Securities Exchange Act — 15 USC Sec. 10(b— - Rule 10b-5(a) - 17 C.F.R. Sec. 240.10b-5 — InsideTrainin— - SEC Version is an SEC rule that prohibits insider trading. The rule applies to all individuals, corporations, and entities that are registered with the Securities and Exchange Commission (SEC). It states that it is unlawful for any person to use material nonpublic information to trade in securities of an issuer, or to communicate such information for the purpose of trading. The rule specifically prohibits any person who is in possession of material nonpublic information regarding a security from buying or selling the security while in possession of the information. The rule also prohibits individuals from tipping, or providing material nonpublic information to another person in order to induce them to buy or sell a security. There are two types of insider trading violations under the rule: classical and misappropriation. Classical insider trading occurs when an individual in possession of material nonpublic information uses that information to buy or sell securities. Misappropriation insider trading occurs when an individual in possession of material nonpublic information provides that information to a third party for the purpose of trading.