Frankfurt, December 28 The Frankfurt stock exchange said today that 24 companies went public in 2015, the highest number of initial public offerings (IPOs) since 2007. In terms of size of capital raised from new listings, this year was also the best in eight years, with the total issue volume amounting to seven billion euros, Deutsche Boerse said. By comparison, 19 companies went public in 2014 with a total volume of four billion euros. The single biggest IPO was Covestro, the polymers division of chemicals and pharmaceuticals giant Bayer, which raised 1.5 billion euros when it went public in the month of October. In 2016, the most eagerly awaited IPOs will include divisions of the two energy giants E.ON and RWE.