Massachusetts Attorney General Maura Healey filed a lawsuit against beleaguered credit reporting firm Equifax Inc. (EFX) - Get Equifax Inc. Report following the company's revelation that hackers compromised the data of 143 million Americans, including three million in the state. 

"Equifax knew about the vulnerabilities in its system for months, but utterly failed to keep the personal information of nearly three million Massachusetts residents safe from hackers," said Healey said in a statement.

Equifax shares have suffered in the aftermath of the revelation, losing about a third of their value over the last week. 

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"Equifax needs to pay for its mistakes, make our residents whole, and fix the problem so it never happens again," Healey concluded.

Equifax shares were up 0.34% to $94.70 in afternoon trading Tuesday. 

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