Researching investments is part of an investor’s due diligence. Companies must provide certain information when they initially offer stocks or bonds for sale to the public. Companies and bond issuers must also must provide certain information to the public periodically. These disclosures provide investors with information to judge whether a particular security is a good investment. If a company is not registered with the SEC, or a bond issuer is not registered with the Municipal Securities Rulemaking Board (MSRB), it could be a red flag. Scams often involve unregistered companies.