Traders at Deutsche Bank AG, HSBC Holdings Plc, Societe Generale SA and Credit Agricole SA are under investigation for interest-rate manipulation in a global probe that led to a record fine for Barclays Plc last month, a person with knowledge of the matter said.

Regulators are examining the possible roles of Michael Zrihen at Credit Agricole, Didier Sander at HSBC and Christian Bittar at Deutsche Bank, said the person, who asked not to be identified because the probe is continuing. Investigators are focusing on their links to Philippe Moryoussef, an ex-trader at Barclays Plc, which was fined $451 million for rigging the euro and London interbank offered rates, the person said.

Barclays employees tried to manipulate Euribor and Libor for profit, while managers instructed rate-setters to make artificially low submissions to avoid the perception the lender was under stress amid turmoil in credit markets in 2007 and 2008. At least a dozen banks are being probed by regulators worldwide for rigging the rate, and regulators from Stockholm to Seoul are re-examining how benchmark rates are set amid concern they are just as vulnerable to manipulation as Libor.