There were several high profile breaches in 2015 in a number of industries including healthcare, government, education, retail, and finance. The top 15 breaches have been highlighted below:

Anthem (healthcare): Breach occurred February 10 and the personal information of 80 million patient records was breached.

Premera Blue Cross (healthcare): Breach occurred March 20 and both the personal and financial date of 11 million patients was breached.

UCLA Health System (healthcare): Breach occurred May 5. Both the personal information and medical records of 4.5 million patients was breached.

CareFirst BlueCross BlueShield (healthcare): Breach occurred May 20 and the personal information of 1.1 million patients was breached.

IRS Washington DC (government): Breach occurred May 26 and the financial data of 100,000 patients was breached.

Japan Pension Service (government): Breach occurred June 1 and the personal information of 1 million people was breached.

US Office of Personnel Management (government): Breach occurred June 4 and the personal information of 21.5 million people was breached.

Hacking Team (IT): Breach occurred on July 7 and an undetermined number of trade secrets were breached.

Ashley Madison (commercial): Breach occurred on July 21 and the personal information of 37 million records were breached.

Excellsus BlueCross BlueShield (healthcare): Breach occurred on September 10. Both the personal and financial information of 10 million patients was breached.

Systema Software (healthcare): Breach occurred on September 21 and the medical records of 1.5 million patients was breached.

Experian (business service): Breach occurred on October 1 and the personal information of 15 million records was breached.

Scottrade (commercial): Breach occurred on October 1 and the personal information of 4.6 million records was breached.

Vtech (IT): Breach occurred November 30 and the email addresses of 6.4 million people were breached.

Secretary of State Brian Kemps (government): Breach occurred on November 18 and the personal information of 6 million people was breached.