Bonds are traded on an exchange or over the counter depending on the bond, but the overwhelming majority trade over the counter. Corporate bond volume runs more than 99 percent OTC, and municipals and Treasuries trade almost entirely through dealer networks. Exchange-listed bonds exist — the NYSE Bonds platform is the best-known U.S. venue — but they represent a small slice of the market. With more than $140 trillion in bonds outstanding globally, where a bond trades shapes the price you see, the spread you pay, and how much you can verify after the fact.
How the Over-the-Counter Bond Market Works
The OTC bond market is a decentralized network. Broker-dealers hold their own inventory and negotiate prices directly with each other and with customers, rather than matching orders on a central book. Two investors buying the same bond at the same moment can pay slightly different prices depending on which dealer they go through and how much they are buying.
You are not trading blind, though. The Financial Industry Regulatory Authority oversees broker-dealer conduct in this market.1FINRA. Five Steps to Protecting Market Integrity Under FINRA Rule 6730, any firm that is a party to a trade in an eligible fixed-income security must report the transaction to the Trade Reporting and Compliance Engine within 15 minutes of execution.2FINRA. 6730 Transaction Reporting TRACE then publishes the price and volume publicly, so you can check whether the price you got was in line with recent trading. Before TRACE launched in 2002, retail bond investors had almost no access to real-time price data. The system now covers corporate debt, agency securities, asset-backed and mortgage-backed securities, and, since 2017, U.S. Treasury securities.3FINRA. TRACE at 20 – Reflecting on Advances in Transparency in Fixed Income
The market is built around institutional trade sizes. Institutions commonly transact in round lots of $1 million or more in par value, and block trades of $15 million or higher are routine.4FINRA. Receiving Investors in the Block Market for Corporate Bonds Retail investors can buy smaller amounts, sometimes as little as one bond with a $1,000 face value, but they generally pay wider bid-ask spreads for the privilege.
How Exchange-Traded Bonds Are Different
A small fraction of bonds trade on centralized exchanges like the NYSE Bonds platform. These venues work more like the stock market: buy and sell orders sit on a visible order book and match automatically by price and time priority.5NYSE. NYSE Bonds You can see the best available bid and offer prices in real time, which removes much of the guesswork of OTC negotiation. Regulated exchanges operate under SEC oversight and must maintain rules that promote fair and orderly markets.6U.S. Securities and Exchange Commission. Statutes and Regulations
So why isn’t more bond trading done this way? Two reasons. The OTC market is flexible in ways an exchange is not: dealers can absorb enormous block trades, accommodate unusual maturities, and negotiate customized terms. And the sheer number of separate bond issues gets in the way. A single corporation might have dozens of outstanding bonds with different coupons, maturities, and covenants. Listing each one on an exchange is impractical, and most issuers do not bother.
Where Different Kinds of Bonds Actually Trade
U.S. Treasury Securities
Treasury bonds, notes, and bills trade over the counter, not on a stock exchange. In the interdealer market, most trading in benchmark Treasuries happens on electronic platforms with a central limit order book, such as BrokerTec and eSpeed. Dealer-to-customer trades typically go through by phone or through electronic request-for-quote systems.7U.S. Department of the Treasury. Joint Staff Report: The U.S. Treasury Market on October 15, 2014 Treasury futures are a separate product and trade on regulated futures exchanges like the Chicago Board of Trade.
Corporate Bonds
Most corporate bonds trade OTC through dealer networks. Some are also listed on exchanges like NYSE Bonds. To get an exchange listing, a bond generally has to be registered with the SEC under the Securities Act of 1933, which requires the issuer to file a prospectus with detailed financial disclosures.8eCFR. 17 CFR Part 230 – General Rules and Regulations, Securities Act of 1933 Many corporate offerings above $10 million in aggregate principal must also comply with the Trust Indenture Act of 1939, which requires the issuer to appoint an independent trustee to protect bondholders.9Office of the Law Revision Counsel. 15 USC Chapter 2A Subchapter III – Trust Indentures
Municipal Bonds
Municipal bonds, issued by state and local governments, trade almost exclusively OTC. Interest on most municipal bonds is excluded from federal income tax under 26 U.S.C. § 103, which is a large part of their appeal to investors in higher tax brackets.10Office of the Law Revision Counsel. 26 U.S. Code 103 – Interest on State and Local Bonds That exclusion does not apply to certain private activity bonds or to arbitrage bonds. If you buy a municipal bond issued by a state other than the one you live in, the interest may still be subject to your home state’s income tax.
Convertible Bonds and Baby Bonds
Two categories tilt the other way. Convertible bonds, which let the holder convert the debt into a set number of the issuer’s shares, are commonly listed on exchanges alongside the issuer’s stock. Baby bonds — corporate debt issued in $25 par value denominations instead of the standard $1,000 — are also frequently exchange-listed because the small denomination is aimed at retail buyers.11FINRA. Baby Bonds: What to Know Before Investing
What Trading OTC Costs You
In the OTC market, the main transaction cost is the bid-ask spread, which is the gap between what a dealer will pay for a bond and what the dealer will charge to sell it. Dealers may also add a markup when selling to you or a markdown when buying from you, on top of the prevailing market price. These costs are not always broken out separately on your trade confirmation, though FINRA rules require broker-dealers to disclose markups and markdowns on certain transactions.
Trade size matters enormously. For municipal bonds, effective spreads on retail-sized trades of $100,000 or less averaged about 56 basis points, or 0.56 percent of price, while trades of $1 million or more averaged closer to 18 basis points.12MSRB. A Comparison of Transaction Costs The retail investor buying a single bond is paying a materially higher implicit cost than an institution buying a million-dollar lot of the same paper. Exchange-listed bonds get around some of this because the order book shows competing bids and offers in real time, but that benefit only reaches you on the small subset of issues that are actually listed.
Bond ETFs: The Exchange Route to Fixed Income
If you want the price transparency of an exchange without hunting for the handful of listed bonds, bond exchange-traded funds are the alternative most retail investors use. A bond ETF holds a portfolio of bonds and trades on a stock exchange throughout the day like a share of stock. Bond ETFs have been available since 2002 and have grown steadily as a way to get diversified fixed-income exposure with lower minimums and real-time pricing.
They are not identical to owning bonds directly. A bond ETF has no fixed maturity date; the fund continuously rolls its holdings to maintain a target portfolio, so there is no guaranteed return of principal on a specific date. The ETF’s market price can also deviate slightly from the value of the bonds it holds. What you get in exchange is a single trade that builds a diversified position and avoids the wide spreads that small OTC bond purchases carry.
Settlement: What Happens After the Trade
Bond trades settle differently from the way stocks used to, and the timelines matter if you are moving cash in and out of positions. Most corporate bonds settle on a T+1 basis, one business day after the trade date, under the SEC’s amended Rule 15c6-1.13U.S. Securities and Exchange Commission. Shortening the Securities Transaction Settlement Cycle Municipal bonds are technically exempt from that SEC rule, but the Municipal Securities Rulemaking Board adopted T+1 settlement through its own Rules G-12 and G-15 to stay aligned.14MSRB. MSRB 2023-07 SEC Approval Order The shorter cycle reduces the window in which either party is exposed to a failed delivery. The Depository Trust & Clearing Corporation and its subsidiaries handle the final transfer of securities and cash for effectively all broker-to-broker bond settlements in the United States.15DTCC. Clearing and Settlement Services
The practical takeaway: for most bonds you might want to buy, the trade will run through a dealer rather than an exchange order book. That does not leave you without protection or information. TRACE lets you check recent transaction prices before and after you trade, spreads shrink sharply as size grows, and bond ETFs give you an exchange-listed way to hold fixed income when you would rather not negotiate individual bonds at all.