The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa Stock Photo

RMHNT3JG–The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa

RMHNT3J9–The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa

RMHNT3JA–The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa

RMHNT3HH–The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter is currently under investigation after being accused of insider trading. Photo: Arne Dedert/dpa

The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter (L) with the company's press officer Martin Halusa at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter is currently under investigation after accusations of insider trading were raised. Photo: Arne Dedert/dpa Stock Photo

RMHNT3FK–The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter (L) with the company's press officer Martin Halusa at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter is currently under investigation after accusations of insider trading were raised. Photo: Arne Dedert/dpa

Frankfurt am Main, Germany, 16 February 2017. The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa/Alamy Live News Stock Photo

RMHNT420–Frankfurt am Main, Germany, 16 February 2017. The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa/Alamy Live News

RMHNT41N–Frankfurt am Main, Germany, 16 February 2017. The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa/Alamy Live News

RMHNT41H–Frankfurt am Main, Germany, 16 February 2017. The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa/Alamy Live News

RMHNT422–Frankfurt am Main, Germany, 16 February 2017. The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa/Alamy Live News

RMHNT421–Frankfurt am Main, Germany, 16 February 2017. The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa/Alamy Live News

RMHNT41P–Frankfurt am Main, Germany, 16 February 2017. The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa/Alamy Live News

RMHNT41G–Frankfurt am Main, Germany, 16 February 2017. The CEO of the German equity trading firm Deutsche Börse AG Carsten Kengeter at a press conference at which the firm's annual figures were made public in Frankfurt am Main, Germany, 16 February 2017. Kengeter has been accused of insider trading and is currently under investigation. Photo: Arne Dedert/dpa/Alamy Live News