https://www.cnbc.com/2017/09/14/there-are-hundreds-of-companies-besides-equifax-tracking-what-you-do.html >Consumers finding that their personal data may have been exposed in the massive Equifax cyberattack might be surprised to learn how many companies have access to different bits of their personal information. >The credit-reporting company announced last week that the personal information of over 140 million Americans could have been accessed by hackers between May and July. Why is that number so big? Equifax is one of the "Big Three" credit reporting companies operating in the U.S. TransUnion and Experian are the other big ones.