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Former Equifax boss Richard Smith testified before US Congress about the breach, which affected more than 145 million people
Equifax quarterly profits plunged 27% and revenue growth was lower in the most recent quarter, as the credit bureau grappled with fallout from a major data breach.
The firm has said personal information about more than 145 million people in the US and the UK may have been exposed.
The head of the firm said it had "an important journey" to regain trust.
"I have high confidence ... we will emerge from this an even stronger company," said interim chief executive Paulino Barros, who was installed after the previous boss resigned.
But revenue in the period rose just 4%, reaching $ 834.8m (£ 635.5m ), as its US business declined.
Profits in the three month s to the end of September were $ 96.3m, down 27% as expenses climbed.
