Mitsubishi buys Nozomi for $883m to create ‘world’s top OT security biz’
10 September 2025 
Mitsubishi Electric is buying Nozomi Networks, the US–based developer and distributor of security systems for operational technology (OT) systems, for $883m, with the aim of becoming the world’s top supplier of OT security systems. Mitsubishi plans to use secure data from customers of both organisations to create new global services that accelerate its Serendie digital platform.
Nozomi Networks, founded in 2016, is a global leader in OT security systems, with revenues of $75m in 2024, and a CAGR of 33% from 2022 to 2024. The San Francisco headquartered business employs around 315 people and operates with a gross margin of more than 70%. It has more than 1,000 customers in 75 countries. Mitsubishi has been collaborating with Nozomi since 2024 and already holds a 7% stake in the business.
Following the acquisition, Nozomi Networks will become a wholly owned subsidiary of Mitsubishi Electric, strengthening its OT security business. By combining Mitsubishi’s OT strengths with Nozomi’s cutting-edge OT security technology and diverse customer base, Mitsubishi is aiming to “fundamentally enhance its security business”.
“We are excited to welcome Nozomi to the Mitsubishi Electric family,” says Mitsubishi Electric senior vice-president and CIO, Satoshi Takeda. “Their cutting-edge OT security technology and rapid development philosophy have earned them a strong reputation. By combining Nozomi’s strengths with Mitsubishi Electric’s extensive expertise and capabilities in OT, I believe we can achieve even more.
“This acquisition will enable us to co-create valuable new services while supporting Nozomi’s commitment to innovation and customer flexibility,” he adds. “Together, we can help our customers achieve their digital transformation goals while enhancing security, efficiency, and resilience.”
“By combining Mitsubishi Electric’s century of global industrial expertise with Nozomi Networks’ innovations in data science, AI/ML and industrial cybersecurity, we have a unique opportunity to create a new generation of AI-powered solutions that will strengthen cyber and operations through power new innovations for customers across all OT/IoT use cases and industries around the world,” comments Nozomi’s co-founder and chief product officer, Andrea Carcano. “Together, we’ll make the world’s critical infrastructure safer, more resilient, and more efficient.”
Nozomi’s technologies monitor communications between devices in OT networks, and detect anomalies through data collection, visualisation and analysis.
According to Mitsubishi, Nozomi’s strengths include:
- its wireless data collection technology (which it pioneered in 2024);
- its advanced intrusion detection technology;
- a visualisation technology that covers a wide range of OT/IoT devices;
- robust revenues driven by subscriptions; and
- a diverse, global customer base in sectors including manufacturing, infrastructure and the buildings.
Nozomi’s “industry firsts” have included: a cloud-based visualisation platform (launched in 2020); AI-powered security analysis (2023); and software sensors for PLCs (2024).
Mitsubishi Electric has been developing a “one-stop OT security” offering that protects on-site equipment and systems against cyberattacks. This initiative – in response to the growing importance of OT security measures due to the IoT and digital transformation (DX) of manufacturing sites and social infrastructure – makes use of Mitsubishi’s extensive IT security expertise in various sectors (including the financial industry), and aims to promote DX across multiple industries.
Mitsubishi is planning to incorporate Nozomi technologies into its products. It started on this journey last year when it became the first company to integrate security sensors into its PLCs.
And by using data and insights obtained via Nozomi’s intrusion detection and visualisation products, it aims to create new services. This will accelerate the growth of the Serendie digital platform and its related businesses, and provide services that support customers’ digital transformation.
Mitsubishi is aiming to drive revenues from its Serendie-related businesses from around 680 billion yen ($4.6bn) in 2026, to more than 1.1 trillion ($7.5bn) by 2031. Further “significant” growth will be driven partly by more acquisitions.
The OT security market is forecast to expand from 1.9 trillion yen ($12.8bn) in 2025 to 15.1 trillion yen ($102bn) by 2035. The market is being driven by widespread digitalisation which has seen an increase in the number of cyberattacks on OT systems.
One issue that may have to be resolved is Nozomi’s existing relationships with other automation suppliers, such as its recent agreement with Schneider Electric to incorporate security sensors into RTUs (remote terminal units).
Mitsubishi expects to complete its acquisition of Nozomi this year, subject to the approval of regulatory authorities and the fulfilment of other customary conditions.
