Stock issue can be alternatively referred to as a stock offering, equity offering, or share issuance. It is a process by which a company offers its shares to the public for sale. Other possible synonyms for stock issue include initial public offering (IPO), secondary offering, or follow-on offering. An IPO is a type of stock issue that marks the first time a privately owned company becomes publicly traded. A secondary offering, on the other hand, occurs when a company that is already publicly traded issues additional shares to the public. A follow-on offering is similar to a secondary offering, but it is limited to existing shareholders.