In addition to net capital requirements (described in more detail below), the SEC permits certain bond issuers to use a shorter prospectus form when issuing bonds if the issuer is older, has issued bonds before, and has a credit rating above a certain level. SEC regulations also require that money market funds (mutual funds that mimic the safety and liquidity of a bank savings deposit, but without U.S. Federal Deposit Insurance Corporation insurance) comprise only securities with a very high rating from an NRSRO. Likewise, insurance regulators use credit ratings from NRSROs to ascertain the strength of the reserves held by insurance companies.