Equifax was reportedly hacked nearly five months before its first disclosed date

Equifax Disputes Report of Undisclosed Breach From March

The US Department of Justice has reportedly opened a criminal investigation into three top Equifax officials for possible insider trading, two sources tell Bloomberg. The Securities and Exchange Commission is working with prosecutors on the investigation into stock sales, according to another person familiar with the matter.

Equifax's stock has fallen 35 percent since the disclosure of the data hack.

The company denied in a statement to the news outlet that the March breach was tied to the hack in which the personal and financial information of as many as 143 million US consumers was exposed earlier this month. The company said in its initial announcement that it discovered the major leak on July 29th, which it disclosed on September 7.

The consumer credit agency initially said it detected a hack on July 29 - a date that was already causing problems because three of the company's senior executives sold off close to $1.8 million of their shares in the following days.

The DOJ did not immediately respond to a request for comment. All of the executives still owned thousands of shares of the company after the sales were completed, filings show.

The stock sales themselves are not enough to find them guilty of insider trading, despite the timing.

More than one third of USA senators have called on the Securities and Exchange Commission, in addition to the Justice Department, to get to the bottom of whether Equifax managers violated insider trading laws when they sold stock days after the company found out it was hacked.

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