Investment-Grade Rating

When a state or a large company needs money, it often borrows from many lenders at the same time. These lenders want to know beforehand how safe their money is. For this purpose, there are special firms that assess debtors and give them a grade. This grade usually consists of letters, for example AAA, BBB or B. If it turns out good, it is called an investment-grade rating, meaning roughly “investment quality.” The statement behind it is simple: this debtor will very likely repay its debts on time. If the grade turns out worse, it is called speculative grade or, colloquially, junk bonds.

The line at BBB− and what it triggers

The line between a good and a bad grade sits at a fixed point. At the major rating firms Standard & Poor’s and Fitch, the last good level is BBB−, at Moody’s it is called Baa3. One step below that, the speculative range begins. This line sounds arbitrary, but it has enormous consequences.

Many large investors, in fact, are only allowed to invest above this line. Insurers, pension funds and many funds have rules that forbid them from holding lower-rated debt instruments. If a company slips below the line, these investors must sell, even if they don’t want to at all. The price of the affected securities then often falls sharply. There is even a special term for such a crash: fallen angel.

Conversely, a good grade pays off in cash. Whoever is considered safe gets credit at lower interest rates. With a debt of one billion euros, a difference of just two percentage points can already mean 20 million euros per year. That is why chief financial officers fight hard to keep their rating.

How a credit rating comes about

A rating firm, also called a credit rating agency, looks closely at the debtor’s figures. What matters most is the ratio of debt to current earnings. A company that earns as much annually as it owes in total is considered robust. If it owes ten times its earnings, things become critical. On top of that come questions about cash reserves, payment deadlines, and how stable the business remains during a crisis.

The grade is not a purely mathematical exercise. In the end, a committee of analysts votes on it. It also factors in how management runs the business and how the entire industry is doing. For states, the agencies additionally look at political stability and tax revenues.

One distinction is important: a rating only assesses repayment risk, not the prospect of profit. A stock has no rating at all, because there is no repayment involved there. And even the top grade AAA is no guarantee. In the 2008 financial crisis, many AAA-rated securities crashed because the agencies had misjudged the risks. That is exactly what they were massively criticized for afterward.

Where the grade shows up in the news and in your own portfolio

In financial news you read sentences like “Moody’s lowers the outlook for France” or “Rating agency confirms BBB for the corporation.” Such announcements move prices within minutes. The intermediate step also counts: if a debtor is placed on the watch list, that is a warning of a possible downgrade.

You also encounter the term in your private life. Anyone buying a bond fund often finds the addition “Investment Grade” or “High Yield” in its name. The former sticks to the good grades and fluctuates less. The latter buys the worse ones and promises higher interest in return. These higher interest rates are not a gift, but payment for greater risk.

For technology companies, this topic has become more important in recent years. Anyone building huge data centers for artificial intelligence needs billions in borrowed capital for that. Corporations like Microsoft or Alphabet have top ratings and borrow money extremely cheaply. Smaller providers without a good rating pay significantly higher interest. The credit rating thus also decides who can even keep up in the race for AI computing power.