Financial Sector: Key Players & Economic Impact

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The financial sector is the part of the economy made up of firms and institutions that provide financial services to businesses and households. It includes banks, investment firms, brokerages, insurers, lenders and the markets where capital is raised and traded. Its core job is moving money from people who have it (savers and investors) to people who need it (borrowers and companies), and pricing and carrying the risks involved along the way.

What the financial sector includes

The term is used in two overlapping ways. In economics, the financial sector means every institution that performs financial intermediation, from a central bank to a neighborhood credit union. In investing, “Financials” is one of the 11 sectors in the Global Industry Classification Standard (GICS), the framework used by the S&P 500 and many funds. The GICS version covers only listed companies and groups them into a fixed hierarchy.

The main industries and institution types within the financial sector are:

• Banking. Retail and commercial banks, internet banks, credit unions and savings and loan associations take deposits and make loans. Central banks sit above them, setting monetary policy and acting as lender of last resort.
• Capital markets. Investment banks underwrite stock and bond issues and advise on mergers. Brokerage firms execute trades. Exchanges, clearinghouses and custodians provide the plumbing that lets trades settle.
• Asset management. Mutual fund companies, ETF sponsors, pension managers and hedge funds invest pooled money on behalf of clients.
• Insurance. Life, property and casualty, and reinsurance companies collect premiums and pay claims, investing the premiums in the meantime.
• Consumer and mortgage finance. Credit card issuers, personal loan companies and mortgage lenders extend credit to households.
• Payments and financial technology. Card networks, processors and digital wallets move money between parties. In 2023, GICS moved payment processors such as Visa and Mastercard from Information Technology into Financials.

Real estate brokers and real estate investment trusts (REITs) are often described as part of the financial sector in everyday usage. Under GICS, equity REITs and real estate services were moved into a separate Real Estate sector in 2016, while mortgage REITs remain in Financials.

In the U.S., the largest listed players are the big diversified banks, including JPMorgan Chase, Bank of America, Wells Fargo and Citigroup. Large insurers such as American International Group (AIG) and Chubb are also major members.

How the financial sector works

Most financial firms earn money in one of three ways:

1. Spread income. A bank pays depositors one rate and lends at a higher rate. The difference, earned on a large balance sheet, is its main source of profit.
2. Fee income. Brokers, asset managers, investment banks and payment networks charge commissions, management fees, advisory fees or per-transaction fees.
3. Underwriting income. Insurers collect premiums, pay claims and expenses, and keep what is left, plus returns on the investments they hold before claims are paid.

Hypothetical example: a bank’s net interest margin

The standard measure of spread income is net interest margin (NIM):

NIM = (interest earned on assets − interest paid on deposits and borrowings) ÷ average earning assets

Assume a hypothetical bank holds $10 billion in loans and securities earning an average of 6%, and pays an average of 3% on $9 billion of deposits and borrowings.

• Interest earned: $10 billion × 6% = $600 million
• Interest paid: $9 billion × 3% = $270 million
• Net interest income: $330 million
• NIM: $330 million ÷ $10 billion = 3.3%

If short-term rates rise and the bank must pay 4% on its funding while its long-term loans keep earning 6%, interest paid rises to $360 million and NIM falls to 2.4%. The rates and balances are illustrative only. Because banks tend to borrow short and lend long, the gap between short-term and long-term rates matters a great deal.

Why the financial sector matters to the economy

A functioning financial sector does several things the rest of the economy relies on:

• Credit. Business loans fund expansion and payroll. Mortgages make home buying possible for people without the full purchase price.
• Savings and retirement. Bank accounts, brokerage accounts, funds and pensions let households build and grow savings.
• Risk transfer. Insurance protects people, companies and property from losses they could not absorb alone.
• Payments. Every card swipe, wire transfer and payroll deposit runs through financial infrastructure.
• Capital raising. Companies issue stock and bonds through investment banks and exchanges.

When banks pull back on lending, small businesses and real estate feel it quickly.

What moves financial sector performance

Interest rates and the yield curve

Rates cut both ways. Moderately rising rates can lift what banks earn on loans and cash balances, but rates that rise too fast can reduce demand for mortgages and other credit and cause losses on bonds the firm already holds. Falling rates encourage borrowing, which supports loan volumes, but can squeeze margins.

The yield curve compares short-term and long-term rates. A steep curve generally favors lenders that fund short and lend long. A flat or inverted curve narrows that spread.

Credit quality

When consumers and businesses carry less debt relative to income, defaults fall and lenders set aside less money for loan losses. Rising unemployment or heavy household debt has the opposite effect, forcing larger loss provisions that cut into earnings.

Regulation

Financial firms are among the most heavily regulated companies. Capital requirements, stress tests, consumer protection rules and limits on certain activities add costs and can cap returns, while aiming to protect depositors and the wider system.

The 2007 to 2008 crisis

The global financial crisis began in U.S. mortgage lending and spread through banks and capital markets. Lehman Brothers filed for bankruptcy in September 2008, and the government stepped in to support other major institutions. In the U.S., the Dodd-Frank Act of 2010 followed, with higher capital standards, annual stress tests for large banks and the creation of the Consumer Financial Protection Bureau.

Investing in the financial sector

Investors can gain exposure through individual stocks or sector funds. The Financial Select Sector SPDR Fund (XLF), which tracks the Financials stocks in the S&P 500, is the largest ETF dedicated to the sector.

Many financial companies pay dividends, and valuation often leans on book value as well as earnings. Common metrics include the P/E ratio, price to book value, return on equity, NIM for banks and the combined ratio for insurers. Because a bank’s assets are mostly loans and securities, book value is more meaningful for it than for a software company, though it still depends on how those assets are valued.

Limitations and common confusions

Financial sector vs. Wall Street. Wall Street refers to investment banks, trading firms and exchanges. The financial sector is much broader and also covers community banks, credit unions, insurers and consumer lenders that serve Main Street directly.

Financial sector vs. financial system. The financial system also includes central banks, regulators, laws and market infrastructure. The sector is the set of firms operating within that system.

Classification boundaries shift. Because GICS has moved companies into and out of Financials, a sector return figure from one decade may not cover the same companies as one from another, and long-run comparisons need to account for this.

Sector strength vs. economic health. A strong financial sector often accompanies a healthy economy, and weakness can signal a downturn, but the link is not automatic. Bank profits can rise from fees or trading while lending to the real economy stays flat, and rapid credit growth can build risks that only appear later.

Not one business model. A payment network, a life insurer and a regional bank react differently to the same rate move. Treating “financials” as a single trade can hide those differences.

FAQs

The Bottom Line

Investors weighing financial stocks or sector funds such as XLF need to look past the single label. A payment network, a life insurer and a regional bank respond differently to the same rate move, and metrics like price to book, NIM and the combined ratio fit specific business types. Long-run sector comparisons also need to account for GICS reclassifications that changed which companies count as Financials.