A market maker quotes a stock at fifty dollars bid and fifty dollars and five cents ask. Over a morning it buys 2,000 shares from sellers at its bid and sells the same 2,000 shares to buyers at its ask, its quotes unchanged throughout. What gross revenue has the round trip produced?

$100, five cents on each of the 2,000 shares bought at the bid and resold at the ask

$200, five cents on each of the 4,000 shares that passed through its hands, counting the buying and the selling legs

$50, half the five-cent spread on each of the shares, the other half of the spread being passed on to the exchange

Nothing yet, since spread revenue is booked only once the shares have been held in its inventory overnight

Picture a market with no market makers, in which a seller wants to liquidate a position straight away. What does the seller face, and what does a market maker supply in its place?

A forced sale at the last trade price; a market maker guarantees that the seller receives that last trade price in full

A wait for a natural buyer at an acceptable price; a market maker trades at once, holding the position itself

A fixed delay of one settlement cycle; a market maker lends the seller cash until the eventual buyer settles the trade

A once-daily exchange auction; a market maker publishes that auction's clearing price to the seller in advance of it

A large-capitalisation stock trading at about eighty dollars is already quoted one cent wide by dozens of competing market makers. Several more firms now begin making markets in it. What happens to the spread?

It widens, because the added market makers split the order flow and each one then carries more inventory risk per share traded

It narrows below one cent, since competition among the added market makers meets no regulatory floor on quoted prices in a large stock

It stays at one cent, the minimum quoting increment that Regulation NMS Rule 612 sets for a stock at that price

It narrows to half a cent, as sub-penny quoting is permitted once a stock has several market makers competing for its order flow

A FINRA member enters proprietary quotations for OTC equity security A in an inter-dealer quotation system. It also trades OTC equity security B now and then for customers but displays no market making interest in B. What is its status in security B?

It is not an OTC market maker in B, the status attaching only to securities where it displays market making interest

It is an OTC market maker in B as well, since quoting any one OTC equity security makes it a market maker in all of them

It is an OTC market maker in B only if B is carried on the same inter-dealer quotation system on which it quotes A

It is an exchange market maker in B, OTC securities without its own quotations being assigned to the exchange category by default

A proprietary trading firm that is registered with no regulator plans to begin posting continuous two-sided quotations in several equity securities. What must be in place before it may make markets in them?

Registration as an investment adviser under the Advisers Act, plus a notice filed with each exchange listing the securities

Broker-dealer registration with the SEC under Exchange Act Section 15, FINRA membership, and registration in each security

FINRA membership on its own, membership standing in for broker-dealer registration with the SEC under Section 15

Written consent from each issuer, plus a net capital deposit lodged with the clearing corporation for each security

On the NYSE, what affirmative obligation does a designated market maker carry in the securities assigned to it?

To refrain from trading for its own account in any of its assigned securities, so that its quotations represent public agency interest only

To execute every public order in its assigned securities at the prior session's closing price, keeping prices stable throughout the whole trading day

To quote within a specified proximity of the national best bid and offer during market hours, keeping the market fair and orderly

To guarantee a minimum daily volume in each assigned security, buying any shortfall for its own account in the closing auction every day

A registered market maker and an ordinary dealer both buy and sell securities for their own account. What does registration as a market maker oblige the firm to do that the dealer need not?

Execute customer orders at the national best bid or offer whenever one is displayed

Obtain the issuer's written consent before it begins quoting that issuer's security

Publish a closing price for each security it quotes at the end of each session

Maintain continuous two-sided quotations at firm prices throughout regular market hours

Under Regulation NMS, a market maker is displaying a bid of thirty dollars for 1,200 shares. A seller presents an order to sell 900 shares. What must the market maker do?

Buy all 900 shares at thirty dollars, since the order falls within the size its bid displays

Buy 100 shares at thirty dollars, then the rest lower, a single round lot being all a bid commits it to

Buy the 900 shares at a lower price, its displayed bid binding only on orders for the full 1,200 shares

Buy the 900 shares at thirty dollars only if it can resell them at its ask before the trade settles

When a market maker's inventory in a stock builds up on one side, as when sellers keep hitting its bid and few buyers arrive, how does it typically use its quotations to manage the imbalance?

It adjusts its bid and ask to attract still more sellers, so as to lower the average cost of the position it holds

It adjusts its bid and ask to attract buy orders that will offset the position it has built up

It passes the excess position to the clearing corporation, which carries the shares until offsetting buyers arrive

It increases only the size of its bid, committing to buy a larger number of shares at the same unchanged price

A market maker quoting twenty dollars bid and twenty dollars and two cents ask buys 5,000 shares at its bid. Before it can sell them the price falls, and it eventually sells all 5,000 at $19.90. What is the outcome on the 5,000 shares?

A loss of $600, the ten-cent fall plus the two-cent spread it gave up on every share

A gain of $100, the two-cent spread being earned on each share whatever the price later does

A loss of $500, the ten-cent fall in price outweighing any spread it had hoped to earn

No gain or loss, its inventory being carried at the bid price until every share is sold

How do the high-frequency firms that dominate modern equity market making keep their spreads tight while still controlling inventory risk?

Their quotes are exempt from the firm quote obligation, so they may refuse orders whenever prices move

They hedge every share they buy with an offsetting option, so that price moves never reach their inventory

They trade only against orders already matched on the other side, so that they never hold any inventory

Their algorithms re-price quotes in microseconds and reposition quickly, instead of relying on wide spreads

An investor wants to buy a thinly traded security quoted on an OTC Markets Group platform, where a single firm makes a market. Why does that firm's role matter more than a market maker's in an exchange-listed stock?

No central order book or matching mechanism exists, so its quotation is the only visible price

Its quotation binds the issuer, which is always obliged to repurchase the shares at that quoted price whenever an investor asks

Its quotations are exempt from best execution, so investors there must accept whatever price the firm names

Its quotations are guaranteed by FINRA, which compensates any investor if the quoted price proves to be wrong

FINRA Rule 6460 requires an OTC market maker displaying quotations in an inter-dealer quotation system to publish customer limit orders priced better than its own quote. What practice is that display obligation designed to stop?

Trading for its own account ahead of a customer's limit order at the same price or better while that order sits unexecuted

Internalising customers' orders at prices worse than they specified while showing the public only its own less competitive quote

Charging the customer a commission on top of the limit price whenever it fills the order out of its own inventory

Filling customers' limit orders in the order of their size rather than in the order in which they arrived at the firm

A firm registers as a market maker in one particular options class on Cboe. What does that registration commit it to?

Quoting two-sided markets in that class's contracts at prices set for it by the Options Clearing Corporation

Quoting two-sided markets in that class only at the opening and closing rotations, leaving the rest of the day to customer orders

Quoting two-sided markets in that class's contracts during trading hours, so traders can open and close positions

Quoting two-sided markets in that class and in its underlying stock, so that its option quotes are always hedged

Why is managing risk harder for an options market maker than for an equity market maker?

Its quotes must be held for a full trading session, so it cannot re-price them as the underlying stock moves

Its positions are marked to market only at expiration, so any losses stay hidden until the contracts expire

It may not hedge with the underlying stock, so each option it buys must be offset by selling another option

Its positions carry delta, gamma, vega and theta exposure, hedged dynamically with the stock and other options

Firm A buys and sells a stock for its own account whenever it sees an opportunity, posting no standing quotation. Firm B stands ready every trading day to buy and sell the stock at prices it publishes. Which of them fits the SEC's description of a market maker?

Firm A, since the SEC describes any firm that trades a stock for its own account rather than as agent for its customers

Firm B, since the SEC describes a firm ready to buy and sell regularly and continuously at a publicly quoted price

Both of them, since the SEC describes any firm that buys and sells the same stock for its own account, however often

Neither of them, since the SEC's description requires a firm to hold a minimum inventory of the stock at the close every day

A market maker quotes a stock at forty dollars bid and forty dollars and four cents ask. An investor wants to sell 300 shares to it at once. At what price does the market maker buy?

At forty dollars and four cents, the ask being the price at which a market maker buys from sellers

At forty dollars and two cents, the midpoint at which a market maker fills an order it takes at once

At forty dollars, the bid being the price at which the market maker stands ready to buy the stock

At a price it fixes after the order arrives, its published quotes serving only as an indication of interest

A stock is quoted at twenty dollars bid and twenty dollars and three cents ask. An investor buys 400 shares at the ask and, a moment later, sells all 400 back at the bid, the quotes unchanged. What has the round trip cost the investor, and why?

$24, the three-cent spread being charged once on the purchase and then again on the sale

Nothing, since an investor who sells back at once is refunded the spread it paid on the purchase

$6, half the spread on each share, the other half of it being borne by the market maker

$12, the three-cent spread on each of the 400 shares being the investor's cost of transacting

An OTC security has only one or two market makers and is quoted with a spread of several percent. What does a spread that wide indicate?

A less liquid market, with few market makers competing in it or more inventory risk for them to carry

A market so competitive that the market makers have driven their quotes as far apart as the rules allow

A security in which market makers are paid a fixed fee by the issuer for every round trip they complete

A security close to delisting, the spread being set by FINRA to deter any further trading in it

FINRA's trading rules define two kinds of market maker. What makes a member an exchange market maker under FINRA Rule 6320B, as against an OTC market maker under FINRA Rule 6420?

Entering proprietary quotations for a security in an inter-dealer quotation system on a regular basis

Membership of an exchange together with trading at least once a day in each of the exchange's listed securities

Designation by FINRA as the dealer responsible for a listed security's opening price on each trading day

In which securities do OTC market makers make markets?

Securities listed on a national exchange, traded by the OTC market maker on the exchange's own floor

Securities issued by FINRA member firms, which may not be listed on a national exchange at all

Government and municipal securities alone, equity securities being reserved to exchange market makers

Securities not listed on a national exchange, including OTC equity securities traded through FINRA's OTC systems

Another venue displays the national best offer in a stock at $10.00. A trading venue is about to execute a customer's buy order at $10.02. What does Regulation NMS Rule 611 require of the venue?

That it prevent the trade-through, an execution at a price inferior to the national best offer

Nothing, since Rule 611 binds market makers' own quotations and does not reach a venue's executions

That it tell the customer, after the trade, that a better price was then available at another venue

That it execute at $10.02 and then pay the customer the two-cent difference out of its own account

A market maker displays a bid of fifty dollars for 1,000 shares. A seller presents an order to sell 1,600 shares. What does the Firm Quote Rule oblige the market maker to do?

Buy all 1,600 shares at fifty dollars, its bid binding it for any order a seller presents

Buy 1,000 shares at fifty dollars, the displayed size marking the limit of its obligation

Buy none of the shares at fifty dollars, the order being larger than the size it displayed

Buy 1,000 shares at a price below fifty dollars, since the order exceeds its displayed size

Why does it matter to investors that market makers must honour the quotations they display?

It fixes the closing price of each stock, which investors then use to value the holdings they keep

It stops market makers earning any spread, since every quotation must be executed at their cost

It makes displayed prices genuine, so investors can rely on them when deciding where to route orders

It lets investors cancel trades done at a displayed price that later proves to have been wrong

A market maker keeps its quotes and its spread unchanged, but far fewer orders now arrive at those quotes. What happens to its spread revenue, and why?

It is unchanged, the revenue being fixed by the width of the spread and not by the orders arriving

It rises, since fewer orders mean less inventory risk and so more of each spread is kept

It is unchanged, since the exchange pays a market maker a set fee for each hour it quotes

It falls, the revenue model depending on the volume of orders that arrive at its quotes

Buyers keep lifting a market maker's ask while few sellers arrive, so that it has sold far more of a stock than it has bought. How does it use its quotations to correct that imbalance?

It stops quoting an ask at all until enough sellers have arrived of their own accord to rebalance it

It adjusts its bid and ask to attract sell orders that offset the imbalance it has built up

It asks the exchange to halt trading in the stock until the imbalance in its own position has cleared

It keeps its quotes exactly as they were, the imbalance correcting itself once the price has moved

An OTC market maker displays a bid of $2.10 for a security in an inter-dealer quotation system. A customer gives it a limit order to buy at $2.13. What does FINRA Rule 6460 require of the market maker?

Nothing until its own bid reaches $2.13, a customer limit order being held privately until then

That it fill the order from inventory at once at $2.13, the rule leaving its displayed bid unchanged

That it publish at once a bid at $2.13 reflecting the customer's order, above its own $2.10 bid

That it pass the order to another market maker displaying a better bid rather than show it itself

What does the complexity of options market making demand of the firms that undertake it?

A separate exchange membership for each underlying stock it hedges, and a licence from each issuer

A commitment to quote the underlying stock as well as the options, and a fixed daily trading volume

Prior exchange approval for each position it takes, and a daily report of its hedges to the issuer

Sophisticated risk management systems and substantial capital, since the exposures must be hedged dynamically

Market Maker: Quotes, Spreads and Regulatory Duties

What Is a Market Maker?

A market maker is a broker-dealer firm that continuously quotes both a bid price — the price at which it will buy a security — and an ask price — the price at which it will sell — for a specified number of shares, standing ready to execute transactions on either side of the market at those prices and thereby providing the continuous liquidity that allows investors to buy and sell securities quickly without having to search for a willing counterparty.

The SEC defines a market maker as a firm that stands ready to buy and sell stock on a regular and continuous basis at a publicly quoted price. Market makers are the primary mechanism through which liquidity is created in securities markets, and their regulation, obligations, and role in price discovery are tested throughout the SIE and Series 7 examination curricula.

The Economic Function of Market Making

Every securities transaction requires a buyer and a seller to agree on a price at the same moment. In a world without market makers, a seller who wished to liquidate a position would need to wait — potentially for a long time — until a natural buyer appeared in the market at an acceptable price.

This waiting introduces uncertainty, delays, and the possibility that price gaps widen dramatically between transactions. Market makers solve this matching problem by interposing themselves continuously between buyers and sellers, holding inventory on their own balance sheets and standing ready to transact immediately on either side.

The market maker profits from the bid-ask spread — the difference between the price at which it buys and the price at which it sells. If a market maker quotes a stock at a bid of fifty dollars and an ask of fifty dollars and five cents, each round-trip transaction in which the market maker buys at the bid and sells at the ask generates five cents of gross revenue per share. This spread is the compensation the market maker receives for providing immediacy — the ability for investors to transact now at a known price rather than waiting for a natural counterparty.

The bid-ask spread is simultaneously the market maker’s revenue and the investor’s transaction cost. Narrow spreads indicate highly competitive, liquid markets in which multiple market makers compete vigorously for order flow. Wide spreads indicate less liquid markets with fewer competing market makers or with securities that carry higher inventory risk.

For large-cap equities with dozens of competing market makers, spreads of one cent — the minimum increment under Regulation NMS Rule 612 — are common. For thinly traded OTC securities with only one or two market makers, spreads of several percent may be typical.

The Two Regulatory Environments — Exchange Market Makers and OTC Market Makers

Market making in the United States occurs in two distinct regulatory environments, each governed by a different set of rules and obligations, and FINRA Rule 6320B and Rule 6420 define the two categories precisely.

Exchange market makers are registered with a national securities exchange — NYSE, Nasdaq, NYSE American, or others — for specific securities listed on that exchange.

On NYSE, the designated market maker — historically called the specialist — has specific affirmative obligations to maintain a fair and orderly market in assigned securities, including the obligation to quote within specified proximity to the national best bid and offer during market hours.

FINRA Rule 6320B defines an exchange market maker in the context of FINRA’s trading rules as a member registered in a designated security as a market maker with an exchange or registered securities association.

OTC market makers operate in the over-the-counter markets, making markets in securities not listed on national exchanges — including OTC equity securities traded through FINRA’s OTC trading systems. FINRA Rule 6420 defines an OTC market maker as a FINRA member that holds itself out as a market maker by entering proprietary quotations or indications of interest for a particular OTC equity security in any inter-dealer quotation system.

A firm is an OTC market maker only in those securities in which it actively displays market making interest — registering as a market maker in one security does not impose market making obligations in another.

Any firm conducting market making activity must first register as a broker-dealer with the SEC under Section 15 of the Securities Exchange Act of 1934, which makes it unlawful for any broker-dealer to effect transactions in securities using interstate commerce without registration. Market making activity additionally requires FINRA membership and registration in the specific securities in which the firm intends to make markets.

Quotation Obligations — The Two-Sided Quote Requirement

The defining regulatory obligation of a registered market maker is the requirement to maintain continuous two-sided quotations — both a bid and an ask — at firm prices during regular market hours. This continuous quotation commitment is what separates market makers from ordinary dealers who may choose when to offer to buy or sell. The market maker is obligated to trade at its quoted prices when orders arrive, up to the size of its quoted quotation.

Under Regulation NMS — specifically SEC Rule 602, the Firm Quote Rule — market makers and exchanges must honour their displayed quotes up to the displayed size. A market maker displaying a bid of fifty dollars for one thousand shares must buy up to one thousand shares at fifty dollars from any seller who presents an order. The firm quote obligation ensures that displayed prices are genuine and that investors can rely on them when routing orders.

The National Best Bid and Offer — universally abbreviated NBBO — is the consolidated best bid and best ask across all exchanges and trading venues at any given moment, computed from the quotations of all registered market makers and displayed by the securities information processors under Regulation NMS Rule 603. Regulation NMS Rule 611 — the Order Protection Rule — requires trading venues to prevent trade-throughs, ensuring that executions do not occur at prices inferior to the NBBO. Market makers are not required to quote at the NBBO itself: their continuous two-sided quotations must stay within a designated percentage of the national best bid and offer, and Rule 611 keeps executions from occurring at inferior prices while better protected prices are available at competing venues.

Market Maker Profit — The Spread and Inventory Risk

Market makers earn revenue from the bid-ask spread but bear significant inventory risk in the process. When a market maker buys a security at the bid, it adds that security to its inventory. If the price subsequently falls before the market maker can sell at the ask, it suffers a loss on the inventory position. Market makers therefore manage their inventories dynamically — adjusting bid and ask prices to attract order flow that reduces their inventory imbalances, widening spreads when inventory accumulates on one side to attract offsetting orders.

The revenue model depends critically on order flow — the volume of buy and sell orders that arrive at the market maker’s quotes. High-frequency trading firms dominating modern equity market making compete on speed — their algorithmic systems can adjust quotes in microseconds in response to new information, allowing them to provide tight spreads while managing inventory risk through rapid repositioning rather than through wide spreads.

Citadel Securities, Virtu Financial, and similar electronic market making firms account for the substantial majority of quoted liquidity in United States equity markets, having largely displaced the traditional specialist and dealer systems that characterised markets before the widespread adoption of electronic trading. NYSE’s paper on market making confirms that for the most active large-cap stocks with very deep order books, market making is effectively automated and competitive to the point where spreads reach the minimum one-cent increment regardless of market maker obligations.

Market Makers and the OTC Bulletin Board

In the OTC markets for smaller and less liquid securities — including OTC Bulletin Board securities and securities quoted on OTC Markets Group platforms — market makers play an especially critical role because there is no exchange providing a centralised order book and matching mechanism. The OTC market maker provides the only visible price for investors seeking to buy or sell these securities.

FINRA Rule 6460 requires OTC market makers displaying quotations in inter-dealer quotation systems to publish immediately bids and offers that reflect customer limit orders at better prices than the market maker’s own displayed quotation, ensuring that customer price improvement is incorporated into the displayed market. This limit order display obligation prevents market makers from internalising customer orders at prices worse than those customers have specified while displaying only the market maker’s own less competitive prices to the public.

Market Makers in the Options Market

The options market has its own market maker structure administered by the Options Clearing Corporation and the options exchanges — Cboe, NYSE American, Nasdaq PHLX, and others. Options market makers register in specific options classes and commit to quoting two-sided markets in those contracts during trading hours, providing the liquidity that allows options traders to open and close positions at displayed prices.

Options market makers manage significantly more complex risk than equity market makers because options positions create exposure across multiple dimensions — delta, gamma, vega, and theta — that must be hedged dynamically using the underlying stock and other options. The complexity of options market making requires sophisticated risk management systems and substantial capital.

Examination Relevance and Key Takeaways

Market makers are tested on the SIE, Series 7, and Series 65 examinations in the context of market structure, price discovery, the bid-ask spread, OTC markets, and the regulatory framework governing quotation obligations.

The key points to retain are these.

A market maker is a broker-dealer that continuously quotes both a bid and an ask price for a security, standing ready to buy at the bid and sell at the ask, providing liquidity by interposing itself between buyers and sellers rather than waiting for natural counterparties to match. Market makers profit from the bid-ask spread — the difference between the bid and the ask — and bear inventory risk from the securities they hold while waiting to complete the round-trip transaction.

All market makers must register as broker-dealers under Section 15 of the Securities Exchange Act of 1934 and must be FINRA members.

Exchange market makers are registered with specific national securities exchanges under FINRA Rule 6320B. OTC market makers are defined under FINRA Rule 6420 as FINRA members displaying proprietary quotations in OTC equity securities through inter-dealer quotation systems.

The Firm Quote Rule under Regulation NMS Rule 602 requires market makers to honour their displayed quotes at the displayed size when orders arrive. Regulation NMS Rule 611 — the Order Protection Rule — prevents trade-throughs by requiring that executions not occur at prices inferior to the NBBO, which consolidates the best bid and ask across all trading venues.

The bid-ask spread represents the market maker’s gross revenue and the investor’s transaction cost — narrower spreads indicate more competitive, liquid markets while wider spreads reflect greater inventory risk or less competition.