NetGravity Inc, San Mateo, California provider of internet advertising services and software has filed a registration statement with the Securities and Exchange Commission for an initial public offering of 3 million shares of common stock, all of which will be offered by the company. The current proposed offering price is $9 to $11 per share, which will raise up to $33m for the company, minus fees. The offering will be managed by BancAmerica Robertson Stephens, NationsBanc Montgomery Securities LLC and First Albany Corp. The underwriters have also been granted an option to purchase an additional 250,000 and 200,000 shares of common stock by the company and certain stockholders, respectively, to cover any over-allotments. NetGravity markets its AdServer software products which are designed to enhance the efficiency of the online advertising and direct marketing supply chain through analysis of historical data, forecasting of advertising inventory capacities and the delivery of availability reports. Report-generating functions also reveal information on the performance of online advertisements.