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Credit Default Swaps Explained: The Insurance Market That Often Warns Before Stocks Do
A credit default swap (CDS) is a contract that works like insurance against default. The buyer pays a regular fee, called the spread, to the seller. If the borrower named in the contract, a company or a country, fails to pay its debts or goes through another defined credit event, the seller pays the buyer for the loss. The spread is quoted in basis points per year of the amount insured: a 100 basis point spread costs $100,000 a year to protect $10 million of debt. Rising CDS spreads mean the market sees more risk of default, and because CDS trade among big institutions who watch credit closely, they often move before stock prices. CDS were at the centre of the 2008 financial crisis, when insurer AIG had sold so much protection that it needed a government rescue. In October 2026, rising CDS on AI cloud company CoreWeave and on France were early warning signs. Individual investors don't usually trade CDS, but you can read them as a risk gauge.
What is a credit default swap?
A credit default swap (CDS) is a financial contract that works like insurance on debt.
- The protection buyer pays a regular fee.
- The protection seller collects the fee.
- If the named borrower (the reference entity), a company or a government, defaults, the seller pays the buyer to cover the loss.
The big difference from normal insurance: you don't have to own the bond to buy protection. That means CDS can be used both to hedge and to bet on a borrower getting into trouble.
How a CDS works, step by step
Say a pension fund owns $10 million of bonds issued by Company X and wants protection.
- It buys a 5-year CDS on Company X from a bank.
- The spread is 200 basis points (2%) a year, so the fund pays $200,000 a year.
- If Company X never defaults: the fund pays the fees for five years and gets nothing back. Like car insurance, that's fine.
- If Company X defaults: the bank pays the fund the difference between the bond's face value and what it's now worth. If the bonds recover 40 cents on the dollar, the bank pays about $6 million.
Reading the CDS spread
The spread is the price of protection, quoted in basis points per year. One basis point is 0.01%.
| CDS spread | Annual cost to insure $10 million | What it signals |
|---|---|---|
| 25 bp | $25,000 | Very safe borrower |
| 100 bp | $100,000 | Solid, some risk |
| 300 bp | $300,000 | Meaningful risk, often junk-rated |
| 700 bp+ | $700,000+ | Market sees serious distress |
| 1,000 bp+ | $1 million+ | Default considered quite possible |
The direction matters as much as the level. A spread jumping from 300 to 600 in a few weeks tells you credit investors are getting nervous fast.
Why CDS often move before stocks
Credit investors care about one thing: getting paid back. They watch cash burn, debt levels and refinancing needs closely, and they react quickly.
Stock investors often focus on growth stories. So it's common for a company's CDS to start widening while the stock still looks fine. When the two disagree, the credit market has often been right.
October 2026: two real examples
CoreWeave. The AI cloud company has about $35 billion of debt. In mid-October its CDS rose sharply and yields on its unsecured bonds approached 15%, according to CNBC. The stock fell more than 20% in a week. The credit market's warning helped trigger a wider AI selloff (full story).
France. As cost-of-living protests turned violent and a budget vote loomed, headlines reported French sovereign CDS moving toward levels last seen around 2013. French bank stocks fell up to 3.4% in a day (full story).
The 2008 crisis: when CDS nearly broke the system
CDS became infamous in 2008.
- AIG, the giant insurer, had sold enormous amounts of CDS protection on securities backed by subprime mortgages. It collected fees for years and set aside little capital.
- When housing collapsed, those securities plunged. AIG faced collateral calls it couldn't meet.
- Because AIG owed so many banks, regulators feared its collapse would spread. The US government rescued it with commitments that eventually totaled about $182 billion. Taxpayers were ultimately repaid with a profit.
- Lehman Brothers' bankruptcy in September 2008 was one of the largest CDS credit events ever. It showed how hard it was to know who owed what to whom.
After the crisis, regulators pushed most standard CDS into central clearing and required more reporting and collateral, making the market more transparent.
Single-name, index and sovereign CDS
| Type | Insures against default of... | Example use |
|---|---|---|
| Single-name CDS | One company | Hedging a large bond holding |
| CDS index (CDX, iTraxx) | A basket of 100+ companies | Gauging overall corporate credit stress |
| Sovereign CDS | A government | Measuring country risk |
The CDX and iTraxx indexes are among the best real-time gauges of credit stress in North America and Europe.
Can you use CDS as an individual investor?
You can't easily trade them. CDS trade between large institutions under ISDA contracts. But you can use them as a signal:
- If you own a company's stock and news says its CDS are widening sharply, check its debt load and cash position.
- Rising sovereign CDS for a country can warn of trouble for its banks and currency.
- A broad widening in CDS indexes often comes before or alongside stock market corrections.
For the basics of the asset CDS insure, see How Bonds Work.
The bottom line
A credit default swap is insurance against a borrower not paying. Its price, the spread, is one of the market's best real-time measures of credit risk. You probably won't trade CDS, but learning to read them can give you an early warning that stock prices haven't caught up with yet.
This article is educational and not personalized investment advice.
Frequently asked questions
What is a credit default swap in simple terms?
A credit default swap is a contract in which one party pays regular fees to another in exchange for protection if a particular company or government fails to pay its debts. It works much like an insurance policy on a bond, except that you don't have to own the bond to buy the protection.
What does a CDS spread mean?
The spread is the annual cost of protection, quoted in basis points (hundredths of a percent) of the amount insured. A spread of 100 basis points means paying 1% a year, or $100,000 annually to protect $10 million of debt. Higher spreads mean the market thinks default is more likely.
What is a credit event?
A credit event is what triggers a payout. Standard contracts include bankruptcy, failure to pay and, for some contracts, certain debt restructurings. In the market, an industry committee organised through ISDA decides whether a credit event has occurred.
How did credit default swaps cause the 2008 crisis?
They didn't cause it alone, but they spread and concentrated the risk. Insurer AIG sold huge amounts of CDS protection on mortgage-linked securities without setting aside enough capital. When those securities collapsed, AIG faced margin calls it couldn't meet and received a government rescue that totaled about $182 billion in commitments.
Can regular investors buy credit default swaps?
Generally no. CDS trade over the counter between banks, hedge funds, insurers and other large institutions under ISDA agreements. Individual investors can, however, follow CDS spreads reported in financial news as a signal of credit risk.
Why do CDS move before stocks?
Credit investors focus on one question: will I get paid back? They tend to react quickly to rising debt, falling cash or tighter financing. Stock investors may be focused on growth stories. When CDS spreads widen while a stock is still high, it can be an early warning that the debt picture is deteriorating.
What does a widening sovereign CDS mean?
A sovereign CDS insures against a country defaulting on its government bonds. Wider spreads mean investors see more fiscal or political risk. In October 2026, French CDS reportedly moved toward levels last seen around 2013 as protests and budget worries mounted.
Primary sources
- US Securities and Exchange Commission — Credit default swaps (Investor.gov glossary)
- Federal Reserve History — The Great Recession and its aftermath
- US Treasury — AIG investment program
- ISDA — Credit derivatives definitions and determinations committees
- CNBC Investing Club — Why did CoreWeave stock get crushed this week? Look to this corner of the debt market (Oct. 16, 2026)
- Reuters via Investing.com — French stocks slide after violent protests (Oct. 19, 2026)
Data & disclaimer: This article is for educational purposes only and is not financial or investment advice. Figures reflect data available as of Oct 20, 2026, and conditions change — always confirm current pricing, rates and rules with the provider before you act. Written by Elizabeta Dimoska. See our editorial standards and disclosure.
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