Who issues these, and why there is no canonical list. The contact list Washington's insurance regulator publishes for consumers names five firms: A.M. Best, Fitch Ratings, Moody's, Standard and Poor's, and Weiss Ratings. The National Association of Insurance Commissioners, in its own glossary, defines the regulatory category these firms sit in rather than the rating itself: a nationally recognized statistical rating organization, it says, "refers to rating organizations so designated by the SEC whose status has been confirmed by the Securities Valuation Office," and the examples it gives include a firm Washington's list leaves out, just as Washington's list includes one NAIC's examples leave out. The two lists are not identical, which is the useful fact rather than a discrepancy to resolve. There is no official roster of insurer raters, so a page or a salesperson referring to "the rating agencies" as a closed set is describing a convention, not a legal category.
The registration regime is not the rating. Designation as a nationally recognized statistical rating organization is a status granted under federal securities law: 15 U.S.C. 78c(a)(62) defines it as a credit rating agency whose ratings are certified by qualified institutional buyers with respect to one or more listed classes of obligor and which is registered with the Securities and Exchange Commission. NAIC's own definition routes the confirmation of that status through the SEC and the Securities Valuation Office. A firm can rate insurers without that status, and holding it says nothing about whether a particular grade is well founded. Do not read a registration as an endorsement of an opinion.
The scales are not comparable, and the regulator says so. Washington's page carries the caution directly: "Be aware that not all financial rating companies use the same rating processes." That has two practical consequences. A letter that looks near the top of one firm's scale may sit several steps down another's, because the number of steps and the labels differ. And two firms can reach different conclusions about the same insurer at the same time, because they are applying different methods to the same financial statements. A consumer comparing insurers has to compare like with like, which means reading two insurers' grades from the same firm rather than each insurer's best available grade.
Who pays for the rating. This is a fact about how the product is made, and it is worth stating because a reader assessing an opinion should know who commissioned it. Federal securities law's own definition contemplates every arrangement: 15 U.S.C. 78c(a)(61)(C) defines a credit rating agency as one "receiving fees from either issuers, investors, or other market participants, or a combination thereof." So the payer is not fixed by law, it varies by firm, and the firm is the one that discloses which arrangement it uses. What federal regulation does do is name the arrangement as a conflict rather than leave it to inference. For a nationally recognized statistical rating organization, 17 CFR 240.17g-5(b)(2) lists "being paid by obligors to determine credit ratings with respect to the obligors" as a conflict of interest, which the rating organization may not have unless it discloses the type of conflict and maintains procedures to manage it. So where the company being rated is the paying customer, the rating is not thereby wrong, but it is an opinion produced inside a relationship the Securities and Exchange Commission's own rule classifies as a conflict. Establishing which arrangement produced the grade in front of you is part of reading it, and the place to establish it is the rating firm's own disclosures rather than the insurer's marketing.
What regulators use instead, and why that matters to a consumer. Solvency supervision does not run on ratings. It runs on statutory accounting, which NAIC describes as a "method of accounting standards and principles used by state regulatory authorities to measure the financial condition of regulated companies," more conservative than the accounting most businesses use, and on risk-based capital, whose ratio NAIC defines as one "used to identify insurance companies that are poorly capitalized," calculated by dividing a company's capital by the minimum regulators have deemed necessary to support its operations. Those measures are the regulator's tripwires, not published consumer grades. A rating is a private opinion built partly on the same statutory filings, which is why a rating and a regulatory action can point the same way and why neither substitutes for the other.
Where the safety net sits. If a licensed insurer does fail, the state guaranty association pays covered claims up to limits each state sets, and it is funded by assessments on the surviving insurers rather than by a standing fund. That is a real backstop and it is deliberately not a selling point: on the life and health side the NAIC model act prohibits using the association's existence to induce a purchase and requires a disclaimer telling consumers not to rely on it when choosing an insurer. That prohibition is the clearest argument for reading a financial strength rating at all. The system that catches a failure has told buyers, in its own governing act, that they should not be choosing an insurer on the strength of the catch.
How much weight the rating deserves depends on how long the promise runs. For an auto policy renewing every six months, the insurer's finances matter much less than its claims handling and its price, because the relationship can be ended at the next renewal. For a deferred annuity, a whole life policy, a long-term care policy or a structured settlement, the promise comes due many years out, the buyer usually cannot move without a cost, and the insurer's ability to still be there is most of what was bought. The rating is a long-duration question, and that is where the reading effort belongs.