Rank Company Location Year end Annual sales rise over 3 years Latest sales £000s Staff Comment
1 RAW CommunicationsVideo streaming provider Central London 2000 421.57% 3,037 49 Supplies online video presentations to the world's top fund managers
2 AttendaIT services provider West London 2000 377.27% 2,761 120 Fixed BBC's overloaded website when it went down on September 11
3 Cramer SystemsTelecoms software developer Bath 2000 258.64% 6,219 131 Engineer simplifies telecoms technology for BT and C&W
4 Wireless Information NetworkWireless services provider Buckinghamshire 2000 245.17% 2,333 25 Ran UK's biggest text-messaging service for The Sun newspaper in 2000
5 Green CathedralDigital media agency Cambridge 2000 239.50% 2,092 27 Kitchen-table start-up develops websites for dance band Faithless and FT
6 JacobsRimellTelecoms software developer Central London 2000 224.97% 7,294 40 IT engineers resigned from Reuters to start own business
7 Boiler Management SystemsPowerstation systems developer Sheffield 2000 207.06% 1,183 5 Founder laid off on day before wedding develops sensor for power stations
8 Victoria RealInteractive media producer Brighton 2000 205.60% 6,662 80 Designed Big Brother's website, which reported 745m hits in 10 weeks
9 EnsoftNetwork software developer Hertfordshire 2000 196.17% 2,023 20 90% of current sales derive from Cisco contracts
10 Telecom OneTelecoms network provider Central London 2000 185.74% 19,965 24 Telecoms company also runs a digital TV dating agency
11 GoJobsiteInternet recruitment publisher Hampshire 2000 173.75% †6,926 140 Conceived by three brothers on ski chairlift in Norway
12 EntranetDigital media agency Reading 2000 157.56% 8,330 96 Claims to have designed UK's first online car insurance website
13 DemicaBanking software developer Central London 2000 151.50% 2,291 50 Banker started company as a part-time project
14 FormfillElectronic form integrator Blackburn 2000 150.95% 1,594 15 Software makes form-filling obsolete with electronic transfer of data
15 Oyster PartnersDigital media agency Central London 2000 149.94% 10,482 137 Company bought out for £1 in 1995 now has £10.5m sales
16 Olympus AutomationIndustrial software developer Lincolnshire 2000 145.36% 1,258 15 Streamlines production processes for the likes of Northern Foods
17 Mutant TechnologyFinancial website developer Central London 2000 141.48% 3,023 35 Former investment banker spins off two further internet businesses
18 MultiJacDigital media agency Central London 2000 139.48% 1,353 20 Husband and wife make web-based games for HSBC and Ford Racing
19 Netwise SystemsComputer network integrator Surrey 2000 138.19% 7,400 15 Integrates IT systems at UBS Warburg
20 Sutherland ConsultingFinancial IT integrator Central London 2000 135.71% †3,911 35 Scottish founder only recruits former City colleagues
21 Eclipse InternetInternet service provider Exeter 2000 133.09% 1,418 23 Works in SW England for Devon County Council and Brittany Ferries
22 Sports InteractiveComputer game developer North London 2000 129.15% 1,475 10 1,500 unpaid fans contribute to PC football management game
23 Internet Pro VideoVideo-editing software developer Cambridge 2000 124.40% 1,715 25 Cambridge professor designs world standard video editing technology
24 OST Business RulesFinancial software developer Central London 2000 121.48% 5,059 41 Employs 30 software developers in Poland
25 Boke + WalterfangPower systems developer Essex 2000 118.78% 2,260 28 Former military-electronics expert starts telecom power-supply company
26 CDC SolutionsDocumentation software developer Wiltshire 2000 118.47% 3,017 41 Has raised three rounds of venture capital, totalling £19m
27 Amaze3D software developer Liverpool 2000 114.90% 3,498 94 Cervical smear training CD-Rom beats Microsoft in multimedia awards
28 Princeton ConsultingIT systems integrator Slough 2000 111.25% 3,151 65 Pulled planned £50m float on London Stock Exchange last year
29 LeisuredataPub software developer Somerset 2000 111.00% 1,889 15 Husband and wife design software to monitor pub fruit machines
30 Virtual Health NetworkDrugs database developer Surrey 2000 110.49% 1,106 15 Provides online database of new drugs for doctors and pharmacists
31 Buzz NetworksTelecommunication systems provider Central London 2000 107.89% 2,037 14 Former mobile-phone salesmen develop software to reroute calls
32 TiogaElectronics design subcontractor Derbyshire 2000 106.45% 5,691 26 Video equipment used everywhere from Alton Towers to Paramount Studios
33 UPDATAShare trading software developer Central London 2000 104.99% 1,604 20 Claims its trading platform is 10 times cheaper than Reuters or Bloomberg
34 Spektra GroupE-business software developer Livingston 2000 104.17% 3,752 37 Website developer founded out of MBO from Swiss lift manufacturer
35 OxagenGenetics researcher Oxfordshire 2000 102.69% 2,132 68 Uses family genetic profiling to help develop drugs for major diseases
36 MessageLabs GroupManaged technology provider Gloucestershire 2000 101.65% 6,570 118 Begun in a barn, it spun off a firm that makes software for filtering out porn
37 CellTrackerTelecoms software developer Bedfordshire 2000 100.65% 1,013 15 Develops database for tracking mobile-phone masts for Nokia and Ericsson
38 iokoDigital media systems integrator York 2000 100.63% 8,199 130 BSkyB uses company's technology to power Video Lounge project
39 Alphatec SoftwarePayment software developer Milton Keynes 2000 97.84% 1,684 17 Helped NatWest and Royal Bank of Scotland merge their IT systems
40 Imagine GraphicsGraphics card developer St Albans 2000 97.66% 1,402 6 Helps develop giant plasma screens for airports and City trading desks
41 KW InternationalTrading software developer SW London 2000 97.42% 3,792 60 Energy consultants develop platform for trading electricity supplies
42 First WaterPolymer technology developer Wiltshire 2000 96.81% 2,673 35 Develops 'artificial skin' to speed up the healing of wounds
43 Quality PLUS ConsultingCall-centre software provider Flintshire 2000 93.68% 2,812 17 Founder sold his house to set up high-tech company over kebab shop
44 Dolphin DynamicsTravel software developer Central London 2000 93.67% 1,272 14 Developed holiday-booking software now used in 16 countries
45 AlchemetricsMarketing database developer Berkshire 2000 93.33% 3,378 55 Runs large databases with up to 60m names
46 ION ITSoftware developer High Wycombe 2000 91.21% 5,375 80 Chance meeting at airport gave birth to software business
47 Evolution ConsultingIT strategy consultancy Central London 2000 91.00% 4,558 57 Founders claim never to have advertised for business
48 NetKonect CommunicationsInternet service provider Hampshire 2000 90.87% 3,696 27 Founder borrowed £150,000 to set up company
49 ASC Computer SoftwareMedical software developer Bolton 2000 90.39% 2,409 44 National database of patients' prescriptions prevents wrong treatment
50 Scotland ElectronicsIndustrial systems developer Moray 2000 89.78% 1,474 37 Makes robust electronic kit for use in North Sea and the Arctic
51 VIS EntertainmentComputer games developer Dunfermline 2000 89.46% 2,588 40 Creates 'virtual horses' for TV gambling channel
52 Bromcom ComputersWireless communications developer South London 2000 88.49% 12,290 91 Developed electronic register to help catch truants in 700 British schools
53 EXiTelecoms services provider Cheshire 2000 86.45% 38,721 715 Irish founders employ 1,500 engineers from Manchester to Kuala Lumpur
54 GlobebyteIT systems integration Surrey 2000 85.09% 2,544 19 Founder who risked life savings now sells to IBM and Oracle
55 BluewaveWebsite designer Central London 2000 84.24% 3,591 61 Sold 20% stake to Danish giant Maersk in 2000
56 RealiseE-business software developer Edinburgh 2000 83.31% 1,243 25 Company's new internet software won Computing magazine award
57 Focal Point SystemsInternet software developer Marlborough 2000 82.78% 1,391 32 One of only six IT contractors to Defence Evaluation Research Agency
58 Strategic ThoughtRisk software developer West London 2000 82.63% 3,583 31 Former British army officer sells risk-management software to US military
59 Lost WaxInternet software developer Richmond 2000 80.13% 1,595 26 £5m from business angels used to develop software for online auctions
60 VistormManaged services provider Oxford 2000 78.58% 17,792 157 Founder sold prized motorbike collection to start IT business
61 Process Systems EnterpriseProcess software developer Central London 2000 77.95% 1,115 14 Academics develop mathematical modelling software for BP and Shell
62 SolsisIT systems integrator Reading 2000 77.77% 1,657 10 Former Hewlett-Packard engineers retain employer as key client
63 Intensive NetworksInternet service provider Wiltshire 2000 77.47% 1,010 10 Aeronautical engineer turns into internet service provider
64 Global BeachE-business software developer SW London 2000 76.41% 2,424 11 Developed ‘cyberpet’ MOPyfish with record-breaking 18m downloads
65 1st SoftwareIFA software developer Warwick 2000 75.31% 3,340 38 Sells its database systems to 20% of UK's independent financial advisers
66 Pregem ComputingScanning software developer Hampshire 2000 73.79% 1,212 24 Sells scanning software to banks and airlines
67 Sibelius SoftwareMusic software developer Cambridge 2000 73.28% 2,500 30 Oxbridge twins' software composed music for Captain Corelli's Mandolin
68 Epinet CommunicationsCommunications software developer Gloucestershire 2000 69.13% 1,318 14 Enables British Heart Foundation website to take donations online
69 Aircom InternationalTelecoms service provider Surrey 2000 68.71% 6,954 102 Mobile-phone giant Nokia took 40% stake in January 1999
70 Network DataFinancial database developer Surrey 2000 68.59% 5,647 85 Claims to offer 20,000 independent financial advisers online information
71 Data IntegrationIT systems integrator Central London 2000 68.19% 3,760 20 Provides IT services to Hampshire City Council and Warwick University
72 SirocomTelecoms services provider SW London 2000 66.89% 3,650 26 Company builds virtual private networks for First Choice Holidays and Bovis
73 Blitz GamesComputer games developer Warwickshire 2000 66.22% 3,758 86 Twin brothers write top computer games for Microsoft and Disney
74 SquareSumAccounting software developer North Yorkshire 2000 66.02% 3,942 43 Increased in value since £5m listing on OFEX in January 2000
75 Fairbridge CommunicationsIT systems integrator North Yorkshire 2000 64.85% 1,582 22 Built internet registration platform for Who Wants To Be a Millionaire?
76 The Message PadCall-centre systems developer Warwick 2000 64.15% 2,677 110 Company answers clients’ phone when their switchboards are overloaded
77 Point SourceFlexible laser developer Southampton 2000 64.09% 5,212 48 Sold wife's car to develop laser technology for Nikon and NASA
78 SearchspaceFinancial software developer Central London 2000 61.90% 2,829 110 Claims its software monitors $400 trillion worth of transactions each year
79 Information InternetTrading software developer Hertfordshire 2000 59.89% 1,783 40 Enables banks to make foreign-exchange transactions online
80 RespondCRM software developer Northamptonshire 2000 59.39% 2,723 52 Software monitors customer complaints for NHS and New York Yankees
81 ClinPhoneClinical trials processor Nottingham 2000 58.37% 4,845 55 Former doctors develop system to gather clinical drug trial data
82 PAV Data SystemsWireless technology developer Cumbria 2000 55.24% 4,156 46 Helps Formula One pit crews communicate with their cars
83 The SAS Business GroupIntranet integrator West Sussex 2000 54.48% 2,457 30 Company owns powerboat for employee days out and corporate hospitality
84 ASTRACBusiness software developer Warwick 2000 54.44% †3,549 15 Provides software in 18 countries to clients from Ford to Vatican University
85 Margolis Communication SystemsIT systems integrator Central London 2000 54.29% 2,673 54 Company began life as boardroom furniture maker in 1911
86 Data DiscoveriesCRM software developer Edinburgh 2000 53.30% 1,326 15 Founder set up database firm after seeing a skip full of returned nappies
87 Neruby Computing ServicesIT systems integrator Reading 2000 53.12% 1,265 10 Uses team of 60 programmers in India
88 Multiple Access CommunicationsMobile network consultancy Southampton 2000 53.09% 1,966 20 Southampton University professor helps build city mobile-phone networks
89 JobserveInternet recruitment publisher Essex 2000 52.28% 13,069 47 Posts details of 8,500 jobs every day and achieves 80% profit margins
90 Concept TelecomTelecoms services provider Nottingham 2000 51.99% 6,537 18 Helps Nokia and Sony develop and test new products
91 Blueprint Management SystemsComputer software services Central London 2000 51.66% 2,021 19 Helps BT, Citibank and London Tube get more from corporate databases
92 Redwood TelecommunicationsTelecoms integrator Central London 2000 51.62% 2,949 20 Staff spend one month a year in training
93 Evolution EuropeElectronic security integrator Buckinghamshire 2000 50.14% 2,590 25 Installs security systems for offices and university laboratories
94 NS OptimumIT systems integrator Warwickshire 2000 48.79% 6,399 40 Builds and manages IT networks for state and private schools
95 Software 2000Printer software developer Oxford 2000 48.37% 15,423 73 Licensing printer driver software earns profit margins of 67%
96 Strategic Systems SolutionsBanking software developer Liverpool 2000 47.49% 13,761 217 City founders exploit lower wages in Liverpool for software company
97 Technology Facility ManagementSystems integrator Oxfordshire 2000 47.04% 4,470 69 Joint venture provides booking system for 620 hotels in China
98 Systems for WindowsElectronic form developer Surrey 2000 46.71% 1,274 28 Survives dotcom bad debts to sell to BT and government departments
99 EutechnyxComputer games developer Gateshead 2000 43.81% 2,079 49 Driving games transform teenage brothers' business
100 BOOT ComputersTrading software developer Cheshire 2000 43.46% 1,102 15 Sells software to Abbey National's former online share-dealing service

* supplied by company  † annualised figure