Deutsche Börse's latest attempt to bolster the image of its high-growth exchange, the Neuer Markt, may have been greeted with approval from fund managers but it failed to stop its Nemax 50 index sliding nearly 6%.

The German stock exchange plans to delist insolvent companies and firms with a market capitalisation under €20m ($17.5m) or a share price under €1. This will probably lead to about 25 companies fall out of the Neuer Markt.