LONDON--A top executive at brokerage firm ICAP PLC (IAP.LN, IAPLY) knew of an arrangement with UBS AG (UBS, UBSN.VX) that U.S. and British regulators allege was part of a scheme to rig benchmark interest rates, according to people familiar with the matter.

The ICAP executive, David Casterton, was included on emails between ICAP and UBS officials in 2007 as they negotiated a deal that regulators say was designed to compensate ICAP brokers for helping UBS traders manipulate the London interbank offered rate, or Libor, these people say. Mr. Casterton ultimately signed off on the arrangement, they say.

British regulators have described the arrangement, which they say involved UBS making quarterly payments to ICAP allegedly to reward brokers for helping rig Libor, as "corrupt." The Swiss bank admitted wrongdoing when it settled Libor-rigging charges with U.S. and British authorities last December.

That Mr. Casterton knew of the arrangement with UBS hasn't been disputed. But ICAP officials have told U.K. regulators that the arrangements have been misconstrued and were appropriate commercial transactions, according to people familiar with the discussions. ICAP and Mr. Casterton haven't been accused of wrongdoing.

"Neither the company nor its senior management was aware of any corrupt payment from any source at any time," said ICAP spokeswoman Brigitte Trafford. "All payments received from UBS were documented and invoiced. ICAP strongly refutes that Mr. Casterton or anybody else in ICAP senior management were ever aware of, or involved in, any improper activities in relation to the attempted manipulation of yen Libor. Any suggestion otherwise is false and defamatory."

Mr. Casterton didn't respond to requests for comment. The 18-year ICAP veteran and a longtime deputy to Chief Executive Michael Spencer would be one of the most senior finance executives to be drawn into the Libor saga.

Known by colleagues as "Clumpy," Mr. Casterton is head of global broking at the London-based firm, which describes itself as the world's largest interdealer broker, helping facilitate transactions among financial institutions. In 2007, when the transactions in question were allegedly arranged, Mr. Casterton was responsible for ICAP's interest-rate-derivatives business, among other functions.

ICAP has previously said it is cooperating with U.S. and British authorities investigating the brokerage firm as part of their rate-manipulation probes. The firm has suspended or put on administrative leave a handful of brokers in connection with the Libor investigation, but no senior executives, according to a person familiar with the matter.

The inclusion of Mr. Casterton on emails about the alleged Libor-related payments is the latest example of top industry executives supposedly knowing their subordinates were involved in activities that authorities now describe as improper.

Barclays PLC (BCS, BARC.LN) Chief Executive Bob Diamond and Chief Operating Officer Jerry del Missier resigned last summer after the British bank settled accusations it tried to manipulate rates, in some instances allegedly at the behest of Messrs. Diamond and del Missier. Documents released by U.K. Parliament showed the two executives instructed their subordinates to submit artificially low Libor data. While Barclays admitted wrongdoing, both former executives denied doing anything improper.

A senior UBS executive, Carsten Kengeter, resigned in February, days after The Wall Street Journal reported he had been on internal emails that discussed the abilities of a UBS trader to influence Libor. UBS said Mr. Kengeter's departure wasn't related to the Libor disclosures. Mr. Kengeter declined to comment.

And two top executives at R.P. Martin Holdings Ltd., a small London interdealer brokerage, recently were suspended amid a British investigation into the roles allegedly played by R.P. Martin brokers in the Libor scandal. The company hasn't been charged with wrongdoing, and a representative declined to comment.

The U.K.'s criminal investigation of alleged Libor rigging is continuing.

Last week, fraud prosecutors charged former UBS and Citigroup Inc. (C) trader Tom Hayes with eight counts of allegedly conspiring to defraud by manipulating rates. Two of those counts relate to Mr. Hayes's alleged efforts to manipulate Libor with the help of ICAP employees, prosecutors said.

Mr. Hayes, who also has been charged with fraud in the U.S., hasn't entered a plea to either country's charges. He wrote in a January text message to The Wall Street Journal that "this goes much much higher than me."

The payments between UBS and ICAP came to light last December when UBS settled rate-rigging charges with U.S. and British authorities. In public settlement documents, the U.S. Commodity Futures Trading Commission and the U.K.'s Financial Services Authority said UBS traders enlisted employees at interdealer brokers to help manipulate Libor and other benchmarks.

To reward the brokers for their help, the UBS employees provided various brokers with commission-generating trades and other types of compensation, the regulators said.

In ICAP's case, UBS in 2007 arranged for a "special compensation package" to be paid to a helpful broker and his colleagues, according to the CFTC and FSA settlement documents. Neither regulator identified ICAP by name, but people familiar with the investigation said the firm is ICAP.

The package allegedly included a quarterly "fixing service" payment of about $27,000 that was shared among several ICAP employees. One broker personally received about $9,000 per quarter, according to the CFTC. The package was in place for nearly two years, generating a total of about $216,000 for the brokers, the CFTC said.

The CFTC said the payments to the brokers were "in return for their unlawful assistance." The FSA, now known as the Financial Conduct Authority, described the transactions as "corrupt payments."

ICAP officials are telling regulators they have misinterpreted the nature of the transactions, according to the people familiar with the discussions. The officials say the UBS payments were based on transactions ICAP handled for the Swiss bank and weren't related to Libor, and that they aren't aware of any payments going from UBS directly to any individual ICAP brokers, these people say.

The transactions were negotiated at least in part via email, and the correspondence is now in the hands of regulators, according to the people familiar with the matter. Mr. Casterton, who was on some of the emails, approved the deal, the people said.

Write to David Enrich at david.enrich@wsj.com

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