Online advertising company DoubleClick is getting closer to launching its IPO. The company registered 3.45 million shares and will float out 3 million shares of stock at $16 to $17 per share. The remaining 450,000 shares will be available solely to underwriters, which include Goldman Sachs, BT Alex. Brown, and Cowen & Company, to cover over-allotments. The company will be listed on the Nasdaq under the symbol "DCLK."