Top Tech Startups in London, United Kingdom in 2026

At Permutive, we believe companies should be able to make big data actionable by anyone. We make this easy with a single, edge computing platform that’s used by the largest publishers in the world. Our API lets our customers programmatically collect, store, filter and react to any user event in real time; by providing a powerful query layer that means they can personalise every user experience on the fly. Our technology is fundamentally different. Every day we process billions of events across hundreds of millions of users - and we give results in milliseconds. We’ve built the world’s fastest Data Management Platform and the implications are huge.

At Ledgy we believe that entrepreneurship is a main driver of positive change in the world. By democratizing ownership in startups, we not only help startups attract the best talent but also allow employees to become owners and eventually entrepreneurs themselves. We create transparency for all owners of a startup, and bring scalability to important processes for founders such as managing their stockholders, preparing financing rounds, managing investor relations, and granting equity to all their employees. Our customers are the leading scale-ups across Europe, like Frontify, Wefox, VIU, NA-KD, and many more. Since our incorporation in 2017, we’ve been listed every year among the TOP 100 of Swiss startups and are ranked as the #1 ICT startup in Switzerland as well as in the Top 10 Swiss Fintech startups to watch in 2020. Our plans for 2021 include expanding throughout Europe and building on the traction we've built throughout the UK, the Nordics, and beyond. Join us on our mission.

Securing the software development process, with a focus on improving developer velocity.

Capital on Tap believe that the future is all about the impact that small businesses can have in the world. As such we are on a mission to help them thrive – cash flow shouldn’t be a barrier to success. Since launching our business credit card and business loans in 2017 we have been taking off like a rocket! We are one of the fast growing companies in the UK (Sunday Time Fast Track 100 in 2017 and 2018) while still posting a profit to fund our future growth. 2019 looks to be just as exciting (and busy!) as we continue on our incredible trajectory. Our people (and our office dogs) really are the best thing about working at Capital on Tap. We have built a dynamic, fun and vibrant culture where your opportunities for growth are as big as your ambitions.

We empower GTM leaders to build a consistent brand across every customer touchpoint. Our automated language generation and writing suggestions make it possible for teams to accelerate content, align brand, and empower more writers across all types of content and communications. Enterprise-class and simple to roll out, Writer is deployed widely at leading brands like Twitter, Intuit, UiPath, UnitedHealthcare, Accenture, and Spotify.

Ably provides an infrastructure layer to handle complex, behind-the-scenes realtime communication that powers things like chat, live updates in maps or apps, IoT device control, and more. There's no infrastructure to provision or manage - just simple yet powerful and versatile SDKs and APIs that let you quickly add innovative realtime capabilities to your application with a few lines of code.

We're a team of machine learning and product engineers training task-specific generative models for psychology. Our mission is to use AI to make mental healthcare more accessible and to help people change their lives in the ways they want. We partner with organizations around the globe and power use cases, including AI-assisted crisis text response and AI counseling, while securing best-in-class datasets to power our models. Success to us means every human being in need of support having somewhere to go. We're a well-funded, seed-stage startup backed by top-tier tech investors involved in ElevenLabs, Captions, Shopify, Plaid, Notion, Canva, Twitch, Airtable, and others. We're building a powerful team by empowering our engineers with the autonomy, flexibility, and resources to do their best work. We dream big and iterate fast. If that sounds like home, we'd love to hear from you. The Team Daniel started coding at age 8 and started training models in high school. At 16, he dropped out of high school and moved to London to pursue his study and research. He graduated university top of his class at 19 and was awarded ‘distinguished’ by Imperial for his post-grad research in AI for mental health. As an ML Engineer, he led Instabase’s pivot into GenAI. He raised $6M pre-team at age 22 to develop the tools for training task-specific generative models that now power our machine learning research. Neil dropped out of medical school to co-found Casper, the sleep company, which he helped grow to $500M+ in revenue and IPO’d in 2020. Improving wellbeing through sleep led him to mental health, where he joined the board of [PsychHub](psychhub.com). He’s invested in 200+ companies like Ro, Affirm, Relativity, Archer, Figure, and Together.AI. Our team has expertise in model training, product engineering, and psychology. Our engineers includes team leaders who have joined us as individual contributors, two former CTOs, and collective experience from across Big Tech.

Our approach is rigorous and pragmatic, driven by technological expertise and analytics informed by real-world experience. We value employees who love to learn and have the tenacity, curiosity and willpower to contribute to our continuing success. We are a small but passionate team, dedicated to enhancing and refining our tried and true methods as we commit to our ongoing growth and performance.

MOLTEN is a cloud platform that streamlines core operations of media and entertainment enterprises. MOLTEN digitizes and transforms rights, content, and licensing operations across enterprises, empowering teams with real-time insight and automation tools to do more, accelerating deal-making and content monetization worldwide. MOLTEN offers multiple integrated cloud-based services to power back-end operations for media and entertainment enterprises, which include content rights, storage, delivery and licensing management.

Coinrule catches the next market opportunity on your behalf by automating your investments with AI. Coinrule automates your crypto and stock investments across multiple exchanges like Binance, Coinbase, Kraken, etc., and Trading212, Tradier, Alpaca, E-Trade, etc. for stocks. Protect your funds and catch the next great market opportunity - AI Agentic trading without having to learn a single line of code. Choose a pre-built strategy or build your own. >> Watch how we got so far bit.ly/CoinruleVideo >> coinrule.com