Three senior executives including the company's chief financial officer sold $1.8 million US in shares three days after the company learned on July 29 hackers had breached personal data for up to 143 million Americans. Equifax announced the breach publicly more than a month later, on Sept. 7. The news sparked public outcry, government investigations, a sharp drop in its share price and a management shake-up. Equifax lawyer Theodore Hester said in a letter dated Thursday to members of Congress announcing the review that the company "takes these matters seriously" and has retained lawyers.