The financial services group is conducting its third and final call option of Tradegate shares in order to build on its current stake of approximately 15 percent.
Deutsche Börse previously increased its initial 5 percent stake to 15 percent in 2014.
Tradegate is an active liquidity provider on a number of German exchanges. BNP Paribas has held a mandate to manage its securities services including securities lending and clearing activities since July.
Deutsche Börse also acquired a 75 percent stake in Berlin-based Tradegate Exchange in 2010, along with Tradegate.