National Association of Insurance Commissioners
The association of United States state insurance supervisors, coordinating regulation at federal level without replacing it. Publishes market data, line-of-business reports and reporting frameworks, including sector supplements. A primary source for the United States insurance market.
Aggregation of insurers' regulatory filings to state supervisors, normalised by the association. Coverage of the United States market is very broad; some detailed data is paywalled via the association's data marketplace.
Use for United States market data by line and the federated regulatory framework. A reference for situating the US market against European markets.