Steven Whelton has been appointed as interim replacement.
Mark Slade buys 200,000 LCG shares for about $114,000, to hold about 0.5% of the company.
Investors dumping LCG after takeover talks called off with City Index.
City Index was apparently the last to withdraw from takeover talks.
Cantor Fitzgerald, Gain Capital (Forex.com), and City Index have made "preliminary approaches" to LCG.
LCG shares shoot up 11% on Monday with no apparent new news.
Online betting company BetVictor adds financial trading.