Rank Company Location Year end Annual sales rise over 3 years Latest sales £000s Staff Comment
1 Plan.comCommunications provider Isle of Man Sep-17 364.38% *35,418 90 About 650 partners use its telecoms platform to support more than 100,000 UK business customers
2 PsiOxusBiotechnology developer Oxfordshire Dec-17 311.67% 53,136 54 Received a $15m milestone payment from its development partner Bristol-Myers Squibb in December
3 CensorNetCloud security software developer Basingstoke Dec-17 210.17% *7,535 77 Has more than 4,000 customers, including McDonald’s in France and the European Central Bank
4 thoughtonomyAutomation software developer East London May-18 205.20% *16,916 100 It sells to 28 countries and 50% of revenue is generated from overseas
5 PerkboxEmployee engagement services Central London Dec-17 204.12% *34,700 200 Acquired software platform Loyalty Bay for an undisclosed sum in November
6 OguryMobile data marketing North London Dec-17 204.09% 33,760 133 It has access to data from more than 400m mobile phone users in 120 countries
7 VerveMarketing software developer Central London Dec-17 202.15% *10,747 130 Its network of 25,000 ‘micro-influencers’ have sold half a million event tickets since 2014
8 goHenryChildren's pre-paid card developer Central London Dec-17 200.87% *6,116 61 The company is named after the first child to make a transaction with one of its cards
9 DarktraceCybersecurity developer Cambridge Jun-18 195.51% *58,573 694 Was reportedly valued at $1.25bn in April when Vitruvian Partners bought a small stake
10 BizumaB2B e-commerce platform Central London Mar-18 181.75% *9,608 48 Originally founded as a flash sales website before changing direction in 2014
11 DepopSocial shopping app Central London Dec-17 175.70% *94,300 95 More than 10m people use its platform to buy and sell vintage clothing
12 Laser Wire SolutionsLaser wire-stripping machinery Pontypridd Dec-17 173.41% *5,114 26 Swiss technology group Schleuniger took a 20% stake in 2016
13 Bought By ManySpecialist insurance platform Central London Mar-18 170.20% *19,727 78 Launched its own travel insurance policy for people with severe medical conditions in December
14 OptalPayment services provider Central London Dec-17 169.29% 177,653 65 Uses the Mastercard processing network to facilitate payments in 34 currencies
15 InfinoxCurrency trading platform Central London Mar-18 155.18% *41,700 48 Provides users with an AI-generated news feed that could affect currency trades
16 OakbrookConsumer finance provider Nottingham Dec-17 154.54% *40,400 98 Uses machine learning to help estimate borrowers’ credit risk
17 CarwowCar sales platform Central London Dec-17 147.21% *15,276 127 Claims its car review videos have more viewers than the hit BBC series Top Gear
18 Receipt BankBook-keeping automation services Central London Dec-17 146.07% *11,667 341 Says 150,000 businesses in America, Europe and Australia use its book-keeping software
19 dB BroadcastBroadcast technology provider Cambridgeshire Sep-17 143.58% 34,943 50 Its key customers include Sky, YouTube, Bloomberg and the BBC
20 The Car Buying GroupCar sales platform Wakefield Mar-18 140.89% *39,140 31 Runs a free nationwide doorstep vehicle collection service
21 FesticketFestival booking platform Central London Dec-17 139.86% 35,839 88 Sells tickets and packages to more than 1,000 festivals worldwide
22 PlanixsSoftware developer Manchester Mar-17 133.70% *7,240 67 More than £200bn worth of transactions have been analysed using its systems
23 GigaclearInternet services provider Oxfordshire Dec-17 130.17% 7,402 210 Has connected more than 16,000 rural customers to broadband in 22 counties
24 TransferWiseCurrency transfer provider East London Mar-18 129.39% *117,283 1000 Was valued at $1.6bn in November after it raised $280m, taking its funding total to $396m
25 PatSnapR&D data platform West London Dec-17 126.18% *17,977 752 Has raised more than $100m from investors including Sequoia and Shunwei Capital
26 HyperopticInternet services provider West London Dec-17 119.90% 16,572 411 Aims to provide superfast broadband to more than 2m homes by 2022
27 GoCardlessPayment services provider Central London Dec-17 112.99% *11,896 165 International expansion plans include targeting Australia, New Zealand, Canada and the US
28 PurpleWifi services provider Oldham Jan-18 112.88% *5,586 93 Its technology is used in every public airport in Spain and in a 21,000-capacity stadium in Miami
29 Trustpay GlobalOnline payment provider Guildford Mar-18 110.45% *9,796 25 The Premier Lotto in Nigeria uses the company’s platform to prevent money laundering
30 iwocaBusiness finance provider Central London Dec-17 109.27% *25,000 200 Its 140 employees include three former Olympians
31 LADBible GroupOnline entertainment community Manchester Dec-17 108.91% *15,500 133 Claims its flagship brand reaches more than half of all millennials in the UK every month
32 Threads StylingOnline fashion services East London Dec-17 107.88% *12,672 55 Some three-quarters of its sales are to fashionistas in the Middle East
33 Prodigy FinanceStudent finance provider Central London Dec-17 105.94% *10,273 133 More than 10,000 students have used its platform to fund their postgraduate studies
34 AzimoOnline money transfers Central London Jun-17 103.79% 5,870 115 Recently launched its international money transfer service for businesses
35 ChameleonSmart energy monitoring Harrogate Dec-17 101.10% 19,890 32 About 2.5m of its energy display units have been installed in UK homes
36 SuperAwesomeChildren's privacy protection Central London Dec-17 97.91% *14,935 130 Last month it signed a deal with Pokémon Go, allowing parents to manage their child’s privacy settings
37 GoustoMeal kit delivery services West London Dec-17 97.32% *23,300 400 Aims to provide the ingredients for 400m meals in UK homes by 2025
38 VizolutionBusiness software developer Swansea Dec-17 94.99% *6,965 118 Its DigiDocs software lets RBS customers complete mortgage applications digitally
39 MoveGBActivity membership Bath Dec-17 94.93% *5,029 41 Has 300,000 subscribers gaining access to more than 6,000 fitness venues
40 BBOXXSolar system manufacturer West London Dec-17 93.35% *20,416 443 Has raised almost $70m in venture funding and debt financing
41 Funding CirclePeer-to-peer lending platform Central London Dec-17 93.21% *94,500 790 Is planning an IPO in London this autumn that will value it at more than £1.5bn
42 LoopMeAdvertising technology developer Central London Dec-17 93.04% 24,493 91 Says its AI technology reaches 2bn devices around the world
43 KanoEducational computer developer East London Dec-17 91.81% *13,000 60 Has customers in 150 countries and aims to have 100m global users by 2020
44 Capital on TapBusiness finance provider West London Mar-18 88.73% 17,318 56 This company’s founders also set up Paymentsense, No 91 in the league table
45 HutchVideo games developer Central London Sep-17 88.63% *8,766 (2017) 51 Its Hot Wheels Race Off game has been played in 190 countries including Antarctica and Vatican City
46 ENSEKEnergy software developer Nottingham Mar-18 87.56% *6,161 110 A fifth of the UK’s energy suppliers are said to use this company’s software
47 MiQDigital marketing agency Central London Dec-17 87.36% *155,876 561 Relocated its New York base in April, tripling its office space
48 StarLeafVideo conferencing platform Watford Dec-17 86.89% 11,427 133 Its founders set up the Tech Track 100 alumnus Codian and sold it for $270m in 2007
49 BigChangeManagement software developer Leeds Dec-17 86.45% *6,566 41 Last year its technology saved 15m sheets of paper and facilitated 9m tasks
50 The Lead AgencyLead generation developer Liverpool Dec-17 80.38% †6,383 96 Works with every large automotive brand in the UK
51 UNiDAYSStudent verification services Nottingham Apr-18 80.03% *27,400 210 Connects brands with 10m students in 114 countries
52 FarfetchOnline fashion platform East London Dec-17 78.31% *299,812 2,700 Has announced plans to float in the US with a reported $5bn valuation
53 Assetz CapitalPeer-to-peer lending platform Manchester Mar-18 77.91% *13,700 98 Has funded the construction of 1,800 new homes since 2013
54 iPulseHair removal technology Swansea Dec-17 77.12% *32,874 39 Almost 95% of its hair removal devices are sold overseas
55 GiacomCloud services provider Hull Jul-17 76.14% 13,883 49 It now reaches more than 500,000 end users across the UK
56 Arcus GlobalCloud IT developer Cambridge Jun-17 75.57% *9,681 110 In May it secured a £3m investment from the private equity firm YFM, valuing it at £27m
57 disguiseLive event technology provider Central London Dec-17 75.46% *17,971 59 Customers include the likes of Disney and Universal Studios
58 Tech21Device impact protection maker Southwest London May-17 75.34% 121,576 81 Became an inaugural member of Google’s certified accessories programme last year
59 VictorOnline private jet hire Central London Dec-17 74.13% *41,508 113 Counts Sir Elton John among its investors
60 CinesiteVisual effects and animation Central London Apr-17 74.11% 43,888 699 Is producing visual effects for Mary Poppins Returns and the Marvel franchise
61 Biosite SystemsWorkforce management software Solihull Jul-17 74.04% *6,401 117 More than 200,000 of the UK’s construction workers are registered on its systems
62 EcometricaEnvironmental reporting software Edinburgh Mar-18 71.67% 5,496 40 Helps 250 companies on five continents to manage their environmental impacts
63 Qualasept PharmaxoPharmaceuticals manufacturer Wiltshire Apr-17 70.89% 152,744 156 Its manufacturing facility and offices have a zero carbon footprint
64 EdesixBody camera manufacturer Edinburgh Dec-17 70.52% *5,900 47 Founders Richie McBride and Robin Iddon competed on the TV show Robot Wars
65 LendInvestProperty finance provider Central London Mar-18 70.13% 35,617 128 Has facilitated more than £1.4bn of property loans
66 E3D Online3D printer developer Oxfordshire Apr-18 69.08% *5,800 41 Has grown its exports to account for 75% of its total sales
67 LystFashion search platform East London Mar-18 68.34% *15,300 100 LVMH, the owner of Christian Dior and Louis Vuitton, invested an undisclosed amount in May
68 DiaceuticsMedtech research provider Belfast Dec-17 67.80% *7,390 57 Works with 31 of the top 35 pharmaceutical companies in the world
69 AmplienceDigital media technology Central London Jun-17 66.25% *8,147 85 Helps retailers such as Argos and Mulberry to create and manage online content
70 GlucoRxDiabetes product manufacturer Woking Mar-17 65.52% 24,885 26 Claims to have saved the NHS £150m in the past three years
71 Love Energy SavingsPrice comparison website Bolton Dec-17 64.26% 17,361 183 Has helped 145,000 UK homes and businesses save on energy costs since 2007
72 Creative VirtualChatbot developer East London Dec-17 63.30% *8,400 99 Its trademarked chatbot can be used through Facebook Messenger and Amazon Alexa
73 EburyBusiness finance provider Central London Apr-18 62.77% *47,000 628 Has traded £12.5bn in foreign exchange in 140 different currencies
74 ZappiStoreResearch services provider Central London Dec-17 61.62% 19,323 128 Holds weekly hackathons with its clients and programmers
75 BlisLocation data technology Central London Dec-17 61.28% *33,400 186 Analyses more than 5.5bn data points each day
76 BookingBugBooking systems developer Central London Mar-18 60.61% *6,937 117 Raised nearly £10m in April from backers including PeakSpan Capital and Downing Ventures
77 EgressData security provider Central London Dec-17 60.22% 9,403 115 Users of its platform can revoke access to emails after they have reached the recipient’s inbox
78 Contis GroupPayment services provider North Yorkshire Mar-17 59.56% 7,161 86 Appointed the former European boss of American Express to drive sales on the continent
79 PM ConnectMobile content provider Birmingham Feb-18 59.44% *19,317 35 Its clients include World Wrestling Entertainment and the NBA
80 ZopaPeer-to-peer lending platform South London Dec-17 59.43% *46,500 312 About £3.5bn has been advanced through its platform
81 WorldRemitOnline money transfers Central London Dec-17 59.07% *61,000 440 Has raised $220m since 2010 to expand its online money transfer service
82 DianomiFinancial content marketing Central London Dec-17 58.99% *12,861 25 Works with eight of the top 10 global asset managers
83 LiberisCash advance provider West London Dec-17 57.99% *15,150 75 Received £57.5m in funding in April from investors including Blenheim Chalcot
84 CurrencycloudPayment services provider East London Dec-17 57.48% *13,600 140 Has 250 clients and 2m end users across the world
85 FeaturespaceAnalytics software developer Cambridge Dec-17 57.48% *5,170 113 Is recruiting for more than 100 positions this year, following customer demand in UK and US
86 Cloud Technology SolutionsCloud IT developer Manchester Mar-18 57.21% *21,902 102 Its software has moved nearly 12,000 companies in 20 countries onto Google Apps
87 Leisure Pass GroupTourism smartcard developer Central London Dec-17 57.16% †225,803 105 Has partnered with the booking platform Ctrip to target Chinese tourists visiting Europe
88 rradarLegal digital services Hull Dec-17 57.03% *5,083 125 Uses machine learning and AI to provide legal advice to customers
89 Converge TSCloud services provider Cheshire Dec-17 55.00% *5,802 38 Focused solely on the legal sector after its first three clients were all law firms
90 Kimble ApplicationsSoftware developer Central London Dec-17 54.67% *9,153 78 More than half of its new business is in the US, where it has offices in Boston and Park City
91 PaymentsensePayment services provider West London Mar-18 53.54% *72,400 243 Processed more than £6.5bn of card payments last year in the UK and Ireland
92 Godel TechnologiesSoftware developer Manchester Dec-17 53.01% *13,853 637 Is named after the late German mathematician Kurt Gödel
93 Secret EscapesOnline travel services Central London Dec-17 52.99% *73,000 850 Has raised £132m from investors including Google Ventures
94 NeuvenHR software developer Manchester Jul-17 52.23% 130,071 28 Appearing on Tech Track 100 for a fourth consecutive year
95 CitNOWVideo software developer Wokingham Dec-17 51.85% *11,611 71 Has more than 8,000 installations in franchised car dealerships in 45 countries
96 geoSmart energy monitoring Cambridge Mar-18 51.24% *29,406 85 Customers in Norway, Sweden and Luxembourg use its smart energy monitoring devices
97 Vision RTMedical technology developer North London Jul-17 50.99% 32,468 132 Has secured 60 patents and has another 46 pending
98 ThreadOnline fashion services Central London Dec-17 50.77% *6,492 60 More than 800,000 men subscribe to its free personal styling service
99 The Media ImageDigital marketing agency South London Feb-18 50.38% *27,515 37 Founded by the man who was Google UK’s first recruit when it launched its AdWords service in 2002
100 Brompton TechnologyVideo technology provider West London Aug-17 50.17% *5,250 27 Its technology is used in high-profile events such as the Oscars

* supplied by company  † annualised figure