Investment Grade
BBB- (S&P) / Baa3 (Moody's) and above. Because most institutional investors are mandated to hold only IG bonds, the IG/HY divide carries implications far beyond a simple ratings boundary.
IG — One Line That Divides the World
By S&P standards, BBB- and above is Investment Grade (IG); below BBB- is speculative or "High Yield." Moody's boundary falls at Baa3/Ba1.
The difference one line makes is dramatic. A large portion of global insurer, pension fund, and sovereign wealth fund mandates restrict holdings to IG-or-above bonds. This means: the moment a bond is downgraded from BBB- to BB+, the world's largest pools of capital are structurally forced to sell it.
This is called "forced selling" or the "Fallen Angel" effect. It's why maintaining IG status is not merely a credit target but a strategic imperative for many corporates.
BBB — The Most Crowded Rating
Within IG, BBB (S&P: BBB+, BBB, BBB-) accounts for roughly 50% of the entire IG market — a concentration that creates systemic risk. If BBB-rated companies are mass-downgraded in a recession, the entire market absorbs the shock.
During the 2020 COVID crisis, large BBB companies like Ford and Boeing were downgraded to HY, triggering sharp spikes in HY spreads. "Fallen Angel risk" was the central DCM market theme of that period.
AA and A ratings are declining in number. In the U.S., only Microsoft and Johnson & Johnson currently hold AAA ratings.
Key Terms
A bond downgraded from IG to HY. Forces mandatory selling, causing spreads to spike sharply.
A bond upgraded from HY to IG. New IG mandated demand flows in, compressing spreads.
Where This Concept Appears
Learning Paths
Related Concepts
High Yield
Sub-investment-grade bonds rated BB+ and below. How the 'junk bond' market transformed leveraged buyouts and the entire corporate M&A ecosystem in the 1980s and beyond.
Spread & Basis
How much higher a bond's yield is versus the risk-free benchmark. This spread encapsulates the market's credit and liquidity assessment of the issuer.
The DCM Ecosystem Map
The global bond market is worth over $130 trillion — larger than equities. Yet many of the biggest buyers aren't here for yield. Understanding DCM starts with this paradox: a complete map of the issuer–investor–investment bank triangle.
Reach for Yield
The behavioral pattern where investors take on higher risk to meet yield targets in a low-rate environment. The backdrop behind Korea 1998's T+345bp spread — and the seed of many crises.