shelf offerings don't actually need to be sold and can sit on the shelf for two years...is 8x8 a wksi company?a poison pill?
'Shelf registration or shelf offering 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. 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.
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. Shelf offerings, due to their purposefully time-constrained nature, are examined far less rigorously by those authorities, compared to standard public offerings.
 United States
Shelf registration is a process authorized by the U.S. Securities and Exchange Commission under Rule 415 that allows a single registration document to be filed by a company that permits the issuance of multiple securities. Form S-3 issuers may use shelf-registration to register securities that will be offered on an immediate, continuous or delayed basis' see wiki:============================?poison pill?.