People search Marquis Software Solutions data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 2 Marquis Software Solutions-linked incidents, with headline counts up to 672K+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Marquis Software Solutions breach history matters
Marquis Software Solutions operates in Finance (United States). Across indexed rows, recurring themes include ransomware and extortion. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2026 — California AG data breach notification
Cataloged incident. Marquis Software Solutions appears on the California Attorney General data breach notification list (reported 03/16/2026). Record counts and exposed data types are often not published in the initial AG listing; consult the linked sample notification on the AG site when available. Exposed categories include Not specified in AG list export; see organization sample notification. No attested victim count is published for this row yet. See the marquis-software-solutions-2026-ca-20260 and canonical BreachHistory entry.
2025 — ransomware; 672K people across 74 banks (SonicWall vector)
Cataloged incident. Marquis Software Solutions, a Texas fintech serving more than 700 U.S. banks and credit unions, disclosed that a ransomware gang stole data belonging to 672,075 individuals in an August 14, 2025 attack that disrupted operations at 74 client institutions. Notification letters filed with state attorneys general in March 2026 confirmed names, dates of birth, addresses, phone numbers, Social Security numbers, taxpayer IDs, and financial account information (without security/access codes) were taken after attackers comp Exposed categories include Names, DOB, addresses, phones, SSNs, TINs, and financial account data without access codes. BreachHistory cites approximately 672K+ affected records in this row. See the marquis-software-solutions-ransomware202 and canonical BreachHistory entry.
Patterns and analysis
- Ransomware and extortion — appears across multiple Marquis Software Solutions 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 Marquis Software Solutions company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/marquis-software-solutions · Latest: marquis-software-solutions-2026-ca-20260316.
Sources: BreachHistory catalog (2 rows for Marquis Software Solutions), company and regulator disclosures cited in individual breach records.