Charles Susi, head of institutional sales & electronic trading at KCG, has announced internally that he is leaving the firm, according to people briefed on the departure.
The senior exit comes a day before KCG reports earnings on Thursday, with the company currently under offer from rival Virtu.
Susi joined KCG in 2013 shortly after it was created from the merger between Knight Capital and Getco. He joined from UBS, the same former firm as then and current KCG chief executive Daniel Coleman.
KCG declined comment.