In criminal law, intent separates a murder charge from manslaughter. On the SIE exam, understanding intent is what separates a passing score from a failing one when it comes to prohibited practices like market manipulation. The test doesn't just ask if an action happened; it asks if you can spot the unethical motive behind it.
FINRA's prohibited practices on the SIE exam test your judgment on rules preventing market manipulation, insider trading, misrepresentation, and unethical client interactions. Key areas include FINRA Rules 2010 (Ethical Conduct), 2111 (Suitability), and 2210 (Communications), with a focus on applying them to real-world scenarios.
Key facts
- Governing Body
- FINRA (Financial Industry Regulatory Authority)
- Key Rules Tested
- FINRA Rule 2010 (Standards of Commercial Honor), Rule 2111 (Suitability), Rule 2210 (Communications with the Public)
- Primary Standard of Conduct
- Regulation Best Interest (Reg BI) for recommendations to retail customers.
- Exam Structure
- 75 scored multiple-choice questions.
- Exam Validity
- Your SIE passing result is valid for four years.
- Official Source
- Candidates should always verify current rules and exam details at finra.org.
The Modern Standard: Regulation Best Interest (Reg BI) vs. Suitability
A major point of confusion for candidates is the difference between suitability and the current standard of conduct. The SIE exam expects you to know both, but you must know which one governs.
Regulation Best Interest (Reg BI) is the primary standard broker-dealers and their representatives must follow when recommending any securities transaction or investment strategy to a retail customer. It requires them to act in the customer's best interest and not place their own financial interests ahead of the customer's. Suitability (FINRA Rule 2111) requires a broker to have a reasonable basis to believe a recommendation is suitable for a customer based on their investment profile. While still a core concept, suitability is now a component of the broader and more stringent Reg BI obligation. For the exam, if a question involves a recommendation to a retail client, think Reg BI first.This isn't just a technicality. It's a shift in mindset from "Is this product appropriate?" to "Is this the best course of action for this specific client?"
Studying for SIE? Benchmark your score in 5 minutes.
Get an instant weak-spot assessment and a custom 12-week study plan PDF generated for your exam window.
FINRA's Core Prohibited Practices: Beyond the Rulebook
The SIE exam presents these rules in scenarios. Your job is to connect a specific action to the rule it violates. Don't just memorize the list; understand the harm each rule is designed to prevent. Try VoraPrep's free SIE practice questions to see how these scenarios are built.
Insider Trading: The Misuse of Confidential Information
Insider trading is using material, non-public information (MNPI) to make a trade or to tip off someone else who trades. "Material" means the information would likely impact a company's stock price if it were public.
The core of the violation is the unfair advantage. It damages market integrity by creating a playing field where insiders can profit from information that is unavailable to the public.
Market Manipulation: Distorting Reality for Profit
These are actions designed to deceive other market participants by artificially affecting a security's price or volume. These schemes distort prices and destroy investor trust.
- Pump and Dump: Hyping up a stock (often a thinly traded microcap) with false or misleading statements to inflate its price, then selling shares at the artificially high price.
- Front-Running: A firm or rep executing a trade for their own account with advance knowledge of a large pending customer order that will likely move the market.
- Marking the Close/Open: Placing a flurry of trades at the very end or beginning of the trading day to influence the reported closing or opening price of a security.
- Wash Sales: Simultaneously buying and selling the same security in different accounts to create the illusion of activity, with no actual change in beneficial ownership.
Churning (Excessive Trading): Generating Commissions, Not Returns
Churning is excessive trading in a client's account, driven by the rep's desire to generate commissions rather than to achieve the client's investment goals. It is a breach of the duty of fair dealing.
A retired client, Maria, has a $200,000 portfolio with an objective of "capital preservation and income." Her rep, Tom, executes 50 trades in her account over a year, generating $15,000 in commissions. The account's total return for the year, before commissions, was $10,000.
Analysis:- Client Objective: "Capital preservation and income" implies a conservative, low-turnover strategy.
- Trading Frequency: 50 trades is extremely high for this objective.
- Cost vs. Return: Commissions ($15,000) consumed the entire portfolio gain ($10,000) and resulted in a net loss of $5,000.
Misrepresentations and Guarantees: Selling False Hope
This is a straightforward but critical rule. Registered reps cannot make false or misleading statements about products or performance.
This includes an absolute prohibition on guaranteeing a customer against loss or promising a specific return. Securities involve risk, and suggesting otherwise is a serious violation.
Sharing, Borrowing, and Lending: Blurring Professional Lines
These rules exist to prevent conflicts of interest and potential exploitation of clients.
- Sharing in Accounts: Generally prohibited. The only exception requires written permission from both the customer and the firm, and the sharing of profits and losses must be directly proportional to the financial contributions made by the representative.
- Borrowing & Lending: Also generally prohibited. Limited exceptions exist if the customer is a financial institution in the business of lending, a family member, or if the firm has written procedures permitting such arrangements based on a pre-existing personal relationship.
Selling Away: Unauthorized Private Securities Transactions
"Selling away" is when a rep conducts a securities transaction for a client outside the knowledge and supervision of their employing firm.
- If compensation is received: The rep must get prior written approval from the firm, and the firm must supervise the transaction as if it were its own.
- If NO compensation is received: The rep must still provide prior written notice to the firm. Failure to notify is a violation. The firm may still require adherence to certain conditions.
Calculate Your SIE Score & Study Hours by Domain
Adjust your practice scores across official SIE blueprint domains to predict your pass probability and generate a domain-weighted study schedule.
Decoding FINRA's Communications Rules (FINRA Rule 2210)
FINRA Rule 2210 ensures that all communications with the public are fair, balanced, and not misleading. The rules hinge on the audience.
The Three Categories of Communication
- Retail Communication: Any written communication sent to more than 25 retail investors within 30 days. This is the broadest category and requires pre-approval by a registered principal of the firm before use.
- Correspondence: Any written communication sent to 25 or fewer retail investors within 30 days. It does not require principal pre-approval but is subject to the firm's supervision and review.
- Institutional Communication: Any communication distributed only to institutional investors. It does not require principal pre-approval but is subject to internal supervisory review.
An "institutional investor" includes banks, insurance companies, registered investment companies, and any entity with total assets of at least $50 million. A high-net-worth individual does not qualify as an institutional investor under this rule.
Approval and Recordkeeping at a Glance
| Communication Type | Audience | Principal Pre-Approval | Recordkeeping |
|---|---|---|---|
| Retail Communication | > 25 retail investors in 30 days | Required | 3 years |
| Correspondence | ≤ 25 retail investors in 30 days | Not required (but subject to review) | 3 years |
| Institutional Communication | Institutional investors only | Not required (but subject to review) | 3 years |
For a full breakdown of the exam structure, see our guide on the SIE Exam Cost, Registration & Form U4 Requirements (2026 Guide).
How to Master Prohibited Practices for the Exam
Success on this part of the SIE exam comes from active practice, not passive reading.
- Focus on the "Why": For every rule, ask what harm it prevents. This helps you apply the principle to unfamiliar scenarios.
- Drill Scenarios: The best way to learn is by doing. VoraPrep's adaptive learning engine has over 1,400 practice questions that force you to make judgment calls on these exact topics.
- Master the Thresholds: Know the key numbers cold: "more than 25 retail investors," "$50 million in assets for an institution," etc. These numbers are often the deciding factor in a question.
- Use Vory: If you get a question wrong, don't just read the explanation. Ask our 24/7 tutor, Vory, to walk you through the reasoning step-by-step until you understand the underlying principle.
VoraPrep is a complete, 6-pillar interactive course designed to build this kind of deep understanding, moving you beyond simple memorization to true mastery.
Ready to Pass Your SIE Exam? Don't leave your SIE success to chance. VoraPrep offers a complete 6-pillar interactive course with textbook-grade lessons, thousands of adaptive practice questions, 1:1 exam simulators, and Vory, your 24/7 personal tutor. Start building your expertise today. Visit voraprep.com to get started. Start Your Free 14-Day Trial at voraprep.com →