| AutumnCompanies | Open-source billing layer on top of Stripe that lets AI start-ups set usage, credit and subscription pricing.AI pricing and billing infrastructureKey facts Team size 5 (YC profile, 2026-10); says used in production by "100s of developers" | London | ycombinator.com/companies/autumn | one source |
| CloudsmithCompanies | Makes cloud software in which companies store, check and share the software packages and AI models they build with.developer toolsProfile- Chief executive
- Glenn Weinstein — from null (CEO in 2026-04); Alan Carson was CEO in 2021
- Hq
- Belfast (Northern Ireland)
- What it does
- A cloud service where software teams store, secure and control the packages and other "artifacts" their code depends on; it pitches this at the growing volume of code written by AI coding agents.
- Products
- cloud-native artifact management platform — date null
- Rounds found
- 2021 — funding — 11m GBP — null — null (planned 60 more staff and US sales and engineering growth); c. 2025 (UKTN: "about a year earlier") — Series B — 18m GBP — null — null; 2026-04-23 — Series C — 72m USD (53.4m GBP) — TCV — Insight Partners and other existing investors (already DEAL-SW-051)
- Status now
- Active; Belfast-based artifact management company that raised a 72m USD Series C in April 2026.
- Confidence
- single_source
Round 6 deep profile (30 Oct 2026), as the researchers wrote it; sources are listed in the record panel. | Belfast | Companies House · uktech.news/funding/uk-tech-funding-roundup-this · find-and-update.company-information.service.gov. · find-and-update.company-information.service.gov. · mmc.vc/portfolio/ | verified |
| Codeplay SoftwareCompanies | Software company now owned by Intel; the lead says it builds compilers and tools that let AI and other programs run on many kinds of chip (not verified here). acquiredcompilers | Edinburgh (Alex's Places file; not verified) | Companies House · find-and-update.company-information.service.gov. · find-and-update.company-information.service.gov. | one source |
| Context.aiCompanies | Analytics for developers of AI chatbots, showing where a large language model product performs well and where it fails.developer tools | London | uktech.news/ai/context-ai-funding-google-2023083 | one source |
| CosineCompanies · also on Labs | Makes Genie, an AI software engineer that fixes bugs, builds features and rewrites code on its own or with human developers.coding agentsProfile- Founded
- 2022 (UKTN)
- Founders
- Alistair Pullen — co-founder and CEO; Yang Li — co-founder, COO; Sam Stenner — co-founder (role not stated)
- Chief executive
- Alistair Pullen — from null
- Hq
- null (UKTN does not state)
- What it does
- Builds Genie, an AI coding agent ("Artificial Developer") that fixes bugs, builds features and refactors code alone or alongside human developers. Backed by Y Combinator.
- Products
- Genie — 2024-08
- Usage or revenue as published
- 30% on the SWE-Bench coding benchmark (company claim) — 2024-08-13 — UKTN
- Rounds found
- 2024-08-13 — round — 2.5m USD (1.9m GBP) — Uphonest and SOMA Capital — Lakestar, Focal and others (already DEAL-SW-019; Lakestar and Focal new detail)
- Status now
- Active per existing record; no 2025–2026 page opened this round.
- Confidence
- single_source
Round 6 deep profile (30 Oct 2026), as the researchers wrote it; sources are listed in the record panel. Models and products (3)- Lumen Sovereign (Cosine) 2026-06-08 in training (target late 2026; commercial launch Q1 2027)Cosine's planned UK-trained frontier model, co-designed with 13 British banks, defence firms and others, to run inside customers' own systems.
- Lumen models (Lumen Sovereign 256K, Lumen Scout, Lumen Outpost) 2026 in development (alpha planned 2026 Q4; commercial launch planned 2027 Q1)Cosine's own model family; Lumen Sovereign is a planned frontier model that organisations can run on their own infrastructure, even air-gapped.
- Cosine coding agent (CLI, Desktop and Cloud) no date released (product)Cosine's autonomous AI software engineer that works alongside human developers through a command line, desktop app and cloud.
| London (and San Francisco) | tech.eu/2024/08/12/uk-ai-startup-cosine-raises-2 · gov.uk/government/news/ai-firms-pioneering-drug- · tech.eu/2026/04/17/cosine-goes-from-benchmark-le · ycombinator.com/companies/cosine | one source |
| cubicCompanies | AI code-review service that checks pull requests, flags bugs and suggests fixes.AI code reviewKey facts Team size 6 (YC profile, 2026-10); says teams merge PRs 28% faster; users named in launch post: cal.com, n8n, Linux Foundation | London | ycombinator.com/companies/cubic | one source |
| Fern LabsCompanies | Built a platform where networks of AI agents write, test and improve software; bought by Poolside in 2025. acquired | | airstreet.com/portfolio · press.airstreet.com/p/2025-review | one source |
| Gecko SecurityCompanies | AI tool that finds, verifies and fixes security flaws in application code.AI code security testingKey facts Team size 2 (YC profile, 2026-10); says 30+ CVEs found in projects incl. Ollama, Gradio, Ragflow | London | ycombinator.com/companies/gecko-security | one source |
| HelixDBCompanies | Open-source database that combines graph and vector search so AI agents can store and recall context.graph-vector databaseKey facts Team size 6 (YC profile, 2026-10); YC Spring 2025 batch; GitHub HelixDB/helix-db | London | ycombinator.com/companies/helixdb | one source |
| InthCompanies | Scans pull requests, code and websites for privacy problems and turns them into fixes; makes open-source consent library c15t.privacy code scanningKey facts Team size 3 (YC profile, 2026-10); YC Spring 2026 batch | London | ycombinator.com/companies/inth | one source |
| Lovable (UK base)Companies | Makes a service that lets people build websites and software apps by describing them in plain English.AI app builders | Second Home, 68 Hanbury Street, London (E1 5JL) | Companies House · lovable.dev/careers/london-workplace-manager-2c0 · find-and-update.company-information.service.gov. · find-and-update.company-information.service.gov. · find-and-update.company-information.service.gov. | verified |
| Malted AICompanies · also on Labs | Makes small, task-specific AI language models for businesses by distilling the outputs of large models.developer toolsProfile- Founded
- 2023 (UKTN)
- Founders
- Iain Mackie — co-founder and CEO
- Chief executive
- Iain Mackie — from 2023
- Hq
- Edinburgh (Scotland)
- What it does
- A "distillation" platform that turns the output of large language models into smaller, tailored AI models for a firm's own tasks, which it says cost less to run.
- Products
- distillation platform for small, task-specific language models — 2024
- Customers named
- null ("piloting its small language models with financial and legal firms", 2024-05)
- Rounds found
- 2023 — Pre-seed — 1m GBP — Creator Fund — null; 2024-05-15 — Seed — 6m GBP — Hoxton Ventures — Creator Fund, angels (already DEAL-LB-124 / DEAL-RG-001)
- Status now
- Active per existing record; no 2025–2026 page opened this round.
- Confidence
- single_source
- Founded (Labs Round 8)
- 2023 (founders met at the University of Glasgow in 2019)
- Founders (Labs Round 8)
- Iain Mackie — founder and CEO; Carlos Gemmell — founder and Chief Scientist; Federico Rossetto — founder and Chief Architect
- Chief scientist or research lead
- Carlos Gemmell — Chief Scientist
- Other leaders
- Ewen Fleming — Chief Commercial Officer; Sandy Nairn — Chairman; Matt Davies — Head of Engineering; Rachel Young — Head of Operations; Jack Merriman — Head of Forward Deployment; Jim Croft — Head of SRE
- What it does (Labs Round 8)
- Malted builds small, specialised language models by distillation for financial services. Its platform analyses every customer call, chat and email at banks, building societies and wealth managers to find signals about customer outcomes and to give evidence to regulators (Consumer Duty).
- Research focus
- Small language models for specific tasks and proprietary distillation methods; information retrieval, conversational AI, reasoning with external tools.
- Models and products
- Malted platform — analysis of 100% of customer interactions — not stated; Pulse — product named in a customer testimonial — not stated; specialised small language models — built by distillation — not stated
- Customers or partners named
- Scottish Building Society — customer testimonial (Paul Denton, CEO) — not stated — https://malted.ai/; Skipton Building Society — customer testimonial — not stated — https://malted.ai/; Openwork — customer testimonial (Rob Barker, CEO) — not stated — https://malted.ai/
- Funding total as published
- Not stated (company page: £1m raised in 2023, £6m in 2024)
- Rounds found (Labs Round 8)
- 2023 — first round — £1m — not stated — not stated; 15 May 2024 — seed — £6m — Hoxton Ventures (already DEAL-LB-124 / DEAL-RG-001 / DEAL-LAB-2016)
- Awards and programmes
- Sequoia F100 Rising Star (date not stated); Tech Nation Future Fifty (date not stated); founders' Amazon Alexa Prize challenge win (2021)
- Status now (Labs Round 8)
- Trading; sells specialised AI to UK banks and building societies, with named customers.
Labs Round 7 and Labs Round 8 deep profile (30–31 Oct 2026), as the researchers wrote it; confidence: one source. Sources - malted.ai/company
- malted.ai/
Models and products (1)- Malted Platform (specialised small language models) — (launch date not stated) live (product)Malted AI's system that uses small, specialised language models to analyse customer calls, chats and emails for financial services.
| Edinburgh | Companies House · uktech.news/ai/malted-ai-funding-20240515 · find-and-update.company-information.service.gov. · find-and-update.company-information.service.gov. · technation.io/unveils-latest-cohort-of-tech-scal | verified |
| Mindset AICompanies | Platform that lets software companies embed AI agents into their own products.developer tools | London (E1 5JL ) | Companies House · uktech.news/ai/embedded-agent-startup-mindset-ai · find-and-update.company-information.service.gov. · find-and-update.company-information.service.gov. | verified |
| NiaCompanies | AI assistant for software engineers that they can query through an API, Slack or the Cursor editor.developer tools | London (founder's base per source) | uktech.news/ai/ai-startup-founded-by-18-year-old | one source |
| PEAK:AIOCompanies | Manchester company making fast data-storage software for AI workloads.developer tools | Manchester | businesscloud.co.uk/live-blog/manchester-ai-soft · scan.co.uk/info/presszone/scan/nvidia/dgx-ready · businesscloud.co.uk/news/manchesters-peak-aio-to | one source |
| PhoebeCompanies | AI agents that watch live software systems, diagnose problems as they appear and propose code fixes.developer toolsProfile- Founders
- Matt Henderson — co-founder (former CEO of Stripe Europe); James Summerfield — co-founder (former chief innovation officer of Stripe Europe); the pair sold their first start-up, Rangespan, to Google in 2014
- Hq
- London (England: London)
- What it does
- AI agents that act as an "immune system" for software: they watch live system data, diagnose faults and propose code and infrastructure changes to fix them.
- Products
- Phoebe platform (public launch) — 2025-08-20
- Customers named
- Trainline (early access customer) — https://www.uktech.news/ai/phoebe-funding-google-ventures-20250820
- Rounds found
- 2025-08-20 — round (type not stated) — 17m USD (12.6m GBP) — Google Ventures and Cherry Ventures (co-leads) — null (already DEAL-LC-035)
- Status now
- Active per existing record; no 2026 page opened this round.
- Confidence
- single_source
Round 6 deep profile (30 Oct 2026), as the researchers wrote it; sources are listed in the record panel. | London | uktech.news/ai/phoebe-funding-google-ventures-20 | one source |
| PydanticCompanies | Maintains Pydantic, free software that checks data in Python programs, and sells Logfire, a tool that shows developers how their software and AI apps are running.developer toolsProfile- Legal name
- Pydantic Services Inc. (US entity named by UKTN; UK company per existing record)
- Founded
- 2017 (open-source library created); company emerged from stealth 2023-02
- Founders
- Samuel Colvin — creator and founder
- Hq
- London (England: London) — UKTN gives Colvin as "London-based"
- What it does
- Maintains Pydantic, a widely used open-source Python library that checks data matches expected types, and builds paid cloud services and developer tools on top of it.
- Products
- Pydantic (open-source data validation library) — 2017; cloud services with free tier and usage-based pricing — planned 2023
- Customers named
- Microsoft, Amazon, Apple, Meta (users of the library) — https://www.uktech.news/cloud/pydantic-sequoia-20230217
- Usage or revenue as published
- "around 48 million downloads a month" — 2023-02-17 — https://www.uktech.news/cloud/pydantic-sequoia-20230217
- Rounds found
- 2023-02-17 — Seed — 4.7m USD (3.9m GBP) — Sequoia — Partech, Irregular Expressions, angels; 2024-10-01 — Series A — 12.5m USD — Sequoia (already DEAL-SW-020)
- Open source
- Pydantic — about 48 million downloads a month — 2023-02
- Status now
- Active per existing record; no 2025–2026 page opened this round.
- Confidence
- single_source
Round 6 deep profile (30 Oct 2026), as the researchers wrote it; sources are listed in the record panel. | London (SW8 5EL) | Companies House · techcrunch.com/2024/10/01/sequoia-backs-pydantic · find-and-update.company-information.service.gov. · pydantic.dev/articles/pydantic-validation-10-bil · uktech.news/cloud/pydantic-sequoia-20230217 | verified |
| RevEng.AICompanies | UK start-up building foundation models to secure software supply chains; picked for Google's first Gemini Founders Forum cohort.software supply-chain security modelsKey facts Gemini Founders Forum first cohort, 53 companies (2025-10-14) | | blog.google/company-news/outreach-and-initiative | one source |
| SnykCompanies · also on Safety | Developer-security platform registered in England and Wales; now sells security tools for AI coding assistants and AI agents.AI code and agent securityKey facts 4,800+ customers (2026-03); Snyk Studio in 300+ enterprises (2026-03); 500+ Evo scans in early access (2026-03); bought Invariant Labs (ETH Zurich spin-off) 2025-06-24 | Boston (press dateline) | snyk.io/news/snyk-acquires-invariant-labs-to-acc · snyk.io/news/snyk-launches-agent-security-soluti | one source |
| SolveAICompanies | Makes a no-code platform on which businesses describe the software they need and AI builds it, linked to their existing systems.AI app buildersProfile- Founded
- 2025 (UKTN)
- Founders
- Steve Basher — founder (former Palantir engineer)
- Hq
- London (England: London)
- What it does
- A no-code platform that lets staff in large organisations build their own business software, connected to older systems and within governance rules.
- Products
- no-code enterprise app-building platform — 2025
- Funding total as published
- null (two rounds disclosed: 5m USD seed, 45m USD Series A)
- Rounds found
- 2026-02-26 (disclosed) — Seed — 5m USD (3.7m GBP) — Accel — null (already DEAL-SW-039); 2026-02-26 — Series A — 45m USD (33.3m GBP) — Google Ventures — Northzone, Mantic VC, NeverLift, angels (already DEAL-SW-038; other investors new detail)
- Status now
- Active; London no-code platform that disclosed 50m USD across seed and Series A in February 2026.
- Confidence
- single_source
Round 6 deep profile (30 Oct 2026), as the researchers wrote it; sources are listed in the record panel. | London (EC4A 1JP) | Companies House · uktech.news/ai/google-ventures-leads-solveais-33 · find-and-update.company-information.service.gov. · find-and-update.company-information.service.gov. | verified |
| Source.devCompanies | Developer platform that simplifies building and updating software for smart devices; chosen for Google's AI First UK accelerator. | London (—) | cloud.google.com/blog/topics/startups/graduating · seedcamp.com/our-companies/ | verified |
| SparklesCompanies | Lets anyone in a team start coding agents (Claude Code, Codex, OpenCode) on the company's GitHub code; each run ends as a pull request.team coding agentsKey facts Team size 2 (YC profile, 2026-10); YC Winter 2026 batch | London | ycombinator.com/companies/sparkles | one source |
| TesslCompanies | Makes a platform that gives AI coding agents structured, versioned instructions so software teams can build and maintain code with them.coding agentsProfile- Legal name
- Tessl AI Ltd (site footer)
- Founded
- 2024 (UKTN: Podjarny launched Tessl in February 2024)
- Founders
- Guy Podjarny — founder and CEO (previously founded Snyk; former CTO at Akamai)
- Chief executive
- Guy Podjarny — from 2024
- Other leaders
- Simon Maple — Head of Developer Relations
- Hq
- London (England: London) — registered office printed as 210 Pentonville Road, London
- Other offices
- null (runs AI Native DevCon events in New York; no New York office stated)
- What it does
- Tools for "spec-driven" software development, where people write specifications and AI coding agents write the code. Its registry holds specifications and evaluated "skills" that tell agents how to use libraries correctly.
- Products
- Spec Registry (10,000+ pre-built specs, open beta, free) — announced 2025-09-16, launch post 2025-09-23; Tessl Framework (specs kept in the codebase as agents' "long-term memory"; closed beta) — announced 2025-09-16; Skills on Tessl, "the package manager for agent skills", with evaluations for over 2,000 skills — 2026-01-29
- Usage or revenue as published
- "more than 10,000 pre-built specs" — 2025-09-23 — https://tessl.io/blog/tessl-launches-spec-driven-framework-and-registry; review evaluations for "over 2,000 skills" — 2026-01-29 — https://tessl.io/blog/skills-are-software-and-they-need-a-lifecycle-introducing-skills-on-tessl
- Funding total as published
- 125m USD — as of 2024-11-14 — https://tessl.io/blog/announcing-our-series-a-for-ai-native-software-development/; https://www.uktech.news/tech-hubs/snyk-founder-guy-podjarny-raises-125m-for-ai-software-development-platform-tessl-20241114
- Valuation reported
- 750m USD ("up to") — 2024-11-14 — UKTN only — single_source
- Rounds found
- 2024-04 — Seed — 25m USD — boldstart ventures and GV — null (already DEAL-SW-009); 2024-11-14 — Series A — 100m USD — Index Ventures — Accel (already DEAL-SW-008; Accel is new detail)
- Status now
- Active; London-based maker of spec-driven development tools and an agent-skills registry, led by founder Guy Podjarny.
- Confidence
- verified (funding total on primary and trade pages); valuation single_source
Round 6 deep profile (30 Oct 2026), as the researchers wrote it; sources are listed in the record panel. | 210 Pentonville Road, London (N1 9JY) | Companies House · tessl.io/about · uktech.news/tech-hubs/snyk-founder-guy-podjarny- · find-and-update.company-information.service.gov. · snyk.io/blog/snyk-tessl-partnership/ | verified |
| Trigger.devCompanies | Developer platform, tagged open source by Y Combinator, for building and running managed AI agents and workflows. | London (—) | ycombinator.com/companies/trigger-dev | one source |
| TurinTechCompanies | UCL spin-out whose Artemis platform uses evolutionary AI to optimise and check enterprise code.AI code optimisationKey facts $20m total raised (2025-03); Intel uses Artemis internally (2025-10); Artemis launched at NVIDIA GTC (2025-03-18); Artemis developer preview (2025-12) | London | turintech.ai/news/turintech-reveals-20m-in-backi · uktech.news/news/founder-interviews/turintech-fo | one source |
| UndoCompanies | Cambridge software that records a program's full run so AI coding agents can find the cause of bugs.developer toolsProfile- Founders
- Greg Law — founder and CEO
- Chief executive
- Greg Law — from null
- Hq
- Cambridge (England: East of England)
- Other offices
- null (plans to grow teams across the US and Europe)
- What it does
- Records the full execution history of a running program so that developers, and now AI coding agents, can replay it and find the root cause of software bugs.
- Products
- time-travel debugging and execution recordings for AI agents — date null
- Rounds found
- 2026-06-16 — round — 37m USD (27.6m GBP) — Elsewhere Partners — null (already DEAL-LC-099)
- Status now
- Active; Cambridge debugging company that raised 37m USD in June 2026 to serve AI coding agents.
- Confidence
- single_source
Round 6 deep profile (30 Oct 2026), as the researchers wrote it; sources are listed in the record panel. | Cambridge (CB1 3NA) | Companies House · uktech.news/ai/undo-raises-27-6m-to-boost-softwa · find-and-update.company-information.service.gov. · find-and-update.company-information.service.gov. | verified |
| Vibe Kanban (formerly bloop)Companies | Tool for planning and reviewing code written by coding agents such as Claude Code and Codex; formerly the code-search start-up bloop.coding-agent orchestrationKey facts Team size 10 (YC profile, 2026-10); YC Summer 2021 batch; GitHub bloopai | London | ycombinator.com/companies/vibe-kanban | one source |