Verizon, 2013 Data Breach Investigations Report (Apr. 23, 2013) (full-text).
This annual report counted 621 confirmed data breaches last year, and more than 47,000 reported "security incidents." The victims spanned a wide range of industries. Thirty-seven percent of breached companies were financial firms; 24% were retailers and restaurants; 20% involved manufacturing, transportation and utility industries; and 20% of the breaches affected organizations that Verizon qualified as "information and professional services firms." (The totals exceed 100% because of rounding.)