Directory

RSM UK

Professional ServicesOtherBritish

RSM UK is the seventh-largest business advisory firm in the United Kingdom, providing audit, tax, and consulting services to middle-market businesses. The firm offers audit and assurance, risk advisory, outsourcing, tax, consulting, restructuring, transactions, and legal services to public, private, and not-for-profit organisations. It operates from 35 offices across the UK and is a member firm of RSM International.

Radiant

ScaleupAIBritish

Vertically integrated AI infrastructure company formed through the February 2026 merger of Brookfield's Radiant platform and Ori Industries, a GPU cloud provider founded in London in 2018. The combined entity offers GPU-as-a-service capacity across more than 20 data centres globally and targets sovereign governments, enterprises and telecommunications providers.

Ramen Club

CommunityOtherSaaSCoworkingBritish

Ramen Club is an East London founder community and coworking space for bootstrapped SaaS founders and indie hackers, based near Dalston Junction. Founded in 2019, it offers a physical coworking space (Ramen Space), a 400+ member Slack community, weekly demo days, expert mentorship, and workshops covering growth, AI, legal, and finance. Members range from pre-revenue founders to those generating significant monthly recurring revenue.

Ramp

ScaleupFinanceForeign

Make expense management easy with Ramp's spend management platform. Combine global corporate cards, travel, expenses and accounts payable to automate finance operations and improve efficiency.

Rank Ventures

VCOtherBritish

Backs core infrastructure technology companies from pre-seed to Series C, deploying £500,000 to £2 million cheques into fintech, AI/ML and enterprise software with defensible IP or deep domain expertise.

Ranworth Capital

VCOtherBritish

Ranworth Capital Limited is a UK-based private investment firm incorporated in 2012 that provides seed, venture, mezzanine, and expansion capital to small and medium enterprises across technology, healthcare, and business services sectors. The firm invests exclusively with its own proprietary funds and takes a tailored, non-traditional approach to financing. It participates in angel investment activities through platforms such as SyndicateRoom.

Rapyd

CorporateFinanceBritish

Global embedded fintech and payments-as-a-service platform enabling cross-border payments, payouts and card issuing for businesses worldwide.

Ravio

StartupSaaSBritish

Global tech companies trust Ravio for real-time total reward benchmarking, market trends, and compensation management.

Raw Ventures

VCMediaDeep TechForeign

Raw Group is a house of innovators. We back original ideas, disruptive companies, and exceptional individuals with evergreen capital, hands-on, AI-powered advisory, and talent development.

Reachdesk

StartupSaaSForeign

Send personalized gifts and branded swag globally with Reachdesk. Drive ROI, build relationships, and boost pipeline with one powerful platform.

Really Good Culture

StartupAIE-commerceBritish

Predictive retail intelligence. Modelling what will sell, before it is made.

Reapit

CorporateProptechBritish

Reapit estate agent software helps real estate and lettings agencies of all sizes to build relationships and grow their businesses. Trusted by thousands of estate agencies.

Reasoning Project

VCAICommunityBritish

When everyone can build, reasoning is the new scarcity.

Record OS

StartupFinanceAIBritish

London startup offering AI-powered UK self-assessment tax filing combined with mandatory review by a qualified accountant, targeting self-employed workers and landlords.

Recorded Future

CorporateCybersecurityForeign

Get real-time, actionable cyber threat intelligence with Recorded Future. Mitigate cyber risks, prioritize threats, and proactively secure your organization.

Recycleye

ScaleupAIClimateBritish

AI computer-vision and robotics platform for waste sorting; robotic picking arms (Recycleye Robotics) and vision systems identify and sort recyclables across 28+ material classes.

Redalpine

VCAIFinanceForeign

Redalpine is a Swiss-founded multi-stage venture capital firm that has invested in software and science-driven companies across Europe since 2006. The firm takes a distinctive approach with a team split equally between scientists and operators, focusing on artificial intelligence, energy transition, health, and food security, with over $1 billion in assets under management.

Reddit

CorporateMediaConsumerForeign

Reddit, Inc. is an American social news aggregation, content rating, and discussion platform founded in 2005 and headquartered in San Francisco. It hosts thousands of topic-specific communities (subreddits) and is one of the world's most visited websites, generating revenue primarily through advertising and data licensing. The company has been publicly traded on NYSE (RDDT) since March 2024 and had approximately 2,555 employees as of December 2025.

Redis

CorporateSaaSAIForeign

Developers love Redis. Unlock the full potential of the Redis database with Redis Enterprise and start building blazing fast apps.

Redseed

VCOtherBritish

Redseed is a venture capital firm founded in 2015 by tech entrepreneurs and early backers of Facebook

Redwood Founders

CommunityOtherIncubator / AcceleratorForeign

for the doers of tomorrow. a community and an incubator to take you from self-doubt to building real companies and products people want.

Reflection AI

StartupAIForeign

Make intelligence open and accessible to all

Refute

StartupCybersecurityDefenceBritish

AI-powered counter-disinformation platform that detects and responds to hostile influence operations and bot-driven narrative campaigns; backed by the UK National Security Strategic Investment Fund and used by government and commercial clients.