The biggest data breaches in history
The top 3 according to 15 votes from people: Yahoo · Facebook · Marriott International. (Updated Jul 13, 2026.)
The largest leaks and hacks of personal data ever recorded, by number of accounts or records affected: from Yahoo's three billion accounts to Equifax and Capital One.
Top 22
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1
Yahoo
2013: every one of its 3 billion accounts was affected, the largest breach of a single company.
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2
Facebook
2019: data on about 533 million users, later published free on a forum.
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3
Marriott International
Its Starwood reservation system was compromised from 2014 to 2018: up to 500 million guests.
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4
National Public Data
A background-check firm whose leak exposed about 2.9 billion records, including Social Security numbers.
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5
First American Financial
2019: about 885 million property and mortgage documents left exposed online.
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6
Adult FriendFinder
2016: about 412 million accounts of the dating network.
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7
NetEase
2015: about 235 million accounts of the Chinese internet giant.
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8
Adobe
2013: about 153 million user records and source code stolen.
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9
Heartland Payment Systems
2008: about 130 million credit and debit cards compromised.
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10
JPMorgan Chase
2014: data on 76 million households and 7 million businesses.
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11
Dubsmash
2018: about 162 million accounts of the lip-sync video app.
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12
Aadhaar
2018: about 1.1 billion records from India's national ID system were exposed.
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13
Alibaba
2019: about 1.1 billion records from its Taobao shopping site were scraped.
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14
LinkedIn
2021: data on about 700 million users scraped and put up for sale.
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15
Sina Weibo
2020: about 538 million user records from the Chinese social network.
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16
MySpace
About 360 million old accounts surfaced for sale in 2016.
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17
Exactis
2018: a marketing database of about 340 million records left on an open server.
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18
Zynga
2019: about 218 million players of Words With Friends and other games.
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19
Equifax
2017: the credit bureau exposed data on about 147 million people.
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20
eBay
2014: hackers reached the data of about 145 million users.
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21
Capital One
2019: about 100 million customers affected by a cloud misconfiguration.
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22
Home Depot
2014: about 56 million payment cards stolen from its tills.
How is this ranking ordered? By people's votes: each ▲ adds a point and each ▼ takes one away. Anyone can vote and add what is missing.
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