By Max Colchester and Jenny Strasburg 

A U.K. regulator Thursday fined and banned two former senior executives at broker R.P. Martin Holdings for compliance failings in relation to rate-rigging.

The Financial Conduct Authority fined Martin Brokers' former chief executive, David Caplin, GBP210,000 ($317,824) and former compliance officer, Jeremy Kraft, GBP105,000. Both were banned from holding senior roles in the finance industry. The fines come eight months after the brokerage was fined for allegedly helping a trader rig an interbank lending benchmark.

"The FCA has found that Caplin and Kraft's failings contributed to a culture at Martins that permitted...manipulation to take place and enabled the misconduct to continue undetected over a prolonged period," the regulator said. The fine marks the first publicly disclosed penalty issued by the U.K. regulator against individuals in relation to rate-rigging.

The FCA said between 2005 and 2011 Mr. Caplin failed to put in place proper compliance controls to prevent brokers making or receiving "corrupt inducements." Mr. Kraft didn't challenge Mr. Caplin on compliance issues, in particular on the role of compliance staff in monitoring the front office, the FCA said. In May last year, the FCA fined Martins GBP630,000 for misconduct related to attempted manipulation of the London interbank offered rate.

Three Martins brokers allegedly helped a UBS AG trader to manipulate the Japanese Yen Libor rate. The trader rewarded Martins by placing a series of risk-free trades through the brokers, helping boost commission payments. The eventual FCA fine would have been significantly larger, but the broker was unable to pay. Mr. Caplin left Martin Brokers in 2013.

During the time in question Mr. Caplin was chief executive officer of RP Martin Holdings Ltd., owner of interdealer broker R.P. Martin. Mr. Kraft also was an executive of the firm, according to regulatory filings. R.P. Martin suspended Mr. Caplin in 2013 in connection with Libor inquiries.

London-based R.P. Martin Holdings last year was fined $2.3 million by regulators in the U.S. and U.K. over accusations of bribes related to Libor manipulation. R.P. Martin was originally fined more than $2.3 million, but the larger figure was discounted based on the firm's statements that it couldn't afford it. The firm said its senior management had cooperated with U.K. and U.S. regulators and accepted the $2.3 million fine.

At the end of 2014, R.P. Martin agreed to sell its primary assets to a rival interdealer broker.

Write to Max Colchester at max.colchester@wsj.com and Jenny Strasburg at jenny.strasburg@wsj.com

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