Directory

Okta

CorporateCybersecuritySaaSForeign

Okta is a leading identity and access management platform that enables organisations to securely connect their people, applications, and devices. The Okta Identity Cloud provides more than 7,000 pre-built integrations to applications and infrastructure providers. Its products include Single Sign-On, Multi-Factor Authentication, and lifecycle management solutions for both workforce and customer identity.

Old College Capital

VCAIFinanceAcademiaBritish

Old College Capital is the University of Edinburgh's in-house venture investment fund, supporting early-stage spinouts and startups associated with the University. The fund co-invests alongside experienced private-sector partners from pre-seed through to Series A, focusing on sectors including biotechnology, AI, energy, data, robotics, and fintech. Since its founding in 2012, it has committed over £15 million across more than 100 investments, leveraging approximately £100 million in co-investment from partners.

Olombria

StartupAgritechBritish

Precision agtech company using native hoverflies, habitat design, and environmental monitoring tools to boost crop pollination and yields for farmers. Originated from the Royal College of Art and was previously known as FlyPollination.

Omio

ScaleupE-commerceConsumerForeign

Compare and book train, bus, flight, ferry across Europe, the US, Japan, and beyond. One search, 2,000+ travel providers. Find the best prices & fastest routes

Omnea

ScaleupSaaSAIBritish

AI-native procurement orchestration platform for enterprise finance teams, centralising supplier onboarding, risk assessment, and spend management. Has raised over $138 million including a $50 million Series B in 2025, grown to 160+ employees, and was selected for Tech Nation's Future Fifty programme in 2026.

Omni

ScaleupSaaSAIForeign

Omni Analytics turns your data into a source of truth for AI, so anyone can get answers they trust.

One Nucleus

Ecosystem Bodies, Catapults & InstitutionsBiotech & Life SciencesDeep TechBritish

One Nucleus is a not-for-profit life sciences and healthcare membership organisation supporting institutions, companies, and individuals across the UK's Cambridge–London life sciences cluster, with approximately 470 members including pharmaceutical, biotech, medical device, and diagnostic companies. It was formed in 2010 through the merger of Cambridge-based ERBI (established 1997) and the London Biotechnology Network, and provides connectivity, networking events, training, and member services.

One Peak

VCSaaSFinanceBritish

London-based growth equity firm investing in B2B software and tech scaleups from expansion stage through to IPO or exit.

OneBalance

ScaleupFinanceBritish

Crypto software firm building chain/gas abstraction and a cross-chain account framework (Toolkit) so developers can offer instant cross-chain trading, payments and yield via API.

OneID

ScaleupFinanceBritish

Bank-verified, real-time digital identity verification service for onboarding, fraud reduction, age and ID verification, using data from UK banks (e.g. NatWest).

OneTrust

ScaleupCybersecuritySaaSForeign

OneTrust helps companies manage privacy, consent, and AI governance while automating compliance and reducing risk to build trust and drive innovation.

Online Oceans

StartupDefenceDeep TechBritish

Solar-powered autonomous surface vessels (Scout) plus Tether C2 platform for anti-submarine warfare, subsea protection and maritime border security.

Onward

Ecosystem Bodies, Catapults & InstitutionsOtherBritish

Onward is the UK's leading centre-right think tank based in Westminster that develops bold and practical ideas to boost economic opportunity, build national resilience, and strengthen communities. It runs three research programmes covering the economy, the state, and social policy, and works closely with policymakers and businesses across the UK.

Open Climate Fix

Ecosystem Bodies, Catapults & InstitutionsClimateAIBritish

Non-profit AI product lab building open-source solar generation and cloud-movement forecasting models to improve grid reliability and cut emissions.

Open Rights Group

Ecosystem Bodies, Catapults & InstitutionsCybersecurityBritish

Open Rights Group (ORG) is the UK's largest grassroots digital rights campaigning organisation, founded in 2005. It campaigns, lobbies, and pursues legal action to defend privacy and free speech online, tackling issues such as mass surveillance, internet censorship, and AI governance.

OpenAI

CorporateAIAI SafetyForeign

OpenAI is an AI research and deployment company founded in 2015, best known for developing the GPT series of large language models and the ChatGPT consumer product. The company also develops the DALL-E image generation system, the Sora video model, and the Codex coding AI, alongside API products that power numerous third-party applications. OpenAI operates as a capped-profit company controlled by a non-profit board and is among the most prominent organisations in the generative AI industry.

OpenFX

StartupFinanceCrypto & Web3Foreign

OpenFX delivers real-time cross-border FX payments with 90% faster settlement and 80% lower costs than traditional FX. Our global network enables 24/7 money movement.

OpenTable

CorporateFoodtechForeign

OpenTable is a global online restaurant reservation and hospitality management platform, connecting diners with restaurants and helping venues manage bookings, capacity and operations. It is a subsidiary of Booking Holdings.

OpenUK

Ecosystem Bodies, Catapults & InstitutionsOtherBritish

OpenUK is the UK body for the business of open technology, convening business, academia and technologists across open-source software, open-source hardware, open data and open standards. It operates as a not-for-profit company limited by guarantee and runs the annual State of Open Con conference. The organisation advocates for UK leadership in open technology through its Community, Legal & Policy, and Learning pillars.

OpenWeather

ScaleupSpaceSaaSBritish

Weather and environmental data/forecasting platform aggregating satellite, radar, global models and 80,000+ stations via APIs (8M+ users; 2B+ forecasts/day); satellite remote-sensing data layer.

Opna

StartupClimateBritish

Climate finance platform enabling corporates to discover, finance, monitor and manage pre-assessed carbon removal and reduction projects to reach net zero.

Opteran

ScaleupAIBritish

'Natural Intelligence' autonomy chips and software reverse-engineered from insect neural circuits, enabling low-power on-edge perception, navigation and decision-making for robots and autonomous machines.

Optimal Cities

StartupSpaceProptechBritish

PlanTech platform combining GeoAI and satellite intelligence so planners, developers and authorities can diagnose, plan and monitor places, cutting data-analysis time.

Optimove

ScaleupSaaSForeign

Discover Optimove's Positionless Marketing Platform—an AI decisioning engine empowering marketers to execute personalized campaigns independently & at scale.