People search BMO Financial Group data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 2 BMO Financial Group-linked incidents, with headline counts up to 90 in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why BMO Financial Group breach history matters
BMO Financial Group operates in Finance (Canada). Across indexed rows, recurring themes include mixed intrusion and disclosure events. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2018 — — 90k with Simplii
Cataloged incident. Poor security. 90k with Simplii. Exposed categories include Names, emails, addresses, and other PII. BreachHistory cites approximately 900 affected records in this row. See the bmo2018 and canonical BreachHistory entry.
2012 — — BMO Financial Group: The laptop of an employee who works for a BMO…
Cataloged incident. The laptop of an employee who works for a BMO Harris Bank vendor was stolen. It contained customer names, addresses, and dates of birth. BMO learned of the breach on June 20. Exposed categories include Personal information. No attested victim count is published for this row yet. See the bmo2012 and canonical BreachHistory entry.
Patterns and analysis
- Mixed intrusion and disclosure events — appears across multiple BMO Financial Group catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Bookmark the BMO Financial Group company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/bmo · Latest: bmo2018.
Sources: BreachHistory catalog (2 rows for BMO Financial Group), company and regulator disclosures cited in individual breach records.