Packaged Linux leader Red Hat Inc has filled in some of the blanks on its plans for an initial public offering which were first announced last month. In an amended filing with the Securities and Exchange Commission, the Durham, North Carolina- based company said it will sell 6 million shares at a range of $10 to $12 each, raising a maximum of $72m. Red Hat estimates that, at the middle of the range, the company would come away with $60.1m after expenses. The shares sold in the offering will represent 9% of the 66.6 million total shares to be outstanding after the IPO. Underwriters, including leader Goldman Sachs & Co, have been granted an over-allotment option of 800,000 shares.