What Stour Marine does

Stour Marine Limited is an independent, Ofcom-regulated Mobile Network Operator headquartered in London, United Kingdom, founded in 2006. The company provides enterprise-grade voice, SMS, mobile data, and numbering services via proprietary SIM-based infrastructure and its own Stour mobile network, supplemented by add-on modules including SMS Relay and Text-to-Speech. Its service portfolio spans core telecom connectivity (SMS, Voice, Data, Numbering) and is positioned for global reach with particular strength in the UK market.

The company's go-to-market is enterprise B2B direct sales, with outreach via phone and a dedicated sales inbox ([email protected]). Stour operates a wholesale-style distribution model, supplying connectivity to large CPaaS and telecom incumbents including BT, Vonage, Twilio, Sinch, Neustar, and Google, while also serving adjacent verticals such as brand protection (Brand Assure) and mobile services (Devyce). Pricing is not publicly disclosed and is quote-based for enterprise engagements, consistent with a recurring subscription revenue model built around mobile service contracts.

Stour's defensibility rests on its regulatory license (Ofcom MNO accreditation held continuously since 2006) and a stack of enterprise security credentials including SOC 2 Type 2, ISO 27001, ICO registration, HM Government G-Cloud Supplier status, and GSMA Rapporteur membership. The company is privately held with no disclosed funding, acquisitions, or leadership changes, and is founder/management-controlled. Headcount is in the 11–50 range, indicating a small, niche operator focused on regulated, compliance-heavy enterprise and wholesale customers rather than the consumer mass market.

Name

Stour Marine

Legal name

Stour Marine Limited

Website

https://stourmarine.com

Company type

Private

Founded year

2006

Operating status

Operating

Headcount range

11–50 employees

Short description

Stour Marine is an independent UK Mobile Network Operator, founded in 2006 and regulated by Ofcom, providing enterprise voice, SMS, data, and numbering services to large CPaaS platforms, telecoms, and public sector buyers.

Ownership category

akta.pro rank

Product category

Mobile Telecommunications Services

SIC

Radiotelephone Communications (4812)

akta.pro primary industry

Private LTE/5G Mobile Network Operators (Campus/Industrial) (HDAIAAAE)

Keywords

• Mobile network operator services
• Enterprise SMS messaging
• Mobile voice solutions
• SIM-based data connectivity
• Telephone numbering services

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Mobile Services (Voice, SMS, Data): Revenue from providing mobile network operator services including voice calling, SMS messaging, and data access through SIM cards. Enterprise-grade solutions with scalable service levels.
2. Numbering Services: Phone numbering services as part of the telecommunications offering.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Stour Marine is an independent, Ofcom-licensed Mobile Network Operator (MNO) that sells enterprise voice, SMS, and mobile data services delivered over its own network and SIM cards. Its portfolio bundles core mobile connectivity with supporting modules such as phone numbering, SMS Relay, and Text-to-Speech for business and CPaaS customers.

Product overview

Stour Marine operates as an independent Mobile Network Operator (MNO) providing a portfolio of telecom services including SMS, Voice, Data, Numbering, SMS Relay, and Text-to-Speech solutions. The core offerings consist of global SMS messaging with worldwide connectivity, voice solutions for mobile communications, and SIM-based data services. Additional modules including Numbering, SMS Relay, and Text-to-Speech provide specialized functionality that extends the core platform for enterprise communication needs.

Differentiator

Problem solved

Functional benefit

Products and services

• SMS Global SMS messaging service with platforms and worldwide connections designed to enhance enterprise SMS delivery, available to businesses and CPaaS customers.
• Voice Cost-efficient, secure mobile voice solutions providing connectivity for businesses, delivered over Stour's mobile network.
• Data Mobile data access via Stour SIM cards over the Stour mobile network, providing global data reach with high service levels for enterprise customers.
• Numbering Phone numbering services for enterprise communication needs, providing telephone number provisioning as part of Stour's MNO offering.
• SMS Relay SMS relay service for message transmission, management, forwarding, and routing as an extension of Stour's enterprise SMS platform.
• Text-to-Speech Text-to-speech conversion service enabling voice-enabled communication solutions that extend Stour's voice and messaging capabilities for enterprise use cases.

Named customers8 records

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators1 record

Recent moves5 records

Expansion highlights3 records

Others

• Vonage (Ericsson):
• NetNumber: Provider of signaling, numbering and routing infrastructure to MNOs, MVNOs and CPaaS providers. Comparable as an ecosystem supplier in the same telecom infrastructure stack that Stour occupies.

Direct peers

• Gamma Communications: UK-based unified communications and wholesale voice/SMS/data provider serving enterprise and channel partners. Highly comparable as a horizontally-positioned UK telecom operator with a similar product mix (voice, SMS, data, numbering) and overlapping CPaaS/wholesale channel.
• JT Group (Jersey Telecom): Independent Channel Islands-based MNO operating international enterprise and wholesale telecom services. Comparable as an Ofcom-regulated independent operator with global reach into enterprise and wholesale markets.
• aql: UK independent fixed and mobile telecom operator providing voice, SMS and messaging infrastructure to enterprises. Comparable as a similarly-sized independent UK carrier targeting enterprise and wholesale customers.
• Simwood: UK wholesale-only VoIP and SMS carrier serving CPaaS platforms, ITSPs and integrators. Closely comparable to Stour's enterprise wholesale motion, Ofcom-regulated status, and niche independent operator profile.
• Truphone (TfB / Telecoms for Business): Independent mobile operator focused on enterprise connectivity and IoT/M2M SIM services globally. Comparable as an independent MNO with SIM-based data services and an enterprise/government customer focus.

Broad incumbents

• Twilio: Global CPaaS leader offering programmable voice, SMS and messaging APIs. Comparable as a customer and channel partner of Stour's wholesale MNO services and a benchmark for the CPaaS market Stour serves.
• Sinch: Global CPaaS provider of messaging, voice and identity services. Listed in Stour's customer set and therefore a direct wholesale buyer; comparable as an incumbent CPaaS counterpart in the same value chain.
• BT Group: UK incumbent telecom operator with national mobile, voice and data networks. Named as a Stour customer and a benchmark for the UK telecom landscape in which Stour operates as an independent MNO.

Market position

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

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 Stour Marine