Was Thema Foundries hit by ransomware?

Thema Foundries was listed by the Qilin ransomware operation (France), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Qilin ransomware group?

Qilin is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Thema Foundries breach?

Qilin published data attributed to Thema Foundries. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Thema Foundries

Claimed by Qilin · listed 3 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedSep 16, 2026
Data leakeddate unknown

At a glance

Group: Qilin
Status: Data leaked
Country: France
Sector: Manufacturing
Listed on leak site: Sep 16, 2026

About the victim

AI dossier — public-source company profile

Thema Foundries is Europe's first dedicated backend photonics foundry, specializing in production-scale on-chip laser integration and testing for silicon photonics applications. The company focuses on solving integration challenges in AI data centers by enabling optical interconnects to replace copper connections in high-speed GPU communications.

Industry: Semiconductor Manufacturing - Photonics

Attack summary

Severity: medium — Disclosed status shows 'data_published' but no leak post content, proof files, or data inventory details are available. The victim is a high-value semiconductor/photonics manufacturer with likely access to sensitive R&D and technical IP, but without evidence of what was actually compromised or published, severity cannot be elevated to 'high' or 'critical'.

The qilin ransomware group claims to have attacked Thema Foundries. The leak post content was not provided (marked 'N/A'), so specific details about whether data was exfiltrated, encrypted, or what information may be at stake cannot be determined from the available disclosure.

medium

What the group claims

N/A

Sources

Source

Indexed 3 hours ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Qilin

Qilin is a ransomware group that emerged in October 2022, operating with primarily financial motivations through targeted attacks against organizations across multiple sectors. The group appears to operate independently with limited public information available regarding their specific country of origin or affiliations to other ransomware families. Qilin employs double extortion tactics, typically exfiltrating sensitive data before deploying their encryption payload, though specific details about their initial access vectors and technical tools remain less documented in public security research. The group has demonstrated a broad targeting approach, with their 1645 known victims spanning multiple countries including the United States, France, Canada, United Kingdom, and Germany, with particular focus on manufacturing, technology, healthcare, and business services sectors. Based on available intelligence reporting, Qilin remains an active threat as of recent assessments, continuing their ransomware operations without significant reported law enforcement disruption. The group has been linked to 2,313 public disclosures across our corpus. First observed on a leak site on October 8, 2022; most recent post September 16, 2026. The operation is currently active.

Timeline of this disclosure

September 16, 2026Thema Foundries listed by Qilin on the group's public leak site

Other recent disclosures by Qilin

Qilin has been linked to 2,313 public victims on Darkfield. A sample of the most recent:

See the full Qilin dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,696 disclosures indexed across all operators we track. Geographically, Thema Foundries is reported in France, a country with 242 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Qilin means Thema Foundries appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CERT-FR (France), as required for your jurisdiction.
Monitor for the data appearing on Qilin's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.