The “Year of the Mega Breach” was upon companies in 2013, with an explosion of cyberattacks that exposed the identities of hundreds of millions more consumers than in 2012, a new analysis from Symantec Corp. shows.

Data breaches last year involved more than 552 million customers, almost six times the 93 million individuals affected in 2012, according to Symantec’s annual Internet Security Threat Report [PDF] released Tuesday. Companies in 2013 also reported 253 breaches, a 62 percent increase from the 156 infiltrations disclosed in 2012.