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Updated April 9, 2024

Credit Rating Agencies: Background and Regulatory Issues

Credit rating agencies (CRAs) provide investors with
evaluations of the creditworthiness of debt (i.e., how likely
a debt is to be repaid in full) issued by a wide spectrum of
entities, including corporations, sovereign nations, and
municipalities. Their ratings are typically a letter
hierarchical format (e.g., AAA as the safest, and
progressively lower grades-AA+, AA, AA-, A+, A, A-,
BBB, all the way down to D-representing greater risk).
For regulatory and investment purposes, ratings are placed
into two broad categories. Investment grade debt is rated
BBB- or Baa3 (depending on the CRA) or higher.
Noninvestment grade debt (also known as high yield or
junk bonds) has a rating below these benchmarks and is
generally associated with higher risk firms. This In Focus
examines CRAs, their regulation, and related policy issues.
Background and Early Regu ation
In 1975, the Securities and Exchange Commission (SEC)
adopted the designations of nationally recognized statistical
rating organizations (NRSROs). NRSROs were originally
used to help determine capital charges on different grades
of debt securities held by broker-dealers under the SEC's
net capital rule (Rule 15c3-1 under the Securities Exchange
Act of 1934). The net capital rule is aimed at ensuring that
broker-dealers maintain sufficient liquid assets to promptly
satisfy their liabilities if needed.
When the SEC began using ratings to enforce the net capital
rule in 1975, the SEC staff, in consultation with agency
commissioners, determined that the ratings of the three
dominant agencies-Standard & Poor's (S&P), Moody's,
and Fitch-were nationally used and were thus generally
considered NRSROs with respect to SEC enforcement of
the net capital rule. Between 1975 and 2000, the SEC added
four more NRSROs to the original three. The SEC never
defined the term NRSRO or specified how a CRA might
become one. Its approach was essentially described as one
of we know it when we see it. As of March 2024, there
were 10 NRSROs-three categorized by the SEC as large
(S&P, Moody's, and Fitch) and garnering 91% of
revenue-three as medium, and four as small.
In 2006, Congress passed the Credit Rating Agency Reform
Act (P.L. 109-291), which amended the Securities
Exchange Act of 1934 to try to improve ratings quality for
the protection of investors by fostering accountability,
transparency, and competition in the credit rating industry.
Among other things, P.L. 109-291 added Section 15E to the
Securities Exchange Act, which established SEC oversight
over those CRAs that register as NRSROs. It also provided
the SEC with examination authority and established a
registration program for CRAs seeking NRSRO
designation. NRSRO applicants and registered NRSROs
were required to disclose ratings performance, conflicts of
interest, and the procedures used to determine ratings.

Under the law, the SEC was also authorized to conduct
annual deficiency and compliance examinations at
NRSROs, which are not publicly identified.
The Financial Crisis and Dodd-Frank Changes
In the run-up to the financial crisis of 2007-2009, the
provision of investment grade ratings by the three dominant
CRAs-S&P, Moody's, and Fitch-for structured finance
securities was widely seen as a critical part of the process of
structuring the residential mortgage-backed securities
(MBS) and collateralized debt obligations that held
subprime housing mortgages. The issuance of private MBS
reportedly grew from $126 billion in 2000 to $1.145 trillion
in 2006.
Various reporting, including the 2011 Financial Crisis
Inquiry Report, argued that the three leading CRAs
fundamentally failed in their ratings of these securities,
exacerbating the market collapse. During the housing boom
preceding the financial crisis, the CRAs often gave top-tier
AAA ratings to many structured securities only to
downgrade many of them later to levels often below
investment grade. CRA ratings on corporate bonds
reportedly did not encounter the same problems. Criticism
of the CRAs, however, was not universal. A frequent
defense of their failings was that their rating missteps could
be traced in part to their view that rising housing prices
would be sustained, a perspective also said to be held by a
number of respected financial market observers at the time.
Critics of CRAs argue that overly favorable ratings were in
place heading into the crisis because of the issuer-pays
model used by the CRAs. CRAs are typically paid by the
issuers of the securities being rated by the agencies, which
many see as a conflict of interest (Financial Crisis Inquiry
Report, 2011). Rating structured finance became a
substantial revenue generator for the CRAs. For example,
according to some reporting (Morgenson, New York Times,
2008), by the first quarter of 2007, such ratings constituted
53% of Moody's total revenue. In addition, ratings
shopping-wherein structured finance issuers shopped for
CRAs offering potentially more favorable ratings-may
have played a role (Zhou and Kumar, 2012). Other possible
causes of the allegedly inflated structured product ratings
included the following:
* The CRA industry is highly concentrated (Financial
Crisis Inquiry Report, 2011). According to recent SEC
data, S&P, Moody's, and Fitch issued about 95% of
outstanding ratings.
* Despite high profits, the CRAs reportedly suffered from
inadequate staffing, exercise of due diligence, and use of
internal controls and a failure to properly update their
rating models (Brookings, 2017).

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