That takes £80 million off the fortune of CMC founder Peter Cruddas, who owns 57% of the firm. Cruddas was co-treasurer of the Conservative Party but quit following a cash-for-access scandal. Plus 500 — which said the move would have a “material” effect — lost 33% to 346p. Christopher Woolard, executive director at the FCA, said: “An increasing number of retail clients are trading in CFD products without an adequate understanding of the risks involved, and as a result can incur rapid, large and unexpected losses.