Marble Harbor Investment Counsel, LLC Data Breach Notice (Massachusetts Attorney General)

The filing from Marble Harbor Investment Counsel, LLC reports that financial account numbers belonging to 67 Massachusetts residents were exposed. If you received a letter from the firm, this is the specific information that was included in the incident disclosed on May 21, 2026.

Financial account numbers do not expire. Unlike a credit card that can be canceled and reissued, these identifiers can remain valuable to fraudsters for years. They can be used to attempt account takeover, initiate unauthorized wire transfers, or support synthetic identity fraud when combined with other details obtained elsewhere. This exposure creates a long-term risk rather than a temporary one.

Why financial account numbers matter more than many people assume

Even without passwords or Social Security numbers listed in the filing, account numbers alone can accelerate targeted fraud. Criminals frequently use them to impersonate legitimate customers when calling the firm or linked financial institutions. They may also combine them with publicly available information or data from other breaches to build convincing profiles.

The record does not list any permanent government identifiers such as Social Security numbers, driver’s license numbers, or dates of birth. No passwords were exposed. This is genuinely good news. It means the breach does not directly compromise your ability to log into accounts or open new credit in your name using information from this specific incident.

What the limited scope of the filing tells you

Only financial account numbers appear in the categories named by the Massachusetts filing. The organisation was not required to report any other data types for these 67 individuals. This narrow exposure reduces the immediate identity-theft potential compared with breaches that include Social Security numbers or multiple biographical details.

However, the absence of broader data does not eliminate all risk. Financial account numbers can still support ongoing fraud attempts against accounts you hold with Marble Harbor or related institutions. The filing does not state whether the data was merely accessed or actually exfiltrated, nor does it disclose the root cause.

How to determine if this incident affects you

The organisation is required to notify affected individuals directly, usually by mail. If you have not received a letter, it is likely that your records were not part of the group of 67. Anyone who has moved since the incident should contact Marble Harbor Investment Counsel directly to confirm whether their information was included.

The lasting nature of this exposure

Because financial account numbers cannot be changed like a password or a compromised card, vigilance becomes an ongoing practice rather than a one-time response. The risk does not automatically diminish after 90 days or a year. Monitoring remains relevant for as long as you maintain relationships with the firm or any linked financial entities.

This incident involves a relatively small number of people. The filing does not suggest widespread exposure across the firm’s entire client base. That fact may limit how widely the stolen data circulates compared with breaches affecting thousands or tens of thousands.

Practical steps that address this specific exposure

• Contact Marble Harbor Investment Counsel immediately and ask them to confirm the status of your accounts and add heightened security measures such as verbal password verification or transaction alerts.
• Review all statements and transaction histories for any accounts linked to Marble Harbor for unusual activity, even small test charges that fraudsters sometimes use to validate numbers.
• Place a fraud alert with the three major credit bureaus to make it harder for someone to open new accounts using details derived from this breach.
• Monitor your bank and investment accounts more frequently than usual, at least weekly for the next several months, using official apps or websites rather than links in email.
• Be extremely cautious with unsolicited calls or emails claiming to be from Marble Harbor or your linked financial institutions; never provide account details in response to inbound contact.

The letter you may have received is the most reliable indicator of whether you are personally affected. The filing itself contains only the information required by Massachusetts law and does not guarantee that every possible risk has been disclosed. Focus your attention on the accounts actually tied to these financial account numbers. That remains the area you can still control.