Duncan Johnson
Chief Executive Officer @ Northern Gritstone
Duncan Johnson is a seed investor at Northern Gritstone focused on Software and Health Care. Duncan Johnson is the Chief Executive Officer at Northern Gritstone.
- Total investments:
- 32
- Last investment:
- Lead investor:
- 75%
Last updated:
For AI agents: llms.txt
Industries Duncan Johnson invests in
Stages Duncan Johnson invests in
Countries Duncan Johnson invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Investment Focus
Industry
- Software 8 (25%)
- Health Care 5 (16%)
- Artificial Intelligence 5 (16%)
- Electronics 4 (13%)
- Medical 3 (9%)
Stage
- Seed 17 (53%)
- Series A 9 (28%)
- Pre-Seed 3 (9%)
- Venture - Series Unknown 1 (3%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Cytix develops an AI-powered application security platform that provides continuous security testing across the software development lifecycle. The platform analyzes development changes to identify potential security risks and generates focused testing plans based on the specific vulnerabilities those changes may introduce. Cytix also providesautomated security reviews and targeted micro penetration tests that validate risks in areas such as authentication, authorization, API security, business logic, and other application vulnerabilities. Its platform integrates with development and collaboration tools, including Jira, GitHub, GitLab, Azure DevOps, and Slack, to incorporate security testing into existing workflows. Cytix also offers managed security testing services that combine its automation with human penetration testing expertise. | $7M / Series A / Aug 12, 2026 | ||
| Pixel-Flo is developing a fluidic self-assembly mass transfer process that uses a slot-die mechanism and meniscus forces to continuously position microLEDs onto substrates. This backplane-agnostic technology is designed to assemble red, green, and blue LEDs in a single step for mass-market display manufacturing. | $7M / Seed / Jul 09, 2026 | ||
| Silveray develop affordable large-area direct conversion detectors for the X-ray imaging market. | $6.6M / Series A / Jun 17, 2026 | ||
| AmpliSi focuses on sustainable porous silicon anodes for lithium-ion batteries, with the goal of replacing graphite to increase energy density. | $2.7M / Pre-Seed / Mar 12, 2026 | ||
| Cytotrait focuses on the development of novel traits for food and agriculture. | $4M / Seed / Mar 09, 2026 | ||
| Optalysys solves the fundamental limitations of conventional computing. Optalysys develops optical AI systems that accelerate the demanding deep learning and pattern recognition tasks at groundbreaking speeds but at a fraction of the energy consumption of traditional computing hardware.Optalysys' embeddable technology will enablesupercomputing capability in Edge and mobile devices. | $30.9M / Series A / Jan 22, 2026 | ||
| IVFmicro is a Microfluidic systems for delivering fertility treatment, and optimize methods for Assisted Reproduction Technologies. | $4.7M / Pre-Seed / Dec 15, 2025 | ||
| Sitehop is a technology company that develops cutting-edge cyber-security and networking solutions. Sitehop's custom FPGA solutions are used to optimize and accelerate cloud/telco networks. | $10M / Series A / Oct 09, 2025 | ||
| PhovIR Technologies is a deep-tech firm that specializes in miniaturized near-infrared (NIR) material analytics. | $5.4M / Seed / Aug 19, 2025 | ||
Apini Therapeutics
|
Apini is a creating novel small chemical two most prevalent types of inflammatory bowel disease. | $2.4M / Seed / Jun 11, 2025 | |
| See all 32 investments → | |||
Co-Investors
About Northern Gritstone
Northern Gritstone is an investment firm focused on investing in advanced materials, energy, health technology and cognitive computation.
Northern Gritstone Contacts
| Name | Phone | Socials | |
|---|---|---|---|
|
Duncan Johnson
Chief Executive Officer
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FAQ
What does Duncan Johnson invest in?
Duncan Johnson invests primarily in Software, Health Care and Artificial Intelligence startups, most often at Seed and Series A stage. Most of the 32 investments tracked by Shizune back companies in United Kingdom. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Duncan Johnson?
Public channels for Duncan Johnson include LinkedIn. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Duncan Johnson last invest?
The most recent investment recorded for Duncan Johnson closed in Aug 2026. Shizune tracks 32 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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