FRANKFURT AM MAIN (dpa-AFX) - The world's largest travel group Tui will return to the stock exchange in Frankfurt on Monday with the main listing of its share. Group CEO Sebastian Ebel and CFO Mathias Kiep will ring the traditional stock exchange bell at the start of trading in the regulated Prime Standard segment in the morning. The Group had moved the main listing of its shares to London at the end of 2014. The return to Frankfurt should now enable the company to enter the MDax, the German index for medium-sized companies. The Hanover-based company expects to be included in the index as early as June. The shareholders approved the change of location by a large majority in February./fjo/DP/mis