Finney, the senior executive of Castle Securities in the Asia-Pacific region, is reported to have resigned.

Sources familiar with the matter say that Jonathan Finney, Managing Director of Castle Securities' Asia-Pacific business development, has left the company owned by Ken Griffin. According to sources who declined to be named because they were discussing non-public information, Finney also served as the Chief Operating Officer of the company's options business in the Asia-Pacific region and resigned earlier this month. A representative of Castle Securities declined to comment. Finney did not immediately respond to a message seeking comment on LinkedIn.