Welcome to Fixed-Income Active Management: Credit Strategies!

Hello there! If you’ve made it to CFA Level III, you already know that bonds aren't just about collecting coupons. In the world of Credit Strategies, we are shifting our focus from interest rate movements (Duration) to the risk of the borrower themselves. We’ll learn how to pick the right bonds, manage the "spread" over risk-free rates, and use cool tools like Credit Default Swaps (CDS) to boost returns or protect our skins. Don't worry if this seems a bit technical at first—we'll break it down piece by piece!

1. Understanding Credit Spreads

When you lend money to a corporation instead of the government, you want a little "extra" return to compensate you for the risk that they might go bust. That "extra" is the Credit Spread.

Key Spread Measures

To be a pro, you need to know which "yardstick" to use to measure this spread:

  • G-Spread: The difference between a corporate bond's yield and a government bond's yield with the same maturity. (Simple, but government bonds often have different liquidity).
  • I-Spread (Interpolated Spread): The spread over the Swap Rate. This is popular in Europe and for many global investors because the swap market is very liquid.
  • Z-Spread (Zero-Volatility Spread): A constant spread added to the risk-free spot rate curve to make the bond's price equal its market value. It’s more accurate than G-spread for different cash flow timings.
  • OAS (Option-Adjusted Spread): The "gold standard." It takes the Z-spread and removes the impact of embedded options (like if a bond is callable). OAS is the spread you get for just the credit risk.

Quick Review: If a bond has a call option, the Z-spread will be higher than the OAS because the Z-spread includes the cost of the option you sold to the issuer. OAS = Z-spread - Option Cost.

2. Calculating Expected Returns in Credit

This is a favorite topic for the exam! How do we estimate what we will actually earn from a credit bond over a short period? We use a specific formula for Expected Excess Return (the return above the risk-free rate).

The formula looks like this:
\( E[R] \approx (\text{Spread} \times t) - (\Delta \text{Spread} \times \text{EffSpreadDur}) - (t \times p \times L) \)

Let's break that down into English:

  1. (Spread \(\times\) t): This is the "carry." You earn the spread just by holding the bond over time (\(t\)).
  2. -(\(\Delta\) Spread \(\times\) EffSpreadDur): If spreads go up, your bond price goes down. This measures that price change. (Remember: Spread and Price move in opposite directions!)
  3. -(t \(\times\) p \(\times\) L): This is the "Expected Loss." It’s the probability of default (\(p\)) times the loss severity (\(L\)).

Common Mistake to Avoid: When calculating the price change, make sure you use Spread Duration, not Interest Rate Duration, though for many corporate bonds they are the same value.

Key Takeaway: To maximize excess return, you want a high starting spread, a decreasing spread over time, and zero defaults.

3. Credit Strategy: Yield Curve & Relative Value

Just like the government yield curve, the Credit Spread Curve usually slopes upward. This means longer-term debt usually has a higher spread than short-term debt.

Static vs. Active Positioning

If you think the market will stay stable, you might "Ride the Spread Curve." As time passes, the bond's maturity shortens, and it "rolls down" the curve to a lower spread, which increases its price. This is just like "riding the yield curve" in government bonds!

Relative Value Analysis

This is where the "detective work" happens. Active managers look for mispriced bonds:

  • Bottom-up: Looking at individual companies. Is Company A's spread too high compared to its actual risk? If yes, buy it!
  • Top-down: Looking at the big picture. Should we be in high-yield bonds or investment-grade bonds right now?

Analogy: Think of relative value like shopping. If two identical shirts are on sale, but one is \$20 and the other is \$30, you buy the \$20 one. In credit, if two companies have the same risk, you buy the one with the higher spread (the cheaper bond).

4. Using Credit Default Swaps (CDS)

A CDS is like an insurance policy against a company defaulting. It has revolutionized credit management.

  • Buying Protection (Long CDS): You pay a premium. You are "Short Credit." You win if the company defaults or its credit quality gets worse.
  • Selling Protection (Short CDS): You receive a premium. You are "Long Credit." You win if the company stays healthy.

Why use CDS instead of cash bonds?

  1. Liquidity: It's often easier to trade a CDS than a specific physical bond.
  2. Shorting: It is very difficult to "short" a physical bond, but very easy to "buy protection" on a CDS.
  3. Customization: You can target specific parts of the credit curve.

Did you know? There are CDS Indices (like CDX in North America and iTraxx in Europe). These allow investors to bet on the health of the entire corporate market at once!

5. Structured Credit: A Brief Mention

In Level III, we focus on Asset-Backed Securities (ABS) and Collateralized Debt Obligations (CDOs). The key here is the "waterfall" structure. Payments go to the Senior Tranches first (lowest risk, lowest return), then the Mezzanine Tranches, and finally the Equity/Residual Tranche (highest risk, highest potential return).

Key Takeaway: Structured credit allows investors to pick the exact "slice" of risk they are comfortable with.

6. International Credit Investing

When you invest in credit outside your home country, you add two new layers of complexity:

  1. Currency Risk: If the foreign currency drops, your returns drop. Managers often hedge this back to their home currency.
  2. Legal/Regulatory Risk: Bankruptcy laws are different in every country. In some places, it's very hard for bondholders to get their money back if a company fails.

Pro Tip: Even if a foreign bond has a higher spread, after you pay for the currency hedge, the "hedged return" might be lower than your local bonds. Always calculate the Hedged Return before committing!

7. Tail Risk and Liquidity

Credit markets are famous for "going to sleep" when things get bad. This is Liquidity Risk. During a crisis, you might not be able to sell your bonds at any reasonable price.

Tail Risk refers to those rare, extreme events (the "Black Swans"). Managers manage this by:

  • Diversification: Not putting all eggs in one basket.
  • CDS: Using protection to limit losses.
  • Position Sizing: Keeping the most illiquid bonds as a small part of the portfolio.

Summary of Credit Strategies:
- If you are Bullish on the economy: Increase credit exposure, move down in quality (High Yield), and increase Spread Duration.
- If you are Bearish on the economy: Decrease credit exposure, move up in quality (Government/AAA), and shorten Spread Duration.

Keep pushing forward! You're doing great. Understanding credit is a huge part of the Level III mountain, and you've just taken a massive step toward the summit!