What Is the Bond Market? How It Works, Its Size and What 2022 Did to Each Part

Michael Whitman · Trading since 2017, full-time since 2020 · YouTube creator, 137K subscribers · Published 2026-09-14 · Updated 2026-11-02 · Reviewed 2026-11-01

The bond market is where governments and companies borrow by selling debt, and where investors trade that debt afterward, mostly through dealers rather than on an exchange. In the US it held $61.2 trillion of bonds at the end of 2025, a little less than the stock market’s value.

Most explanations stop at the definition. This one measures three things a buyer runs into: how thinly most bonds trade, how much a rate rise cost each part of the market in 2022, and why bonds no longer reliably cushion a stock fall.

How it works

A bond is a loan cut into tradable pieces. The borrower promises interest at set dates and the face value back at maturity. Whoever holds the bond on those dates gets paid.

The primary market is where a bond is born. The US Treasury sells new bills, notes and bonds at public auctions; companies and cities usually sell through banks that place the issue with investors. The price that clears the sale sets the yield the borrower pays.

The secondary market is everything after. The bond trades between holders until it matures or is repaid early. Shares meet on an exchange with a visible order book. A bond buyer asks one or more dealers for a price; a dealer quotes, and the trade is done between two parties.

So there is no single posted price. There is the price a dealer will pay and the price a dealer will sell at, and they can differ between dealers for the same bond at the same moment. The dealer’s margin sits inside the quote, which is why the spread is the cost to watch. FINRA’s TRACE system collects mandatory reports of over-the-counter trades in eligible bonds from member firms, so public bond trade data arrives after the fact rather than from a live order book.

Price and yield move in opposite directions. A bond’s coupon is fixed when it is issued. When new bonds pay more, an old one is only worth buying at a lower price, so rising rates mean falling prices.

Quoted yields differ: on 23 Oct 2026, current yield and yield to maturity on Treasuries were a median 0.79 point apart.

How big it is

At the end of 2025, US bonds outstanding totaled $61.2 trillion, 38.1% of the world’s $160.7 trillion, according to SIFMA’s 2026 Fact Book. The US stock market’s value, counted as the market capitalization of listed domestic companies, was $68.9 trillion, 43.7% of the world’s $157.8 trillion.

So the US bond market was about 11% smaller than the US stock market, while worldwide, debt securities outstanding were about 2% larger than stock market value.

Treasuries are the largest single piece. SIFMA puts them at $30.27 trillion for 2025. The Treasury’s own Monthly Statement of the Public Debt showed $31.828 trillion of marketable Treasury securities on 31 Aug 2026.

Where trading is deep and where it is thin

Treasuries change hands constantly. At 3.49% a day, the whole stock turned over about once every 29 trading days. At the corporate and municipal rates, the outstanding amount would take about 197 and 284 trading days to change hands once.

That gap is what liquidity means in practice. In a market where a given bond may not trade for days, the price you see is the last trade or a dealer’s estimate, and a dealer who is already holding inventory can widen the quote or decline to bid.

Auction and screen line up closely: in 193 of 203 10-year note sales since 2010, the clearing yield landed no more than 0.05 percentage points from the market yield FRED lists for the same date.

What 2022 did to each part

2022 was the test every part of the market took at once. From 31 December 2021 to 30 December 2022 the 2-year Treasury yield rose from 0.73% to 4.41%, the 10-year from 1.52% to 3.88% and the 30-year from 1.90% to 3.97% (FRED). We took nine iShares funds that each hold one part of the market and measured their total return, distributions included, from Yahoo’s adjusted closes.

Every one of the nine lost money in 2022, and the loss grew with maturity. The 1-3 year fund SHY lost 3.88%, the 3-7 year IEI 9.51%, the 7-10 year IEF 15.16%, the 10-20 year TLH 25.24% and the 20+ year TLT 31.23%. Short yields rose the most, 3.68 points against 2.07 for the 30-year, yet the short fund lost the least, because a bond that repays soon has few years left at the old, lower coupon. Its duration is the number that captures that.

Across segments, the whole investment-grade market (AGG) lost 13.02%, investment-grade corporate bonds (LQD) 17.92%, high-yield corporate bonds (HYG) 10.98% and municipal bonds (MUB) 7.35%. SPY lost 18.18% the same year.

Almost five years on, the long end is still under water. From the end of 2021 to 30 October 2026, SHY returned +10.61% and HYG +16.86%, while TLT was -34.18% and AGG, the broad market, -0.76%. Over the same span SPY returned +69.52%. Every figure is in the bond fund file.

Do bonds still move against stocks?

For most of the last two decades, yes; since 2022, mostly not. We compared the daily total returns of SPY, the S&P 500 fund, with IEF on every day both traded from 31 July 2002 to 26 October 2026, using Yahoo’s adjusted closes so distributions count.

From 2003 through 2021 the correlation of their daily returns was -0.39. It was below zero in 18 of those 19 calendar years; the exception was 2006, at +0.09. In 2011 it reached -0.68, and SPY and IEF moved in opposite directions on 185 of 252 days.

From 2022 through 26 October 2026 it was +0.11. It was positive in 2022, 2023 and 2024, dipped to -0.09 in 2025, and in 2026 so far it is +0.36, the highest of any year since 2003. 2022 was the only calendar year in the sample in which both funds lost money: SPY returned -18.18% and IEF -15.16%.

Nothing in that pattern is a rule. The sign has changed before and can change again. The first positive year after 2006 was 2022, the year the 10-year yield rose from 1.52% to 3.88%.

A worked example

A $100 10-year Treasury note bought at par on 31 Dec 2021 carried the 10-year yield of that day, 1.52%, as its coupon: $0.76 every six months. On 30 Dec 2022 the 10-year yield was 3.88%. Priced at that yield with nine years left, the same note was worth about $82.22, a fall of 17.78%.

Held to maturity, that loss resolves. The owner still collects 18 more coupons of $0.76, $13.68 in all, and $100 at the end. The market price fell; the promised payments did not change.

A bond fund has no maturity to wait for. IEF closed at a high of $123.06 on 4 Aug 2020. On price alone, not counting distributions, its lowest close since then was $88.92 on 5 Oct 2026, and on 30 Oct 2026 it closed at $91.76, 25.43% below that high. Counting its distributions, as Yahoo’s adjusted close does, it was 12.26% below. A fund keeps selling older bonds and buying new ones, so there is no date on which it returns to any price.

Same rate exposure, different experience. The individual note repays its face value on a known date; the fund recovers only if yields fall or its higher new coupons build up over time.

The original data

Size and turnover, read 4 Oct 2026: SIFMA Capital Markets Fact Book 2026 (executive summary, Table 27 and Table 40) and the Treasury’s Monthly Statement of the Public Debt (Table 1), assembled in the bond market figures file. SIFMA compiles the volumes from the Federal Reserve Bank of New York, FINRA TRACE and the Municipal Securities Rulemaking Board; they measure trading, not prices, and cover a single year.

The 2022 fund test, downloaded 1 Nov 2026: Yahoo adjusted closes for the nine funds and SPY, the last close of 2021 and of 2022, and 30 October 2026. Nasdaq’s closes for IEF, TLT and SHY over 2,514 sessions from 31 October 2016 differ from Yahoo’s by more than a cent on 1, 1 and 0 days. Yields are FRED’s daily constant-maturity series.

The stock-bond test, downloaded 27 Oct 2026: 6,099 daily returns for each fund, one Pearson correlation per calendar year, in the SPY and IEF correlation file. FRED’s S&P 500 index and its 10-year Treasury yield give the same sign in all 10 years from 2017 to 2026 without either fund (2022: +0.18 against +0.19), in the FRED check file.

Rates on 29 Oct 2026: the 10-year Treasury yield was 4.98% (FRED, DGS10), the latest value in the file, down from its 2026 high of 5.31% on 5 October. Nothing here forecasts where it goes next.

When it fails

The characteristic failure is treating a bond fund as a bond. The plan that works for one note, hold through the rate rise and collect face value on the date, has no date to wait for in a fund. IEF was still 25.43% below its 2020 high in price six years later.

A second failure is counting on bonds to cushion a stock fall. That held in most years from 2003 to 2021 and did not in 2022, when IEF lost 15.16% in the same year SPY lost 18.18%.

A third is reaching for yield with maturity. A longer bond usually pays more, and in 2022 TLT lost 31.23% against SHY’s 3.88%.

A fourth is assuming you can sell at the screen price. In a dealer market the quote is an offer to talk, and it can move before you do. Corporate bonds traded about 0.51% of their amount on an average day in 2025, so in small lots the dealer’s margin can take a large share of the yield.

Questions people ask

What is the bond market in simple terms?

The market where governments and companies borrow by selling bonds, and where those bonds are traded afterward. US bonds outstanding totaled $61.2 trillion at the end of 2025, and most of them trade through dealers rather than on an exchange.

What does it mean when the bond market goes down?

Bond prices are falling, which is the same thing as yields rising. In 2026 the 10-year Treasury yield rose from 4.18% at the end of 2025 to 5.31% on 5 Oct 2026, its highest since May 2002 (FRED), the day IEF made its lowest close since its 2020 high. From the last close of 2025 to 30 Oct 2026, AGG returned -0.56% and TLT -2.83%. When the bond market goes up, prices rise and yields fall.

Is the bond market bigger than the stock market?

Worldwide, slightly: $160.7 trillion of bonds against $157.8 trillion of stock market value in 2025. In the US it was the other way round, $61.2 trillion against $68.9 trillion.

Can you lose money in the bond market?

Yes, on price. In 2022 all nine bond funds measured here lost money, from 3.88% for short Treasuries to 31.23% for long ones. A single bond held to maturity still repays its face value unless the issuer defaults.

Do bonds go up when stocks go down?

Often, but not reliably. SPY and IEF daily returns had a correlation of -0.39 from 2003 to 2021 and +0.11 from 2022 to October 2026, and both funds lost money in 2022.

Why did my bond fund not recover like a bond would?

A fund never matures. IEF was 25.43% below its August 2020 high on 30 Oct 2026, and 12.26% below counting distributions, while a single note bought in 2021 still repays $100 at maturity.

Related

Corporate bond covers the part of the market that carries credit risk on top of rate risk. Spread covers the dealer margin built into every bond quote. And trading fees covers the full cost stack over a long holding period, including fund expenses.

A bond tender offer is how an issuer buys its own debt back early, and why the bonds left behind can become harder to sell.

This page is educational, not financial advice. Test every idea on your own charts before risking money.