CDS Index: Trade Broad Credit Risk with CDX and iTraxx

Key Takeaways

• CDX IG (125 US investment-grade names) and iTraxx Europe (125 European investment-grade names) are the benchmarks for investment-grade credit hedging, rolling to a new series every six months.
• CDS index series roll every six months; liquidity migrates to the new on-the-run series, leaving old-series positions with wider bid-ask spreads and harder exit conditions.
• The index spread is a market-traded price distinct from the weighted average of individual single-name CDS spreads; the difference (skew) can be positive or negative and reflects index-specific supply and demand.
• A $500 million bond portfolio can be hedged against credit-spread widening in one ticket by buying CDX IG protection, avoiding the operational burden of 125 individual single-name CDS contracts.

What It Is

Two families dominate the market:

• CDX covers North American and emerging-market credits. It is administered by CDS Index Company and marketed by the index administrator (Markit, now part of S&P Global). The most watched members are CDX IG (125 US investment-grade names) and CDX HY (100 high-yield names).
• iTraxx covers Europe, Asia, Middle East and Africa. The flagship iTraxx Europe (sometimes called "The Main") is 125 equally-weighted European investment-grade names. iTraxx Crossover captures sub-investment-grade European credits.

Every six months, a new series is rolled. The index administrator polls a panel of dealers, replaces names that have become illiquid or experienced credit events, and publishes the new constituent list. The prior series continues to trade but becomes less liquid as participants move to the on-the-run series.

The Intuition

Managing single-name CDS is operationally heavy. Each name has different documentation nuances, different credit-event history, and different liquidity. An investor who just wants "more credit risk" or "less credit risk" does not want to assemble 125 contracts one at a time.

CDS indexes bundle the market into one trade. Buying protection on the CDX IG is economically similar to buying protection on each of the 125 underlying names in equal size, all in one ticket. For real-money accounts, hedge funds, and banks hedging loan books, that convenience makes indexes the default instrument and single-name CDS the specialist tool.

How It Works

Each series has a fixed coupon: 100 basis points for investment-grade indexes and 500 basis points for high-yield indexes. The traded price of the index moves away from par to reflect the current market spread. Differences between the fixed coupon and the market spread are settled via an upfront payment at trade date, mirroring the single-name CDS Big Bang convention.

Maturities are standardized (commonly 5Y, 7Y, 10Y) with fixed quarterly coupon dates of 20 March, 20 June, 20 September, 20 December. Credit events on a constituent trigger a version bump of the index: the defaulted name is removed and the remaining 124 (or 99) names carry on. Holders of the pre-event series receive the auction-determined payout on the defaulted constituent's share of the notional.

CDS indexes also have their own options market (credit index options), allowing traders to bet on direction and on implied spread volatility.

Worked Example

An asset manager holds a diversified US investment-grade corporate bond portfolio worth $500 million. Credit spreads have tightened, and the manager wants to hedge against a widening without selling bonds and generating tax consequences.

The manager buys 5-year CDX IG protection on $500 million notional. Current on-the-run CDX IG trades at a market spread of 65 bp, with a fixed coupon of 100 bp.

Upfront payment: because the market spread (65 bp) is below the fixed coupon (100 bp), the protection buyer receives an upfront payment (roughly 1.7 percent of notional, depending on risky duration). The buyer then pays 100 bp per year.

Three months later, credit spreads widen to 110 bp. The index mark-to-market value moves in the buyer's favor. The paper gain on the CDS position offsets the paper loss on the bond portfolio. The manager can unwind the hedge whenever the gap closes, or let it run.

Common Mistakes

1. Confusing index spread with weighted average of single-name spreads. Index spreads are observable market prices set by supply and demand; single-name spreads are separate markets. The difference, known as the skew, can be positive or negative and reflects both technical demand for the index and idiosyncratic moves in individual names.

2. Assuming all names in the index carry restructuring as a credit event. CDX HY typically trades without restructuring. iTraxx Europe and CDX IG typically trade with Mod-Mod-R restructuring. Mixing the two conventions when writing protection can produce unexpected payoffs.

3. Ignoring the roll. When a new series rolls, liquidity moves with it. Positions in the old series become harder to trade and wider in bid-offer. Portfolio managers who do not plan for the roll get stuck holding stale-series risk.

4. Treating the index as a perfect hedge for a bond portfolio. The index references 125 names with fixed weights. A real-world corporate bond portfolio has different names, different weights, different durations. Basis risk between the two can be meaningful in a stress event.

5. Misreading on-the-run versus off-the-run prices. Financial data providers often quote the on-the-run series by default. Comparing prices across series without adjusting for the coupon and composition will misstate the spread move.

Frequently Asked Questions

Q: What is a CDS index in simple terms? A CDS index is a standardized, tradable basket of credit default swaps on a defined set of corporate names. Buying CDX IG protection in one trade hedges against default risk on 125 investment-grade US companies simultaneously, replacing what would otherwise be 125 separate contracts.

Q: How does a CDS index affect investment decisions? CDS indexes give portfolio managers an efficient way to add or remove broad credit risk without trading bonds. A manager who expects credit spreads to widen can buy CDX IG protection to hedge a corporate bond portfolio, or sell protection to add credit exposure in a single liquid transaction.

Q: What is a real-world example of a CDS index trade? An asset manager with $500 million in US investment-grade bonds buys 5-year CDX IG protection at a market spread of 65 basis points. Three months later, credit spreads widen to 110 basis points. The mark-to-market gain on the CDS position offsets the paper loss on the bond portfolio without requiring any bond sales.

Q: How can investors use CDS indexes alongside single-name CDS? CDS indexes are the default instrument for macro credit views and portfolio hedges. Single-name CDS is the specialist tool for expressing views on individual issuers. Investors often combine them, using CDX for broad hedges and single names to express idiosyncratic views where the index provides no precise exposure.

Q: How is a CDS index different from a high-yield bond ETF? A high-yield bond ETF holds actual bonds, pays coupons, has a NAV, and requires no margin. A CDS index is a derivative that requires upfront payment and margin, pays no coupon in the traditional sense, and provides credit protection without owning the underlying bonds. ETFs are for long-only investors; CDS indexes are for two-sided credit hedging and speculation.

Sources

1. S&P Dow Jones Indices. "iTraxx / CDX Total and Excess Return Indices Methodology." https://www.spglobal.com/spdji/en/documents/methodologies/methodology-itraxx-cdx-tr-er-return-indices.pdf
2. IHS Markit. "CDS Indices Primer 2021." https://cdn.ihsmarkit.com/www/pdf/1221/CDS-Indices-Primer---2021.pdf
3. Federal Reserve Bank of New York. "The Post-Crisis Corporate CDS Market." Staff Reports. https://www.newyorkfed.org/medialibrary/media/research/staff_reports/sr879.pdf

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.