A registered security is a type of investment that is registered with the Securities and Exchange Commission (SEC). This type of investment is regulated by the SEC and offers investors certain protections. However, there are several synonyms for registered securities that investors may come across. These include listed securities, exchange-traded securities, SEC-registered securities, and regulated securities. These terms all refer to investments that are subject to regulatory oversight and provide investors with a level of protection. It is important for investors to understand the terminology associated with investment products in order to make informed investment decisions.