Rank Company Location Year end Annual sales rise over 3 years Latest sales £000s Staff Comment
1 GamesysOnline gaming developer Central London 2005 301.48% 9,454 51 Claims to pay out more than £1m a day in prize money
2 ApertioMobile telecoms software developer Bristol 2005 299.50% 8,509 158 Raised £17m, the second largest British technology investment in 2005
3 PulsicSilicon chip software developer Bristol 2005 272.31% *3,009 29 Claims its automation software reduces chip design time by more than 90%
3 The Search WorksSearch engine advertiser Central London 2005 272.31% †18,576 53 Helps likes of Comet and Trinity Mirror boost their internet search rankings
5 RedtrayE-learning software developer Surrey 2005 253.19% 4,478 30 Acquiring three firms in two years helped sales grow more than tenfold
6 itmsoilGeotechnical monitoring services Sussex 2005 249.32% 4,637 58 Technology used in construction projects such as Heathrow's Terminal Five
7 Mobile FunOnline phone accessory retailer Birmingham 2005 237.83% 7,525 50 Founded by a graduate software engineer when he was only 21 years old
8 Vivo TechnologiesCommunication accessories provider West London 2005 204.30% 3,903 7 Integrates GPS technology into mounts for pocket PCs
9 AssimaE-learning software publisher Central London 2005 195.02% 5,669 85 Four years after foundation, company is interested in floating
10 LatitudeDigital marketing agency Central London 2005 191.42% †*18,748 52 Reports its clients spend £1m a month advertising on Google
11 Road AngelCar accessories developer Northamptonshire 2005 159.64% 17,105 29 Claims its technology helps reduce road accidents by up to 50%
12 ByBoxDelivery systems operator Oxfordshire 2005 155.98% *12,615 84 Delivers more than 3m parcels a year through its electronic boxes
13 BDP Media GroupLearning software developer Central London 2005 151.81% 11,014 48 Its online training courses tackle bullying in the workplace
14 Digital WindowOnline marketer East London 2005 137.30% 4,554 25 Founded with profits from a Madonna fan tour
15 LiquidlogicCollaborative software developer Leeds 2005 137.03% 3,451 33 Launched with proceeds from sale of co-founders' previous company
16 Red Gate SoftwareDatabase software developer Cambridge 2005 134.84% 4,340 31 Says its software has 200,000 users, half of whom are based in America
17 MiragoSearch software developer Hampshire 2005 134.02% 5,395 46 Claims to process more than a billion internet search requests a month
18 PacketExchangeTelecoms services provider Central London 2005 132.92% *5,692 38 Is expanding its high-security internet services to American clients
19 SatamaticsSatellite services provider Tewkesbury 2005 123.61% 6,663 31 Private security firms in Iraq use its satellite-based tracking devices
20 Volantis SystemsCommunication services provider Guildford 2005 119.88% *7,855 90 Has raised more than £15m in four investment rounds since foundation
21 OcadoOnline grocery retailer Hatfield 2005 118.80% 143,319 928 Delivers almost 3m hand-picked grocery items a week for Waitrose
22 MX TelecomWireless technology developer Chiswick 2005 118.43% *43,752 32 Its technology enabled fans to watch the World Cup on their mobile phones
23 Total PDAOnline multimedia retailer Glasgow 2005 118.20% 10,153 28 Supplies fleet tracking and navigation systems to customers
24 Open LogicPortal software developer Worcester 2005 117.37% 5,945 27 Software enables motorists to pay parking fines online
25 Adviva MediaOnline advertising consultancy SW London 2005 116.89% 6,483 16 Helps advertisers such as BSkyB and O2 to target customers online
26 Tao GroupMultimedia software developer Reading 2005 107.48% *4,860 59 Has twice won a BAFTA award for interactive music technology
27 alwaysONTelecoms service provider Reading 2005 100.89% †3,080 30 Raised £1.5m from Foresight Ventures in 2005
28 Picsel TechnologiesMobile software developer Glasgow 2005 100.35% *13,035 174 Claims that 35m mobile phones use its file-viewing technology
29 Green CathedralDigital media agency Cambridge 2005 95.36% 5,491 61 Develops websites for the Eden Project and Open University
30 CSW GroupHealthcare IT provider Oxford 2005 94.59% 6,052 117 Software may be used to replace patient records lost in Hurricane Katrina
31 DCG DatapointData-management services provider Surrey 2005 94.52% 5,120 25 Works with Harvey Nichols updating its daily store transactions
32 Thomsons Online BenefitsEmployee benefits software developer Central London 2005 94.01% *3,794 34 Helped the MoD launch an online pension calculator for 200,000 personnel
33 NucleusWeb designer Surrey 2005 92.80% 5,726 46 Founder designed album covers for The Who in the 1970s
34 Link HR SystemsHR software developer Chester 2005 92.43% *6,174 40 Software is used by the NHS to evaluate 900,000 employees’ pay
35 AppSenseSoftware developer Warrington 2005 90.92% 8,504 92 Says it protects over 2,500 organisations against rogue software
36 RadioscapeWireless software developer Central London 2005 89.10% 9,168 79 Has raised more than £30m from investors including Atlas Venture
37 WiggleOnline sports goods retailer Portsmouth 2005 85.23% 9,230 50 Claims 2,000 new customers use its website every week
38 BetfairOnline bookmaker West London 2005 82.05% 107,114 423 Says it processes more than 5m bets a day through its website
39 Marix Drug DevelopmentClinical drug developer South Wales 2005 81.81% 3,003 30 Runs a 30-bed clinical trials unit to help test Alzheimer's drugs
40 AdeptraManaged services provider Reading 2005 79.67% *4,489 45 Software makes 10m automatic calls a month on behalf of clients
41 VendaE-commerce software developer Central London 2005 79.16% 3,603 51 Manages e-commerce websites for retailers such as Virgin Megastores
42 I-playMobile games developer Central London 2005 76.88% 11,929 155 Owns franchise to mobile phone games for The Fast and the Furious and 24
43 LateRoomsOnline hotel agency Manchester 2005 76.03% 7,097 135 Says that 13,000 European hotels offer discounted rooms on its website
44 JobpartnersHR software developer West London 2005 74.76% 5,301 42 Claims Nike halved recruitment costs by using its software
45 TrigoldMortgage software developer West London 2005 74.07% *6,251 93 Software helps 24,000 financial advisers find the best loan deal for their clients
46 Box TelematicsWireless technology developer West Midlands 2005 72.15% 3,546 49 Its wireless boxes are used to monitor drinks consumption in pubs
47 Griffin InternetInternet service provider Derby 2005 68.52% 4,543 31 Claims to provide internet access to more than 50,000 subscribers
48 Quantum Research GroupTouch-button technology designer Southampton 2005 68.20% *4,047 29 Says Apple’s iPod success has increased demand for its sensor technology
49 LaganGovernment software developer Belfast 2005 67.80% 6,087 82 Claims to supply software to 130 government clients in Britain and America
50 SepuraRadio technology developer Cambridge 2005 67.61% 35,099 131 Its secure digital radios are used by emergency services worldwide
51 GigaSatSatellite systems manufacturer Hertfordshire 2005 67.25% 5,695 36 Its equipment enables troops to access the internet and talk to loved ones
52 IRISYSInfrared systems maker Northamptonshire 2005 67.22% *6,621 63 Says its technology supplies two-thirds of the world’s footfall monitoring firms
53 hSoIT services provider Central London 2005 66.03% 5,050 45 Its data-storage product is used by Endemol, the firm behind Big Brother
54 Digital VisionData capture consultancy Cheshire 2005 66.00% 3,265 37 Banks use its character-recognition software to extract data from documents
55 WDSGlobalWireless services support provider Poole 2005 65.86% 24,793 466 Claims 9m people access its wireless knowledge database each month
56 CheezeDigital marketing agency Ipswich 2005 65.54% 6,394 22 Is developing a directory tracking blogs and podcasts for advertisers
57 GammaTelecoms network operator Newbury 2005 64.78% 100,013 158 Its resellers supply telephony services to 400,000 homes and 50,000 businesses
58 Daisy CommunicationsTelecoms service provider Lancashire 2005 63.16% †*15,995 84 Has acquired five companies since 2005, plans to buy five more this year
59 Pole Star Space ApplicationsMaritime communications provider Central London 2005 62.82% 4,692 25 Former banker founded business after phone box shipment went missing
60 Sarian SystemsWireless router manufacturer Ilkley 2005 59.66% 3,290 21 The company's technology helps to power the Thai national lottery
61 IESASupply chain manager Warrington 2005 59.48% 18,844 105 Software helps manage the supply chain of clients such as Siemens
62 Albany SoftwareE-transactions software developer Hampshire 2005 59.20% 7,593 93 Set up in founder’s spare bedroom with a £30,000 loan
63 Mistral Internet GroupInternet service provider Brighton 2005 57.20% *19,702 90 Has acquired four companies in the past two years
64 Momondo GroupTravel search Central London 2005 57.18% 6,882 32 Claims to have referred £1 billion sales to the travel industry in 2005
65 ExasoftFinancial software developer Coventry 2005 57.09% 3,685 7 Won the Queen's Award for Enterprise in 2006
66 EdenbrookSystems integrator Central London 2005 56.30% 17,000 91 Acquisition of rival consultancy has added £1.4m to sales
67 Axiom SystemsTelecoms software developer Reading 2005 56.29% 10,435 67 Its software handles customer orders for internet service providers
68 VioDigital supply chain Central London 2005 56.21% 3,044 51 Software automatically resizes ads to different publishers' specifications
69 Zen InternetInternet services provider Rochdale 2005 56.16% 19,043 148 Broadband supplier says it has 65,000 clients
70 Fluency Voice TechnologySpeech recognition software developer West London 2005 56.15% 3,768 61 Its speech recognition technology handles hotel bookings for Travelodge
71 Bell MicrosystemsIT services provider Portsmouth 2005 53.30% *13,949 33 Claims its data storage networks saved one client £700,000 in three months
72 OneBill TelecomTelecoms service provider Worthing 2005 53.02% 20,900 63 Acquisition made earlier this year added 2,000 customers
73 BigHandDictation software developer Central London 2005 52.53% 5,365 45 Claims that over 400 law firms worldwide use its workflow software
74 SSLElectronics and software developer Bristol 2005 52.19% 3,730 80 Its equipment was installed on over 3,000 miles of British highways last year
75 HarloshInsurance software developer Cirencester 2005 51.48% 3,453 35 Set up an office in Australia and recently won first contract in New Zealand
76 Aircom InternationalTelecoms service provider Surrey 2005 51.35% 53,044 510 Claims it has doubled exports to £44m in the past three years
77 MultimapOnline map provider Central London 2005 49.62% *7,569 76 Says it is one of the 10 most visited websites in Britain
78 1EEnterprise software developer West London 2005 49.19% 5,778 42 Claims its software helped save a client 50,000 IT support hours
79 MarketpipeFinancial software developer Central London 2005 47.84% *3,428 28 Set up by City banker and now supplies software to 21 banks
80 Espresso EducationEducational content provider West London 2005 47.67% 4,305 52 Founded by former Blue Peter editor and Newsround producer
81 SolarcenturySolar technology developer Central London 2005 46.88% 6,019 40 Says it has designed the first solar roof tile for British homes
82 Capture ProjectsData-management software developer Leeds 2005 46.56% *3,472 28 Marconi uses its software to streamline its administration
83 ActixTelecoms software developer West London 2005 46.30% 26,063 184 Software is used by mobile phone companies in more than 60 countries
84 epyxE-trading platform developer Coventry 2005 45.25% 6,792 69 Says it processes £35m worth of invoice transactions every month
85 PrometheanEducational technology developer Blackburn 2005 44.53% *80,548 502 Children in 70 countries are taught using its interactive whiteboards
86 bet365Online bookmaker Stoke-on-Trent 2005 44.27% 604,803 769 Says it services more than 900,000 online punters in 120 countries
87 EquiinetServer appliances developer Swindon 2005 43.70% 4,472 19 Claims its technology reduces download times for 10,000 schools
88 Evolution StudiosVideo games developer Cheshire 2005 42.40% 5,803 83 Has supplied simulation software to train pilots in the Royal Air Force
89 ACISTransport software developer Buckinghamshire 2005 42.20% 14,856 114 Says its alert system is installed at 28,000 Yorkshire bus stops
90 Cerillion TechnologiesTelecoms software developer Central London 2005 41.79% 12,666 127 Formed from buyout of Logica's customer care and billing division
91 aquilaheywoodFinancial software developer Surrey 2005 41.63% 26,414 211 Software administers corporate pension schemes for clients including BT
92 Elite TelecomTelecoms services provider Lancashire 2005 41.56% *4,863 19 Tussauds, Kwik-Fit and Vision Express use its call handling software
93 Watford ElectronicsOnline electronics retailer Luton 2005 40.82% *48,232 140 Customers include PC users and big companies such as BT and British Gas
94 Pace TelecomTelecoms service provider Wrexham 2005 40.79% †4,407 40 Set up in a garage with £50 by a father and son
95 PractivInsurance software developer Guildford 2005 40.51% *8,548 51 Founder was only 22 when he set up the company
96 Power Panels Electrical SystemsElectrical assembly manufacturer West Midlands 2005 39.67% 12,147 161 Has produced 10,000 control systems for manufacturers worldwide
97 ComplinetCompliance software developer SW London 2005 39.05% 7,903 147 Claims over 1,000 firms and 15,000 subscribers use its software daily
98 Allpay.netElectronic payment provider Herefordshire 2005 38.56% 11,897 93 Says it currently processes 25m payment transactions a year
99 VectaSales software developer Oxford 2005 38.50% 3,865 49 Claims its software can increase clients’ sales by 20% in three months
100 Play.comOnline entertainment retailer Jersey 2005 38.14% †*155,479 500 Shipped over 2m products in busiest week last year

* supplied by company  † annualised figure