dealers to act in a retail customer’s best interest when recommending transactions and explicitly prohibits excessive trading regardless of whether the broker has formal control over the account. That closed a gap that had made some churning claims harder to prove in non-discretionary accounts.
FINRA Rule 2111 imposes a quantitative suitability requirement at the industry level: the total number and frequency of recommended trades must be reasonable given your investment profile, even if each trade in isolation looked acceptable.3FINRA. FINRA Rule 2111 – Suitability A broker who churns typically breaks several rules at once — the federal statute, the SEC rule, Reg BI, and FINRA’s suitability standard.
Penalties reflect how seriously the law treats the conduct. Under 15 U.S.C. § 78ff, an individual convicted of willful securities fraud faces fines up to $5 million and up to 20 years in prison; a firm can be fined up to $25 million.4GovInfo. 15 U.S. Code 78ff – Penalties FINRA can also impose fines, suspensions, and permanent industry bars on brokers and firms.
What Has to Be Proven
A churning claim, whether in court or FINRA arbitration, has three elements. All three must be established.
Broker control. The broker must have been driving the trading decisions. Formal discretionary authority is the clearest proof, but control also exists when you routinely followed recommendations without independently evaluating them. Courts look at whether you had the knowledge and experience to push back. A broker who dominated every recommendation is considered to have had practical control even if you technically approved each ticket.
Excessive trading. The volume and frequency of trades must be unreasonable relative to your goals and financial situation. Someone who told their broker they wanted steady, conservative growth should not see the portfolio turned over multiple times a year. The mismatch between stated objectives and the actual trading pattern is what shows the broker was generating commissions rather than returns.
Scienter. This is the intent element. It means intent to defraud or reckless disregard for your interests, and it separates honest misjudgment from deliberate self-dealing. You don’t need to prove the broker sat down and hatched a scheme. Reckless indifference to the harm being caused is enough.
How Regulators Measure Excessive Trading
Two formulas dominate churning analysis.
The turnover rate measures how many times your portfolio’s average net equity was replaced over a year. If you had $100,000 in average equity and $600,000 in total purchases during the year, the turnover rate is 6. FINRA has recognized that a turnover rate of 6 or higher generally indicates excessive trading.5FINRA. Regulatory Notice 18-13 – Quantitative Suitability
The cost-to-equity ratio calculates the annual return the account would need to earn just to cover commissions and fees before you see any profit. A ratio above 20% is widely viewed as strong evidence of churning.5FINRA. Regulatory Notice 18-13 – Quantitative Suitability If your account needed to grow by a fifth of its value each year just to break even on costs, the strategy was almost certainly serving the broker.
These are not rigid cutoffs. An account with genuinely aggressive objectives can tolerate higher activity than a conservative one. But once numbers cross these thresholds, the broker has a hard time justifying the trading.
Red Flags in Your Account
Most churning victims don’t realize what is happening until real damage has accumulated. The patterns to watch for:
- Frequent unsolicited trades — activity you didn’t specifically request or discuss beforehand.
- Mislabeled confirmations, such as trades you know the broker suggested that appear as “unsolicited,” or “solicited” trades you don’t recall agreeing to.6FINRA. Are You Checking Your Trade Confirmations
- Rapid in-and-out trading of similar securities within short periods, sometimes called switching.
- Commissions and transaction costs consuming a large share of the account despite heavy activity.
- Unexplained charges on confirmations, such as handling fees or surcharges that were never disclosed.6FINRA. Are You Checking Your Trade Confirmations
- Portfolio performance well below comparable benchmarks even though the broker is trading heavily.
If you spot several of these, pull your statements and calculate the turnover rate. Divide total purchases for the year by average account equity. The math takes minutes and tells you quickly whether the account is in the danger zone.
Deadlines That Can End a Claim Before It Starts
Churning claims have strict time limits, and missing them can permanently bar recovery.
For a private lawsuit under Section 10(b) and Rule 10b-5, you have two years from discovering the facts behind the violation, and no more than five years from the violation itself, whichever hits first.7Office of the Law Revision Counsel. 28 USC 1658 – Time Limitations on the Commencement of Civil Actions The two-year clock starts when you knew or should have known about the excessive trading. If the broker was concealing the activity, the discovery date shifts later, but the five-year outer limit is absolute.
For FINRA arbitration, which is the more common path because most brokerage agreements require it, the claim must be filed within six years of the event giving rise to it.8FINRA. FINRA Rule 12206 – Time Limits There is no separate discovery provision in the arbitration rule; the six years run from the occurrence.
If you suspect churning, start gathering records now rather than waiting to see if the problem resolves itself.
How to File a Complaint
Documentation
Assemble every monthly account statement and trade confirmation covering the period of suspected excessive trading. These give you the raw data to calculate turnover and cost-to-equity. Pull together emails, texts, and notes from phone calls with your broker showing what was discussed, recommended, or authorized. Organize the materials chronologically so a regulator or arbitrator can follow the pattern.
Look up your broker and their firm on FINRA’s BrokerCheck to find the CRD registration number and any prior complaints or disciplinary history.9FINRA. About BrokerCheck Prior marks strengthen the pattern of misconduct.
Where to Submit
You have two main paths and can use both. FINRA’s complaint program investigates misconduct by brokerage firms and their registered representatives; through it, FINRA can impose fines, suspensions, and industry bars.10FINRA. File a Complaint The SEC’s Tips, Complaints, and Referrals system handles reports of potential federal securities law violations.11U.S. Securities and Exchange Commission. Welcome to Tips, Complaints, and Referrals
After you submit, you get a confirmation and tracking number. Review takes weeks to months depending on the complexity of the trading data. Regulators may follow up for additional evidence or interviews. Keep copies of everything you send.
What You Can Recover in Arbitration
Most churning disputes are resolved through FINRA arbitration because brokerage account agreements almost universally require it. Damages typically include:
- Excess commissions — the difference between what you paid and what would have been reasonable for the account.
- Trading losses on unnecessary transactions the broker executed to generate fees.
- Lost opportunity costs — what the money would have earned in an appropriate strategy over the same period.
- Pre-judgment interest on the above.
- Punitive damages in cases of particularly egregious or intentional misconduct, though arbitration panels award them less frequently than compensatory damages.
FINRA reports that arbitration cases that settle typically resolve in about 12 months. Cases that go to a full hearing average around 16 months, with the award issued within 30 days after the hearing concludes.12FINRA. FINRA’s Arbitration Process
A securities attorney and a forensic accountant to analyze the trading patterns will strengthen the case. Expert analysis of turnover and cost-to-equity is often the centerpiece of a churning arbitration. Forensic accountants in securities cases typically charge $250 to $800 per hour, so weigh that cost against the potential recovery.
The Firm May Be Liable Too
Churning is not just the individual broker’s problem. FINRA Rule 3110 requires every brokerage firm to maintain supervisory systems designed to detect and prevent violations, including excessive trading.13FINRA. FINRA Rule 3110 – Supervision Firms must have a registered principal review securities transactions in writing and must periodically examine customer accounts for irregularities.
Firms that ignore red flags — high turnover across multiple accounts handled by the same broker, a pattern of customer complaints, exception reports that nobody reviewed — share liability for the resulting losses. That matters practically, because a firm’s deeper pockets often make it the more realistic target for recovering damages. When you file, naming both the individual broker and the firm gives you the strongest position.