United Kingdom startup ecosystem
The UK — and London in particular — remains Europe's deepest capital market for startups. World-class universities, a strong financial services sector, and a dense network of experienced operators make it a magnet for fintech, AI, and biotech ventures. Despite Brexit-related shifts, the UK continues to produce more unicorns than any other European country. The directory currently lists 317 organisations across 21 cities.
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Granola
Granola is a London-based maker of an AI-powered meeting notepad. The app combines a user's own typed notes with AI-generated content derived from a meeting's audio transcript, and captures audio directly from the user's device rather than sending a visible bot into video calls. It works across platforms such as Zoom, Google Meet, and Microsoft Teams, and offers calendar integration, pre-meeting briefings, an AI chat over meeting context, and an iPhone app for in-person notes. The company was founded in 2023 by Chris Pedregal and Sam Stephenson and has expanded from an individual meeting notetaker toward a collaborative AI workspace for teams.
Graphcore
Graphcore is a Bristol-based semiconductor company founded in 2016 that designed the Intelligence Processing Unit (IPU), a processor architecture built from the ground up for machine learning and AI workloads. The company raised over $700 million from investors including Sequoia Capital, BMW, Microsoft, and Samsung, reaching a valuation above $2.5 billion. Graphcore developed both hardware and a Poplar software stack to compete with NVIDIA in the AI accelerator market. Its IPU technology represented one of Europe's most ambitious attempts to build a homegrown AI chip ecosystem.
Greg Orlowski
Co-founder and former CTO of Deliveroo, where he built the early technology platform alongside Will Shu before the company's rapid European expansion.
Guillaume Pousaz
Founder and CEO of Checkout.com, the payments processor he bootstrapped before it became one of Europe's most valuable fintechs. A Swiss entrepreneur based in London, he is among the wealthiest people in UK tech.
Guy Podjarny
Co-founder of Snyk, the developer-security company, and previously CTO of Akamai's web-experience business after it acquired his startup Blaze. A prolific application-security expert and author.
Gymshark
Gymshark is a Birmingham-based direct-to-consumer fitness apparel brand founded in 2012 by Ben Francis when he was 19 years old. The company became one of the UK's fastest-growing brands by leveraging influencer marketing and social media before it was standard practice, building a devoted community of fitness enthusiasts. Gymshark reached unicorn status in 2020 when General Atlantic invested at a $1.45 billion valuation. The brand sells primarily online across 180+ countries and has expanded into physical retail. It is one of Europe's best examples of a DTC brand scaling without traditional retail.
Harry Nelis
Partner at Accel in London, investing in enterprise software, AI and fintech. His portfolio includes Vinted, Celonis, Miro, Deliveroo and Personio, and he has been a long-standing figure in Accel's European franchise.
Herman Narula
Co-founder and CEO of Improbable, the simulation and virtual-worlds company backed by a16z and SoftBank. He is a vocal advocate for the technical foundations of the metaverse.
Hermann Hauser
Austrian-British technology entrepreneur and investor, co-founder of the Cambridge-based venture firm Amadeus Capital Partners. He earlier co-founded Acorn Computers, the company whose work led to the ARM processor architecture, and has spent decades backing deep-tech, semiconductor and life-science startups across Europe.
HETT Show 2026
The UK's leading digital-health conference and exhibition, bringing NHS leaders, policymakers, clinicians, and tech companies together at ExCeL London. For a healthtech founder it is the key venue to understand NHS procurement, demo to buyers, and meet partners driving digital transformation in care.
HiBob
All-in-one HR platform ('Bob') for mid-sized and multinational companies covering core HR, talent, payroll, benefits, workforce planning and an embedded AI assistant. Founded 2015 with London and Tel Aviv roots.
Homeppl
Homeppl is a London-based customer risk platform that helps real estate and lending businesses reveal fraud, verify income and affordability, and qualify applicants using open banking data, document analysis, and a fraud database. Its products include Fraud Finder for document fraud detection and financial qualification tools used by clients such as Knight Frank, Quintain Living, and Portman Asset Finance to cut fraud losses and speed up approvals. Homeppl operates as a trading name of Thirdfort Limited, a UK company registered in London.
Hometree
Hometree is a London-based home cover and energy services provider offering boiler and home emergency cover, plumbing and drains cover, appliance cover, and landlord plans across mainland England, Scotland and Wales, alongside renewable energy installations including heat pumps and solar panels. The company promises no unfair price hikes at renewal and offers 24/7 claims support with a UK-based call centre. It operates as a trading name of Hometree Services Limited and Hometree Marketplace Limited, both regulated by the UK Financial Conduct Authority.
Hopin
Virtual and hybrid event platform enabling immersive conferences, expos, and town halls. Hopin is a startup based in London, United Kingdom at the growth stage. The company operates in the Events, Software space. Learn more at their website.
Hoxton Ventures
Hoxton Ventures is a London firm that calls itself European venture with a Silicon Valley mindset, backing companies in Europe and the US and pushing them at the US market early. It is deliberately anti-thematic, investing in new market categories that are not obvious at the time, and names Deliveroo, Darktrace and Preply among roughly 90 portfolio companies.
ICONIQ Growth
ICONIQ Growth is the growth-equity and venture arm of ICONIQ, investing in technology companies from early traction through IPO and beyond. It partners with founders at critical inflection points across software, fintech and other sectors, and invests internationally including from a London presence.
Improbable
Improbable is a London-based technology company founded in 2012 that builds networked simulation and virtual world infrastructure. Originally known for SpatialOS, a distributed computing platform enabling massive-scale game worlds, the company pivoted toward defense and metaverse applications. Improbable raised over $600 million including a $502 million Series B led by SoftBank in 2017. Its defense division provides synthetic environments for military training and planning. The company also explored metaverse networks before refocusing on enterprise and government simulation use cases.
Index Ventures
Index Ventures is a globally renowned venture capital firm that originated in Europe and has been instrumental in scaling many of the continent’s top tech companies. Founded in Geneva in 1996 by the Daly brothers and Neil Rimer, Index later opened major offices in London and San Francisco, making it a transatlantic VC powerhouse. Index invests at all stages (seed to growth), though it is especially prominent in Series A/B in Europe. The firm has an extraordinary track record: it was an early backer of Skype (sold to eBay), Last.fm (sold to CBS), Supercell (acquired by Tencent), and MySQL (acquired by Sun) in the 2000s, and more recently of Deliveroo, Adyen, Figma, Revolut, Robinhood and Notion – to name a few. Index’s portfolio spans consumer and enterprise: it has seeded fashion marketplaces like ASOS and Farfetch, scaled up fintech stars like TransferWise (Wise) and Robinhood, and supported open-source and SaaS successes (Elastic, Confluent, Collibra). The firm manages multiple funds (it raised a $3B+ set of funds in 2022) and often co-invests across its early and growth funds to support companies long-term. Index is particularly known for its knack in consumer-facing startups and its ability to spot trends early (e.g., it led Patreon’s Series A in the creator economy space, and Discord’s seed in gaming communication). Partners at Index are a cosmopolitan bunch – with backgrounds ranging from gaming entrepreneurs to investment bankers – and they bring a strong network in both Silicon Valley and Europe. Uniquely, Index also has a life sciences arm (Index Life) that invested in companies like Moderna. In Europe, Index has been among the top three most active VCs by number of unicorns backed. For example, Index led Deliveroo’s Series B in 2014 and remained a major shareholder through its 2021 IPO. Similarly, Index was pivotal in Adyen’s growth (now a ~$50B payments giant). Culturally, Index is known for being founder-friendly and global in outlook – encouraging its European portfolio to expand to the US when needed and vice versa. It also frequently publishes insightful content (e.g., Bernard Dallé’s guides on SaaS metrics or interviews with founders). As of 2025, Index Ventures stands as a gold-standard VC, with a portfolio boasting dozens of IPOs and acquisitions, and a current crop of rising stars across continents.
Ineffable Intelligence
London-based AI research lab founded by David Silver, former lead of DeepMind's reinforcement-learning team, aiming to build a self-improving AI that discovers knowledge entirely from experience without relying on human-labelled data. Raised a record $1.1B seed round at a $5.1B valuation, backed by Sequoia, Lightspeed, Nvidia, Google, and the UK's Sovereign AI Fund.
Informa Connect
Informa Connect is the events division of Informa PLC, running large B2B conferences and exhibitions across technology, finance, life sciences and marketing. Its technology programme includes The AI Summit series, whose London edition gathers enterprise AI buyers, vendors and researchers at ExCeL alongside the wider London technology calendar.
