Almeida Law Group is investigating a data breach at HarbisonWalker International, Inc. If you were affected, contact Almeida Law Group.
About HarbisonWalker International, Inc.
HarbisonWalker International (HWI) is the largest supplier of refractory products and services in the United States, with a history spanning more than 150 years. The company manufactures specialized refractory materials — including bricks, mortars, and high-temperature solutions — for industries such as steel, aluminum, and glass manufacturing. Headquartered in Moon Township, Pennsylvania (Pittsburgh area), HWI operates 25 manufacturing sites and 20 global sourcing centers in the Americas. It was acquired by Platinum Equity in 2023 and now serves as the Americas brand for Calderys. Because HWI employs a large workforce across many facilities, it collects and retains sensitive personal information about employees and potentially others, making it a target for data theft.
What Happened?
HarbisonWalker International, Inc. was listed in a Vermont Attorney General breach report summary dated September 22nd, 2026. The filing identifies Social Security Numbers as the category of personal information involved in the breach. A breach notification letter filed separately with the Massachusetts Attorney General confirms the incident and states that HWI is offering Experian identity restoration services to affected individuals, reachable at a dedicated toll-free line.
The actual date of the underlying incident and the method of attack have not been publicly disclosed. No ransomware group claim or threat-actor attribution was found in available research. Multiple law firms, including Cole & Van Note, posted notices of a HarbisonWalker International data breach investigation on September 22nd, 2026, and the breach is listed among current data breaches on ClassActionU.org. As of September 23rd, 2026, no filed class action lawsuit had been identified in public records.
Key Facts at a Glance
- Company or Organization: HarbisonWalker International, Inc.
- Industry: Refractory manufacturing (Clay Product and Refractory Manufacturing)
- Location: Moon Township, Pennsylvania (Pittsburgh area)
- Incident type: Unauthorized access to personal information including Social Security Numbers
- Date of consumer notification: September 22nd, 2026
- Identity theft protection offered: Experian identity restoration services (call 1-833-575-2853)
- Litigation status: No filed class action lawsuit identified as of September 23rd, 2026; multiple law firms investigating
- Source: Vermont Attorney General breach report summary; Massachusetts AG Breach Notification Letter (2026-1599); Wikipedia – HarbisonWalker International
What Should You Do?
If you received a notice from HarbisonWalker International, enroll in the Experian identity restoration services being offered before any stated deadline — check your notice for enrollment instructions and the toll-free number (1-833-575-2853). Beyond that, consider placing a fraud alert or credit freeze with each of the three major credit bureaus (Equifax, Experian, and TransUnion) to help prevent new accounts from being opened in your name. Monitor your existing financial accounts regularly for unfamiliar activity, and obtain your free credit reports at AnnualCreditReport.com to check for accounts or inquiries you do not recognize. If you discover signs of identity theft, report them and get a recovery plan at IdentityTheft.gov.
Your Legal Rights
If your personal information was involved in this breach, you may have legal rights depending on the facts of the incident and the law in your state. Almeida Law Group represents consumers in data breach and privacy litigation and can help you evaluate whether you may have a claim. Contact us at (708) 529-5418 or through our contact page for a free case evaluation.
