Hackers exploited a security vulnerability on Equifax’s website to gain unauthorized access to certain files. Stolen data includes consumers’ names, Social Security numbers, and birth dates for 143 million Americans, and in some instances, driving licence numbers and credit card numbers for about 209,000 citizens. Three senior executives at Equifax, namely John Gamble (CFO), Joseph Loughran and Rodolfo Ploder, sold almost $2 million worth of their shares just days after the company learned of this massive hack.
Source: https://thehackernews.com/2017/09/equifax-credit-report-hack.html