https://www.bloomberg.com/graphics/2014-data-breaches/
A Quick Guide to the Worst Corporate Hack Attacks
By Keith Collins
| Updated March 18, 2015
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The recent attack on Premera Blue Cross is the latest in a long series of data breaches at corporations in the U.S. by hackers seeking customer credit card numbers, user passwords, internal documents and emails. Here’s a tally of what hackers have made off with, and how the stock market reacted—or didn't—in the immediate aftermath.
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U.S. STOCK PRICE
RECORDS STOLEN
TYPE
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Premera Blue Cross
Announced: 03/18/2015
The company, which discovered the breach in January, says hackers may have accessed Social Security numbers, bank accounts and medical information.
Private company, N/A
11M
Credit card numbers
Bank accounts
Social Security numbers
Proprietary information
Employee details
Email addresses
Physical addresses
Login credentials
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Anthem
Announced: 02/05/2015
Sources familiar with the investigation tell Bloomberg News that the details of this attack include “fingerprints” of a nation-state, and that China is the main suspect.
02/20
02/12
02/05
01/29
01/22
01/14
01/07
130
135
140
←Announcement
Stock fell 1.1%
80M
Credit card numbers
Bank accounts
Social Security numbers
Proprietary information
Employee details
Email addresses
Physical addresses
Login credentials
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Sony
Announced: 11/25/2014
Hackers broke into its network and exposed employment and salary records, documents and embarrassing private emails between Hollywood executives.
12/11
12/04
11/26
11/19
11/12
11/05
10/29
18
19
20
21
22
Stock fell 1.1%
47,000
Credit card numbers
Bank accounts
Social Security numbers
Proprietary information
Employee details
Email addresses
Physical addresses
Login credentials
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Home Depot
Announced: 09/02/2014
The company said 56 million payment cards had been stolen, and later disclosed 53 million e-mail addresses had also been pilfered.
09/17
09/10
09/03
08/26
08/19
08/12
08/05
85
90
Stock fell 2.4%
109M
Credit card numbers
Bank accounts
Social Security numbers
Proprietary information
Employee details
Email addresses
Physical addresses
Login credentials
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JPMorgan
Announced: 08/27/2014
The biggest U.S. bank said a data breach affected 76 million households and 7 million small businesses.
09/12
09/05
08/28
08/21
08/14
08/07
07/31
56
57
58
59
60
Stock fell 0.7%
83M
Credit card numbers
Bank accounts
Social Security numbers
Proprietary information
Employee details
Email addresses
Physical addresses
Login credentials
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EBay
Announced: 05/21/2014
In a massive attack, hackers took customers’ personal information, affecting up to 145 million active users.
06/05
05/29
05/21
05/14
05/07
04/30
04/23
51
52
53
54
Stock fell 0.7%
145M
Credit card numbers
Bank accounts
Social Security numbers
Proprietary information
Employee details
Email addresses
Physical addresses
Login credentials
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Target
Announced: 12/13/2013
Though announced at the end of 2013, the effects of this breach carried into 2014. Target said its U.S. sales were "meaningfully weaker" after the data theft was disclosed.
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