HARBISONWALKER DATA BREACH: Edelson Lechtzin LLP Launches Investigation Into Exposure of Social Security Numbers and Financial Information

National class action firm Edelson Lechtzin LLP is offering free case evaluations to individuals affected by the HarbisonWalker International data breach, which may have exposed names, Social Security numbers, financial account information, and medical data

PITTSBURGH, Pa., Sept. 29, 2026 (GLOBE NEWSWIRE) -- Edelson Lechtzin LLP, a national class action law firm, is investigating data privacy claims arising from the HarbisonWalker International Inc. data breach. HarbisonWalker (HWI) is a Pittsburgh-based supplier of heat-resistant and refractory materials and the largest supplier of refractory products and services in the United States. HWI identified suspicious activity on its internal network and has begun notifying affected individuals.

Key Facts at a Glance

• Company: HarbisonWalker International Inc. — a Pittsburgh, Pennsylvania-based refractory products supplier and part of the Calderys group.
• When disclosed: HWI reported the breach to the Massachusetts Office of Consumer Affairs and Business Regulation, the Texas Attorney General, and the Vermont Attorney General starting September 22, 2026, and its notification letters are dated the same day.
• Incident details: HWI has not disclosed the specific dates of the incident or the method of attack.
• People affected: At least 56 Massachusetts residents, with additional individuals potentially affected nationwide.
• Information exposed: Names, addresses, Social Security numbers, government IDs, financial account information, and medical and health insurance information (see below).
  
  

What Happened

HWI identified suspicious activity on its internal network, secured its systems, and launched an investigation. HWI has not publicly disclosed key details, including when the incident began and how it occurred. HWI reported the breach to regulators in Massachusetts, Texas, and Vermont beginning September 22, 2026.

What Information Was Exposed

The compromised data may include names, addresses, Social Security numbers, driver’s license and government-issued IDs, financial account information, medical information, and health insurance information. Because this combination is highly sensitive, affected individuals face a lasting risk of identity theft, financial fraud, medical or insurance fraud, and targeted phishing.

Your Legal Options

Edelson Lechtzin LLP is investigating a potential class action to pursue legal remedies on behalf of individuals whose sensitive personal data may have been compromised. The firm is examining whether HWI implemented reasonable cybersecurity safeguards and whether additional measures could have prevented or reduced the breach’s impact. The firm will evaluate your rights and potential claims at no cost.

Recommended Protective Steps

• Preserve your breach notification letter and enroll in the complimentary credit monitoring before the December 31, 2026 deadline.
• Monitor your account statements, credit reports, and explanation-of-benefits statements for unauthorized activity.
• Consider placing a fraud alert or security freeze with Equifax, Experian, and TransUnion.
• Be cautious of phishing messages referencing the breach.
  
  

Contact Us for a Free Case Evaluation

Speak confidentially with a data privacy attorney today: Marc Edelson, Esq., Edelson Lechtzin LLP, 411 S. State Street, Suite N-300, Newtown, PA 18940; Phone: 844-696-7492; Email: medelson@edelson-law.com; or click HERE to request a free consultation.

About Edelson Lechtzin LLP

Edelson Lechtzin LLP is a national class action law firm with offices in Pennsylvania and California. In addition to data breach litigation, the firm handles class and collective actions involving securities and investment fraud, federal antitrust violations, ERISA employee benefit plans, wage theft, and consumer fraud.

Legal Notice: This press release may be considered Attorney Advertising in some jurisdictions.