Neal Wolkoff will leave New York Mercantile Exchange at the end of the year, after 22 years at the exchange. No reason was given for the departure, other than that it was by 'mutual agreement'. Wolkoff's contract as coo expires at the end of the year and will not be renewed. An exchange spokeswoman said a replacement was not being sought at this time and that the responsibilities of Wolkoff's role will be shared between...