London startup directory
Hand-picked startups, investors, and ecosystem operators in London, with a custom city illustration in europe-startup-guide.com brand colors.
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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.
Innovate Finance Global Summit (IFGS) 2026
Flagship day of UK FinTech Week held at London's historic Guildhall, attracting senior policymakers, regulators, and fintech leaders. Tickets cost about GBP 900-1500. Features keynotes on open banking, digital currencies, and regulatory sandboxes. Essential for fintech startups seeking visibility with UK regulators and institutional partners.
Insight Partners
Insight Partners is a New York-headquartered global venture capital and private equity firm with a significant London presence, founded in 1995. The firm manages over $80B and is one of the world’s largest dedicated software investors, backing companies from Series B through IPO and beyond. Insight has invested in 800+ companies globally including Shopify, Twitter, Vinted, Wiz, and SemRush. In Europe, the firm actively invests in growth-stage software, SaaS, and data infrastructure businesses, typically deploying $50-200M per deal and providing its proprietary Insight Onsite operational support platform.
Insurtech Insights Europe 2026
Largest European insurtech conference with carrier decision makers and startup kiosks. Price: about GBP 1500-2500. Great for claims automation and risk analytics startups.
Insurtech Insights Europe 2027
Insurtech Insights Europe returns 3-4 March 2027 to the InterContinental London – The O2, billed as Europe's largest insurtech conference. The 2026 edition gathered more than 6,000 executives, entrepreneurs and investors from around the world. The 2027 agenda is now open for speaker submissions.
IntechOpen
IntechOpen is a London-based open access scientific publisher, founded by two scientists to make research more accessible, that publishes peer-reviewed books, book chapters and journals spanning engineering, medicine, and the physical and life sciences. The platform lets authors publish under open access terms so their work reaches a global research audience and earns more citations. IntechOpen is a portfolio company of Croatian investor Prosperus Invest.
Intelligent Automation Expo 2026
Conference track at ExCeL London covering RPA, AI-driven process automation, and the future of work, co-located with major tech expos. Attracts enterprise operations leaders and automation buyers from finance, healthcare, and manufacturing. Relevant for startups building intelligent automation, workflow orchestration, and AI-powered business process tools.
Intelligent Automation Expo 2027
Intelligent Automation Expo 2027 runs 3-4 February at Olympia London, part of TechEx Global. Aimed at Chief Automation Officers, heads of enterprise AI and transformation leaders, the event covers human-in-the-loop productivity, enterprise automation use cases, AI agent orchestration and generative AI interfaces in operations.
Interactive Investor
Interactive Investor was founded in 1994 by Sherry Coutu as one of the UK's first online retail investment and brokerage platforms. It floated on the London Stock Exchange in 2000 and was sold to AMP in 2001 following the dot-com crash. After a 2003 management buyout the business was rebuilt independently, and in 2022 it was acquired by abrdn for £1.49 billion, becoming one of the UK's largest flat-fee investment platforms.
International Cyber Expo 2026
A major cyber security gathering at Olympia London with 100+ global suppliers, three stages, live demonstrations and 100+ speakers. It attracts thousands of senior visitors and government officials from across the world, offering visibility for cyber security startups and vendors.
IoT Tech Expo Global 2026
Massive IoT event co-located with AI & Big Data and Blockchain expos. Price: free Expo Pass; paid passes about GBP 499-1099. Strong for edge computing, industrial IoT, smart cities, and applied IoT across transport and healthcare.
IoT Tech Expo Global 2027
IoT Tech Expo Global 2027 runs 3-4 February at Olympia London, the leading UK event for IoT, industrial AI and autonomous operations as part of TechEx Global. Over two days it covers embedded systems, edge AI, digital twins, autonomous infrastructure and IoT security, alongside seven co-located TechEx shows.
Itxaso del Palacio
General Partner at Notion Capital investing in B2B software and AI across Europe. With a PhD and a background spanning operating and investing roles, she works with founders scaling from product-market fit toward growth.
Jacomo Corbo
Co-founder and CEO of PhysicsX, applying AI to engineering simulation for aerospace, automotive and energy. He was previously co-founder and chief scientist of QuantumBlack, acquired by McKinsey.
Jan Hammer
Partner at Index Ventures leading the firm's fintech practice from London. He sits behind investments in Adyen, Robinhood, Wise, Alan and Collibra, and has been a long-standing board member at several of Europe's most valuable financial-technology companies.
Jeppe Zink
Partner at Northzone based in London, investing across software and fintech in Europe. He works with founders from seed through growth and is a prominent voice on European venture and scale-up building.
Jessica Bilcock
Public Policy & Vulnerability Manager at Monzo Bank, the UK digital challenger bank, where she works on financial inclusion, consumer protection and open-banking policy. She is an announced 2026 speaker at the Open Banking Expo UK & Europe in London.
