Deutsche Boerse, the company that runs the Frankfurt stock exchange, launched a survey of market participants on Monday over increasing the size of its DAX index from 30 to 40 leading German companies, according to dpa. After a scandal over a missing 1.9 billion euros (2.2 billion dollars) in Wirecard, Deutsche Boerse also plans to stipulate that companies listed on DAX should be profitable - and not merely have high market value. Wirecard spent less than two years on the prestigious DAX list before being replaced by Delivery Hero, a rapidly expanding food delivery company that has shown successive losses, including in the first six months of this year. Under the proposals, the MDAX (Mid-Cap DAX) would see its listings cut to 50 from 60, while the SDAX would remain, at 70.