Bottom-Up Approach * Focus: Selecting individual bonds with superior risk-return profiles. * Analysis: Issuer-specific credit analysis (financial ratios, cash flow, collateral, management quality). * Relative Value: Comparing the credit spread of a bond to its peers (same sector, rating) or its own history. * Goal: Generate alpha through Security Selection. * Construction: The portfolio is built bond by bond; sector weights are a residual result of picking the best bonds. * Metrics: Use \(POD \times LGD\) (Probability of Default \(\times\) Loss Given Default) to estimate Expected Loss.
Top-Down Approach * Focus: Macroeconomic factors and broad market trends. * Analysis: Economic growth (GDP), corporate earnings cycle, default rates, credit conditions. * Allocation: Decide on overweight/underweight positions in broad sectors (e.g., High Yield vs. Investment Grade, Financials vs. Utilities, Emerging Markets vs. Developed). * Goal: Generate alpha through Sector Allocation and Credit Quality Allocation. * Construction: Determine sector weights first, then populate with representative securities.
1. Yield Spread (G-Spread): * Difference between the bond’s YTM and the YTM of a government bond with the same maturity (interpolated). * Limitation: Does not account for the term structure of interest rates (timing of cash flows).
2. I-Spread (Interpolated Spread): * Difference between the bond’s YTM and the swap rate (interpolated) for the same maturity. * Pros: Swap rates are often smoother and more available than government curves in some markets.
3. Z-Spread (Zero-Volatility Spread): * The constant spread added to the entire government spot rate curve that makes the present value of the bond’s cash flows equal to its market price. * Pros: Accounts for the timing of cash flows (slope of the yield curve). * Cons: Assumes no interest rate volatility (not suitable for bonds with embedded options).
4. Option-Adjusted Spread (OAS): * The spread added to the spot curve in an option-pricing model (like a binomial tree) to match the market price. * OAS = Z-Spread - Option Cost * For Callable Bonds: Option Cost > 0, so OAS < Z-Spread. * For Putable Bonds: Option Cost < 0, so OAS > Z-Spread. * Significance: The best measure for comparing bonds with embedded options. Managers seek bonds with high OAS relative to their credit risk.
Credit Market Liquidity: * Corporate bonds trade Over-The-Counter (OTC) and are far less liquid than government bonds or equities. * Liquidity Cost Score (LCS): Estimate of the round-trip cost (Bid-Ask spread) to trade a bond. * \(LCS = \frac{\text{Ask} - \text{Bid}}{\text{Mid Price}}\) * Liquidity Premium: Illiquid bonds trade at higher yields (wider spreads) to compensate for the inability to sell quickly. * Tail Risk: In crises, liquidity dries up; spreads widen dramatically. * Management: * Hold cash or liquid sovereigns (Treasuries) as a buffer. * Use ETFs or CDX (Credit Default Swap Indices) for liquid market exposure. * Ladder maturities to ensure natural liquidity from maturing bonds.
Credit Default Swap (CDS): * A contract where the Protection Buyer pays a periodic premium (coupon) to the Protection Seller in exchange for a payoff if a Credit Event (Default, Bankruptcy, Restructuring) occurs on the reference entity. * Pricing: * Spread > Fixed Coupon: Buyer pays upfront fee to Seller. * Spread < Fixed Coupon: Seller pays upfront fee to Buyer. * Approx. Price Change: \(\approx -\text{Duration} \times (\Delta \text{Spread})\).
Strategies: 1. Long/Short Credit: * Bullish: Sell Protection (Long Risk). Collect premium. * Bearish: Buy Protection (Short Risk). Pay premium. 2. Curve Trades: * Steepener: Buy protection on short-term (bearish short-term), Sell protection on long-term (bullish long-term). * Flattener: Sell protection on short-term, Buy protection on long-term. 3. Basis Trades: * Exploiting difference between the CDS spread and the bond’s Z-spread (Cash bond market vs. Synthetic market). * Negative Basis: CDS Spread < Bond Spread. Strategy: Buy Bond + Buy CDS Protection (Arbitrage profit). 4. Index Trades (CDX/iTraxx): * Used to instantly hedge portfolio-wide credit risk or take a directional view on the broad credit market (High Yield or Investment Grade) without trading individual bonds.
Tail Risk: The risk of extreme, rare events (left-tail events) causing massive losses (e.g., 2008 Crisis). Strategies: 1. Tail Risk Hedge: Buying deep out-of-the-money puts on credit indices or equities. (Costly “insurance premiums” bleed performance in normal years). 2. Barbell Strategy: Holding very safe assets (Govt bonds) + very risky assets (High Yield), avoiding the middle. 3. Diversification: Limiting exposure to single issuers/sectors. 4. CDS Protection: Buying protection on specific weak issuers or broad indices.
Emerging Market (EM) Debt: * Hard Currency: Denominated in USD/EUR. Pure credit spread play. * Local Currency: Denominated in local currency. Exposure to Credit + Interest Rates + FX rates. * Risks: Political risk, commodity price dependence, legal system weakness. Global Credit: * Managers can exploit differences in the credit cycle between regions (e.g., US in expansion vs. Europe in recession).