RankCompanyLocationYear endAnnual sales rise over 3 yearsLatest sales £000sStaffComment
1UKCloudCloud services providerFarnboroughMar 16262.66%32,05297Its platform powers online visa and driving licence applications for the government
2Roc TechnologiesIT services providerNewburyMar 16221.18%15,804151Has joint venture with academics from Oxford University to improve performance of IT projects
3LoveCraftsCrafts communities platformCentral LondonMar 16214.97%*10,88680With £18m of venture capital it has created a crafts community covering 140 countries
4ImmunocoreBiotechnology developerAbingdonSep 15206.64%14,305150Opened its first overseas office in October last year near Philadelphia
5SmarketsSports betting exchangeEast LondonDec 15205.90%*10,40041Says its staff set their own salaries and have an unlimited holiday allowance
6WorldRemitMoney transfer providerCentral LondonDec 15180.35%26,813198Founder came up with idea after paying excessive money transfer fees
7SemblantLiquid-repellent nano-coatings makerCambridgeshireDec 15172.77%*5,49613Claims its nano-coating technology is used to protect more than 100m mobile devices
8Funding CirclePeer-to-peer lendingCentral LondonDec 15155.39%*32,093320More than £1.3bn has reportedly been lent through its website to 15,000 businesses
9UNiDAYSStudent verification serviceNottinghamApr 16153.82%*11,385112Says its website and mobile app are used by 8.3m students worldwide
10Ve InteractiveEcommerce technology developerCentral LondonDec 15151.05%*33,783800Has raised more than £50m in funding from 500 investors
11RTX Routetrader ExchangeTelecoms trading platformCentral LondonNov 15148.25%†161,29629Its software is used by telecoms operators worldwide to buy and sell services
12ImpulsePayMobile payment technologyNewcastleDec 15148.09%*12,4658Virgin Trains uses this company's technology to charge customers for wi-fi access
136Point6IT consultancyCentral LondonFeb 16144.72%*7,19358Companies seek its expertise in the event of a cyber-attack
14Tantalum CorporationVehicle tracking technologyUxbridgeDec 15140.76%*16,084145Is helping to develop Samsung's car monitoring device
15RateSetterPeer-to-peer lendingEast LondonMar 16133.63%*18,458152Has enabled investors to lend more than £1bn to individuals and businesses
16VIRTUS Data CentresDatacentre services providerCentral LondonDec 15133.57%9,72635Owns and operates data centres in Enfield, Hayes and Slough
17Miura SystemsPayment hardware providerHigh WycombeDec 15129.31%24,81944Approximately 80% of revenues come from overseas sales
18FanDuelFantasy sports game developerEdinburghJun 15128.17%†37,485230Launched a football-based fantasy sports game in the UK in August
19CitNOWVideo software developerWokinghamDec 15126.62%*5,65369Has subscribers in 44 countries, who produce 500 hours of video every day
20VictorOnline private jet hireCentral LondonDec 15118.68%*16,47270Counts Sir Elton John among its investors
21FairsailCloud-based HR systemsReadingDec 15114.36%5,56762Sage invested £10m for a 21% stake in the business in May
22BBOXXSolar system manufacturerWest LondonDec 15113.74%*5,309199Aims to provide electricity to 20m people in developing countries by 2020
23CloudreachCloud services providerCentral LondonJul 16111.98%*47,691251Worked with the Met Office to develop the infrastructure for its Weather Cloud platform
24The Media ImageDigital marketing agencyWest LondonFeb 16111.26%*10,25623Its founder was Google UK's fifth employee
25BlisAdvertising technology providerCentral LondonDec 15109.76%*15,12997In March raised $25m from Endeit Capital, Beringea and Unilever Ventures
26PalringoMessaging and gaming platformEast LondonAug 15109.15%7,92455Has an office in Helsinki after acquiring a Finnish games developer
27RealityMineMarket research softwareManchesterDec 15108.87%*5,331100Says it tracks more than 3m smartphones to capture data about users' habits
28Fonix MobileMobile software developerCentral LondonJun 16106.80%*41,46820Helped the BBC's Children in Need campaign raise over £6.5m in mobile phone donations
29Redtail TelematicsVehicle tracking technologyCambridgeMar 16106.32%*8,72920Says its hardware takes 1,000 readings a second once installed in cars
30EburyBusiness finance providerCentral LondonApr 16106.26%*22,440350Has raised more than £70m from venture capital investors
31DigitaviaAudio-visual integratorSurreyAug 15104.19%7,28830Has installed audio-visual equipment for companies such as eBay and PayPal
32Epos NowPayment systems developerNorwichMay 16103.56%*9,180285Says its point-of-sale systems have processed more than 5bn transactions in 103 countries
33Focus Group EuropeIT consultancyCentral LondonDec 1598.35%*5,04943Helps Standard Life, Olswang and others implement IT systems for sales, finance and HR
34ESP GroupMass transit smartcardsHullJul 1596.25%67,727314Issues Oyster cards for London Underground as well as rail cards used nationally
35Junifer SystemsCustomer care softwareCentral LondonJul 1691.54%*5,54962Started by the co-founders of Calculus Solutions, which was sold for £50m
36ZopaPeer-to-peer lendingCentral LondonDec 1590.75%20,640111Has reportedly facilitated more than £1.6bn in peer-to-peer loans
37Performance HorizonMarketing software developerNewcastleDec 1589.87%*6,18181Says it connects 160,000 online marketers and affiliates in 183 countries
38SalecycleMarketing technology developerTyne and WearMar 1688.72%*8,956114Helps Ikea, Dyson, Virgin Atlantic and the like convert web visitors into customers
39Green Energy OptionsSmart home monitoringCambridgeMar 1686.98%*14,83560Has sold 3m devices to help people monitor and manage energy use in their homes
40ECS SecurityIT security servicesGlasgowDec 1586.14%*12,21477Its customers include three of the UK's five biggest banks
41TORI GlobalIT services providerCentral LondonMar 1685.58%*34,56152Helps financial institutions manage compliance and organisational change
42FarfetchDesigner fashion websiteCentral LondonDec 1585.07%*335,074500Allows shoppers to browse more than 400 international fashion boutiques online
43Bullitt GroupMobile phone designerReadingDec 1584.25%*64,112120Is developing a smartphone and other accessories for Land Rover
44Red BadgerSoftware developerEast LondonOct 1582.73%*5,65657Developed a mobile app for the Haller Foundation, pro bono, to help Kenyan farmers
45AdzunaJob search websiteWest LondonJun 1680.15%*5,55940Its ValueMyCV tool estimates jobseekers’ earning power
46PrivateFlyOnline private jet hireSt AlbansMay 1578.49%*10,23621Launched in 2008 with £2m, it now has more than 7,000 private jets on its booking system
47Ideal NetworksIT services providerBrightonDec 1577.66%*9,30346Manages and supports IT networks in 34 countries
48Managed 24/7IT services providerMilton KeynesSep 1576.79%*6,33444Uses predictive analytics to prevent IT & telecoms outages
49Trak GlobalVehicle tracking technologyCreweJun 1674.62%*13,30569Insurers such as More Th>n use its driving behaviour software to manage risk
50NeuvenStaff administration softwareManchesterJul 1574.23%60,25414Its software is used by companies that employ temporary labour
51LPW TechnologyMetal powder manufacturerCheshireAug 1573.09%*7,38036Its metal powders are used in 3D-printing of products such as turbine blades and dental implants
52Cloud Technology SolutionsCloud software developerManchesterMar 1672.38%*8,63934Has used its software to move nearly 12,000 companies in 20 countries onto Google Apps
53CommAgilityTelecoms electronics manufacturerLoughboroughSep 1570.98%*13,15645Provides the technology used for 4G phone networks and for research into 5G
54MDS TechnologiesCloud services consultancyWiltshireApr 1569.46%5,39340Director Phil Dawson co-founded UKCloud, the company at No 1
55FeefoCustomer review softwareHampshireMar 1668.07%*6,00884Collects consumer reviews for more than 3,000 clients such as the travel site Expedia
56Prepaid Financial ServicesPayment services providerCentral LondonDec 1567.15%28,81447Its prepaid cards are used by governments, multinational companies and individuals
57AnalogFolkDigital marketing agencyCentral LondonDec 1565.82%15,962125Launched its new data intelligence division, AnalogFolk DNA, in February
58DigitalboxAdvertising technology consultancyBathApr 1665.56%*8,65842Sold ContentClick, its ad platfom for bloggers, to the US ad network RevContent in January
59Exco InTouchMedical technology providerNottinghamApr 1663.42%*11,820102Says 26,000 hospitals and clinics use its technology to capture clinical trials data
60Qualasept PharmaxoPharmaceutical manufacturerWiltshireApr 1562.79%48,688119Claims it has developed the UK's single biggest aseptic clean room
61Green Man GamingDigital games retailerCentral LondonDec 1561.74%29,56060Has launched a publishing label to help bring new video games to the market
62Esprit DigitalDigital screen manufacturerStevenageDec 1558.56%*7,32711Created the digital advertising screens lining escalators in London Underground stations
63Lineup SystemsAdvertising technology developerWest LondonJun 1556.85%*5,40285Time Inc and News UK are two of this software company’s customers
64DufrainData consultancyEdinburghMay 1654.93%*8,465112Help banks store, process and understand customer data
65ZutoCar finance specialistCheshireFeb 1654.65%*23,094355Is looking to recruit an extra 70 members of staff before the end of the year
66ChargemasterElectric vehicle chargingLutonDec 1554.10%13,171130Is the official charging partner for Nissan’s electric cars in the UK
67Harlex ConsultingIT consultancyCentral LondonSep 1553.92%*5,13237Helps businesses such as Sony Music and G4S get more from their data
68Edge Testing SolutionsSoftware testingGlasgowDec 1553.30%9,31684Last year opened a facility where developers can test software for free
69MoblicitiMobile IT servicesSurreyMar 1653.22%*7,01020Helped roll out wi-fi across Nationwide Building Society’s 700 branches and offices
70PaymentsensePayment processing servicesCentral LondonMar 1652.93%*44,852203Helps more than 50,000 small businesses process credit card payments
71SkyscannerTravel search engineEdinburghDec 1552.92%119,715674Is featuring in Tech Track 100 for a seventh consecutive year
72Ndemic CreationsComputer games developerBristolMar 1652.61%*8,5828Says over 85m players worldwide have downloaded its Plague Inc game
73Breathing BuildingsSustainable ventilation developerCambridgeMar 1652.25%*7,80044Provided ventilation technology for Costa Coffee's ‘zero energy’ cafe in Telford
74WifinityInternet services providerSurreyAug 1552.23%5,52135Specialises in providing wi-fi to remote and hard-to-reach military sites
75Conveyancing Data ServicesConveyancing search softwareReadingMar 1651.75%*7,49563Three former colleagues invested just £1,500 to start this company in 2010
76JellyfishDigital marketing agencyCentral LondonMar 1650.87%*50,243304Acquired digital publishing software company MagazineCloner last year
77essensysCloud services providerCentral LondonJul 1550.76%11,72836Plans to open a second US office in California before the end of 2016
78Channel TelecomTelecoms service providerNorth LondonDec 1550.50%*10,29323Provides telecoms services to companies such as American Express and Gucci
79TestPlantSoftware testing toolsCentral LondonDec 1550.29%9,07567Recently opened its third US office in Philadelphia
80IT LabIT services providerCentral LondonMar 1649.49%31,118331Provides IT support to 3,000 workers at the sports car maker McLaren’s technology hub
81SpiraliteDuctwork manufacturerEssexJun 1549.30%9,42258Claims its patented product is up to 40% more energy-efficient than traditional metal ducts
82GBM DigitalIT consultancyManchesterDec 1548.96%*34,92040Helps schools deploy technology in the classroom
83Cloud DistributionCloud services providerReadingDec 1548.74%*13,23026Its partners include the American IT firms Aerohive and Check Point
84ActiveQuotePrice comparison websiteCardiffSep 1548.60%*5,850110Its technology is also used by other comparison sites such as Confused.com
85EdenhouseIT consultancyWarwickshireMar 1647.78%31,710195Says it has completed 800 SAP software projects to date
86CalastoneFund transaction networkCentral LondonDec 1547.28%*15,115109Automates investment fund transactions and processes across different platforms
87moneyPrice comparison websiteGloucestershireOct 1547.05%23,63843Says it attracts around 2.5m unique users to its website every month
88Hutchinson NetworksIT consultancyEdinburghDec 1546.98%*5,07960Provides customer support through a network of 3,000 engineers around the world
89ViastakIT services providerCentral LondonDec 1546.82%*6,38230Its iFollowOffice cloud desktop product took five years to develop
90LoveLiveVideo agency for musicCentral LondonDec 1546.77%*7,00155Its music video platform is used by The Guardian and Time Out
91GrapeshotAdvertising technology developerCambridgeDec 1546.67%*5,02075Plans to open offices in San Francisco, China and Japan after raising £6.6m in February
92POD PointElectric vehicle chargingCentral LondonJun 1546.47%6,41850Has sold more than 27,000 electric vehicle charging points
93iStoragePortable data storageMiddlesexJul 1546.38%5,72615Sells its encrypted data storage devices to the Ministry of Defence and Google
94CashflowsPayment services providerCambridgeDec 1546.14%19,90959Its in-house technology enables 1,500 businesses to accept card payments online
95M Squared LasersLaser designer and manufacturerGlasgowFeb 1645.82%*9,41475Its advanced laser systems are used by Nobel prize-winning scientists
96Playground GamesComputer games developerLeamington SpaDec 1445.27%10,592109Its latest Forza Horizon racing game allows players to explore Australia
97LittlefishIT services providerNottinghamSep 1544.63%*5,24580Provides IT support to 8,500 users in the Houses of Parliament
98Mansion House ConsultingIT consultancyCentral LondonJan 1644.46%*36,22694Opened its second Asian office last year in Bangalore, India
99Love Energy Savings.comEnergy price comparison siteBoltonDec 1544.40%6,48059Says it has helped 90,000 UK businesses save on energy costs since 2007
100CrunchOnline accountancy firmHoveMar 1643.69%*6,719170Over 9,000 micro-businesses use its software and accounting services

* supplied by company   annualised figure