Ranking first on the list of the largest software companies in the UK by market cap is Endava PLC (NYSE: DAVA), a publicly listed British software development firm created in 2000 in London, United Kingdom. It offers digital transformation consulting, agile software development, and a range of automation solutions. Endava is made up of two founding companies: Concise, founded in 2000 in London, and Compudava, founded in 2000 in Chișinău, Moldova. The firms formally united to form the Endava Group.

The company has helped some of the biggest names in Payments, Financial Services, Telecommunications, Media, Technology, Consumer Products, Retail, Mobility, and Healthcare companies increase their ability to capitalize on new business models and market opportunities. It has helped customers power the rapid, ongoing transformation of their businesses by developing and delivering dynamic platforms and intelligent digital experiences.

Its agile, multi-disciplinary teams use next-generation technologies to give a combination of Product & Technology Strategy, Intelligent Experiences, and World Class Engineering to help their clients become more engaging, responsive, and efficient. Endava has 12,183 employees as of December 31, 2022, located near client locations in Australia, Austria, Canada, Denmark, Germany, Ireland, Netherlands, Singapore, Switzerland, United Arab Emirates, the United Kingdom, and the United States, as well as nearshore distribution centers in the European Union: Bulgaria, Croatia, Poland, Romania, and Slovenia; Central European Countries: Bosnia & Herzegovina, Moldova, North Macedonia, and Serbia.

Founded: 2000
Headquarters: London, United Kingdom
Website: https://endava.com/

Darktrace, founded in 2013 by mathematicians and cyber defense experts, is a global leader in cybersecurity AI, offering complete AI-powered solutions in its mission to free the world from cyber disruption. It safeguards over 8,100 customers against the world's most complex threats, such as ransomware, cloud, and SaaS attacks. The Darktrace AI Research Centre, situated in Cambridge, UK, has conducted research that has set new boundaries in cyber security, with technical advances supported by over 125 patents and pending applications. The company's European R&D center is in The Hague, Netherlands.

Darktrace's revolutionary Self-Learning AI enables customizable solutions unique to each customer based on continuous visibility into an organization's complete digital ecosystem. Darktrace is now working on a Cyber AI Loop, an industry-first set of cyber capabilities that can not only prevent, detect, respond to, and heal from cyber-attacks but will do it all at once. An always-on, feedback system with a deep, integrated knowledge of the company creates a virtuous cycle in which each capability strengthens and hardens the whole security ecosystem.

Its customers include government agencies, educational institutions, the media, organizations that provide critical infrastructure, and businesses of all sizes in every industry. Darktrace is headquartered in Cambridge, UK, and employs over 2,000 people in over 100 countries. TIME has named Darktrace one of the "Most Influential Companies" for 2021.

Founded: 2013
Headquarters: Cambridge, United Kingdom
Website: https://darktrace.com/

Micro Focus is the next name that is listed among the largest software companies in the UK by market cap. It is an enterprise software firm that supports the needs and challenges of technology. The company was established in 1976 and is headquartered in Newbury, UK. Its solutions assist enterprises in leveraging IT investments, enterprise applications, and emerging technologies to handle complex, fast-changing business requirements while safeguarding corporate data at all times.

It operates in the following regions: Micro Focus Product Portfolio and SUSE Product Portfolio. Host connectivity, identity, access and security, development and information technology operations management tools, and collaboration and networking are all part of the Micro Focus Product Portfolio. SUSE Product Portfolio offers and supports enterprise-grade Linux and open-source solutions.

Micro Focus helps customers run and transform their businesses by providing a comprehensive portfolio underpinned by a vast inventory of smart analytics. The company manages advanced infrastructure software assets to help enterprises maximize the value of their investments in IT infrastructure and business applications. Security, IT Operations Management, Application Delivery Management, Information Management and Governance, and Application Modernization and Connectivity are among its product offerings.

Founded: 1976

Headquarters: Newbury, United Kingdom

Website: https://www.microfocus.com/en-us/home

Kainos Group is a Belfast-based IT company with 15 locations in the United Kingdom (Kainos is headquartered in London, the UK), Ireland, continental Europe, and the United States that focuses on two business areas: digital service and workday practice. It employs over 1,700 people globally and operates on the simple idea of making life easier for its global clients through technology.

Digital Services involve the creation and maintenance of digital solutions for government and commercial customers across their entire life cycle. Workday Practice combines cloud-based software for Human Capital Management as well as Financial Management and Planning. The Digital Services segment generates most of the company's revenue.

It is proud of its pandemic-related projects in the UK, which have included helping the government with technology that facilitates self-isolation, home testing, and Covid 19 contact tracing. It is the first Northern Irish tech business to join the FTSE 100. It has also helped in the handling of financial payments to those in need, as well as the management of repatriation flights.

Founded: 1986
Headquarters: London, United Kingdom
Website: https://www.kainos.com/

Spirent's history stretches back to 1936 when Goodliffe Electric Supplies Ltd was founded with the goal of filling niches in the electrical and electronics industries and being highly responsive to the demands of its clients. With an innovative range of products and services, Spirent has developed to become a world leader in addressing the test, assurance, and automation problems of a new generation of technologies: 5G, SD-WAN, Cloud, Autonomous Vehicles, and beyond.

Spirent Communications plc is an international British telecommunications testing company located in Crawley, West Sussex, UK. It is a part of the FTSE 250 Index and is listed on the London Stock Exchange. The name Spirent is derived from the words "inspired innovation". Spirent is now the world's leading provider of automated network, cybersecurity, and positioning test and assurance solutions.

It serves customers in industries such as communications, transportation, government, defense, aerospace, financial services, healthcare, retail, and others. Its network, cybersecurity, and positioning experts work closely with customers to understand their requirements before developing solutions that cover the entire technology lifecycle, from lab to outdoor implementation.

Founded: 1986

Headquarters: Crawley, West Sussex, United Kingdom

Website: https://www.spirent.com/

Bytes Technology Group is a computer software reseller based in Leatherhead, Surrey, UK. The firm sells computer software, mostly Microsoft products, but also cloud storage, computer security, and computer asset management techniques. During the year ended 30 June 2019, it was the leading reseller of Microsoft's Azure cloud computing software product in the United Kingdom.

Bytes is one of the largest software companies in the UK by market cap and among the leading providers of software, security, and cloud services, with a 40-year track record. It makes technology sourcing, adoption, and management more effective and cost-effective across software, security, hardware, and cloud services. Because of its excellent partnerships with many of the world's leading software businesses, its specialized staff is able to bring cutting-edge technology to a diverse and embedded customer base. As a result, it has a long history of strong financial performance.

Bytes Software Services (BSS) and Phoenix Software (Phoenix) are two of the company's brands. Bytes Software Services' customer base includes both private and public sector customers, while Phoenix's concentration is primarily on public sector customers. Professional services, manufacturing, retail, central and local government, and technology, media, and telecommunications are among the industries supported by the company.

Founded: 1982
Headquarters: Leatherhead, Surrey, United Kingdom
Website: https://bytetechnology.co/

Genius Sports started as a betting data expert in London in 2001 and have since evolved to become one of the world's leading sports technology companies. It currently has over 1,800 employees spread across five continents, this includes its London HQ, sports data 'nerve center' in Sofia, its tech and support hubs in Vilnius, Medellin and Tallinn, and its growing product and commercial teams across the U.S.

Sports leagues and federations can use Genius Sports software. This technology, which is utilized by sports leagues all over the world, allows sports to capture, manage, and distribute data and statistics. Sports, for their part, grant Genius Sports the rights to commercialize their data and video content with sportsbooks, casinos and media companies. About 300 sportsbook companies, including FanDuel, Skybet, and Bet365, are among Genius Sports' betting partners. Genius Sports provides live data, odds, and streams from over 240,000 live sports events every year to sportsbooks.

In May 2019, Genius Sports announced a partnership with the NASCAR stock-car racing association to become the exclusive provider of NASCAR data to licensed sportsbooks worldwide. Genius Sports announced a partnership with the National Football League in April 2021 to serve as their exclusive distributor of live NFL data and analytics to bookmakers and media companies. Genius Sports replaced the NFL's former partner Sportradar in this multi-year partnership, which also includes the rights to distribute NFL streams and represent its sports betting advertising inventory.

Founded: 2001
Headquarters: London, United Kingdom
Website: https://geniussports.com/

VTEX offers a digital commerce platform as a service to enterprise brands and retailers. Customers may use its platform to execute their commerce strategy, such as developing online stores, integrating and managing orders across channels, and creating marketplaces to sell items from third-party suppliers.

It undertakes business in Brazil, Argentina, Chile, Colombia, France, Italy, Mexico, Peru, Portugal, Romania, Spain, the United Kingdom, and the United States. VTEX was established in 2000 and is headquartered in London, UK. Its modern commerce platform and deep commerce knowledge free brands from the constraints imposed by legacy systems. VTEX is trusted by major global companies such as Sony, Walmart, Whirlpool, Coca-Cola, Stanley Black & Decker, and Nestlé, as well as 3,400 active online stores in 38 countries, to accelerate and transform their commerce business.

The VTEX Commerce Platform is a modern MACH commerce architecture that incorporates a low-code development platform that simplifies and accelerates the delivery of headless commerce experiences. VTEX was rated a Visionary in Gartner's Magic Quadrant for Digital Commerce in 2020, as well as a Leader in the IDC MarketScape - Global B2C Digital Commerce Platforms 2020 Vendor Assessment.

Founded: 2000

Headquarters: London, United Kingdom

Website: https://vtex.com/us-en/

Exscientia plc is a pharma tech business that uses artificial intelligence to research, design and develop drugs. The firm provides an end-to-end AI and technology solution for target identification, drug candidate design, translational models, and patient selection. Moreover, the company focuses on small-molecule drug candidates. This platform helps with the development of candidate drug molecules as well as the delivery of medication therapy to patients through AI-guided assessment.

Exscientia's motivation is to find faster and smarter ways to discover new and better medications. It will enable people to live more healthy and more productive lives by actively applying AI to precision engineer medicines more quickly and efficiently. To address this challenge, it is reimagining drug discovery by combining cutting-edge AI techniques with experimental innovation to create a new set of drug discovery processes.

From its inception in 2012, the company has been at the forefront of the development of an entirely novel field known as pharma tech, which is at the intersection of sophisticated AI applications and complex drug discovery. It was the first business to automate drug design and the first to have an AI-designed molecule enter clinical trials. Being a full-stack AI drug discovery company, it focuses on AI design as well as precise data generation. Together, these improve the strength and integrity of integrated AI and machine learning systems.

Founded: 2012
Headquarters: Oxford, United Kingdom
Website: https://www.exscientia.ai/

End of the list of the largest software companies in the UK by market cap is Arqit Quantum Inc, a cybersecurity technology business established in 2017. The company offers a quantum encryption platform-as-a-service, which secures networked device communications links against attacks. QuantumCloud, the company's product, allows the device to download a lightweight software agent that creates keys in collaboration with another device.

Arqit's technology involves providing a lightweight software agent to end-point client devices or cloud machines in order to create zero-trust, computationally safe encryption keys. The proof of this capability was independently assured by the University of Surrey, a GCHQ Accredited Centre of Excellence for Cyber Security, and PA Consulting, as stated by Arqit in May 2022.

QuantumCloud is a scalable, policy-based system for safeguarding regional networks, mobile devices, IoT deployments, and blockchains. It is simple to set up and requires no infrastructure. QuantumCloud is able to develop unlimited volumes of keys in unlimited group sizes and control the secure entry and exit of a device in a group. The platform also solves the issues associated with traditional encryption techniques.

Founded: 2017
Headquarters: London, United Kingdom
Website: https://arqit.uk/