Stephen Johnson

Fund Principal at Mercia Ventures

📍 Solihull, England, United Kingdom🔄 Updated October 2026💼 7 investments📅 7 years investing🗓 Last invested Oct 2024
VC🌍 United Kingdom
7
Total investments
2
Early stage
1
Mid stage
3
Late stage
7y
Years active

Portfolio

7 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Board Observer
Oct 2024
Run your private healthcare business on one platform. Semble is a clinically robust EHR and practice management system for private healthcare providers of all sizes. Simplify daily operations across scheduling, billing and reporting. Give clinicians one place to record, treat and prescribe. Connect your tools and build automated workflows that scale as you scale. From individual consultants and GPs to large clinics and corporate healthcare providers, over 1400 companies rely on Semble every day.
Board Observer
Aug 2023
Risk Ledger is a pioneering third-party risk management platform that revolutionises supply chain security through a powerful, unified solution. By onboarding and connecting your entire supply chain into an active network, Risk Ledger provides real-time insights to identify concentration risks and emerging threats. Our dynamic network-based model offers a clear view of your entire supply chain, enhancing your ability to visualise and manage risks effectively. With immediate access to a vast, trusted supplier network and continuously updated risk assessments, Risk Ledger streamlines risk management processes, reduces manual workload, and empowers you with unparalleled clarity and control across all supply chain tiers. Risk Ledger provides all the tools you need to run a comprehensive, security-led, third-party risk management programme against your supply chain. The platform moves away from point-in-time assessments by providing you with real-time, actionable data collected directly from suppliers - allowing you to continuously identify, measure and manage a comprehensive set of third-party risks at speed and at scale for a low, per-supplier cost. Our unique network model gives you visibility of supply chain risks beyond third parties to fourth and fifth parties too. Contact us to find out how we can help you to manage risks in your supply chain and follow us on LinkedIn for relevant news and announcements.
Board Member
Sep 2022
Optellum was founded so that every lung cancer patient is treated at the earliest possible stage, and cured. We are redefining early interception of lung disease, by enabling every clinician, in every hospital, to manage their patients in the optimal way. Our first product is the first Clinical Decision Support software for personalized early diagnosis & treatment of lung cancer, based on Artificial Intelligence & Machine Learning applied to the world’s largest clinical dataset. We are a team of world-leading medical imaging software, AI, and clinical experts who met at Oxford’s world-renowned computer vision laboratory. Between us, we have track records of bringing innovation to market through over 10 start-up companies, resulting already in 5 trade-sales and one IPO. We are backed by an Advisory Board comprising world-leading clinicians (global authors of medical guidelines) and experts in deep learning. We are building up our development team – join our fight against cancer, working together with former software engineers from top technology companies (Amazon, Facebook, Redhat) and veterans of medical imaging startups. Learn more at http://www.optellum.com/.
Board Member
Dec 2021
🚀 AI-Powered Test Automation for the Enterprise Synthesized eliminates manual test data bottlenecks, delivering AI-native test infrastructure that enables enterprises to test applications faster, more securely, and at scale. Modern software requires continuous testing, but traditional QA methods are slow, costly, and create compliance risks. Our Agentic AI platform automates test data generation, provisioning, and execution—empowering development and QA teams to accelerate testing cycles while maintaining full regulatory compliance. Why Synthesized? ✔️ AI-Native Test Infrastructure – Fully automated, scalable test data generation across structured and semi-structured enterprise environments. ✔️ Enterprise-Ready – Seamless integration with Snowflake, Oracle, SQL Server, PostgreSQL, Salesforce, SAP, Workday, and more. ✔️ Faster Testing, Lower Costs – Customers see 2x faster test cycles, up to 80% cost savings, and complete test coverage. ✔️ Regulatory Compliance – GDPR, SOC2, HIPAA-ready test data that eliminates compliance risks without slowing down innovation. ✔️ Trusted by Industry Leaders – Used by Deutsche Bank, UBS, the European Commission, and global financial institutions. We are defining the future of AI-driven test automation.
Board Member
Aug 2021
Exceptional Preventative Care Designed For Real Life
Board Member
Mar 2021
Governments, businesses, and communities are facing a rapidly evolving threat landscape online. The scaling of online abuse, growth of mass violence, and advancement of artificial intelligence make it more challenging than ever to ensure public safety. Moonshot develops cutting edge technology – designed with ethics and privacy at the heart – to deliver fast, actionable risk intelligence to partners. But we don’t just understand these problems, we solve them. Moonshot is the world leader in preventing online targeted violence, terrorism, child exploitation, human trafficking, among other threats. We deliver proven methodologies which have saved thousands of lives around the world. This ranges from protecting millions from online manipulation to directly intervening with perpetrators of terrorism online. We end violence, while fundamentally protecting human rights and freedom of speech.
late stagePublic Safety
Board Observer
Sep 2019
At Voxpopme, we believe you shouldnt sacrifice quality to get the insights you need quickly, at a reasonable cost. Insights teams are under immense pressure to deliver reliable answers to crucial business questions with limited resources. We can help. Voxpopme transforms insights teams by collecting, centralizing, and analyzing qualitative data. Voxpopmes Insights Platform combines the speed of Video Surveys with the depth of Live Interviews and UX research, then applies AI to produce insights 60x faster at a fraction of the cost. More brands trust Voxpopme to enrich their research studies and fundamentally transform how they build better products and shape visionary companies. Want to learn how we help solve these problems? Visit www.voxpopme.com today.
Experience · 10 entries
All (10)
Investments (7)
Board (7)
2025
Fund Principal - Northern VCT Funds
Jun 2025
Mercia is a proactive, specialist asset manager focused on supporting regional businesses to achieve their growth aspirations.
2024
Board Observer
Oct 2024
Run your private healthcare business on one platform. Semble is a clinically robust EHR and practice management system for private healthcare providers of all sizes. Simplify daily operations across scheduling, billing and reporting. Give clinicians one place to record, treat and prescribe. Connect your tools and build automated workflows that scale as you scale. From individual consultants and GPs to large clinics and corporate healthcare providers, over 1400 companies rely on Semble every day.
2023
Board Observer
Aug 2023
Risk Ledger is a pioneering third-party risk management platform that revolutionises supply chain security through a powerful, unified solution. By onboarding and connecting your entire supply chain into an active network, Risk Ledger provides real-time insights to identify concentration risks and emerging threats. Our dynamic network-based model offers a clear view of your entire supply chain, enhancing your ability to visualise and manage risks effectively. With immediate access to a vast, trusted supplier network and continuously updated risk assessments, Risk Ledger streamlines risk management processes, reduces manual workload, and empowers you with unparalleled clarity and control across all supply chain tiers. Risk Ledger provides all the tools you need to run a comprehensive, security-led, third-party risk management programme against your supply chain. The platform moves away from point-in-time assessments by providing you with real-time, actionable data collected directly from suppliers - allowing you to continuously identify, measure and manage a comprehensive set of third-party risks at speed and at scale for a low, per-supplier cost. Our unique network model gives you visibility of supply chain risks beyond third parties to fourth and fifth parties too. Contact us to find out how we can help you to manage risks in your supply chain and follow us on LinkedIn for relevant news and announcements.
2022
Board Member
Sep 2022
Optellum was founded so that every lung cancer patient is treated at the earliest possible stage, and cured. We are redefining early interception of lung disease, by enabling every clinician, in every hospital, to manage their patients in the optimal way. Our first product is the first Clinical Decision Support software for personalized early diagnosis & treatment of lung cancer, based on Artificial Intelligence & Machine Learning applied to the world’s largest clinical dataset. We are a team of world-leading medical imaging software, AI, and clinical experts who met at Oxford’s world-renowned computer vision laboratory. Between us, we have track records of bringing innovation to market through over 10 start-up companies, resulting already in 5 trade-sales and one IPO. We are backed by an Advisory Board comprising world-leading clinicians (global authors of medical guidelines) and experts in deep learning. We are building up our development team – join our fight against cancer, working together with former software engineers from top technology companies (Amazon, Facebook, Redhat) and veterans of medical imaging startups. Learn more at http://www.optellum.com/.
2021
Board Member
Dec 2021
🚀 AI-Powered Test Automation for the Enterprise Synthesized eliminates manual test data bottlenecks, delivering AI-native test infrastructure that enables enterprises to test applications faster, more securely, and at scale. Modern software requires continuous testing, but traditional QA methods are slow, costly, and create compliance risks. Our Agentic AI platform automates test data generation, provisioning, and execution—empowering development and QA teams to accelerate testing cycles while maintaining full regulatory compliance. Why Synthesized? ✔️ AI-Native Test Infrastructure – Fully automated, scalable test data generation across structured and semi-structured enterprise environments. ✔️ Enterprise-Ready – Seamless integration with Snowflake, Oracle, SQL Server, PostgreSQL, Salesforce, SAP, Workday, and more. ✔️ Faster Testing, Lower Costs – Customers see 2x faster test cycles, up to 80% cost savings, and complete test coverage. ✔️ Regulatory Compliance – GDPR, SOC2, HIPAA-ready test data that eliminates compliance risks without slowing down innovation. ✔️ Trusted by Industry Leaders – Used by Deutsche Bank, UBS, the European Commission, and global financial institutions. We are defining the future of AI-driven test automation.
Show all 10 entries ↓
Investment activity
2019–2024 · 7 investments
2019120213202212023120241
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