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A Deutsche Bank branch in Brussels, Belgium, on Dec. 6, 2022.

YVES HERMAN/Reuters

Deutsche Bank DB-N and Citigroup C-N admitted anti-competitive activity by exchanging sensitive information on U.K. government bonds between 2009 and 2013, Britain’s antitrust watchdog said, as it provisionally found five banks in breach of competition rules.

HSBC HSBC-N, Morgan Stanley MS-N and Royal Bank of Canada RY-T, meanwhile, have not admitted any wrongdoing over the alleged sharing of information in one or more one-to-one conversations between a small number of traders in Bloomberg chat rooms in the aftermath of the global financial crisis.

Britain’s Competition and Markets Authority (CMA) said in a statement on Wednesday it would consider further representations from the banks before reaching a final decision on its next steps and the possible issue of financial penalties.

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The CMA said the conversations are alleged to have related to the buying and selling of U.K. government bonds – specifically, gilts and gilt asset swaps – and included details on pricing and other aspects of trading strategies.

“These alleged activities are … very serious and warrant the detailed investigation we have undertaken. This could have denied taxpayers, pension savers and financial institutions the benefits of full competition for these products, including the minimization of borrowing costs,” said Michael Grenfell, Executive Director of Enforcement at the CMA.

The CMA said it was yet to decide if there was sufficient evidence of an infringement of competition law for it to take enforcement action against any of the banks. Until then, no assumption should be made that any of them had broken the law, it said.

Having alerted the CMA to its involvement via its leniency policy, Deutsche Bank will not be fined if the provisional findings are upheld. Citi also struck a settlement with the CMA and will also likely receive a discount if a fine is imposed.

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A Deutsche Bank spokesperson said it had secured “provisional immunity” after pro-actively reporting the activities, which took place before 2014. Citi said it had co-operated fully with the CMA on the matter and was “pleased to put it behind us.”

A spokesperson for Morgan Stanley said it disagreed with the CMA’s provisional findings and intended to contest them.

“Morgan Stanley co-operated fully with the watchdog during the investigation and will continue to engage in the process,” the spokesperson said.

HSBC denies the allegations and will continue to make its case while awaiting the CMA’s final decision, the bank told Reuters in an e-mailed statement.

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RBC told Reuters it disagreed with the CMA’s findings, but had co-operated fully with the investigation and took any allegation of employee misconduct very seriously.

In the wake of the financial crisis, the Bank of England shored up the U.K. economy and markets by buying U.K. government debt, also known as gilts, via regular buyback auctions.

Those auctions prompted some of the alleged exchanges of information among some of the banks involved, said the CMA, which launched the probe in November 2018.

Financial sector workers use Bloomberg chat rooms to communicate with customers and colleagues. The company, which is a Thomson Reuters competitor, is not being investigated.

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Bloomberg did not immediately respond to a request for comment.