secwatch.observer — SEC 8-K summary
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Issuer:     MainStreet Bancshares, Inc. (MNSB)
CIK:        0001693577
Form:       8-K
Filed at:   2025-05-30T23:59:59+00:00
Accession:  0001437749-25-019008
Event type: cyber
Sentiment:  negative
Materiality: 0.35
Item codes: 8.01
LLM model:  deepseek-v4-flash:cloud@v2

MainStreet Bancshares discloses data security incident via third-party vendor affecting 4.65% of customers
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- Incident discovered in March 2025 when an outside vendor to the core bank was compromised.
- Company's own IT systems were not compromised; no unauthorized transactions or fund transfers occurred.
- On April 28, 2025, vendor's compromised system was found to include PII on ~4.65% of customers.
- Regulators notified; affected customers notified on May 26, 2025, with monitoring tools provided.
- Company states incident has not materially impacted operations, financial condition, or reputation.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1693577/000143774925019008/0001437749-25-019008-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1693577/000143774925019008/main20250328_8k.htm
  HTML page:      https://secwatch.observer/filing/0001437749-25-019008

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