According to the Securities Industry and Financial Markets Association (SIFMA), the outstanding value for U.S. debt securities grew almost threefold from $12 trillion in 1996 to more than $34.2 trillion in the first quarter of 2009. Additionally, average daily trading volume in 2008 was $1,036.0 billion for U.S. bonds, compared to $169.1 billion for U.S. equities. The number of bonds outstanding is:
- Treasury: $6.63 trillion
- Federal Agencies: $3.14 trillion
- Corporate: $6.72 trillion
- Mortgage-Related: $8.86 trillion
- Asset-Backed: $2.60 trillion
- Municipal: $2.67 trillion
Investors can buy bonds as new issues on the primary market from underwriters, or trade them with other investors through a brokerage firm on the secondary market. Unlike stocks, the vast majority of bonds trade in the over-the-counter market (OTC), which is made up of a network of brokers and dealers. While no large organized exchange exists for to facilitate the trading of bonds, small amounts of bonds do trade on the New York Stock Exchange, the American Stock Exchange, and the NASDAQ.
By far, the biggest investors in bonds are institutions that include banks, insurance companies, pension funds, corporations and central banks. Individual investors account for a relatively small portion of the bond market.
The U.S. Treasury Market
The U.S. Treasury issues debt obligations that are backed by the full faith and credit of the U.S. government, making it the safest investment there is. According to SIFMA, trading volume of treasury securities averaged over $425.1 billion a day in the fourth quarter of 2008. The U.S. treasury market is the most efficient and liquid securities market in the world.
The Treasury issues bills that mature in one year or less, notes that mature between two and ten years, and bonds that mature between twenty and 30 years. The treasury also issues Treasury Inflation-Protected Securities (TIPS)
New issue treasuries are sold direct to the public in regularly scheduled auctions. Secondary market treasuries are traded through brokerage firms or dealers.
The Federal Agency Market
Government-sponsored enterprises (GSEs) issue bonds at favorable rates in order to support home ownership, farming, small businesses and public works. Although most agencies are not guaranteed by the U.S. government, investors feel there is an implied government backing that allows them to borrow at favorable rates. Some agencies, however, do have the full-faith-and-credit guarantee of the U.S. government (Ginnie Mae, for example).
Federal Agency issuers include the Freddie Mac, Fannie Mae, Federal Home Loan Bank, the Tennessee Valley Authority, the Federal Farm Credit Bank, and the aforementioned Ginnie Mae. Because of they have a higher yield than treasuries, but still have a high credit rating, agency securities are very popular with institutional investors like pension funds, insurance companies, banks, state and local governments, mutual funds, and investment trusts.
The Corporate Market
Because of its size, the corporate bond market is very liquid, although the amount of liquidity can vary greatly for different issuers and even between different bonds of the same issuer. According to SIFMA, trading volume in corporate debt is estimated to be $15.1 billion per day. Outstanding debt totaled $6.7 trillion in the first quarter of 2009 and accounted for 20% of U.S. fixed income debt.
Corporate bond financing is an important source of capital for corporations, and it has become even more important since the financial crisis has limited banks’ ability to lend.
Corporate bonds’ credit quality run the gamut from AAA rated to high yielding junk bonds, and their risk profile is much more complicated than government and agency bonds. Corporate bond prices are determined by much more than just the general level of interest rates- the macroeconomic outlook as well as the profitability outlook for an issuer’s industry, and the issuer’s competitive position within that industry play important roles in determining a bond’s market price. Credit rating, and expected changes to an issuer’s credit rating are also critical determinants of a bond’s market value.
Most corporate bonds trade on a dealer basis with markups (when the investor is buying a bond) and markdowns (when the investor is selling a bond). A markup or markdown is the spread between the bid and ask price, or price that the bond is bought and sold at. For example, a dealer may sell a bond to an investor at 102½ that they simultaneously buy from another dealer at 101½. In that particular transaction, the dealer earned a one point mark-up. This simultaneous purchase and sale is known as a riskless principal transaction. Dealers also purchase bonds to hold in inventory with the hope of selling it in the future at a profit. This type of principal transaction puts the dealer at risk, since there is a chance that the price of the bond will fall. Corporate bonds also trade on an agency basis where the broker is acting as an intermediary between a buyer and seller without taking ownership of the bond. In agency transactions, the broker collects a commission or fee for facilitating the transaction, instead of a mark-up or mark-down.
Although regulators introduced the Trade Reporting and Compliance Engine (TRACE) in 2002 to increase price transparency in the corporate debt market by reporting the price that bonds trade at, investors still have no idea of the dealer’s markup or markdown when they buy or sell a bond on a principal basis. All types of bonds trade on a principal basis with a markup, but spreads are usually smaller for treasury and agency bonds.
The Mortgage Securities Market
The first mortgage security was issued in 1970 when the Government National Mortgage Association (GNMA or Ginnie Mae) packaged together mortgages to sell to investors. A mortgage security represents ownership interest in a bundle of mortgages (usually referred to as pools). Investors that hold mortgage securities receive a pro-rata share of the mortgage payments made on the mortgages that comprise the security. These payments consist of both principal and interest so, unlike most bonds that pay principal in a lump sum at maturity, mortgage securities pay principal back on a monthly basis. To the extent that some mortgages may get paid back before they are due (usually because the owner is moving or buying a different house) the cash flow and maturity of the security is uncertain.
Other government agencies that issue mortgage securities are the Federal National Mortgage Association (FNMA or Fannie Mae) and the Federal Home Loan Mortgage Corporation (FHMLC or Freddie Mac). Ginnie Mae securities are guaranteed by the federal government, but Fannie Mae and Freddie Mac securities are not.
Not all mortgage securities are issued by agencies- private financial institutions also securitize pools of mortgages to sell to investors. At $8.86 trillion, the mortgage security market is the largest segment of the bond market.
The Asset-Backed Market
After the success of mortgage-backed securities, financial institutions began to securitize other types of loans, including credit card debt, student loans, auto loans, and various forms of business loans. Financial lending institutions are limited in the amount of loans they can underwrite by the amount of capital they possess. By securitizing and selling loans and mortgages, financial institutions can raise more capital and make more loans.
The asset-backed market is one of the fastest growing sectors of the bond market. According to SIFMA, asset-backed debt totaled $404 billion in 1996. That number reached $2.67 trillion by the end of 2008.
The Municipal Securities Market
State and local governments issue bonds to finance the building and maintenance of schools, airports, hospitals, housing projects, utilities, transportation infrastructure and other projects. According to SIFMA, Municipal bonds, or “munis”, trading volume averaged $21.8 billion and 43,383 trades a day in 2008.
Investors are attracted to municipal bonds because their income is free from federal income tax, and bonds issued in an investor’s state of residence are also state income tax free. Some munis are also exempt from local city income taxes, as well. Since municipal bonds yield less than taxable bonds of equivalent credit quality, they only appeal to investors in higher tax brackets.
Municipal bonds issue two types of bonds: General Obligation (GO) and Revenue Bonds. General obligation bonds are backed by the full taxing power of the issuing municipality. Revenue bonds are backed from the revenue of the project that they were issued to finance, such as an airport, toll road, or power plant.
Munis are often graded by credit rating agencies such as Moody’s, Standard and Poor’s, and Fitch and carry various degrees of risk. Some issues carry credit insurance that guarantees both interest and principal payment in order to increase their credit ratings.