Mexico City — Mexico’s securities regulator has fined top banks, traders and brokers for simulating bond trades to pump up volumes, according to a government document and source, in one of the country’s widest probes into the industry since the financial crisis. Citigroup unit Citibanamex, Spain’s BBVA Bancomer, Britain’s Barclays, Switzerland’s Credit Suisse and Germany’s Deutsche Bank have been notified of the fines, according to the document. The fines for the banks, eight traders and two brokers totalled more than $1m, according to a government source with direct knowledge of the matter. Those sanctioned can still appeal against the fines. Citibanamex said in a statement it was aware of the fines and was evaluating whether to appeal. Barclays, Credit Suisse and Deutsche Bank declined to comment. BBVA Bancomer did not respond to a request for comment. Over the last decade, regulators in the US, Britain and other markets have slapped banks with billions of dollars in fines for man...

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