Combined Space Technology Ltd

What Combined Space Technology Ltd does

Combined Space Technology Ltd, trading as World Mobile Stratospheric, is a UK private company developing stratospheric 5G telecommunications infrastructure. The company was formed in 2025 as a joint venture that combines the stratospheric platform technology originating from Stratospheric Platforms (founded 2014 with a £75m R&D programme) with the decentralised network model of World Mobile Group. It is headquartered in Pampisford, Cambridge, and operates a direct enterprise field-sales motion targeting governments, defence agencies, telecom carriers and large industrial operators. Pricing is quote-based and not publicly disclosed, with deployment enquiries handled via a dedicated team that responds within two working days.

The core product is StratoMast, a hydrogen-powered, fixed-wing uncrewed aerial vehicle designed to cruise at 60,000 ft and deliver direct-to-device 4G/5G connectivity over a 15,000 km² footprint with sub-millisecond latency, 7-day mission endurance, and water vapour as the only emission. StratoMast carries a 32-tile phased-array antenna beneath an RF-transparent composite skin, using AI-driven beam-forming to steer multiple simultaneous 4G/5G beams while remaining 3GPP-compliant and neutral-host with respect to carrier core networks. A secondary product, SkyMast, is a crewed Britten-Norman Islander aircraft at 22,000 ft designed for rapid disaster-response 4G/5G deployment. The platform also integrates AirNodes (radio access) and EarthNodes (validation/settlement) and can connect to the World Mobile Chain blockchain settlement layer. Revenue streams are managed-infrastructure services: StratoMast deployment and operations, SkyMast rapid-response, and neutral-host 5G access-node services to mobile operators.

Revenue-generating commercial deployments have not yet begun; the company's activity to date is technology validation and demonstration. Flagship engagements include the 2020 4G integration with Deutsche Telekom on a live German network, the 2023 90 Mbps direct-to-device 5G demonstration to BT Group and the UK Ministry of Defence under the Innovate UK HAIC programme, and the planned 2026 5G NR flight trial at BT's Adastral Park. WRC-23/ITU spectrum clearance has been secured, and ISO 9001 / AS9100 certifications are held. First SkyMast deployment is planned for 2027, StratoMast test flights for 2028, and first commercial stratospheric deployments for 2028-2029. Aerospace integration partners include Scaled Composites (Northrop Grumman), GKN Aerospace, Britten-Norman, Marshall Aerospace and Cambridge Consultants, with KAUST contributing free-space-optical backhaul research.

Name

Combined Space Technology Ltd

Legal name

Combined Space Technology Ltd

Website

https://wmstratospheric.com

Company type

Private

Operating status

Operating

Short description

Combined Space Technology Ltd (World Mobile Stratospheric) develops hydrogen-powered fixed-wing UAVs and crewed aircraft that deliver direct-to-device 4G/5G from the stratosphere, serving governments, defence agencies, telecom carriers, and industrial operators with managed neutral-host coverage infrastructure.

Ownership category

akta.pro rank

Product category

Stratospheric Telecommunications Infrastructure

NAICS

Satellite Telecommunications (51741), Computer Systems Design and Related Services (54151), Guided Missile and Space Vehicle Manufacturing (336414)

SIC

Computer Communications Equipment (3576), Services-Computer Integrated Systems Design (7373), Guided Missiles & Space Vehicles & Parts (3760)

akta.pro primary industry

UAS Communications, Datalinks, SATCOM & Remote Control Systems (IMABAIAJ)

akta.pro secondary industries

Military Unmanned Aircraft Systems (UAS) & Autonomous Aerial Platforms (IMABAMAC), Enterprise Satellite Connectivity & Managed Services (VSAT, SD-WAN over Satcom) (HDAIAJAB), Satellite Network Operations & Capacity Services (NOC, Capacity Leasing, Managed Payload Services) (HDAIAJAI)

Keywords

• Stratospheric connectivity
• Direct-to-device 5G
• Hydrogen UAV
• Neutral-host network
• Phased-array antenna

Headquarters

HQ city

Cambridge

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Technology or R&D, Personnel, Operations, Infrastructure, Supply Chain

Revenue model

1. StratoMast Infrastructure Services: Deploying sovereign 5G coverage from 60,000 ft as managed infrastructure services to governments, telecom carriers, and enterprises. Revenue derived from infrastructure deployment, platform services, and ongoing operational support.
2. SkyMast Rapid Response: Crewed Britten-Norman Islander deployment for disaster resilience and emergency service networks. Rapid deployment service providing immediate 4G/5G coverage where ground infrastructure has failed.
3. Network Access Node Services: Neutral-host 5G access as a service to mobile operators. Operators ride the 3GPP neutral-host layer to reach standard handsets without building their own stratospheric access network.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Combined Space Technology Ltd, trading as World Mobile Stratospheric, develops and deploys hydrogen-fueled fixed-wing UAVs (StratoMast) operating at 60,000 ft to deliver direct-to-device 4G/5G coverage across 15,000 km² per platform via a 32-tile phased-array antenna, alongside a crewed Britten-Norman Islander aircraft (SkyMast) for rapid disaster-response connectivity at 22,000 ft. The platform is offered as 3GPP-compliant neutral-host infrastructure integrating with existing carrier core networks, sold as managed infrastructure services to governments, telecom carriers, and industrial operators.

Product overview

Combined Space Technology Ltd (trading as World Mobile Stratospheric) operates a platform architecture consisting of stratospheric 5G infrastructure products. The flagship StratoMast is a hydrogen-powered UAV providing direct-to-device 5G at 60,000 ft with 15,000 km² coverage per platform, while SkyMast is a crewed Islander for rapid disaster response at 22,000 ft. Both products integrate with the AirNodes (radio access layer) and EarthNodes (validation/settlement) stack, and can connect to World Mobile Chain for blockchain-based settlement. The platform delivers sovereign, zero-emission 5G connectivity via 3GPP-compliant neutral-host infrastructure.

Differentiator

Problem solved

Functional benefit

Products and services

• StratoMast Hydrogen-powered, fixed-wing uncrewed aerial vehicle operating at 60,000 ft, providing direct-to-device 5G coverage across 15,000 km² per platform with sub-millisecond latency and 7-day mission endurance. Carries a 32-tile phased-array antenna under RF-transparent composite skin and integrates as a 3GPP-compliant neutral-host access node with existing carrier cores.
• SkyMast Crewed Britten-Norman Islander aircraft carrying a phased-array antenna for rapid disaster response, delivering direct 4G/5G connectivity to standard handsets at 22,000 ft within hours of deployment from any regional airport. Rolls-Royce 250 engines on Jet A-1 fuel.

Quantifiable outcome

• 15,000 km² coverage per platform vs ~30 km² for ground towers (500x improvement)
• +4 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature5 records

Partnerships

Twelve partnerships are on record, tiered flagship, core and minor.

• BT GroupflagshipStrategic or Co-development Partner · 1 January 20265G NR flight trial expected at BT's Adastral Park facility in 2026. 90 Mbps direct-to-device demonstrated to BT and UK MoD in 2023 via Innovate UK HAIC programme.
• World Mobile GroupcoreStrategic or Co-development Partner · 1 January 2025World Mobile Stratospheric joint venture formed with World Mobile Group, building on their decentralized network model. AirNodes provide radio access layer, EarthNodes validate and settle. StratoMast slots into the same mesh architecture. WMS leverages World Mobile's existing carrier relationships and network model.
• UK Ministry of DefenceflagshipStrategic or Co-development Partner · 1 January 2023Aether programme participant. DSTL live demonstration conducted 2023. Joint 5G direct-to-device trials with BT as part of Innovate UK HAIC programme.
• Deutsche TelekomflagshipStrategic or Co-development Partner · 1 January 2020World's first stratospheric 4G integration on a live network (Germany, 2020). Pioneering deployment validating stratospheric direct-to-device connectivity with major European carrier.
• Scaled Composites (Northrop Grumman)coreTechnology or IntegrationAirframe engineering partner. Northrop Grumman company providing specialized composite airframe design and manufacturing expertise for stratospheric UAV platform.
• GKN AerospacecoreTechnology or IntegrationManufacturing and design-for-manufacture partner. Provides aerospace manufacturing capabilities for the StratoMast platform.
• Cambridge ConsultantscoreTechnology or IntegrationArray design and validation partner. Developed four-tile test cell with anechoic chamber validation for the phased-array antenna system.
• Britten-NormancoreTechnology or IntegrationSkyMast platform provider. BN2T-4S Islander aircraft carries phased-array antenna to 22,000 ft for rapid disaster response deployment. Rolls Royce 250 engines, Jet A-1 fuel.
• McKinsey & CompanyminorImplementation/ SI/ Consulting PartnerStrategy consulting. Listed among validation tier partners in footer.
• PA ConsultingminorImplementation/ SI/ Consulting PartnerManagement and technology consulting. Listed among validation tier partners in footer.
• DSTL (Defence Science and Technology Laboratory)coreStrategic or Co-development PartnerUK defence research partner. Conducted live demonstrations as part of Aether programme (2023). Technical validation of stratospheric 5G capabilities.
• AriaminorImplementation/ SI/ Consulting PartnerInnovation agency. Listed among validation tier partners in footer.

Scale indicators7 records

Recent moves8 records

Expansion highlights7 records

Direct peers

• BAE Systems (PHASA-35): BAE Systems' PHASA-35 is a solar-electric stratospheric UAV targeting persistent communications and surveillance at similar altitudes. Direct competitor in the high-altitude pseudo-satellite segment with comparable endurance ambitions and defence customer overlap.
• Airbus Zephyr: Airbus's Zephyr is a solar-powered stratospheric HAPS platform offering direct-to-device connectivity and Earth observation. Most directly comparable stratospheric infrastructure competitor, with overlapping telecom operator and government customer profiles.
• SoftBank HAPSMobile: HAPSMobile (SoftBank/AeroVironment) developed the Sunglider stratospheric UAV for telecom backhaul and direct-to-device. Competes in the same HAPS-telecom category with similar target customers in remote coverage and disaster response.
• AST SpaceMobile: AST SpaceMobile is building a LEO satellite constellation for direct-to-device 5G/4G to standard handsets. Closest LEO competitor to WMS in the direct-to-device connectivity category, targeting the same MNOs and use cases from orbit rather than the stratosphere.
• SpaceX Starlink Direct to Cell: Starlink Direct to Cell provides satellite-based direct-to-handset connectivity via T-Mobile and other carrier partners. Competes with WMS on remote and offshore coverage use cases, though at materially higher latency than StratoMast.
• Loon (Alphabet): Alphabet's Loon operated stratospheric balloons delivering 4G/LTE coverage to remote regions before winding down in 2021. Closest historical peer in business model — stratospheric telecom infrastructure as a service — providing lessons on unit economics and operational durability.

Broad incumbents

• Thales Alenia Space: Thales Alenia Space is a major space and aerospace prime with adjacent HAPS and stratospheric infrastructure programmes. Comparable as a large incumbent operating across telecom satellites, defence space, and high-altitude platforms serving overlapping government and operator customers.

Others

• Scaled Composites (Northrop Grumman): Scaled Composites is WMS's airframe engineering partner and a Northrop Grumman subsidiary building experimental and composite airframes including high-altitude platforms. Comparable as a strategic ecosystem enabler rather than a competitor in telecom services.
• Deutsche Telekom: Deutsche Telekom is both a flagship WMS trial customer (2020 4G integration) and a major European MNO pursuing alternative coverage technologies. Comparable as an ecosystem participant and potential anchor enterprise customer rather than a competitor.
• World Mobile Group: World Mobile Group is WMS's joint venture partner providing decentralised AirNode/EarthNode mesh and emerging-market carrier distribution. Comparable as a strategic partner and customer-channel enabler for the StratoMast platform rather than a competing infrastructure provider.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks4 records

Key highlights7 records

Customer concentration

• Xx.com/WorldMobileTeam

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Combined Space Technology Ltd