Directory

Signal AI

ScaleupAIMediaBritish

AI-powered media, risk and reputation intelligence platform that serves regulatory compliance and decision-making for enterprises and public bodies across 226 markets in 75 languages.

Silicon Milkroundabout

CommunityOtherBritish

Silicon Milkroundabout is the UK's largest tech jobs fair, held biannually in London and connecting mid-to-senior technology professionals with startups and scaleups. Founded in 2011, the free-to-attend event has introduced over 100,000 job seekers to companies including Monzo, Snap and DeepMind. Events cover engineering, product, design and data roles.

Silverfleet Capital

PEOtherConsumerBritish

Silverfleet Capital is an independent, partner-owned European mid-market private equity firm established in 2006 as a spinout from Prudential plc's private equity arm (formerly PPM Capital), with roots dating back to 1985. The firm specialises in buyouts of companies with an enterprise value of €25 million to €300 million across healthcare, business services, consumer, and manufacturing sectors, and has been focused on portfolio realisation since abandoning its third-fund raise in 2021.

Smart Pension

CorporateFinanceBritish

Cloud-based retirement savings and pensions platform (Keystone) for employers and providers globally; one of the UK's largest DC master trusts with over £8.5 billion in assets under management.

Sokin

ScaleupFinanceBritish

B2B cross-border payments and treasury infrastructure providing multi-currency accounts across 70+ currencies.

Sona

ScaleupAISaaSBritish

AI-native workforce-management platform (scheduling, HR, payroll, compliance, BI) for frontline retail, hospitality and healthcare.

Sovereign Capital

PESaaSFinanceBritish

Sovereign Capital Partners is a leading UK mid-market private equity firm founded in 2001 and based in London, specialising in Buy and Build investment strategies. The firm manages £650 million in funds and focuses on four sectors: business and technology services, healthcare and pharma services, financial services and insurance, and education and training, investing £10 million to £120 million per transaction across more than 60 platform investments.

Startup Coalition

Ecosystem Bodies, Catapults & InstitutionsOtherBritish

Startup Coalition (formerly Coadec, the Coalition for a Digital Economy) is an independent advocacy organisation that shapes UK policy on behalf of tech startups and scaleups. Founded in 2010, it campaigns across three core pillars — access to talent, access to finance, and regulation — and has a network of over 3,500 startups and investors.

Stemettes

CommunityEdtechOtherBritish

Stemettes is an award-winning UK-based social enterprise and registered charity (operating as Stemette Futures) that engages young women and non-binary people aged 5 to 25 in Science, Technology, Engineering, Arts and Maths (STEAM). Since its founding in 2013 it has reached over 73,000 young people through mentoring, hackathons, academies, and industry events.

Sumsub

CorporateCybersecurityGamingBritish

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

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.

Sylvera

ScaleupClimateAIBritish

Carbon-credit ratings and market-intelligence platform combining satellite imagery, LiDAR and radar with machine learning to independently grade carbon-offset projects.

Syncona

VCOtherBritish

Syncona is a British closed-ended life science investment trust that was established by the Wellcome Trust in 2012, before listing on the London Stock Exchange following a merger with the Battle Against Cancer Investment Trust in December 2016. The firm builds and funds a portfolio of life science companies focused on translating frontier science into transformative therapeutics, spanning pre-clinical through to commercial-stage businesses. Syncona Investment Management Limited operates as the investment manager from its London headquarters.

Synova

PESaaSFinanceBritish

Synova is an independent London-based private equity firm founded in 2007, managing approximately £1.7 billion of capital on behalf of institutional investors and family offices. The firm invests in mid-market UK companies across three interrelated sectors: Software & Data, Tech-Enabled Services, and Financial Services, with transaction values up to £250 million.

THIS

ScaleupConsumerBritish

Plant-based meat-alternative brand making meat-like vegan chicken, bacon and sausages sold in major UK supermarkets and foodservice channels. The company raised £20M in Series C funding in June 2025 to grow its product range.

TIGA

Ecosystem Bodies, Catapults & InstitutionsGamingBritish

TIGA is the not-for-profit trade association representing the UK video games industry, with members including independent games developers, digital publishers, technology businesses, and universities. It influences government policy, accredits university games courses, delivers industry awards, and publishes original research. Its stated vision is to make the UK the best place in the world to develop video games.

Talis Capital

VCFinanceAIBritish

Talis Capital is a London-based venture capital firm founded in 2009 that invests with high conviction at Seed and Series A stages across Europe and the US. The firm backs technology companies in areas including fintech, cybersecurity, deep tech, and digital health, with notable investments including Darktrace, Onfido, and iwoca.

Tech London Advocates

Ecosystem Bodies, Catapults & InstitutionsOtherBritish

Tech London Advocates is a not-for-profit network of over 10,000 tech leaders, experts and investors who champion London as a global technology hub and campaign to address challenges facing the UK tech sector. With no government backing, members volunteer their time to support the grassroots tech community and give the private sector a voice in shaping the ecosystem. The organisation also operates 31 Global Tech Advocates networks across the world's fastest-growing tech cities.

Tech Nation

Ecosystem Bodies, Catapults & InstitutionsOtherAIBritish

Tech Nation is the leading growth platform and industry body for tech startups and their teams across the UK, offering practical knowledge, peer communities, and connections from seed stage through to scale. Founded in 2014, it now operates as part of Founders Forum Group and runs growth programmes, pitch competitions, and talent initiatives spanning AI, deep tech, climate tech, and other high-growth sectors.

Techspace

CoworkingOtherBritish

Techspace is a London and Berlin-based coworking provider focused exclusively on technology companies, offering private offices, shared workspaces, meeting rooms, and event venues. Founded in 2012 in Old Street's tech ecosystem, it hosts hundreds of pioneering teams across six London locations and two Berlin sites. Its community includes scale-ups and established tech firms such as Databricks, Plaid, and Tesla.

Ten Eleven Ventures

VCCybersecurityForeign

Multi-stage global venture capital firm specialising exclusively in cybersecurity, with offices in Silicon Valley, Boston, Boulder, and London.

Tenpoint Therapeutics

ScaleupBiotech & Life SciencesForeign

Tenpoint Therapeutics is a UK-based biopharmaceutical company focused on ophthalmology, best known for YUVEZZI, the first FDA-approved dual-agent combination eye drop for presbyopia, which received US regulatory approval in January 2026. The company raised $235 million in debt and equity to support commercialisation and has a growing pipeline in vision correction.

Tessl

ScaleupAIBritish

Tessl is an AI-native software development platform that takes a specification-centric approach, allowing developers to define software behaviour in natural language and having AI generate and maintain the resulting code. The company raised $125 million in 2024 at a reported $750 million valuation.

The Payments Association

Ecosystem Bodies, Catapults & InstitutionsFinanceBritish

The Payments Association is the UK's leading trade body and community for the payments industry, representing over 250 member organisations spanning banks, fintechs, merchants, and payment providers. It delivers events such as PAY360, publishes policy research, and runs working groups across areas including digital currencies, open banking, and financial crime. Founded in 2008 by Tony Craddock, it has since expanded to include communities in the EU and Asia.