"The Lost Symbol" had been in development for several years; originally expected in 2006, the projected publication date was pushed back multiple times. When officially announced, the hardcopy book was on pre-order lists for months leading up to its release, being heavily ordered both in the United States and Canada. The book was published on September 15, 2009 with an initial print run of 6.5 million copies, the largest first printing in publisher Random House's history. Electronic versions such as eBook and Audible book versions were also made available on the same date. The American release audio book was read by Paul Michael, who also performed the audio book for "The Da Vinci Code".