Rank Company Location Year end Annual sales rise over 3 years Latest sales £000s Staff Comment
1 PKR3D poker website operator Channel Islands Dec 09 356.44% 33,031 98 Founder was first person to receive OBE for services to computer gaming industry
2 MimecastEmail management services provider Central London Mar 10 173.14% 13,334 158 Has offices in South Africa, Dubai and America
3 Quickstart GlobalIT services provider Central London Dec 09 167.89% *7,369 657 One of the founders set up and sold four other technology companies
4 The Hut GroupOnline retailer Northwich Dec 09 161.92% *53,604 220 Raised £14m from investors earlier this year
5 Adconion Media GroupDigital advertising distributor Central London Dec 09 149.65% *90,561 266 Founder established an American technology company that was bought by Vivendi
6 Monumental GamesComputer games developer Nottingham Dec 09 146.31% 5,165 97 Develops the MotoGP motorcycle racing game
7 ShebangPoint-of-sale software developer Daventry Dec 09 136.58% *59,989 244 Recently won a deal to supply Asda’s mobile-phone outlets
8 Forward Internet GroupMedia developer and investor Central London Dec 09 120.04% †50,808 46 Company generates 25% of its revenue in America
9 GPEGLCD display developer South London Feb 10 119.92% *6,289 11 Its waterproof electronic displays can be found in the bathrooms of luxury hotels
10 SciemusRisk-analysis software developer Central London Mar 09 118.46% 6,032 9 Its technology helps house insurers calculate the risk of flooding and high winds
11 DatanomicData management software developer Cambridge Dec 09 114.59% 5,178 42 Says it won 40 of its 160 customers in the past 12 months
12 SkrillOnline payment provider Central London Dec 09 108.18% 43,021 317 Its technology can process payments in 40 different currencies
13 ComtactManaged services provider Central London Dec 09 105.78% *5,120 35 Founder remortgaged his flat and sold his car to raise funds to start the business
14 Media IngenuityOnline lead generator Central London Dec 09 99.92% *6,571 26 Plans to launch a range of financial products under its Fluid.co.uk brand
15 365 iTechnologyIT services provider Basingstoke Dec 09 96.22% 7,979 53 Has made four acquisitions since 2007
16 Fourth HospitalityHospitality software developer Central London Aug 09 96.09% 8,438 118 Acquired recipe and menu management software company Star Logic this year
17 EndavaIT services provider Central London Jun 09 95.29% 20,433 520 Says its customers include five of the world’s ten largest banks
18 Kaspersky LabInternet security software London/Moscow Dec 09 93.39% 210,466 1216 Sponsored the Commonwealth Antarctic Expedition that ended in January
19 Reach-DataSMS services provider North London Dec 09 89.14% 9,932 6 Claims it partners with most of the leading British mobile-phone operators
20 Content and CodeSoftware consultancy Central London Dec 09 88.97% 6,433 82 Says it gained nearly a third of its 300-strong customer base in the past year
21 SkyscannerTravel search engine Edinburgh May 10 86.61% *8,806 77 Claims 10m people visit its website every month
22 PerformSports media provider South London Dec 09 85.63% *48,354 317 Claims it broadcasts more than 17,000 live sporting events online each year
23 Prism PowerPower systems manufacturer Watford Dec 09 85.34% *16,031 42 Chairman Keith Hall spent 26 years building switchgear before founding the firm
24 GreenlightDigital marketing agency Central London Aug 09 79.77% 15,702 64 Claims to have more than 100 blue-chip clients in Britain, including Interflora
25 Wireless LogicWireless data services provider Buckinghamshire Apr 10 77.61% *8,162 16 Says it opens 200 new customer accounts a month
26 Comet SolutionsIT consultancy Bristol Mar 10 71.56% *6,810 20 Its software is used by BSkyB and Vodafone to improve their customer service
27 ClinTec InternationalClinical researcher Glasgow Dec 09 70.14% 11,379 119 Has offices in 40 countries, including in India, Dubai and Poland
28 QiCommTelecoms services provider Middlesex Sep 09 63.65% 69,075 56 Operates in Britain, Hong Kong, the Philippines and Sri Lanka
29 TouchLocalOnline marketer Central London Dec 09 62.59% *9,727 135 Claims 4m people visit its website every month
30 Traffic JunctionOnline and affiliate marketer Hertfordshire Mar 09 62.49% 10,218 40 Has benefited from growth in the use of search engines such as Google
31 bet365Online bookmaker Stoke-on-Trent Mar 10 62.20% *417,678 1836 Company’s website is available in 17 languages, including Hungarian and Slovakian
32 AcademiaEducational IT consultancy North London Jun 09 61.76% 5,444 21 Claims it supplies software to students at up to an 80% discount
33 MobicaSoftware engineer and tester Cheshire Dec 09 61.06% 6,709 165 Plans to expand into America in the near future
34 The FoundrySoftware developer Central London Dec 09 60.81% 6,808 54 Software was used to create digital-effect sequences on Avatar
35 JellyfishPaid search agency Reigate Dec 09 60.60% 16,917 55 Recently won a contract with Skype
36 ShazamContent recognition services Central London Jun 09 60.37% 7,336 53 Funded by the early backers of Amazon and Google
37 EpsilonTelecoms services provider Central London Dec 09 59.83% †11,097 40 Claims that more than 24 languages are spoken by its employees
38 Innocore GamingComputer hardware developer Newcastle upon Tyne Dec 09 59.52% 5,318 16 Develops hardware and software for slot machines in Las Vegas casinos
39 ROCSAP-based software developer Weybridge Sep 09 58.10% 13,403 103 Has subsidiaries on the Continent and in America
40 CelerityIT services provider Lancashire Dec 09 57.90% 25,054 22 Completed a £2m contract with a central government department this year
41 DediPowerManaged hosting provider Reading Sep 09 57.73% *5,487 44 Clients include Virgin, Sony and ITV
42 AdaptManaged services provider Central London Jun 09 57.55% 31,008 86 Claims it helps its clients make IT cost savings of more than 25%
43 SSLElectronics and software developer Bristol Mar 10 57.32% *20,404 130 Recently won a contract with TFL to implement a digital CCTV system
44 S3 InteractiveTechnology repairer Glasgow Mar 09 56.81% 8,271 55 Claims it repairs and resells more than 50,000 mobile phones a month
45 Node4Communications services provider Derby Mar 10 56.50% *7,251 31 Is currently constructing a 42,000 sq ft data centre
46 wewillbuyyourcar.comOnline car dealer Yorkshire Mar 10 56.21% 21,491 9 Says it buys 25 used cars a day for an average price of £7,500
47 IRIS SoftwareBusiness software developer Berkshire Apr 09 54.94% 119,204 1330 Claims that its software generates 2m pay slips a year for Britain’s workerss
48 The BunkerManaged services provider Kent Dec 09 53.50% 5,243 54 Its three data centres are housed in old military bunkers
49 UKFastInternet hosting provider Manchester Dec 09 53.10% *9,099 110 Is due to launch a hosting service called UKFast Blue later this year
50 ControlCircleIT services provider Central London Sep 09 52.53% 9,115 63 Secured £6m growth capital from Scottish Equity Partners in February
51 LOVEFILM.comOnline DVD rental provider West London Dec 09 52.11% *97,170 427 Claims to be the third-largest subscription entertainment business in Britain
52 NeossDental implants developer Harrogate Nov 09 51.33% 14,552 108 Its dental implant system uses less than 100 components while others use 2,000
53 KelwayIT services provider Central London Mar 10 50.59% *178,091 350 Chief executive Phil Doye founded the company at the age of 21
54 GamesysOnline gaming developer Central London Mar 09 50.54% 58,998 251 Launched Caesarsbingo.co.uk and Heartgames.co.uk this year
55 Micro NavSimulation systems developer Bournemouth Dec 09 50.39% *5,777 46 Founders are qualified air-traffic controllers and pilots
56 IntelliFloFinancial software developer Kingston upon Thames Dec 09 50.16% 5,928 57 Says it has a total customer base of 6,500 users from 850 firms
57 ValueworksE-commerce software developer Wigan Dec 09 49.87% *5,972 76 Claims it delivers total savings for its clients of more than £200m a year
58 TimicoConverged communications provider Nottinghamshire Dec 09 49.01% 21,904 133 Clients include BP, Honda and the Stroke Association
59 Cambridge Broadband NetworksWireless technology developer Cambridge Dec 09 48.95% *22,007 60 Has raised £45m from investors to date
60 Orange Information SystemsIT consultancy Central London Mar 10 48.18% *15,521 48 Has launched a division that focuses on consultancy services for its blue-chip clients
61 ProbrandIT reseller Birmingham Dec 09 45.87% 57,595 69 Launched a security division to help public-sector clients avoid fines for loss of data
62 Hostelbookers.comOnline accommodation booking agency London Dec 09 45.76% 8,268 77 Travellers in Stockholm can use its website to book a stay in a Boeing 747 cockpit
63 EssenceDigital marketing agency Central London Mar 10 45.74% *18,445 51 Clients include Google, Cancer Research and eBay
64 Mobile Interactive GroupMobile and digital technology provider Central London Apr 09 45.69% 67,952 92 Claims to have built the first iPad app for The Sun newspaper
65 ActurisSoftware services provider Central London Sep 09 45.21% 14,083 110 Currently looking to expand into mainland Europe
66 ActivInstinctAffiliate marketer Northwest London Aug 09 44.48% 5,447 36 Has diversified from selling cricket bats and exercise bikes to web marketing
67 XbridgeOnline insurance broker Central London Dec 09 44.10% 12,493 135 The company’s chief executive was previously managing director of Match.com
68 Nexus OncologyClinical researcher Edinburgh Apr 09 43.71% 7,165 96 Looking to expand into Russia and Spain
69 TechnoPhobiaWeb application software developer Sheffield Dec 09 43.36% 5,091 71 Currently planning to open an office in London
70 King.comGaming website operator Central London Dec 09 43.09% 38,154 85 Claims its gaming websites are available in ten languages and six currencies
71 Exponential-eNetwork services provider Central London Jan 10 42.96% 19,952 105 Clients include Sony BMG and Bet365
72 AdeptraManaged services provider Reading Dec 09 42.91% 20,546 116 Recently expanded into mainland Europe and Asia
73 Defaqto MediaFinancial software developer North London Mar 09 42.15% 8,298 117 Claims to have 30,000 financial products on its database
74 Elite TelecomTelecoms services provider Lancashire Jul 09 42.07% 14,612 167 Uses its own video conferencing services to minimise travel to meetings
75 Focus GroupTelecoms services provider East Sussex May 10 42.05% *8,900 33 Is telecoms partner for Twenty20 champions, Sussex County Cricket Club
76 Griffin InternetInternet service provider Derby Dec 09 42.03% 16,910 71 Recently launched a series of cloud computing, hosting and virtualisation services
77 ITRS GroupFinancial software developer Central London Mar 10 41.78% *17,093 70 Claims that many of the world’s leading financial institutions use its software
78 Tomorrow CommunicationsIT network provider Central London Jul 09 41.60% 8,850 69 Company’s three directors met while working at an IT services company
79 Listening CompanyCall-centre software provider West London Oct 09 41.46% 73,659 2621 Planning to double in size over the next three years
80 RedwebDigital agency Dorset Dec 09 41.33% 5,070 96 Customers include the Electoral Commission, HM Treasury and Eon
81 Thomsons Online BenefitsEmployee benefits software developer Central London Dec 09 40.75% *16,319 132 Recently won a large contract with Glaxo Smith Kline
82 JustGivingFundraising website Central London Dec 09 40.70% *11,116 66 Sir Steve Redgrave has raised £1.8m for his charity through its website
83 OB10E-invoicing system provider Central London Apr 10 40.66% *13,104 178 Says it signed up 14 new global customers in 2009
84 Worldwide GroupTelecoms services provider Peterborough Dec 09 40.48% *27,720 55 Claims to route more than 100m minutes of calls every month
85 OptaSports information provider Central London Jun 09 40.45% 6,497 116 Its database helps football clubs to identify and recruit new players
86 DatixHealthcare software developer Southwest London Apr 10 39.95% *8,105 36 Says that more than 60m patients are protected by its healthcare software
87 bluesourceIT consultancy Central London Sep 09 39.38% *6,820 70 Conducted an upgrade of the Conservative Party’s email system to improve security
88 Rule FinancialBusiness and IT consultancy Central London Dec 09 38.91% 27,340 209 Has offices in Barcelona, New York and Lodz in Poland
89 Entanet InternationalCommunications provider Telford Nov 09 37.97% 27,215 75 Company operates from a Chinese style purpose-built pagoda
90 Neural TechnologiesArtificial intelligence software developer Hampshire Mar 10 37.71% *10,832 95 Has offices in America, Brazil, Chile, Malaysia and Hong Kong
91 The CloudWireless broadband service provider St Albans Dec 09 37.51% 17,575 59 Provides wireless broadband wifi services to 12 European countries
92 toptable.comRestaurant reservation website Central London Jun 09 36.30% 6,631 62 Claims its website contains details of 5,000 eateries worldwide
93 2bmData centre designer Nottingham Jan 10 35.76% *7,975 18 Sponsors European Tour golfer Graeme Storm
94 CybitTelematics software developer Cambridgeshire Mar 09 35.73% 25,482 136 Delisted from the LSE with backing from Francisco Partners in January
95 SolarcenturySolar technology developer Central London Mar 10 35.55% 34,518 113 Claims to have created the first British street powered entirely by solar panels
96 Neverfail GroupBusiness software developer Berkshire Mar 10 35.40% *11,921 140 Says that 3,000 companies worldwide use its software
97 ExcelianIT consultancy Central London Dec 09 35.20% *13,318 202 Almost 50% of the company’s sales are generated overseas
98 Thunderhead.comCommunications software developer Northeast London Dec 09 35.07% 18,289 98 Has nine offices worldwide, including in Sydney, New York and California
99 MeetingZoneConference call provider Oxfordshire Mar 10 34.78% *9,872 65 Its technology allows people to share their computer screens with up to 200 others
100 Momondo GroupTravel search Central London Dec 09 34.73% *30,161 113 Features in this table for a record seventh consecutive year

* supplied by company  † annualised figure