Rank Company Location Year end Annual sales rise over 3 years Latest sales £000s Staff Comment
1 UKCloudCloud services provider Farnborough Mar 16 262.66% 32,052 97 Its platform powers online visa and driving licence applications for the government
2 Roc TechnologiesIT services provider Newbury Mar 16 221.18% 15,804 151 Has joint venture with academics from Oxford University to improve performance of IT projects
3 LoveCraftsCrafts communities platform Central London Mar 16 214.97% *10,886 80 With £18m of venture capital it has created a crafts community covering 140 countries
4 ImmunocoreBiotechnology developer Abingdon Sep 15 206.64% 14,305 150 Opened its first overseas office in October last year near Philadelphia
5 SmarketsSports betting exchange East London Dec 15 205.90% *10,400 41 Says its staff set their own salaries and have an unlimited holiday allowance
6 WorldRemitMoney transfer provider Central London Dec 15 180.35% 26,813 198 Founder came up with idea after paying excessive money transfer fees
7 SemblantLiquid-repellent nano-coatings maker Cambridgeshire Dec 15 172.77% *5,496 13 Claims its nano-coating technology is used to protect more than 100m mobile devices
8 Funding CirclePeer-to-peer lending Central London Dec 15 155.39% *32,093 320 More than £1.3bn has reportedly been lent through its website to 15,000 businesses
9 UNiDAYSStudent verification service Nottingham Apr 16 153.82% *11,385 112 Says its website and mobile app are used by 8.3m students worldwide
10 Ve InteractiveEcommerce technology developer Central London Dec 15 151.05% *33,783 800 Has raised more than £50m in funding from 500 investors
11 RTX Routetrader ExchangeTelecoms trading platform Central London Nov 15 148.25% †161,296 29 Its software is used by telecoms operators worldwide to buy and sell services
12 ImpulsePayMobile payment technology Newcastle Dec 15 148.09% *12,465 8 Virgin Trains uses this company's technology to charge customers for wi-fi access
13 6Point6IT consultancy Central London Feb 16 144.72% *7,193 58 Companies seek its expertise in the event of a cyber-attack
14 Tantalum CorporationVehicle tracking technology Uxbridge Dec 15 140.76% *16,084 145 Is helping to develop Samsung's car monitoring device
15 RateSetterPeer-to-peer lending East London Mar 16 133.63% *18,458 152 Has enabled investors to lend more than £1bn to individuals and businesses
16 VIRTUS Data CentresDatacentre services provider Central London Dec 15 133.57% 9,726 35 Owns and operates data centres in Enfield, Hayes and Slough
17 Miura SystemsPayment hardware provider High Wycombe Dec 15 129.31% 24,819 44 Approximately 80% of revenues come from overseas sales
18 FanDuelFantasy sports game developer Edinburgh Jun 15 128.17% †37,485 230 Launched a football-based fantasy sports game in the UK in August
19 CitNOWVideo software developer Wokingham Dec 15 126.62% *5,653 69 Has subscribers in 44 countries, who produce 500 hours of video every day
20 VictorOnline private jet hire Central London Dec 15 118.68% *16,472 70 Counts Sir Elton John among its investors
21 FairsailCloud-based HR systems Reading Dec 15 114.36% 5,567 62 Sage invested £10m for a 21% stake in the business in May
22 BBOXXSolar system manufacturer West London Dec 15 113.74% *5,309 199 Aims to provide electricity to 20m people in developing countries by 2020
23 CloudreachCloud services provider Central London Jul 16 111.98% *47,691 251 Worked with the Met Office to develop the infrastructure for its Weather Cloud platform
24 The Media ImageDigital marketing agency West London Feb 16 111.26% *10,256 23 Its founder was Google UK's fifth employee
25 BlisAdvertising technology provider Central London Dec 15 109.76% *15,129 97 In March raised $25m from Endeit Capital, Beringea and Unilever Ventures
26 PalringoMessaging and gaming platform East London Aug 15 109.15% 7,924 55 Has an office in Helsinki after acquiring a Finnish games developer
27 RealityMineMarket research software Manchester Dec 15 108.87% *5,331 100 Says it tracks more than 3m smartphones to capture data about users' habits
28 Fonix MobileMobile software developer Central London Jun 16 106.80% *41,468 20 Helped the BBC's Children in Need campaign raise over £6.5m in mobile phone donations
29 Redtail TelematicsVehicle tracking technology Cambridge Mar 16 106.32% *8,729 20 Says its hardware takes 1,000 readings a second once installed in cars
30 EburyBusiness finance provider Central London Apr 16 106.26% *22,440 350 Has raised more than £70m from venture capital investors
31 DigitaviaAudio-visual integrator Surrey Aug 15 104.19% 7,288 30 Has installed audio-visual equipment for companies such as eBay and PayPal
32 Epos NowPayment systems developer Norwich May 16 103.56% *9,180 285 Says its point-of-sale systems have processed more than 5bn transactions in 103 countries
33 Focus Group EuropeIT consultancy Central London Dec 15 98.35% *5,049 43 Helps Standard Life, Olswang and others implement IT systems for sales, finance and HR
34 ESP GroupMass transit smartcards Hull Jul 15 96.25% 67,727 314 Issues Oyster cards for London Underground as well as rail cards used nationally
35 Junifer SystemsCustomer care software Central London Jul 16 91.54% *5,549 62 Started by the co-founders of Calculus Solutions, which was sold for £50m
36 ZopaPeer-to-peer lending Central London Dec 15 90.75% 20,640 111 Has reportedly facilitated more than £1.6bn in peer-to-peer loans
37 Performance HorizonMarketing software developer Newcastle Dec 15 89.87% *6,181 81 Says it connects 160,000 online marketers and affiliates in 183 countries
38 SalecycleMarketing technology developer Tyne and Wear Mar 16 88.72% *8,956 114 Helps Ikea, Dyson, Virgin Atlantic and the like convert web visitors into customers
39 Green Energy OptionsSmart home monitoring Cambridge Mar 16 86.98% *14,835 60 Has sold 3m devices to help people monitor and manage energy use in their homes
40 ECS SecurityIT security services Glasgow Dec 15 86.14% *12,214 77 Its customers include three of the UK's five biggest banks
41 TORI GlobalIT services provider Central London Mar 16 85.58% *34,561 52 Helps financial institutions manage compliance and organisational change
42 FarfetchDesigner fashion website Central London Dec 15 85.07% *335,074 500 Allows shoppers to browse more than 400 international fashion boutiques online
43 Bullitt GroupMobile phone designer Reading Dec 15 84.25% *64,112 120 Is developing a smartphone and other accessories for Land Rover
44 Red BadgerSoftware developer East London Oct 15 82.73% *5,656 57 Developed a mobile app for the Haller Foundation, pro bono, to help Kenyan farmers
45 AdzunaJob search website West London Jun 16 80.15% *5,559 40 Its ValueMyCV tool estimates jobseekers’ earning power
46 PrivateFlyOnline private jet hire St Albans May 15 78.49% *10,236 21 Launched in 2008 with £2m, it now has more than 7,000 private jets on its booking system
47 Ideal NetworksIT services provider Brighton Dec 15 77.66% *9,303 46 Manages and supports IT networks in 34 countries
48 Managed 24/7IT services provider Milton Keynes Sep 15 76.79% *6,334 44 Uses predictive analytics to prevent IT & telecoms outages
49 Trak GlobalVehicle tracking technology Crewe Jun 16 74.62% *13,305 69 Insurers such as More Th>n use its driving behaviour software to manage risk
50 NeuvenStaff administration software Manchester Jul 15 74.23% 60,254 14 Its software is used by companies that employ temporary labour
51 LPW TechnologyMetal powder manufacturer Cheshire Aug 15 73.09% *7,380 36 Its metal powders are used in 3D-printing of products such as turbine blades and dental implants
52 Cloud Technology SolutionsCloud software developer Manchester Mar 16 72.38% *8,639 34 Has used its software to move nearly 12,000 companies in 20 countries onto Google Apps
53 CommAgilityTelecoms electronics manufacturer Loughborough Sep 15 70.98% *13,156 45 Provides the technology used for 4G phone networks and for research into 5G
54 MDS TechnologiesCloud services consultancy Wiltshire Apr 15 69.46% 5,393 40 Director Phil Dawson co-founded UKCloud, the company at No 1
55 FeefoCustomer review software Hampshire Mar 16 68.07% *6,008 84 Collects consumer reviews for more than 3,000 clients such as the travel site Expedia
56 Prepaid Financial ServicesPayment services provider Central London Dec 15 67.15% 28,814 47 Its prepaid cards are used by governments, multinational companies and individuals
57 AnalogFolkDigital marketing agency Central London Dec 15 65.82% 15,962 125 Launched its new data intelligence division, AnalogFolk DNA, in February
58 DigitalboxAdvertising technology consultancy Bath Apr 16 65.56% *8,658 42 Sold ContentClick, its ad platfom for bloggers, to the US ad network RevContent in January
59 Exco InTouchMedical technology provider Nottingham Apr 16 63.42% *11,820 102 Says 26,000 hospitals and clinics use its technology to capture clinical trials data
60 Qualasept PharmaxoPharmaceutical manufacturer Wiltshire Apr 15 62.79% 48,688 119 Claims it has developed the UK's single biggest aseptic clean room
61 Green Man GamingDigital games retailer Central London Dec 15 61.74% 29,560 60 Has launched a publishing label to help bring new video games to the market
62 Esprit DigitalDigital screen manufacturer Stevenage Dec 15 58.56% *7,327 11 Created the digital advertising screens lining escalators in London Underground stations
63 Lineup SystemsAdvertising technology developer West London Jun 15 56.85% *5,402 85 Time Inc and News UK are two of this software company’s customers
64 DufrainData consultancy Edinburgh May 16 54.93% *8,465 112 Help banks store, process and understand customer data
65 ZutoCar finance specialist Cheshire Feb 16 54.65% *23,094 355 Is looking to recruit an extra 70 members of staff before the end of the year
66 ChargemasterElectric vehicle charging Luton Dec 15 54.10% 13,171 130 Is the official charging partner for Nissan’s electric cars in the UK
67 Harlex ConsultingIT consultancy Central London Sep 15 53.92% *5,132 37 Helps businesses such as Sony Music and G4S get more from their data
68 Edge Testing SolutionsSoftware testing Glasgow Dec 15 53.30% 9,316 84 Last year opened a facility where developers can test software for free
69 MoblicitiMobile IT services Surrey Mar 16 53.22% *7,010 20 Helped roll out wi-fi across Nationwide Building Society’s 700 branches and offices
70 PaymentsensePayment processing services Central London Mar 16 52.93% *44,852 203 Helps more than 50,000 small businesses process credit card payments
71 SkyscannerTravel search engine Edinburgh Dec 15 52.92% 119,715 674 Is featuring in Tech Track 100 for a seventh consecutive year
72 Ndemic CreationsComputer games developer Bristol Mar 16 52.61% *8,582 8 Says over 85m players worldwide have downloaded its Plague Inc game
73 Breathing BuildingsSustainable ventilation developer Cambridge Mar 16 52.25% *7,800 44 Provided ventilation technology for Costa Coffee's ‘zero energy’ cafe in Telford
74 WifinityInternet services provider Surrey Aug 15 52.23% 5,521 35 Specialises in providing wi-fi to remote and hard-to-reach military sites
75 Conveyancing Data ServicesConveyancing search software Reading Mar 16 51.75% *7,495 63 Three former colleagues invested just £1,500 to start this company in 2010
76 JellyfishDigital marketing agency Central London Mar 16 50.87% *50,243 304 Acquired digital publishing software company MagazineCloner last year
77 essensysCloud services provider Central London Jul 15 50.76% 11,728 36 Plans to open a second US office in California before the end of 2016
78 Channel TelecomTelecoms service provider North London Dec 15 50.50% *10,293 23 Provides telecoms services to companies such as American Express and Gucci
79 TestPlantSoftware testing tools Central London Dec 15 50.29% 9,075 67 Recently opened its third US office in Philadelphia
80 IT LabIT services provider Central London Mar 16 49.49% 31,118 331 Provides IT support to 3,000 workers at the sports car maker McLaren’s technology hub
81 SpiraliteDuctwork manufacturer Essex Jun 15 49.30% 9,422 58 Claims its patented product is up to 40% more energy-efficient than traditional metal ducts
82 GBM DigitalIT consultancy Manchester Dec 15 48.96% *34,920 40 Helps schools deploy technology in the classroom
83 Cloud DistributionCloud services provider Reading Dec 15 48.74% *13,230 26 Its partners include the American IT firms Aerohive and Check Point
84 ActiveQuotePrice comparison website Cardiff Sep 15 48.60% *5,850 110 Its technology is also used by other comparison sites such as Confused.com
85 EdenhouseIT consultancy Warwickshire Mar 16 47.78% 31,710 195 Says it has completed 800 SAP software projects to date
86 CalastoneFund transaction network Central London Dec 15 47.28% *15,115 109 Automates investment fund transactions and processes across different platforms
87 moneyPrice comparison website Gloucestershire Oct 15 47.05% 23,638 43 Says it attracts around 2.5m unique users to its website every month
88 Hutchinson NetworksIT consultancy Edinburgh Dec 15 46.98% *5,079 60 Provides customer support through a network of 3,000 engineers around the world
89 ViastakIT services provider Central London Dec 15 46.82% *6,382 30 Its iFollowOffice cloud desktop product took five years to develop
90 LoveLiveVideo agency for music Central London Dec 15 46.77% *7,001 55 Its music video platform is used by The Guardian and Time Out
91 GrapeshotAdvertising technology developer Cambridge Dec 15 46.67% *5,020 75 Plans to open offices in San Francisco, China and Japan after raising £6.6m in February
92 POD PointElectric vehicle charging Central London Jun 15 46.47% 6,418 50 Has sold more than 27,000 electric vehicle charging points
93 iStoragePortable data storage Middlesex Jul 15 46.38% 5,726 15 Sells its encrypted data storage devices to the Ministry of Defence and Google
94 CashflowsPayment services provider Cambridge Dec 15 46.14% 19,909 59 Its in-house technology enables 1,500 businesses to accept card payments online
95 M SquaredLaser designer and manufacturer Glasgow Feb 16 45.82% *9,414 75 Its advanced laser systems are used by Nobel prize-winning scientists
96 Playground GamesComputer games developer Leamington Spa Dec 14 45.27% 10,592 109 Its latest Forza Horizon racing game allows players to explore Australia
97 LittlefishIT services provider Nottingham Sep 15 44.63% *5,245 80 Provides IT support to 8,500 users in the Houses of Parliament
98 Mansion House ConsultingIT consultancy Central London Jan 16 44.46% *36,226 94 Opened its second Asian office last year in Bangalore, India
99 Love Energy Savings.comEnergy price comparison site Bolton Dec 15 44.40% 6,480 59 Says it has helped 90,000 UK businesses save on energy costs since 2007
100 CrunchOnline accountancy firm Hove Mar 16 43.69% *6,719 170 Over 9,000 micro-businesses use its software and accounting services

* supplied by company  † annualised figure