Main Street Bank Data Breach Lawsuit Investigation
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Dapeer Law, P.A., a top-rated class action law firm, is investigating the Main Street Bank data breach. If you received notice that your information was exposed during this breach, you may be entitled to compensation. It's free to join our investigation to see if we can help you recover.

Main Street Bank Data Breach Lawsuit Investigation

On September 26, 2025, Main Street Bank alerted the Massachusetts Attorney General to a payment-card data breach that compromised customer information collected between January 1 and July 31, 2025. The notice confirms that two customers’ card data—including cardholder names, numbers and expiration dates—may have been exposed.

If you received a breach letter from Main Street Bank, you could be entitled to financial compensation and complimentary identity-protection services. Contact us today for a free, no-obligation case evaluation.

Download Official Breach Notice (PDF)

Key Facts About the Main Street Bank Breach

  • Breach window: January 1 – July 31, 2025
  • Consumer notice mailed: September 8, 2025
  • Regulatory filing date: September 26, 2025 (Massachusetts)
  • Total individuals affected: 2 (all in Massachusetts)
  • Data elements at risk: cardholder names, card numbers and expiration dates
  • Social Security numbers and Main Street Bank account numbers were not involved, according to the bank

How Did the Incident Happen?

Main Street Bank attributes the event to a “suspected data compromise of a merchant’s payment card environment.” The bank states it has no evidence that unauthorized parties accessed customer Social Security numbers or internal account numbers, but card data processed during the period in question may have been exposed.

What Is Main Street Bank Doing?

The bank indicates it already maintains systems that help shield customers from fraud. In response to the incident, Main Street Bank is offering:

  • Instant-issue replacement debit cards at any branch
  • Mailed replacement debit cards upon request (estimated arrival in 10–12 business days)

Recommended Steps for Affected Customers

According to the notice, Main Street Bank advises customers to:

  • Closely monitor account statements for the next 12–24 months
  • Use Main Street Bank Internet Banking to review transactions in real time
  • Immediately report any unauthorized charges to the bank
  • Obtain and review credit reports from Equifax, Experian and TransUnion via AnnualCreditReport.com
  • Consider placing a free 90-day fraud alert on your credit file

Timeline of Events

  • January 1, 2025 – Suspected compromise begins
  • July 31, 2025 – Suspected compromise ends
  • September 8, 2025 – Consumer notification letters mailed
  • September 26, 2025 – Breach reported to MA Attorney General
  • October 1, 2025 – Last update to regulatory filing

Company Overview

Main Street Bank is a community bank headquartered in Marlborough, Massachusetts, serving personal, business and nonprofit customers since 1860.

Frequently Asked Questions

Was my information included in the Main Street Bank data breach?

If you received a mailed notice dated September 8, 2025, your card data may have been compromised. The bank reported that two customers were affected.

What data was exposed in the Main Street Bank breach?

The exposed data potentially includes cardholder names, debit card numbers and expiration dates used between January 1 and July 31, 2025.

Is Main Street Bank offering free credit monitoring?

The notice does not reference complimentary credit-monitoring services. Instead, the bank recommends vigilant account review and offers instant or mailed replacement debit cards.

Can I sue Main Street Bank for the breach?

Data-breach victims may be entitled to compensation for fraudulent charges, time spent remedying identity theft and other losses. Contact us for a free legal consultation to discuss your options.

How long should I monitor my accounts after the Main Street Bank breach?

Main Street Bank advises customers to stay alert for 12–24 months and to immediately report suspicious activity.

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