Last year, the deal was thrown into question after the Sunnyvale, California-based web portal revealed widespread cyber attacks during Mayer's tenure that exposed hundreds of millions of users' online information.
In September, Yahoo disclosed a 2014 breach that affected at least 500 million customer accounts. Then, the company said in December that hackers in 2013 siphoned information including users' e-mail addresses, scrambled account passwords and dates of birth. In February, Yahoo and New York-based Verizon agreed to drop the purchase price by $350m (NZ$485m).
What remains of Yahoo after the sale, when the will be renamed Altaba, will be the most valuable parts of the current company: stakes in China's Alibaba Group Holding and Yahoo Japan that are worth more than $40 billion. Altaba, which will be led by current Yahoo director Thomas McInerney, will share ongoing legal responsibilities related to the security breaches.