Investment Grade Corporate Bonds

Investment grade corporate bonds (Investment Grade Corporate Bonds, IG) — are debt securities issued by companies with a credit rating of BBB– (Baa3 on the Moody's scale) and above; they form the foundation of fixed income in any diversified portfolio. The global IG bond market exceeds $10 trillion in face value, providing investors with predictable cash flow alongside moderate credit risk. For a large portfolio manager, IG bonds serve multiple strategic functions: generation of stable income (Income Generation) to cover current expenses, reduction of overall portfolio volatility (Volatility Reduction), provision of a liquid buffer (Liquidity Buffer) for tactical maneuvers, and formation of a collateral base (Collateral Base) for obtaining leverage.

Credit Analysis via Rating Agencies: Moody's, S&P, Fitch

Three global credit rating agencies (Credit Rating Agencies, CRA) — Moody's Investors Service, S&P Global Ratings, and Fitch Ratings — structure the system of credit assessment that determines the cost of borrowing for corporate issuers. The rating scale spans from the highest credit quality to default: AAA/Aaa (exceptionally strong debt servicing ability — only Microsoft and Johnson & Johnson maintain this rating among corporates) → AA/Aa (very strong) → A/A (strong) → BBB/Baa (adequate — the investment grade lower bound) → BB/Ba and below (speculative grade, High Yield). The rating outlook — Positive, Stable, Negative — indicates the likely direction of future rating change. Rating watch (Credit Watch/Rating Watch) is a short-term signal of a potential change within 90 days, usually tied to a specific event (M&A, restructuring, regulatory changes).

The methodology of credit analysis by rating agencies is based on assessment of several key factors: business profile — competitive position, diversification, entry barriers, revenue stability; financial profile — leverage (Leverage: Debt/EBITDA), interest coverage (Interest Coverage: EBITDA/Interest), cash flow generation, liquidity; management & strategy — financial policy, M&A strategy, dividend policy; industry risk — cyclicality, regulatory environment, technological changes; country risk — sovereign rating, political stability, legal system.

A critical approach to ratings: Despite the dominating role of rating agencies, their assessments have known limitations. Procyclicality — agencies tend to upgrade ratings during expansion phases and downgrade them in recessions, amplifying market cycles instead of smoothing them. Lag effect — rating actions often lag behind market assessments of credit risk by 3–6 months: CDS spreads (Credit Default Swap Spreads) and bond spreads begin to widen long before formal downgrades. Conflict of interest — the "issuer pays" model (Issuer-Pays Model) creates incentives to inflate ratings, which became clear during the 2008 financial crisis (large-scale downgrades of MBS and CDOs).

For institutional investors, it is recommended to conduct proprietary credit analysis and use ratings as only one of several inputs in the decision-making process, not as the sole criterion.

Analysis of Credit Spreads and Market Risk Assessment

Credit spread — the difference between the yield of a corporate bond and the yield of a risk-free government bond with a comparable maturity — is the market's measure of credit risk. The Option-Adjusted Spread (OAS) adjusts the spread for the value of embedded options (Call Option, Put Option), providing a more precise comparison among bonds with differing structures. Z-spread (Zero-Volatility Spread) is the spread to the zero-coupon yield curve, taking the full cash flow structure of the bond into account.

Current OAS for IG bonds: AAA/AA — 40–60 bps; A — 70–100 bps; BBB — 120–180 bps. Historical ranges are much wider: during the 2008–2009 financial crisis, IG spreads reached 600+ bps, creating exceptional buying opportunities.

Analysis of credit spread dynamics (Credit Spread Analysis) reveals the market's assessment of credit risk in real time — significantly ahead of rating agencies. Spread tightening signals an improvement in credit perception: "risk-on" sentiment, increased risk appetite, improvement of issuer fundamentals. Spread widening indicates deterioration: "risk-off" sentiment, increased probability of default, worsening market liquidity. Credit Spread Duration — the sensitivity of a bond's price to a 1 bps change in credit spread — determines the credit risk of the position.

For the portfolio manager, it is important to distinguish between systemic spread widening (spread increases across the entire market due to macroeconomic factors) and idiosyncratic spread widening (spread increase of a specific issuer due to company-specific problems).

Sector Rotation in IG: Financials, Utilities, Industrials

Sector rotation within the IG portfolio is an important source of alpha, based on different sector sensitivities to the macroeconomic cycle, interest rates, and credit conditions.

The financials sector — the largest segment in the IG index (~30% by weight), includes banks (JPMorgan, Bank of America, Goldman Sachs), insurance companies (Berkshire, MetLife), and financial companies (American Express, Capital One). Specificity: high yield curve sensitivity — banks profit from the spread between short and long rates (Net Interest Margin, NIM); regulatory capital (Regulatory Capital: CET1 Ratio) determines a bank's ability to pay coupons on subordinated debt; in recession, credit quality of financials deteriorates faster than other sectors due to rising provisions for credit losses.

The utilities sector — a defensive sector with regulated tariffs and predictable cash flows, accounting for ~8–10% of the IG index. Utility bonds have historically traded at narrower spreads (50–80 bps for A-rated utilities vs 80–110 bps for A-rated industrials) thanks to business model stability. However, the energy transition creates new risks: large-scale capital investments in renewable generation and grid infrastructure increase leverage; regulatory uncertainty impacts companies' ability to pass investments through to tariffs.

The industrial sector — the most diversified in terms of subsectors: capital goods, transportation, aerospace & defense. Economic cycle sensitivity is high, but M&A activity often creates event-driven opportunities: LBO (Leveraged Buyout) leads to worsening credit quality for the acquired company, and strategic debt-financed acquisitions temporarily widen the acquirer's spreads, creating entry points for the credit investor.

Practical implementation of sector rotation: In the early recovery phase of the economy (Early Recovery), increase the weight of financials (banks benefit from a steep yield curve and declining credit loss reserves); in the late-cycle phase (Late Cycle), increase weight of utilities and healthcare (defensive sectors with resilient cash flows); during recession, reduce the weight of cyclical sectors (industrials, materials) and increase government bonds' weight to protect capital.

Use the Bloomberg Barclays US Credit Index and its sector sub-indices for benchmarking and monitoring relative sector value.