Bid

Definition and Overview

The bid is the highest price at which any current market participant is prepared to immediately purchase a security. In the context of a market maker's two-sided quote, the bid is the price the market maker is willing to pay to acquire the security from a seller — the price from the perspective of a buyer of the security who is standing ready to transact. In the context of an order book, the bid is the highest limit buy order currently outstanding — the most that any pending buyer has specified as their maximum purchase price.

The word bid derives from the general English sense of offering a price for something — the same word used in auctions, procurement, and contract negotiation — and its usage in securities markets carries that same meaning of a price proposal from a buyer. In every context in which it appears — dealer quote, order book, government auction, bond bid-wanted process — the bid is a price put forward by a prospective buyer, and its counterpart is always the ask or offer put forward by a prospective seller.

The Bid in Equity Markets — Market Maker Perspective

In the equity secondary market, the bid is most commonly encountered as one half of a market maker's continuous two-sided quotation. A market maker in a particular stock maintains a standing commitment to buy shares from sellers at the bid price and sell shares to buyers at the ask price throughout each trading day. The market maker is simultaneously offering to buy and offering to sell, maintaining liquidity for both sides of any potential transaction.

A market maker's bid quotation has two components — the bid price itself and the bid size. The bid price is the per-share price at which the market maker will purchase shares from a seller. The bid size is the number of shares the market maker is prepared to purchase at that price, expressed in round lots of one hundred shares. A quote showing forty dollars bid at four means the market maker will buy up to four hundred shares at forty dollars per share. A seller who presents up to four hundred shares can transact immediately at forty dollars per share without any negotiation or uncertainty.

From the customer's perspective, the bid is the price at which they can sell immediately. A customer who calls their broker and places a market sell order will receive execution at or near the prevailing bid — the highest price any current buyer will pay. Conversely, a customer who places a market buy order will pay the ask. This fundamental relationship — customers buy at the ask and sell at the bid — is one of the most basic and most tested concepts in every securities licensing curriculum.

The spread between bid and ask is the market maker's potential profit margin on a complete round trip — buying from a seller at the bid and selling to a buyer at the ask. A market maker who buys one thousand shares at a bid of forty dollars and subsequently sells those same one thousand shares at an ask of forty-one dollars earns one thousand dollars in spread income — the compensation for providing continuous, immediate liquidity to both buyers and sellers throughout the trading day.

The National Best Bid and the NBBO

In a market where multiple broker-dealers and electronic trading venues simultaneously post competing quotations for the same security, the relevant bid for regulatory and execution purposes is the highest bid across all venues — the national best bid, which together with the national best offer forms the National Best Bid and Offer, universally known as the NBBO.

The NBBO represents the best available price for an immediate transaction on either side — the highest price any current buyer will pay and the lowest price any current seller will accept — across all registered exchanges, alternative trading systems, and other trading venues that are consolidated into the national market system. Regulation NMS, adopted by the SEC in 2005 under its authority pursuant to Section 11A of the Securities Exchange Act of 1934, requires broker-dealers to execute customer orders at prices at least as favourable as the NBBO at the time of execution under the Order Protection Rule — also called the trade-through rule. A broker-dealer that executes a customer sell order at a price below the national best bid when a better price is available elsewhere violates the Order Protection Rule and its best execution obligations.

FINRA Rule 5220, the firm quote rule, requires broker-dealers that publish quotations in the over-the-counter market to honour those quotations when approached for a transaction — the published bid is a firm commitment to buy at that price, not a mere indication of interest. A broker-dealer that publishes a bid of forty dollars per share and then refuses to purchase shares at forty dollars when a seller approaches, without a valid excuse, violates the firm quote rule. Valid exceptions exist — a market maker may withdraw or adjust a quote in a fast market, may lock or cross a quote in certain circumstances, and may adjust quotes to reflect material changes in market conditions — but the general principle is that a published bid is a firm offer to buy.

The Bid in Over-the-Counter Equity Markets

In the Nasdaq market — which operates as a dealer market rather than the centralised auction market of the NYSE — multiple competing market makers each post their own bid and ask quotations for each security in which they make a market. The NBBO in a Nasdaq-listed stock reflects the highest bid among all the competing market makers and other participants who have posted limit orders to buy, consolidated across all venues. The competition among multiple market makers to be at the national best bid — to quote the highest purchase price — is a primary driver of the tight spreads that characterise actively traded Nasdaq stocks.

Electronic communications networks and alternative trading systems additionally contribute to the bid side of the market through the aggregation of limit buy orders from institutional and retail investors. When an investor places a limit order to buy one thousand shares of a stock at forty dollars per share, that order contributes to the collective bid at forty dollars — if it is the highest current buy limit order, it becomes the national best bid.

The Bid in the Fixed Income Secondary Market

In the over-the-counter bond market — the trading environment for United States Treasury securities, federal agency bonds, corporate bonds, and municipal bonds — the bid takes on additional dimensions that reflect the unique structure of fixed income markets compared to equity markets.

Bond dealers post two-sided bid and ask quotations for bonds in which they make a market, expressed as percentages of the bond's face value. A dealer quoting a corporate bond at ninety-eight bid, ninety-eight and a half ask means the dealer will purchase that bond from a seller at ninety-eight dollars per one hundred dollars of face value — paying nine hundred and eighty dollars per one-thousand-dollar bond — and will sell it to a buyer at ninety-eight dollars and fifty cents per one hundred dollars of face value. The spread of fifty cents per one hundred dollars of face value is the dealer's gross margin.

United States Treasury securities are quoted in a more precise format reflecting the high liquidity and extremely tight spreads of the Treasury market. Treasury notes and bonds are quoted in thirty-seconds of a point — a price of ninety-eight and sixteen thirty-seconds means ninety-eight and one-half of a point, or ninety-eight dollars and fifty cents per one hundred dollars. Treasury bills, as zero-coupon discount instruments, are quoted on a discount yield basis rather than a price basis, and in this context the bid and ask have an inverse relationship to price-based quoting — a higher bid yield means the dealer is willing to pay a lower price. This yield-based inversion — higher bid number corresponds to lower price — is a frequently tested distinction on securities licensing examinations.

The Bid-Wanted Process in Fixed Income

An important dimension of the bid in fixed income markets that has no direct parallel in equity markets is the bid-wanted or bid-wanted-in-competition process — a mechanism through which bond dealers solicit competing bids from other dealers on behalf of a customer seeking to sell a bond position.

When a customer instructs a dealer to sell a bond, the dealer may initiate a bid-wanted process by broadcasting to other dealers that it is soliciting bids for a specified bond in a specified quantity. Other dealers review the solicitation and submit their bids — the prices they are prepared to pay to purchase the bond. The initiating dealer collects these competing bids and presents the highest bid to its customer as the best available market price, typically providing price improvement over what a single dealer quote could deliver by introducing competition among potential buyers.

FINRA Rule 5310, the best execution rule requiring broker-dealers to use reasonable diligence to ascertain the best inter-dealer market for a security and to buy or sell in that market, specifically identifies the bid-wanted process as a mechanism for achieving best execution in the over-the-counter bond market. FINRA Regulatory Notice 20-29 addressed the practice of pennying — where a dealer that initiates a bid-wanted process on behalf of a customer then executes the trade itself at a price matching or slightly beating the highest external bid, having used the auction process solely for price discovery rather than for genuine competitive price sourcing — and identified this practice as potentially inconsistent with best execution obligations.

The Bid in Treasury and Municipal Bond Auctions

The concept of the bid in the primary market context — the initial issuance of new securities — differs fundamentally from the bid in the secondary market. In the primary market, the bid is an investor's or dealer's formal offer to purchase newly issued securities at a specified price or yield in a competitive auction process.

The United States Treasury conducts regular auctions of Treasury bills, notes, bonds, Treasury Inflation-Protected Securities, and Floating Rate Notes through a uniform-price auction process. Competitive bidders — primarily primary dealers, banks, and large institutional investors — submit bids specifying the yield they require and the amount they wish to purchase. The Treasury accepts bids beginning with those specifying the lowest yield — which corresponds to the highest price — working upward through successively higher yield bids until the full offering amount is awarded. All successful competitive bidders receive the same yield — the stop-out rate or highest yield at which the offering amount is completely filled — regardless of what they individually bid. This uniform-price or single-price format, which the Treasury has used for all marketable security auctions since November 1998, eliminates the winner's curse of the prior multiple-price format in which successful bidders paid their individually specified bids.

Non-competitive bids may also be submitted at Treasury auctions by investors agreeing to accept whatever yield is determined by the competitive bidding process, with a maximum of ten million dollars per investor per auction guaranteed to be filled in full at the stop-out yield. Non-competitive bids are set aside from the offering and filled before the competitive allocation is determined, with the remaining offering amount distributed to competitive bidders. Retail investors and smaller institutions typically bid non-competitively through TreasuryDirect, the Treasury's online platform.

Municipal bond new issues are sold through competitive bid underwriting, in which investment banking syndicates submit sealed bids — typically specifying the coupon rates and the interest cost — to the municipal issuer, which awards the issue to the syndicate offering the lowest overall cost of borrowing. The winning bidder then sells the bonds to investors at a reoffering price reflecting the underwriting spread and prevailing market conditions. FINRA rules governing the conduct of underwriters and dealers in municipal new issues apply to all aspects of the competitive bid process.

The Bid in Options Markets

In the exchange-traded options market, the bid and ask quotations work identically to the equity market structure — the bid is the highest price at which market makers or other participants will immediately purchase an options contract, and the ask is the lowest price at which they will sell it. Options spreads are typically wider than equity spreads, reflecting the lower trading volume and higher complexity of option contracts relative to the underlying stock. An option on a volatile, thinly traded underlying security may carry a bid-ask spread of fifty cents per contract or more — a substantial percentage cost relative to the option premium — while options on highly liquid indices or the most actively traded large-cap stocks may trade with spreads of one cent.

The bid in options is particularly important for investors executing complex multi-leg strategies. A customer seeking to sell an options spread consisting of two or more legs must consider the bid price for each individual leg separately, and the combined execution at the market bids for all legs simultaneously may be achievable only at prices inferior to the theoretical net bid — because each leg individually trades at a spread discount to fair value, and the combined discounts compound.

The Bid in the Context of Customer Transactions and FINRA Markup Rules

The bid price is directly relevant to the regulatory framework governing broker-dealer pricing of customer transactions in over-the-counter securities. When a broker-dealer acts as a principal in a customer sell transaction — purchasing securities from a customer for its own inventory — the price the dealer pays the customer is the bid. FINRA Rule 2121 requires that the markdown charged to the customer — the difference between the prevailing market price and the price the customer receives — be fair and reasonable and not excessive.

The prevailing market price, against which markdown fairness is measured, is determined by reference to the dealer's contemporaneous cost — the price at which the dealer recently purchased the security — or, when contemporaneous cost is not available, by reference to other indicators of current market value including competing dealer bids for the same security. A dealer who purchases a bond from a customer at a price significantly below the prevailing bid prices offered by other dealers in the market for that bond charges an excessive markdown and violates FINRA Rule 2121.

FINRA's five percent markup policy provides a general guideline — though not a hard rule — suggesting that markups and markdowns in excess of five percent may be excessive, depending on the specific circumstances including the price of the security, the nature of the transaction, and the costs and services provided. For low-priced securities, even a small absolute markdown may represent an excessive percentage, while for high-value institutional transactions, a somewhat wider spread may be appropriate given the dealer's capital commitment and risk.

Bid Shading and Dealer Inventory Management

An important dimension of the bid that securities professionals should understand is bid shading — the practice of quoting a bid price below the dealer's true estimate of the security's fair value to protect against the risk of adverse selection. Adverse selection in the market maker context is the risk that the party taking the market maker's bid is better informed about the security's true value than the market maker is — the seller knows something the market maker does not, and is selling to the market maker at a price that will prove too high.

A market maker who offers a bid price equal to their fair value estimate of the security bears the full risk that sophisticated, better-informed sellers will systematically sell to them at that price when the security is overvalued — making money on the spread only from uninformed sellers while losing to informed sellers. By shading the bid — quoting a price somewhat below fair value — the market maker builds in a cushion that compensates, on average, for the losses to informed counterparties by earning more on transactions with uninformed ones.

The magnitude of bid shading is determined by the market maker's assessment of the probability that a given order flow is informed versus uninformed, the volatility of the security, and the intensity of competition from other market makers. In securities with high transparency and extensive analyst coverage — large-cap stocks followed by dozens of analysts — information asymmetry is low, spreads are narrow, and bid shading is minimal. In securities with limited public information and concentrated insider knowledge — small-cap stocks or thinly traded bonds — information asymmetry is high, spreads are wider, and bid shading is more pronounced.

Examination Relevance and Key Takeaways

The bid is tested on the SIE, Series 7, and Series 65 examinations in the context of secondary market mechanics, market maker quotations, the NBBO, bond market quotations, Treasury auctions, and the basic customer transaction principle that a customer selling a security receives the bid price. Candidates must understand the bid as the highest price any current buyer will pay for an immediate transaction, the NBBO as the highest bid across all trading venues, customers sell at the bid and buy at the ask, the firm quote obligation under FINRA Rule 5220, and the competitive and non-competitive bid mechanisms in Treasury auctions.

The core points to retain are these: the bid is the highest price a buyer is currently willing to pay for a security — in the SEC's definition, the highest price a market maker will pay to purchase a specified number of shares at any given time — and a customer who sells a security immediately does so at the prevailing bid price; in a dealer quote, the bid is paired with the ask to form a two-sided quotation in which the bid price is always lower than the ask, with the difference between them being the spread representing the market maker's gross compensation for providing liquidity; the National Best Bid is the highest bid across all trading venues for a given security, and together with the national best offer it forms the NBBO that Regulation NMS requires broker-dealers to meet or beat when executing customer orders; FINRA Rule 5220 requires that published bid quotations be firm — a dealer must honour its posted bid when a seller approaches, subject to limited exceptions; in Treasury auctions, competitive bidders submit yield bids specifying the yield they require, and the Treasury accepts bids from lowest yield upward until the offering is filled, with all successful bidders receiving the same stop-out yield in the uniform-price format used since November 1998, while non-competitive bidders receive the stop-out yield guaranteed in full; in the over-the-counter bond market, the bid-wanted process solicits competing bids from multiple dealers to achieve best execution for a customer selling a bond; and FINRA Rule 2121 requires that any markdown charged when a dealer acts as principal in a customer sell transaction be fair and reasonable relative to the prevailing bid in the market for that security.