Attorneys at Almeida Law Group are investigating whether a class action lawsuit can be filed on behalf of individuals affected by a possible Onsemi data breach. According to dark web monitoring sources, a hacker group calling itself qilin claimed responsibility for a cyberattack on Onsemi in a post first observed in October 2026, alleging it had gained access to internal company systems. As of this writing, Onsemi has not issued a public confirmation of the incident, and the exact scope of any exposed data remains unknown. If you believe you were affected, contact Almeida Law Group.
About Onsemi
Onsemi (ON Semiconductor Corporation) is an American semiconductor company headquartered in Scottsdale, Arizona, that designs, manufactures, and supplies power and sensing semiconductor products. Founded in 1999 as a spin-off of Motorola’s semiconductor components group, it is publicly traded on NASDAQ under the ticker ON and employs approximately 22,600 people across operations in North America, Europe, and Asia-Pacific. The company serves markets including automotive, industrial, communications, computing, consumer, medical, and military and aerospace sectors.
What Happened?
On October 5th, 2026, the Qilin ransomware group listed Onsemi as a claimed victim on its dark-web leak site. The claim was first observed by Ransomware.live at 13:15 UTC on that date. No breach date, data volume, or description of the specific data types involved was included in the posting. Onsemi has not issued a public statement, SEC filing, or any other official confirmation of the incident. No independent corroborating news coverage of a breach at Onsemi was found. All assertions about this incident should be treated as unverified attacker-side allegations unless and until Onsemi or a regulatory authority confirms them.
Qilin, also known as Agenda, is a Russian-speaking ransomware-as-a-service group active since at least 2022. It operates a double-extortion model, in which attackers claim to both encrypt victim systems and exfiltrate data. Qilin has been among the most active ransomware groups in 2026, reportedly accounting for 15% of all ransomware attacks tracked in August 2026. Notably, Qilin also claimed another semiconductor company, INOVA Semiconductors GmbH, as a victim just days earlier on October 2nd, 2026, which researchers have noted as a possible sign of sector-focused targeting. No arrests, indictments, or sanctions against Qilin had been reported as of August 2026.
Key Facts at a Glance
- Company or Organization: Onsemi (ON Semiconductor Corporation)
- Industry: Semiconductors / Electronics Manufacturing
- Location: Scottsdale, Arizona, United States
- Incident type: Ransomware claim (dark-web leak-site allegation; unverified)
- Source: Ransomware.live – Victim: Onsemi; Wikipedia – Qilin (cybercrime group); Industrial Cyber – Ransomware activity hits 2026 high, Qilin dominates
What Should You Do?
If you are concerned that your personal information may have been exposed, consider placing a fraud alert or credit freeze with the three major credit bureaus — Equifax, Experian, and TransUnion — to make it harder for someone to open new accounts in your name. You can request free copies of your credit reports at AnnualCreditReport.com to review them for unfamiliar accounts or activity. Monitor your existing financial accounts closely for unauthorized transactions. If you become a victim of identity theft or fraud, the Federal Trade Commission’s IdentityTheft.gov provides step-by-step guidance on what to do next. Because the types of data potentially involved in this claim have not been specified, it is worth staying alert for any suspicious contact, phishing attempts, or unusual account activity in the coming weeks and months.
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.
