Directory

Stratiphy

StartupFinanceAIBritish

FCA-regulated AI-powered retail investing platform allowing individuals to build, backtest and automate personalised investment strategies without coding. In April 2026 became the first UK platform to offer crypto ETNs within a tax-free ISA wrapper.

Strava

CorporateConsumerForeign

Strava connects millions of runners, cyclists, hikers, walkers and other active people through the sports they love – all on our mobile app and website.

Street Group

StartupProptechSaaSBritish

The all-in-one CRM for sales, lettings, property management and client accounting. Built for UK estate agents setting the standard.

Stride.VC

VCSaaSConsumerBritish

Stride.VC is a London-based seed-stage venture capital fund that backs early-stage technology companies primarily in the United Kingdom and France. Founded in 2018, the firm is sector-agnostic and focuses on partnering with entrepreneurs from the earliest stages of company building; it raised two funds totalling approximately £220 million but announced in 2023 that it would not raise a third fund.

Strider

ScaleupDefenceDeep TechForeign

Strider transforms publicly available data into strategic intelligence to secure and advance innovation.

Stripe

ScaleupFinanceForeign

Stripe is a financial infrastructure platform that enables businesses to accept payments, manage revenue, and access a suite of financial services online. Founded in 2010, the company processes over $1 trillion in annual payment volume and serves millions of businesses globally, including a large proportion of Fortune 100 companies. Stripe maintains dual headquarters in San Francisco and Dublin, with a flagship UK engineering and operations office in the City of London.

Substack

ScaleupMediaSaaSForeign

The app for independent voices

SumUp

CorporateFinanceBritish

Payments fintech providing card readers, POS and merchant tools to small businesses across 30+ markets.

Summit Partners

PESaaSFinanceVCForeign

Summit Partners is a global growth-focused alternative investment firm founded in 1984, with over $44 billion in assets under management. The firm invests in technology, healthcare and life sciences, and growth products and services companies, typically at growth equity and late-stage venture stages. Summit maintains offices in Boston, Menlo Park, New York, London (Mayfair), and Luxembourg.

Sumo Logic

CorporateCybersecuritySaaSForeign

Sumo Logic provides best-in-class cloud monitoring, log management, SIEM tools, and real-time insights for web and SaaS based apps.

Sumsub

CorporateCybersecurityGamingBritish

Full-cycle identity verification, KYC/AML, transaction monitoring and fraud-prevention platform serving fintech, crypto, trading, e-commerce and gaming clients globally.

Sunnybarn Investments

PEOtherBritish

Sunnybarn Investments is a family-run risk capital investment company based in Brecon, Wales, established in 2017 to support ambitious individuals and management teams in Wales. The firm provides equity funding and mentoring across a broad range of sectors and co-invests alongside the Development Bank of Wales. It has invested in a range of Welsh companies including Marine Power Systems and Coincover.

Sunsave

ScaleupClimateBritish

Zero-upfront solar-and-battery subscription (Sunsave Plus) making residential rooftop solar accessible across England and Wales.

Sunswap

ScaleupClimateLogisticsBritish

Manufactures Endurance, a solar- and battery-powered zero-emission transport refrigeration unit for cold-chain logistics.

Super Payments

StartupFinanceBritish

Online checkout payment service letting shoppers pay via bank account, with merchants paying commission only on incremental sales.

SuperFi

StartupFinanceBritish

Debt-prevention platform helping people manage bills, arrears and access support; partners with GLA on cost-of-living interventions.

Supercell

CorporateGamingForeign

Visit Supercell.com and find out more about us and our games.

Supercritical

ScaleupClimateBritish

Develops a high-pressure, membrane-free supercritical electrolyser to produce ultra-low-cost, high-purity green hydrogen for chemicals and synthetic fuels.

Superseed

VCAIDeep TechBritish

London-based VC backing pre-seed and seed-stage technical founders bringing AI to manufacturing, logistics, construction, defence, energy, and infrastructure.

Superteam UK

CommunityCrypto & Web3AIGrantmakerIncubator / AcceleratorBritish

Superteam UK — Building the Solana ecosystem in the UK

Surrey Investors Club

VCOtherBritish

Surrey Investors Club was an angel investment network incorporated in November 2016 and registered in Winchester, England, focused on seed-stage investments in UK companies. The club merged with Angels 5K on 1 January 2021 to form the Southern Angel Investors Club, with members from both clubs having collectively invested over £11 million across more than one hundred high-growth UK companies prior to the merger.

Sussex Innovation

Incubator / AcceleratorOtherAcademiaCoworkingBritish

Sussex Innovation Centre is a wholly-owned subsidiary of the University of Sussex, founded in 1996, providing office space, business support, consultancy, and accelerator programmes to startups, scale-ups, and established businesses. Based on the University of Sussex campus in Falmer, Brighton, it has supported more than 750 businesses since its founding and runs the AccelerateTech growth programme alongside its University of Sussex Business Angels investor network.

Sustainable Ventures

CoworkingClimateVCIncubator / AcceleratorBritish

Sustainable Ventures is Europe's largest climate tech ecosystem, providing co-working spaces, SEIS/EIS investment, and venture support exclusively for climate technology startups and scaleups. Its flagship London hub occupies the fifth floor of the iconic County Hall building on the South Bank, with further hubs in Manchester, Glasgow, Belfast, and Cambridge. The organisation has supported over 1,000 startups, helping raise more than £1 billion in equity funding.

Swap

ScaleupE-commerceAIBritish

Swap powers global ecommerce for modern brands: agentic storefronts, cross-border shipping, duties and taxes, returns, and compliance on one platform.