Every public data breach

Disclosed this week47On record26,367

47 disclosed this week · 26,367 on record

BMO Harris Bank

Disclosed Mar 17, 201738,391 affectedConfirmed

Official notice

What is known

People affected38,391 (as reported by the organization)
DisclosedMar 17, 2017
DiscoveredMay 17, 2017
HappenedMay 15, 2017
AttackNot stated
Data exposedNot stated
SectorFinance · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: BMO Harris Bank
Official noticejustice.oregon.gov
Oregon DOJ breach notice: BMO Harris Bank
Official noticein.gov
Indiana Attorney General 2017 data breach report: BMO Harris Bank

Notices filed

Residents of INMar 17, 2017
Indiana AG1,201 people
Residents of CAMay 31, 2017
California AGCount not stated
Residents of ORMay 31, 2017
Oregon DOJ38,391 people
Residents of INMay 31, 2017
Indiana AG1,726 people

Other breaches at BMO Harris Bank

Breach, details not statedExposed names, Social Security numbers, payment cards, passwords, phone numbers and addresses. Reported to the Indiana AG.2 affectedFinanceUSOct 23, 2015
History of this record
records_basis2026-09-25
empty to organizationby backfillSource
records2026-09-25
empty to 38391by backfillSource
disclosed2026-09-25
2017-05-31 to 2017-03-17by backfillSource
discovered2026-09-25
empty to 2017-05-17by backfillSource
Added2026-09-25
First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

Everything about BMO Harris Bank