Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Mercadien PC Certified Public Accountants

Disclosed Feb 17, 2026402,741 affectedConfirmed

Official notice

What is known

People affected402,741 (as reported by the organization)
DisclosedFeb 17, 2026
DiscoveredNov 7, 2025
HappenedSep 17, 2025
AttackNot stated
Data exposedNamesCredentials and tokensPayment cardsFinancialSocial Security numbersAddresses
SectorFinance · US
StatusConfirmed

Sources

Official noticeattorneygeneral.delaware.gov
Notice letter filed with the Delaware DOJ: Mercadien PC Certified Public Accountants
Official noticeoag.my.site.com
Texas Attorney General data security breach report BR-0004857: Mercadien PC Certified Public Accountants
Official noticein.gov
Indiana Attorney General 2026 data breach report: Mercadien PC Certified Public Accountants

Notices filed

Residents of DEFeb 17
Delaware DOJ1,062 people
Residents of INFeb 17
Indiana AG69 people
Residents of TXFeb 24
Texas AG1,323 people
Residents of TXOct 13
Texas AG5,219 people
History of this record
data_types2026-10-14
["names","credentials","payment-card","financial"] to ["names","credentials","payment-card","financial","ssn","addresses"]by dailySource
source2026-09-25
empty to https://www.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/files/DB-Year-to-Date-Report-7_2026.pdfby backfillSource
data_types2026-09-25
["names","credentials"] to ["names","credentials","payment-card","financial"]by backfillSource
Added2026-09-25
First recordedby backfillSource

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

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