Mortgages on the secondary market are bought by a familiar cast: Fannie Mae and Freddie Mac, issuers using Ginnie Mae’s guarantee, the Federal Reserve, commercial banks, pension funds, life insurance companies, mortgage REITs, investment banks packaging private-label deals, and foreign central banks and sovereign wealth funds. Some buy whole loans. Most buy mortgage-backed securities built from pools of loans. Either way, the point is the same: lenders sell the mortgages they originate so they can lend the money out again, and a wide pool of investors ends up holding the debt. Your loan terms don’t change when that happens, but the company you pay might.
Fannie Mae and Freddie Mac
The Federal National Mortgage Association (Fannie Mae) and the Federal Home Loan Mortgage Corporation (Freddie Mac) are the largest and most visible buyers. Congress created both to provide stability and liquidity in the secondary mortgage market so lenders always have somewhere to sell loans and reload their capital.1Office of the Law Revision Counsel. 12 USC Chapter 13, Subchapter III – National Mortgage Associations Freddie Mac’s charter spells out the same purpose: promote access to mortgage credit nationwide and improve the distribution of investment capital for housing.2Office of the Law Revision Counsel. 12 USC 1451 – Definitions
Both buy “conforming” loans, meaning mortgages that meet standardized size limits, credit benchmarks, and documentation requirements. For 2026, the baseline conforming loan limit for a single-unit property is $832,750 in most of the country. In designated high-cost areas the ceiling rises to $1,249,125, which is 150 percent of the baseline.3Federal Housing Finance Agency. FHFA Announces Conforming Loan Limit Values for 2026
Once Fannie Mae or Freddie Mac buys a pool of loans, they package them into mortgage-backed securities and sell those securities to investors worldwide. Neither entity lends to homebuyers directly or originates loans. They sit behind the scenes, buying debt from lenders and channeling investor capital back into housing.1Office of the Law Revision Counsel. 12 USC Chapter 13, Subchapter III – National Mortgage Associations The Federal Housing Finance Agency has operated as conservator of both since 2008, with authority over which loans they can buy and how much risk they can take on.4Federal Housing Finance Agency. Conservatorship
Ginnie Mae
Ginnie Mae plays a different role. It doesn’t buy loans or issue securities. It guarantees mortgage-backed securities that approved lenders create from government-insured loans, primarily FHA, VA, and USDA mortgages.5Ginnie Mae. Programs and Products When an approved lender pools together FHA or VA loans and sells securities to investors, Ginnie Mae’s guarantee ensures investors receive principal and interest on time even if borrowers default.
That guarantee carries the full faith and credit of the United States government, which puts Ginnie Mae securities among the safest investments available.6Ginnie Mae. Funding Government Lending Fannie Mae and Freddie Mac securities do not carry that explicit federal guarantee, though investors have long treated them as nearly equivalent given the government conservatorship. At the end of fiscal year 2025, investors held over $2.6 trillion in outstanding Ginnie Mae mortgage-backed securities, with roughly 62 percent backed by FHA loans and 31 percent by VA loans.5Ginnie Mae. Programs and Products
The Federal Reserve
The Federal Reserve is not a typical investor looking for returns. It buys agency mortgage-backed securities as a tool to manage the money supply and influence interest rates. Section 14 of the Federal Reserve Act authorizes the central bank to purchase and sell securities in the open market, and large-scale MBS purchases became a core policy instrument after the 2008 financial crisis.7Board of Governors of the Federal Reserve System. Agency Mortgage-Backed Securities (MBS) Purchase Program
As of early March 2026, the Fed held approximately $2.01 trillion in agency mortgage-backed securities on its balance sheet, all guaranteed by Fannie Mae, Freddie Mac, or Ginnie Mae.8Board of Governors of the Federal Reserve System. Factors Affecting Reserve Balances – H.4.1 That figure has been declining as the Fed allows maturing securities to roll off without reinvesting, a process that gradually tightens financial conditions. When the Fed buys heavily, long-term rates generally fall and mortgage rates with them. When it steps back, the opposite tends to happen.
Commercial Banks and Credit Unions
Not every mortgage gets sold. Commercial banks and credit unions sometimes keep loans on their own books as portfolio investments. Research on conforming mortgage originations found that roughly 40 percent of loans stayed on lender balance sheets rather than being securitized through Fannie Mae or Freddie Mac. Banks that hold loans earn interest income directly over the life of the mortgage, and they can keep loans that sit slightly outside GSE guidelines but still meet their own credit standards.
Banks also show up on the buy side. A regional or community bank might purchase agency mortgage-backed securities as low-risk assets for its investment portfolio, a way to put excess deposits to work in interest-bearing assets without originating more loans.
Pension Funds and Insurance Companies
Pension funds and life insurance companies are steady, long-term buyers of mortgage-backed securities. They almost never buy individual whole loans, because managing thousands of separate borrower accounts isn’t practical at their scale. Instead they buy securities representing pools of residential debt, which gives them diversified exposure to mortgage interest payments without the administrative load.
The appeal is yield and duration. Agency MBS pay more than Treasury bonds with modest credit risk, and the cash flows from a pool of 30-year mortgages line up well with the multi-decade liabilities a pension plan or an insurer writing life policies and annuities has to fund.
Mortgage REITs
Mortgage real estate investment trusts pool capital from individual investors and use it to buy mortgages and mortgage-backed securities. Anyone can buy shares of a publicly traded mREIT on a stock exchange, which makes this one of the few ways ordinary investors gain direct exposure to the secondary mortgage market.9Nareit. Guide to Mortgage REIT (mREIT) Investing
Most residential mREITs invest heavily in agency mortgage-backed securities, the same instruments guaranteed by Fannie Mae, Freddie Mac, and Ginnie Mae. A growing segment also buys non-agency debt, including non-qualified mortgages that don’t meet the strict documentation or income-verification standards the GSEs require. Large mREITs such as Annaly Capital Management have become significant issuers in the non-QM securitization market, packaging those loans and selling them on to other investors.
To qualify for favorable tax treatment, a REIT must distribute at least 90 percent of its taxable income to shareholders each year.10Office of the Law Revision Counsel. 26 USC 856 – Definition of Real Estate Investment Trust That requirement explains the high dividend yields mREITs are known for. It also means they need a constant flow of interest income, so they stay active buyers in the secondary market. Many use leverage aggressively, borrowing at short-term rates to fund higher-yielding long-term mortgage assets.
Investment Banks and Private-Label Securitizers
Investment banks buy mortgages from lenders and package them into private-label mortgage-backed securities, meaning securities without any government agency guarantee. This is how jumbo loans, non-QM loans, and loans with unusual features reach investors. The bank acts as middleman: it buys the loans, structures them into tranches with varying levels of risk and return, and sells the resulting securities to institutional buyers.
The private-label market collapsed during the 2008 financial crisis but has gradually rebuilt. By 2025, non-agency residential mortgage-backed securities issuance had grown to roughly $180 billion annually. The credit risk sits with investors rather than any government entity, so the securities generally pay higher yields. Hedge funds, asset managers, and insurance companies are common buyers of private-label tranches.
Foreign Governments and Sovereign Wealth Funds
Foreign governments, central banks, and sovereign wealth funds have been consistent buyers of U.S. mortgage debt for decades.11Ginnie Mae. Foreign Ownership of Agency MBS They view agency mortgage-backed securities as stable, dollar-denominated assets that pay better than U.S. Treasury bonds while carrying minimal credit risk. For nations with large trade surpluses, parking reserves in agency MBS diversifies holdings beyond Treasuries without meaningfully increasing risk.
Foreign central banks hold these securities as part of their foreign exchange reserves. Treasury Department data shows that foreign official institutions, including central banks and sovereign wealth funds, collectively hold well over a trillion dollars in U.S. agency debt.12Department of the Treasury. Foreign Portfolio Holdings of U.S. Securities as of June 28, 2024 Much of the demand comes from Asian central banks, where growth in foreign exchange reserves tracks with increased allocation to agency MBS.11Ginnie Mae. Foreign Ownership of Agency MBS That additional pool of capital helps keep mortgage rates lower than they would be if the market relied on domestic investors alone.
What a Mortgage Sale Means for You
If you’ve received a letter saying your mortgage has been sold or transferred, the most important thing to know is that your loan terms do not change. Your interest rate, monthly payment, remaining balance, and payoff date all stay the same. The only difference is where you send your payment and who you call with questions.
Federal law requires your old servicer to notify you at least 15 days before the transfer takes effect. Your new servicer must send its own notice within 15 days after the transfer, or the two companies can send a single combined notice at least 15 days before the effective date.13Consumer Financial Protection Bureau. 1024.33 Mortgage Servicing Transfers Those notices must include the new servicer’s name, address, phone number, and the transfer date.
You also get a 60-day grace period for misdirected payments. If you accidentally send a payment to your old servicer during the first 60 days after the transfer, it cannot be treated as late for any purpose, and no late fee can be charged.13Consumer Financial Protection Bureau. 1024.33 Mortgage Servicing Transfers Separately, the new owner of your mortgage must notify you of the ownership change within 30 days of acquiring it.14eCFR. 226.39 Mortgage Transfer Disclosures Keep every notice you receive and update your autopay settings once the transfer is final. Mortgage sales happen constantly, and most borrowers never notice anything beyond a new return address on the statement.