Shelf registration, shelf offering, or shelf prospectus is a type of public offering where certain issuers are allowed to offer and sell securities to the public without a separate prospectus for each act of offering and without the issue of further prospectus. Instead, there is a single prospectus for multiple, undefined future offerings. The prospectus (often as part of a registration statement) may be used to offer securities for up to several years after its publication. A shelf registration statement is a filing with the SEC to register a public offering, usually where there is no present intention to immediately sell all the securities being registered. A shelf registration statement permits multiple offerings based on the same registration. Shelf registration is mostly used for sales of new securities by the issuer (primary offerings), although it might possibly be used for resales of outstanding securities (secondary offerings) or a combination of both.

For example, a company can file a shelf registration statement with a prospectus for 100,000,000 shares, $1,000,000,000 face value of bonds, $500,000,000 face value of convertible bonds, 50,000,000 Series A warrants, and 50,000,000 Series B warrants. These five different classes or series of securities are offered in a single document. The company may offer to sell all of them, none of them, or any part of some class. It can sell 30,000,000 shares at one time and another 50,000,000 a year later (it will then have 20,000,000 unissued shares covered by the shelf prospectus).

Before each offering and sale is actually made, the company must file a relatively short statement regarding material changes in its business and finances since the shelf prospectus was filed.

Shelf registration is usually available to companies deemed reliable by the securities regulation authority in the relevant country. Because of their purposefully time-constrained nature, shelf offerings are examined far less rigorously by those authorities than standard public offerings.