Rank Company Location Year end Annual sales rise over 3 years Latest sales £000s Staff Comment
1 WonderblyPersonalised children's books East London Apr-17 294.27% *25,860 80 Has sold nearly 3m customisable children’s books in 200 countries
2 SmarketsBetting exchange Central London Dec-16 280.05% *25,417 78 Says its staff set their own salaries and have an unlimited holiday allowance
3 DarktraceCyber-security developer Cambridge Jun-17 267.61% *31,000 475 Has raised more than $180m from investors including Invoke Capital
4 Hunter MacdonaldIT consultancy Reading Jun-17 267.06% *29,147 437 Employs a team of more than 100 developers to create bespoke applications
5 TransferWiseCurrency transfer provider East London Mar-17 226.85% *67,010 598 Valued at above $1bn after raising $117m from backers including Sir Richard Branson
6 FesticketFestival booking services Central London Dec-16 224.83% 16,026 51 Has created a one-stop-shop for 2.5m festival-goers
7 OakbrookConsumer finance provider Nottingham Dec-16 213.84% 24,848 70 Uses machine learning to help estimate borrowers' credit risk
8 SuperAwesomeChildren's advertising services Central London Dec-16 210.71% *10,181 80 Serves some of the world's largest kids' brands from offices in America, Asia and Australia
9 LADbible GroupOnline entertainment community Manchester Dec-16 208.17% *9,221 110 Claims its flagship channels are followed by half of all 18-30 year olds in the UK
10 Receipt BankBookkeeping automation services Central London Dec-16 185.30% *6,177 185 Says 100,000 businesses in America, Europe and Australia use its bookkeeping software
11 GoCardlessPayment services provider Central London Dec-16 174.15% *5,969 120 Processes £3bn of direct debit payments a year for more than 25,000 businesses
12 BrainlabsDigital marketing agency Central London Mar-17 172.11% *14,753 105 Founder Dan Gilbert left Google to start this company in his parents’ attic in 2011
13 Outplay EntertainmentMobile games developer Dundee Dec-16 171.61% 15,585 210 More than 20m players have downloaded its Alien Creeps game
14 InfinoxCurrency trading platform Central London Mar-17 164.26% *17,542 18 Generates two-thirds of its sales from traders in Asia
15 Virtus Data CentresData centre operator Central London Dec-16 163.48% 23,573 45 Owns and operates data centres in Enfield, Hayes and Slough
16 OptalPayment services provider Central London Dec-16 162.84% *129,061 38 Offers payment processing in 34 currencies
17 HyperopticInternet services provider West London Dec-16 160.86% 8,775 297 Aims to provide superfast broadband to more than 2m homes by 2022
18 WDXWealth management platform Central London Sep-16 155.25% *6,172 40 Its software is used by 10 of the UK’s top 25 wealth management firms
19 PerkboxEmployee engagement services Central London Dec-16 146.34% *14,675 96 Companies use its platform to offer staff perks such as two-for-one meals
20 LoopMeAdvertising technology developer Central London Dec-16 143.74% 12,820 60 Says its artificial-intelligence technology reaches 2bn devices around the world
21 iwocaBusiness finance provider Central London Dec-16 128.53% *13,236 140 Its 140 employees include three former Olympians
22 UKCloudCloud services provider Farnborough Mar-17 127.13% *42,918 158 High-profile investors include Tim Henman, Andy Murray and Pink Floyd's Nick Mason
23 YieldifyMarketing technology developer Central London Apr-17 124.97% *9,106 103 Has raised nearly £15m from investors including Google Ventures and Softbank
24 LoveCraftsCrafts communities platform Central London Mar-17 124.62% *18,132 100 With £44m of venture capital, it has created a crafts community covering 140 countries
25 PsiOxusBiotechnology developer Abingdon Nov-16 120.50% *8,564 46 Its new solid tumour-destroying virus is entering clinical trials in America
26 ZappiStoreResearch services provider Central London Dec-16 116.87% 10,975 146 Holds weekly hackathons with its clients and programmers
27 Funding CirclePeer-to-peer lending platform Central London Dec-16 111.80% *50,878 741 Reports that more than £3bn has been lent through its website to 33,000 businesses
28 ImpulsePayMobile payment technology Central London Dec-16 109.50% *16,242 7 CrossCountry Trains uses its technology to charge customers for wi-fi access
29 NeuvenHR software developer Manchester Jul-16 107.11% 86,354 24 Its technology is used by employers of temporary staff
30 Love Energy SavingsPrice comparison website Bolton Dec-16 103.17% 13,207 114 Says it has helped 130,000 UK homes and businesses save on energy costs since 2007
31 Red BadgerDigital consultancy East London Oct-16 102.61% *7,015 75 Designed and built a new content management system for Sky
32 Threads StylingOnline fashion services East London Dec-16 102.30% *8,291 44 Uses social media to make it easier for fashionistas to buy luxury clothes
33 VictorOnline private jet hire Central London Dec-16 101.33% 29,592 59 Counts Sir Elton John among its investors
34 ImmunocoreBiotechnology developer Abingdon Dec-16 100.41% 16,465 279 Has raised £205m from investors including Woodford Investment Management and Malin
35 BlisAdvertising technology provider Central London Dec-16 100.15% *28,151 138 Its location-predicting tool is used by Stella Artois to target new customers in bars
36 StarLeafVideo conferencing provider Watford Dec-16 99.11% 6,048 130 Its founders set up Tech Track 100 alumnus Codian and sold it for $270m in 2007
37 LendInvestProperty finance provider Central London Mar-17 97.90% *22,111 102 It has taken a 10% share of the short-term mortgage market
38 CaptifyAdvertising technology company Central London Mar-17 96.05% *25,054 181 Analysis of 33bn searches a month provides data for its campaign and marketing insights
39 PM ConnectMobile content provider Birmingham Feb-17 95.54% †14,470 25 Bounce Games, iFitness and Love Food are among this company’s brands
40 WorldRemitCurrency transfer provider Central London Dec-16 95.07% *41,054 324 Founder came up with the idea for the business after paying huge fees on money transfers
41 BBOXXSolar system manufacturer West London Dec-16 94.77% *8,898 447 Aims to provide electricity for 20m people in developing countries by 2020
42 Double ElevenVideo games publisher Middlesbrough Sep-16 92.32% *6,112 38 Says its games have been played by more than 10m people worldwide
43 SymetricaRadiation detection equipment Southampton Sep-16 91.72% 8,175 50 Its technology can detect materials that may be used in dirty bombs
44 Media iQDigital marketing agency Central London Dec-16 91.20% *91,880 330 Develops its own analytical software in Bangalore, India
45 KanoEducational computer developer East London Dec-16 87.88% *6,295 44 Has shipped more than 150,000 of its build-your-own computer kits to 86 countries
46 Black Swan DataAnalytical software developer Central London May-17 87.22% *15,098 252 Last year it raised £6.2m to develop its product platform and accelerate international growth
47 AdaptiveFinancial software developer Central London Jun-17 86.24% *15,198 116 Increased staff from five to more than 100 in just five years
48 Capital on TapBusiness finance provider West London Mar-17 84.49% 9,080 54 Its founders also set up Paymentsense, No 63 in the league table
49 ZopaPeer-to-peer lending platform South London Dec-16 83.49% 33,220 188 Says it was the first European peer-to-peer lender to exceed £2bn in loans
50 Cloud Technology SolutionsCloud software developer Manchester Mar-17 82.62% *15,177 67 Its CloudMigrator software tool has moved 6.2m users to the cloud
51 EburyBusiness finance provider Central London Apr-17 82.12% *38,052 480 Has raised more than £85m from venture capital and private equity investors
52 FarfetchOnline fashion platform East London Dec-16 81.90% n/a 1,242 Secured a $397m investment from Chinese ecommerce business JD.com in June
53 Epos NowPayment systems developer Norwich May-17 81.21% *13,947 293 More than 30,000 businesses use its cloud-based point-of-sale systems
54 Performance HorizonMarketing software developer Newcastle Dec-16 77.61% 11,895 124 Its founders set up Tech Track 100 alumnus Buy.at and sold it to AOL for $125m in 2008
55 Qualasept PharmaxoPharmaceuticals manufacturer Wiltshire Apr-16 76.95% 87,857 141 Claims it has developed the UK's single biggest aseptic clean room
56 iPulseHair removal technology Swansea Dec-16 72.47% *17,492 32 Uses pulsed light technology to permanently remove unwanted body hair
57 Clyde SpaceSatellite manufacturer Glasgow Apr-16 71.95% *5,257 75 Builds up to 12 flight-ready mini-satellites each month
58 CashFlowsPayment services provider Cambridge Dec-16 71.91% *37,312 78 Acquired online payment provider iCheque last year
59 CitNOWVideo software developer Wokingham Dec-16 71.89% *7,019 67 Has subscribers in 44 countries, who produce 500 hours of video every day
60 geoSmart energy monitoring Cambridge Mar-17 71.76% *22,603 56 Has sold more than 4m devices to help people monitor energy usage in their homes
61 Trak Global GroupVehicle tracking technology Crewe Jun-17 70.60% *25,296 225 Says its software allows firms such as Rentokil to track their vehicles via employees’ phones
62 RateSetterPeer-to-peer lending platform East London Mar-17 68.00% *23,701 187 350,000 individuals and small firms have used its platform to borrow a total of £2bn
63 PaymentsensePayment services provider West London Mar-17 67.54% *62,301 235 Serves 57,000 small businesses and processed £5.5bn of card payments last year
64 GrapeshotAdvertising technology developer Cambridge Dec-16 65.68% 9,045 76 Its founders spent four years developing its technology before launching
65 AnalogFolkDigital marketing agency Central London Dec-16 64.50% *27,662 220 Created the first UK brand campaign to use Snapchat's wearable glasses, for Costa Coffee
66 EgressData security provider Central London Dec-16 62.09% 5,442 100 Users of its platform can revoke access to emails after they have reached the recipient's inbox
67 TouchNotePersonalised photo-card provider Central London Dec-16 62.07% *5,072 16 Has sent more than 9m personalised photo cards to 200 countries
68 Secret EscapesOnline travel services Central London Dec-16 61.31% *48,674 368 Has raised £51m from investors including Google Ventures
69 GiacomCloud services provider Hull Jul-16 60.73% 6,629 50 Its MessageStream platform is used by more than 4,000 software resellers
70 LPW TechnologyMetal powder manufacturer Cheshire Aug-16 60.69% †10,406 82 Investing £20m over two years to develop its manufacturing facilities and product range
71 Prepaid Financial ServicesPayment services provider Central London Dec-16 59.05% 41,843 48 Its prepaid cards are used by governments, multinational companies and individuals
72 CroudDigital marketing agency East London Mar-17 58.75% *7,714 83 Employs more than 1,200 digital marketing experts, or ‘Croudies’, around the world
73 Milk Visual EffectsVisual effects developer Central London Mar-17 57.94% *10,273 109 Co-founder Sara Bennett won an Oscar for creating visual effects used in the film Ex Machina
74 The Media ImageDigital marketing agency South London Feb-17 56.77% *18,398 33 Founded by the man who was the first recruit for Google UK's Adwords
75 IpsotekVideo analytics provider West London Dec-16 55.92% *5,062 41 Its patented software analyses CCTV footage to identify security threats
76 Bede GamingGambling software developer Newcastle Dec-16 54.41% *8,157 120 Employs 120 developers at its offices in Newcastle, London and Sofia, Bulgaria
77 MediatonicComputer games developer Central London Sep-16 53.77% *7,367 110 Worked with Warner Bros to create a mobile game for Harry Potter prequel Fantastic Beasts
78 InfoMediaMobile payment provider Northampton Oct-16 52.34% *34,020 30 Last year it processed 40m payments for customers' mobile phone bills
79 M Squared LasersLaser designer and manufacturer Glasgow Feb-16 52.13% *13,896 90 Its advanced laser systems are used by Nobel prize-winning scientists
80 Kimble ApplicationsSoftware developer Central London Dec-16 50.60% *5,206 41 Set up by serial entrepreneurs with backing from 30 angel investors
81 Infectious MediaAdvertising software developer Central London Mar-17 50.53% *45,177 101 Helps customers including Adidas and Expedia convert ad views to sales
82 NewVoiceMediaContact centre software developer Basingstoke Jan-17 50.18% *32,204 370 Has raised more than £100m from investors including BGF Ventures
83 ActiveQuotePrice comparison website Cardiff Sep-16 49.02% *7,598 129 Its technology is used by other websites such as Gocompare and uSwitch
84 BrandwatchSocial media monitoring Brighton Dec-16 48.96% 29,100 354 Says it collects 200m online data points every day
85 LystFashion search platform East London Mar-17 48.66% *10,538 120 Has raised £39m from technology investors including Accel Partners and Balderton
86 Godel TechnologiesSoftware developer Manchester Dec-16 48.65% *9,052 350 Is named after the late German mathematician Kurt Gödel
87 PrivateFlyOnline private jet hire St Albans May-17 48.38% *22,259 31 Opened an office in Fort Lauderdale last year to serve the growing American market
88 SpektrixTicketing software supplier Central London Dec-16 48.04% *5,152 65 Processed sales of more than 15m theatre tickets in 2016
89 ChameleonSmart energy monitoring Harrogate Dec-16 47.97% *10,860 21 Almost 2m of its energy display units have been installed in UK homes
90 Bullitt GroupConsumer electronics designer Reading Dec-16 46.86% *99,673 98 Sells its branded electronics to more than 70 countries
91 Lineup SystemsAdvertising technology developer Central London Jun-16 46.16% *7,285 85 Its software comes in 21 languages and has 8,000 users across 33 countries
92 RatioPrice comparison website Bournemouth Apr-17 46.11% *8,756 22 Its diverse services range from a price comparison site to an underwear subscription club
93 SaleCycleMarketing technology developer Tyne and Wear Mar-17 45.85% *12,034 154 It has helped companies such as Virgin Atlantic increase online sales by more than 5%
94 FeefoCustomer review platform Hampshire Mar-17 45.07% *8,090 100 More than 3,500 brands use Feefo to collect reliable customer feedback
95 DianomiContent marketing services Central London Dec-16 44.24% *8,702 22 Its technology places more than 3.5bn ads each month on financial news websites
96 MVFDigital marketing agency North London Mar-17 44.06% *54,257 319 In February it acquired publisher Startups.co.uk for an undisclosed sum
97 Know Your MoneyPrice comparison website Norwich Mar-17 43.94% *8,369 17 Its three co-founders launched the business in 2004 with a £5,000 credit-card loan
98 Edge Testing SolutionsSoftware testing provider Glasgow Dec-16 42.46% 10,099 91 Offers two hubs for its clients to test their products before launch
99 M24SevenInternet services provider Manchester Mar-17 42.43% *33,555 217 Acquired internet infrastructure and hosting firm M247 for £47.5m last October
100 CV-Library HoldingsOnline job site Hampshire Jun-16 42.03% 25,186 132 Stores nearly 12m CVs on its website

* supplied by company   annualised figure