UPDATE 1-Fenner contacts UK regulator about untrue claims

*Source says Fenner shareholders wrongly told by third party that company would issue negative statement

*Company says trading is satisfactory

LONDON, Oct 20 (Reuters) - British conveyor belt maker Fenner FENR.L said on Monday it had complained to the Financial Services Authority (FSA) that a third party was circulating "untrue" claims to some of its shareholders.

A source familiar with the matter told Reuters that an unknown entity told Fenner shareholders the company was about to issue a negative trading statement, which it was not.

“It has come to our attention that a number of shareholders have been approached by a third party purporting to be acting with Fenner’s consent in a manner that is in fact unauthorised by Fenner and are making representations that are untrue,” the company said in a statement.

The company said in its statement that trading was in fact satisfactory, and nothing had changed from its last trading statement on September 8.

The shares -- which have more than halved this year -- climbed 3 percent to 106.5 pence, valuing the firm at 186 million pounds ($324 million).

A spokeswoman for the FSA declined to comment. (Reporting by John Bowker; Editing by David Cowell)