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Updated about 1 month ago

Hamilton Construction Company Data Breach

▼ Key takeaways

•Reports suggest a potential breach involving Hamilton Construction Company.
•Discovered on June 19, 2025.
•Affects individuals in: Montana.
•Confirmation level: Confirmed by regulators.

Breach confirmed

The Hamilton Construction Company breach is confirmed. If you may be affected, add your details below and we will take it from there.

Detailed summary

Hamilton Construction Company experienced a data breach that started on June 19, 2025, and concluded on October 7, 2025. The company reported this incident to the Montana Department of Justice on November 12, 2025, and a data-notification-letter was issued to affected individuals on the same day. This breach is distinct from other incidents involving entities named "Hamilton."

This incident affected 21 individuals residing in Montana. The specific types of data exposed, and whether sensitive information such as SSN, medical, or financial data was involved, have not been explicitly detailed in the publicly available search results. This information would typically be found in the official data-notification-letter.

Details surrounding data breaches can emerge over time as investigations progress and companies provide more information. Official notices to affected individuals may also be delayed for various reasons.

Company Response Timeline

Response Grade

Notified consumers within 31–60 days

Breach Occurred

Jun 19, 2025

Company Discovered

Oct 7, 2025

Regulator Notified

Nov 12, 2025

Consumers Notified

Nov 12, 2025

110 days to discover

36 days to notify consumers

Breach Verification Status

Reports Only

Complete

Initial dark web reports of potential breach

Company Confirmed

Complete

Company has acknowledged the breach

Regulator Confirmed

Current

Confirmed by regulatory authorities

Note: Breach verification can take time. Information may evolve as more details become available from companies and regulators.

Case Status:

Monitoring

We're monitoring this situation for developments.

Were You Affected By This Breach?

If you are a customer or have received a data breach notification, you may submit your information as part of our ongoing investigation. Submitting your information is free and does not obligate you.

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Check Your Risk Level

Answer a few questions to understand how this breach might affect you

Do you use Hamilton Construction Company?

Yes

What state are you in?

What should I do?

Change your passwords

Update passwords for the affected service and any accounts using the same password

Enable two-factor authentication

Add an extra layer of security to your accounts

Monitor your accounts

Watch for suspicious activity on your financial and online accounts

Watch for phishing attempts

Be cautious of emails or messages claiming to be from the affected company

Consider a credit freeze

Prevent unauthorized access to your credit report

Scan your email for other exposures

Check whether this address shows up in other known breaches. Free, no account.

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