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The Financial Times  /  September 23, 2016

Yahoo President and CEO Marissa Mayer has known since July that Yahoo was investigating allegations of a serious data breach, raising questions about whether the internet chief withheld information from investors, regulators and its acquirer Verizon until this week.

The initial investigation found no evidence for the claim in July by a hacker known as “Peace” that details of more than 200 million accounts had been accessed, but concern about the allegation triggered a deeper probe.

That investigation uncovered what Yahoo on Thursday called a state-sponsored hack affecting more than 500 million accounts.

Yahoo has refused to say exactly when it discovered the theft, which took place in 2014, of account details including phone numbers, birth dates and certain security details, which ranks as the largest known data breach in history.

Verizon, which agreed a $4.8bn bid for Yahoo’s core business in July, said it had been informed as recently as this Tuesday, 10 days after a September 9 regulatory filing to the US Securities and Exchange Commission in which Yahoo said it had no knowledge of “any incidents” of “security breaches, unauthorised access or unauthorised use” of its IT systems.

“Marissa was aware absolutely — she was aware and involved when Peace surfaced this allegation in July,” a person briefed on Yahoo’s discussions said.

“[She] was part of the investigation and conversation from the very beginning and along with the team every step of the evidentiary gathering and analysis process. In fact, the key executive team has been engaged from the very beginning.”

Ms Mayer’s knowledge of events suggests that the SEC could intervene, lawyers and former officials said.

In its SEC filing earlier this month, Yahoo also confirmed that to its knowledge, the company had not received any notice of any claims or investigations relating to personal data that could “reasonably be expected to have a Business Material Adverse Effect”.

A Yahoo spokesperson said: “We believe we’ve been truthful in our representations.”

Ms Mayer’s judgment in holding back information about the investigation is already being challenged.

 “This is unprecedented in its timing, in that the deal is still between signing and closing,” he said. “This will affect the reputation of the business, it will cost money to fix and it will take a long time — the consequences of this will go on for many months, if not years.”

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