Whitespace, the UK sovereign AI company, and Mattermost, the secure collaboration platform trusted by defence, government and mission-critical organisations worldwide, today announced a partnership focused on advancing operational AI, secure collaboration and institutional learning across defence and national security environments.
The partnership brings together Whitespace's Collective sovereign AI operating system and Mattermost's mission-critical collaboration platform to support the development of integrated operational capabilities that help defence organisations connect information, decision-making, operational action and organisational learning within secure operational environments.
As defence organisations face increasingly complex operating environments, the challenge is no longer simply accessing information. The challenge is enabling people, systems and organisations to coordinate effectively, act with confidence and continuously learn from operational experience.
The partnership builds on recent joint activity showcased at Eurosatory 2026, where Whitespace and Mattermost demonstrated an operational AI capability designed to support defence teams operating across connected, disconnected and coalition environments.
Both organisations were members of the original Oracle Defence Ecosystem launch cohort, where a shared focus on operational deployment and mission-critical technology first brought the teams together. That relationship has since evolved into a formal partnership focused on advancing operational AI and secure collaboration capabilities for defence.
The capability brought together AI-enabled operational workflows, decision support, secure collaboration and operational learning within a unified operational environment, demonstrating how organisations can reduce the time between information, understanding, decision and operational impact.
Bringing Operational Collaboration and Sovereign AI Together
Mattermost provides secure, deployment-agnostic collaboration capabilities trusted by defence and government organisations around the world. Designed for mission-critical environments, the platform enables teams to communicate, coordinate and execute operational workflows across complex and often contested environments.
Whitespace's Collective platform is a sovereign AI operating system that enables organisations to deploy trusted AI across cloud, edge, on-premise and air-gapped environments. Collective connects governed data, organisational context, AI reasoning and operational workflows to support decision-making, operational learning and continuous improvement.
Together, the two organisations are exploring how secure collaboration, AI-powered operational workflows and institutional learning can be brought together into a more unified operational environment. The focus is on helping defence and national security organisations accelerate operational tempo, strengthen organisational learning and integrate AI more effectively into mission-critical workflows.
Supporting Defence's Next Phase of AI Adoption
While many defence organisations are actively exploring artificial intelligence, operational success increasingly depends on how AI integrates with existing people, processes and mission workflows.
The partnership between Whitespace and Mattermost reflects a shared focus on operational deployment rather than experimentation alone, enabling organisations to move beyond isolated tools towards connected operational environments that support mission execution, coordination and learning.
By combining secure collaboration with sovereign AI capabilities, the two organisations aim to help defence teams operate more effectively, learn faster and maintain operational advantage in increasingly complex environments.
Andrew Webber, Chief Partnerships Officer at Whitespace - "The future of defence technology will be built through ecosystems, not individual platforms. By bringing together Mattermost's mission-critical collaboration capabilities and Collective, our sovereign AI operating system, we're exploring how organisations can better connect people, information, workflows and learning within a trusted operational environment.
Our focus is simple: helping defence organisations move beyond isolated tools towards operational AI capabilities that support stronger coordination, faster learning and more effective operations."
"Defence organisations need more than standalone AI tools—they need operational environments where people, information, and technology work together seamlessly. By combining Mattermost's secure collaboration capabilities with Whitespace's sovereign AI platform, we're helping create an ecosystem that supports better coordination, faster decision-making, and continuous operational learning." - Jason Blais, VP Product & NATO Alliances at Mattermost
The partnership represents the first step in a broader programme of collaboration focused on operational AI, secure mission workflows and coalition interoperability. Further demonstrations, capability announcements and ecosystem developments will be shared throughout 2026.
About Mattermost
Mattermost is the leading sovereign collaboration and AI automation platform for national security and critical infrastructure enterprises. We put mission-critical work in motion with secure collaboration and workflow built for complex environments. Trusted by governments, allied militaries, and enterprises around the world, our platform runs on-premises and in private clouds - delivering secure messaging, file sharing, systems integration, workflow automation, audio/screenshare, project management and human-machine teaming with complete data and operational control. For more information, visit www.mattermost.com.
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