A roster is a list a state publishes of the companies it recognizes to sell or administer service contracts in that state. Checking one is a useful step before you compare offers. It tells you whether a name appears on that list on the list's as-of date. It does not tell you the quality of the company, the price of its contract, or whether a claim will be paid.
What a roster listing shows
Look for the exact legal name of the seller and of the company that holds the obligation to pay claims. These are often different companies. Check the registration or license number, the as-of date printed on the roster, and the state that published it. A company may use a trade name on the sales paper while its legal name is on the roster, so match both.
What a listing does not show
Registration is not a quality rating. A listing does not mean that any particular repair is covered, does not measure how fast claims are handled, and does not set the price. Treat the roster as a yes or no on recognition, and nothing more.
When a state does not publish a roster
Some states do not publish a roster for service contract sellers, and some print a roster that is not complete. In that case, ask the seller which state filing or program applies, and ask for the statute number. This guide has not read every state's roster rules. The state pages on this site, such as Alabama service contract rules and roster, show the rules each state page has been read against, and the page for your state tells you whether a roster exists.
Compare the offers on the same terms
After each name is checked, compare the contracts on the same terms: who pays, what the claim limit is, how cancellation works, and what the exclusions are. A roster check narrows the list. It does not replace the comparison.