FINRA SIE market structure practice

Market structure is the operating map behind a securities transaction. A company may issue a security to raise capital, investors may trade it later, a broker-dealer may route a customer order, a market center may execute it, and clearing and settlement systems complete the exchange of securities and money. SIE questions test whether you can identify each role and reason from the facts given. The best preparation is to keep the stages separate: issuance, secondary trading, execution, clearing, and settlement are connected, but they are not synonyms.

Primary and secondary markets answer different questions

A primary market transaction creates or distributes a security. In a public offering, an issuer sells new shares or bonds to investors and receives proceeds, subject to underwriting and offering terms. The underwriter helps distribute the securities and may purchase them from the issuer under a firm commitment or use another arrangement. In a secondary market transaction, one investor sells an already issued security to another. The issuer generally does not receive the resale proceeds. A company's shares can trade actively every day without the company receiving money each time a shareholder sells.

This distinction applies beyond common stock. A newly issued corporate bond is sold in the primary market. An investor selling that bond to another investor later is a secondary-market transaction. A municipal bond offering also begins in the primary market, while subsequent trading occurs between investors through broker-dealers. The instrument's identity does not determine the market stage; the question is whether this transaction is the original issuance or a later resale.

An initial public offering is a first public distribution of an issuer's equity. A follow-on offering may distribute additional newly issued shares from the company, while a secondary offering may involve existing holders selling shares. Read the fact pattern: proceeds going to the issuer point toward an issuer sale; proceeds going to an existing shareholder point toward a resale. Underwriting describes distribution and risk allocation, not every later trade in the security.

Exchanges, OTC markets, and market participants

A securities exchange is an organized marketplace with listing and trading rules. It brings buyers and sellers together through a trading system and may use specialists or designated market makers for certain functions. Exchange listing rules concern matters such as issuer standards and disclosure. A stock listed on an exchange can still be traded through multiple market centers under applicable routing and best-execution obligations.

The over-the-counter market is a decentralized dealer market rather than one physical exchange floor. Broker-dealers may quote prices and transact from their own inventory or match interest. Many corporate bonds trade OTC. A dealer can act as principal when trading for its own account, or as agent when arranging a transaction for a customer. The capacity matters: a principal transaction is the firm's trade against the customer; an agency transaction places the firm between customer interest and another party without making the firm the economic counterparty in the same way.

A market maker stands ready to buy and sell a security by publishing quotations, subject to the applicable market and regulatory framework. A market maker's bid is the price it is prepared to pay to buy; its ask or offer is the price at which it is prepared to sell. The bid is normally below the offer. The difference is the spread. A dealer buying at the bid and selling at the offer may earn the spread, but the spread is not guaranteed profit: inventory can move in value, trades may occur at different prices, and the dealer carries risk.

A broker acts as an intermediary for customer orders. A broker-dealer can perform both broker and dealer functions in different transactions. Do not assume that every order goes directly to an exchange, that every dealer is a market maker in every security, or that a market maker guarantees a particular price. A market center can execute an order, but execution quality depends on price, speed, size, likelihood of execution, and other relevant circumstances.

Read quotations and order instructions carefully

Suppose a stock is quoted at 24.90 bid and 25.05 offer. A customer who buys at the displayed offer would pay 25.05 per share before any applicable charges. A customer selling at the displayed bid would receive 24.90 per share before charges. The 0.15 spread is a cost embedded in the quoted prices. A quote is not a promise that an order of any size will execute there. Available quantity, market movement, venue, and order handling affect the result.

A market order prioritizes execution. It tells the broker to buy or sell promptly at the best prices available under the circumstances. It does not guarantee a particular price. In a fast or thin market, an order can execute at more than one price, and the final average may differ from the quote seen when the order was entered. A market order is often appropriate when execution matters more than price certainty, but it is not automatically the right choice for every investor.

A limit order sets a maximum purchase price or minimum sale price. A buy limit at 25 means the customer will not pay above 25, though execution may occur at 25 or less. A sell limit at 25 means the customer will not sell below 25, though execution may occur at 25 or more. A limit order controls price but does not guarantee execution. The market may never reach the limit, or a queue of orders at the same price may be ahead of it.

A stop order becomes a market order after the stop price is reached or passed under the order's activation rules. A sell stop is commonly placed below the current market; a buy stop is commonly placed above it. Once triggered, the market order can execute away from the stop price, especially during a gap or rapid move. A stop price is a trigger, not a guaranteed execution price. A stop-limit order instead becomes a limit order at the trigger, so it can control the worst acceptable price but may remain unexecuted.

Time-in-force instructions describe how long an order remains active. A day order ordinarily expires at the end of the trading day if not executed. A good-till-cancelled order remains open under the broker's procedures until filled or canceled, though firms may impose a maximum duration or other handling rules. Immediate-or-cancel instructions seek immediate execution for all or part of an order and cancel the remainder; fill-or-kill instructions generally require immediate execution of the entire order or cancellation. The exact permitted order types and handling conventions can vary by market and firm, so focus on the stated instruction in the question.

A short sale is generally the sale of a security the seller does not own or has borrowed for delivery, with an obligation to return the borrowed security. The investor seeks to buy it back later, ideally at a lower price. If the price rises, losses can be substantial because there is no fixed ceiling on the market price. Short sales are subject to borrowing, locate, delivery, and regulatory requirements. Do not confuse a short sale with a long sale of securities already owned.

Execution, clearing, and settlement are separate stages

Execution occurs when the buyer and seller agree to a trade under the market's rules. Confirmation records the trade details for the customer, such as security, quantity, price, capacity, and transaction date. Clearing identifies obligations between participants, nets trades where applicable, and manages the process for completing them. Settlement is the final exchange of securities and funds. A trade can be executed before it settles; ownership and payment obligations are not complete merely because an order has filled.

For most U.S. broker-dealer securities transactions, the standard settlement cycle is T+1: settlement generally occurs one business day after the trade date. The cycle is a general rule, not a guarantee that every transaction follows the same calendar pattern. Weekends, market holidays, security type, and exceptions matter. If a customer sells shares on Friday and there is no intervening holiday, standard settlement is generally Monday. If Monday is a market holiday, the next business day generally becomes the settlement date.

Clearing agencies and depositories support the movement and recordkeeping of securities. A central counterparty can interpose itself between trading parties, becoming buyer to each seller and seller to each buyer, which helps manage counterparty exposures under its rules. A securities depository holds securities in book-entry form and supports transfers between participants. Investors usually see positions through their brokerage statements, while the clearing and depository infrastructure processes obligations behind the scenes.

Margin is credit from a broker-dealer to a customer for securities transactions, secured by assets in the account. It can magnify gains and losses. A maintenance deficiency may lead to a call or liquidation under applicable rules and the firm's agreement. A cash account requires payment in full for purchases under the settlement rules. SIE questions may connect account type with trading behavior, so do not confuse a market mechanism with the customer's funding arrangement.

Original SIE-style market structure questions

Question 1: Identify the market

An investor buys newly issued shares in an offering, and the company receives the offering proceeds. What market is involved?

Answer: Primary market. The issuer is selling newly issued securities and receiving proceeds. If the investor later sells those shares to another investor, that later transaction is in the secondary market. The company does not receive the ordinary resale proceeds.

Question 2: Interpret the quote

A dealer displays 41.20 bid and 41.34 ask. A customer places a market order to buy 300 shares, and those shares execute at the displayed ask. What is the trade value before charges, and what is the spread?

Answer: The purchase value is 300 × 41.34 = 12,402. The spread is 41.34 - 41.20 = 0.14 per share. The bid is what the dealer is prepared to pay to buy; the ask is what the dealer offers when selling. A market order does not guarantee this price in a changing market, so the question's execution fact is what allows the calculation.

Question 3: Distinguish limit from market

A customer enters a buy limit at 18.50 while the stock is trading at 18.72. What has the customer controlled, and what remains uncertain?

Answer: The customer will not pay more than 18.50 under the stated order. Execution is uncertain because the market may not fall to the limit, and other orders may be ahead at that price. The limit sets a maximum purchase price; it does not promise a fill.

Question 4: Stop price versus fill price

A customer owns a stock at 52 and enters a sell stop at 47. After adverse news, the stock opens at 43 and trades lower. Why can the customer receive less than 47?

Answer: When triggered, the stop becomes a market order. Because the market has moved below 47, execution occurs at available prices and may be below the stop. The stop is an activation level, not price protection. A stop-limit order could restrict the minimum sale price, but that order might not execute.

Question 5: Calculate settlement

A regular-way U.S. stock trade takes place on Tuesday, with no intervening market holiday. Under the standard T+1 cycle, when does it generally settle?

Answer: Wednesday, one business day after Tuesday. T+1 counts business days, not simply the next calendar day. A weekend or market holiday changes the calendar date, and particular instruments or transactions can follow exceptions.

Question 6: Principal or agency

A broker-dealer sells bonds from its own inventory to a customer. In what capacity is the firm acting in that transaction?

Answer: Principal. The firm is trading for its own account and is the customer's counterparty for the sale. In an agency transaction, the firm acts as intermediary to arrange a trade between the customer and another party. A firm's capacity may differ from one transaction to another.

A compact method for solving market questions

First identify the stage: issuance, order entry, execution, clearing, or settlement. Then identify the actor: issuer, investor, broker, dealer, exchange, clearing agency, or depository. Next isolate the instruction or price that controls the result. A market order controls urgency; a limit controls the worst acceptable price; a stop controls when an order activates. Finally, distinguish what is certain from what is not. A fill, price, settlement date, and investor outcome each require their own facts.

When a question includes a price, write down whether it is a bid, ask, limit, stop, or execution price before doing arithmetic. For a buyer, ask is the natural side of a dealer quote; for a seller, bid is the natural side. If the question says the order filled at another price, use that actual execution price rather than assuming the quote. Multiply price by quantity only after locating the actual trade price, and note whether the requested number is per share, total value, spread, or gain/loss.

When it asks about a guarantee, check whether the order type actually supplies one. Market orders seek execution but expose the investor to price uncertainty. Limit orders specify a price boundary but expose the investor to non-execution. Stop orders trigger action but can execute away from the stop. Stop-limit orders specify a limit after triggering but can remain open. These paired tradeoffs are common because they test whether you understand the customer's instruction instead of memorizing a label.

Finally, keep the issuer's financing separate from investor-to-investor trading. New issue means proceeds to the issuer; resale means a transfer among investors. Keep trade date separate from settlement date. A confirmation describes an executed transaction; clearing processes obligations; settlement completes the exchange. Once these distinctions are automatic, market structure questions become short applications rather than vocabulary puzzles.

Sources and related study

FINRA's current SIE content outline identifies the tested market, trading, order, and settlement concepts. The official exam overview describes the assessment. The companion pages on the SIE format and securities products provide broader context.