Directory

OLIO

ScaleupConsumerClimateBritish

Community sharing app enabling neighbours and local businesses to give away surplus food and unwanted household items for free, diverting them from landfill. Operates globally with millions of users and works with major retailers and food-service businesses on surplus redistribution.

OLIX Computing

ScaleupAIBritish

Photonic AI inference chip company developing an Optical Tensor Processing Unit (OTPU) that integrates SRAM with photonics, bypassing high-bandwidth memory to deliver GPU-competitive economics at lower cost. Raised $220 million in 2026, achieving unicorn status, with first customer shipments planned for 2027.

OMERS

PEOtherVCForeign

OMERS (Ontario Municipal Employees Retirement System) is one of Canada's largest defined benefit pension plans, founded in 1962, with approximately C$145 billion in net assets. It invests globally across private equity, infrastructure, real estate, and venture capital through dedicated platforms including OMERS Private Equity, OMERS Ventures, OMERS Infrastructure, and Oxford Properties. The fund serves over half a million active, deferred, and retired Ontario municipal employees.

OMERS Private Equity

PEOtherForeign

OMERS Private Equity is the private equity arm of the OMERS pension plan, with over 30 years of experience investing in mid-market companies globally. It targets businesses with enterprise values of approximately $200 million to $1.5 billion, focusing primarily on buyout transactions across healthcare, technology, professional services, and consumer sectors. The firm invests directly and through co-investments, operating from offices in Toronto, New York, and London.

OPUS

CommunityOtherCoworkingBritish

OPUS is a membership community for early-stage founders, funders, and operators, providing networking events, a member directory, and coworking space at its headquarters in Holborn, London. Founded as 20FORTY LIMITED in September 2020 and rebranded to OPUS in 2023, it has expanded internationally with a presence in Dubai and South Africa. The community aims to connect ambitious entrepreneurs through peer-to-peer support and curated events.

ORCA Computing

ScaleupQuantumDeep TechBritish

Full-stack photonic quantum computing company building room-temperature, scalable photonic quantum systems. Deployed the first photonic quantum system at the UK National Quantum Computing Centre (NQCC) and develops hardware for both standalone and hybrid classical-quantum deployments.

ORE Catapult

Ecosystem Bodies, Catapults & InstitutionsClimateBritish

The Offshore Renewable Energy Catapult (ORE Catapult) is the UK's leading technology innovation and research centre for offshore renewable energy, established in 2013 by Innovate UK. It accelerates the creation and growth of UK companies in offshore wind, wave, and tidal energy, operating eight locations across the UK including the National Renewable Energy Centre in Blyth. The organisation employs over 300 people and collaborates with industry, government, and academia.

OSSTEC

StartupBiotech & Life SciencesDeep TechBritish

Orthopaedic medtech company developing 3D-printed knee implants with biomimetic cementless fixation to improve joint replacement outcomes and surgical workflows.

OTIF Ventures

VCAIBritish

Oxford Investment Consultants LLP, trading as OTIF Ventures, is a venture capital firm established in 2015 that backs early-stage, EIS-eligible university spinout companies from leading UK research institutions, particularly Oxford and Cambridge, across Life Sciences, Deep Tech, and Physical Sciences. The firm provides EIS-eligible funding alongside board representation and strategic support, and has made investments in over 38 companies including notable exits such as Oxitec and OrganOx.

OakNorth Bank

ScaleupFinanceBritish

Digital SME lender and bank using proprietary data analytics to provide bespoke loans to mid-sized businesses across the UK.

Oakley Capital

PESaaSConsumerBritish

Oakley Capital is a London-based private equity firm founded in 2002 that invests in mid-market companies across Europe, with a focus on the technology, consumer, education, and business services sectors. The firm manages over €1.5 billion in assets under management and has more than 160 professionals across offices in London, Munich, Milan, Madrid, and Luxembourg.

Oaktree

PEFinanceReal EstateForeign

Oaktree Capital Management is a global alternative investment management firm founded in 1995 and headquartered in Los Angeles. The firm specialises in credit, equity, and real estate strategies with a value-oriented, risk-controlled approach, managing approximately $224 billion in assets. It has over 1,500 employees and offices in 24 cities worldwide, and is majority-owned by Brookfield Asset Management.

Oato

StartupConsumerBritish

Fresh British oat-drink brand made from UK-grown oats, delivered in reusable glass bottles via milk rounds and sold through major retail listings.

Ocado Group

CorporateLogisticsAIBritish

FTSE-listed technology and logistics group best known for its Ocado Smart Platform, which uses fleets of grid-based robots to automate grocery fulfilment; licences the platform to retailers globally.

Occam Industries

StartupDefenceDeep TechBritish

Software-only autonomy for unmanned and autonomous machines, enabling low-cost drones and robots to operate independently of GPS and communications links — resilient to jamming and signal loss. Raised a €3 million pre-seed round in 2026 and has completed field testing with the Ukrainian DefenceTech cluster Brave1.

Octopus Electric Vehicles

ScaleupClimateBritish

UK's largest EV-only leasing company, offering salary-sacrifice EV schemes for businesses alongside home and public charging solutions and green energy tariffs. Funds over 27,000 cars and is expanding into fleet electrification services.

Octopus Energy Group

CorporateClimateBritish

Renewable energy supplier and clean-technology group operating in multiple countries, with its proprietary Kraken energy-management platform, EV leasing, heat pumps, and a substantial renewables generation portfolio. One of the UK's largest energy suppliers by customer numbers.

Octopus Group

CorporateFinanceSaaSVCBritish

Octopus Group is a UK-based holding company founded in 2000 that operates across financial services, energy, and education. Its subsidiaries include Octopus Investments (fund management and tax-efficient investment products), Octopus Ventures (venture capital), Octopus Energy, and Octopus Money, collectively employing over 8,500 people and serving millions of customers worldwide.

Octopus Ventures

VCFinanceAIBritish

Octopus Ventures is a London-based venture capital firm and subsidiary of Octopus Group, founded in 2007, and one of the largest and most active VC investors in the UK and Europe. The firm has backed over 180 companies across health, fintech, deep tech, climate, B2B software, and consumer sectors, investing from pre-seed through Series A and beyond, and is a certified B Corporation.

Oddbox

ScaleupClimateConsumerBritish

B Corp subscription-delivery service rescuing surplus and cosmetically imperfect fruit and vegetables directly from farms across the UK and Europe, reducing food waste at source. Delivers customisable weekly boxes to homes across England.

Odin

StartupFinanceSaaSFunding PlatformBritish

Odin is a UK fintech platform that enables angel investors, fund managers, and founders to launch and run investment vehicles entirely online. The platform handles SPV creation, investor onboarding, KYC/AML, banking, legal structuring, and post-close administration, and administers over $500 million in assets across pre-seed to pre-IPO investments. Founded in 2019, Odin operates as an Authorised Representative of Talbot Capital Limited, regulated by the FCA.

Odysseus Investments

VCFinanceReal EstatePEBritish

Odysseus Investments is the venture capital and private equity arm of Reech Corporations Group, founded in 2015 and publicly launched in 2020, and headquartered in London. The firm focuses on driving the digitisation of traditional finance, insurance, and real estate sectors, partnering with businesses that have proven models set to benefit from technology, financial structuring, or scaling expertise.

Ofcom

GovernmentMediaBritish

Ofcom is the UK's communications regulator, responsible for television, radio, telecoms, and postal services, as well as online safety regulation under the Online Safety Act 2023. It was established by the Communications Act 2003 and is a statutory corporation accountable to Parliament. Ofcom operates across multiple UK offices including London, Edinburgh, Cardiff, and Belfast.

Offset Labs

StartupDefenceAIBritish

UK-Ukrainian AI lab for defence and national security, building frontier AI models for signal and voice processing in operational environments. Formerly known as Byne; raised a €600,000 pre-seed round in 2025 led by Archangel Ventures with participation from Amadeus Capital Partners.