MainStreet Bancshares discloses data security incident via third-party vendor affecting 4.65% of customers

MainStreet Bancshares, Inc.

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.

item 8.01

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