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Data Debacles

There have been more than a dozen major losses of customer data this year. Here are the 10 largest as measured by number of affected customers.
Top 10 Customer Data-Loss Incidents
Company/Organization Number of
affected
customers
Date of
initial
disclosure
CardSystems
40 million
June 17
Citigroup
3.9 million
June 6
DSW Shoe Warehouse
1.4 million
March 8
Bank of America
1.2 million
Feb. 25
Time Warner
600,000
May 2
LexisNexis
310,000
March 9
Ameritrade
200,000
April 19
Polo Ralph Lauren
180,000
April 14
ChoicePoint
145,000
Feb. 15
Boston College
120,000
March 17
Source: InformationWeek, public disclosures by companies

Editor's Choice
Samuel Greengard, Contributing Reporter
Cynthia Harvey, Freelance Journalist, InformationWeek
Carrie Pallardy, Contributing Reporter
John Edwards, Technology Journalist & Author
Astrid Gobardhan, Data Privacy Officer, VFS Global
Sara Peters, Editor-in-Chief, InformationWeek / Network Computing