A method of implementing an Offer for Subscription or Offer for Sale. It is a compromise method of issue which draws on elements of a Fixed Price Offer and a Tender. Prior to the issue of shares, the issuing house conducts a bookbuilding exercise where it contacts investors and obtains commitments to purchase a number of shares at a specified price. Having established the demand for the shares over a two week period or so, the issuing manager sets the fixed price for the issue in line with the demand levels that have been established. Bookbuilding is a common method of implementing very large offers where the level of the issue price is difficult to determine in advance and where it is difficult to obtain underwriting for the issue.