RankCompanyLocationYear endAnnual sales rise over 3 yearsLatest sales £000sStaffComment
1WonderblyPersonalised children's booksEast LondonApr-17294.27%*25,86080Has sold nearly 3m customisable children’s books in 200 countries
2SmarketsBetting exchangeCentral LondonDec-16280.05%*25,41778Says its staff set their own salaries and have an unlimited holiday allowance
3DarktraceCyber-security developerCambridgeJun-17267.61%*31,000475Has raised more than $180m from investors including Invoke Capital
4Hunter MacdonaldIT consultancyReadingJun-17267.06%*29,147437Employs a team of more than 100 developers to create bespoke applications
5TransferWiseCurrency transfer providerEast LondonMar-17226.85%*67,010598Valued at above $1bn after raising $117m from backers including Sir Richard Branson
6FesticketFestival booking servicesCentral LondonDec-16224.83%16,02651Has created a one-stop-shop for 2.5m festival-goers
7OakbrookConsumer finance providerNottinghamDec-16213.84%24,84870Uses machine learning to help estimate borrowers' credit risk
8SuperAwesomeChildren's advertising servicesCentral LondonDec-16210.71%*10,18180Serves some of the world's largest kids' brands from offices in America, Asia and Australia
9LADbible GroupOnline entertainment communityManchesterDec-16208.17%*9,221110Claims its flagship channels are followed by half of all 18-30 year olds in the UK
10Receipt BankBookkeeping automation servicesCentral LondonDec-16185.30%*6,177185Says 100,000 businesses in America, Europe and Australia use its bookkeeping software
11GoCardlessPayment services providerCentral LondonDec-16174.15%*5,969120Processes £3bn of direct debit payments a year for more than 25,000 businesses
12BrainlabsDigital marketing agencyCentral LondonMar-17172.11%*14,753105Founder Dan Gilbert left Google to start this company in his parents’ attic in 2011
13Outplay EntertainmentMobile games developerDundeeDec-16171.61%15,585210More than 20m players have downloaded its Alien Creeps game
14InfinoxCurrency trading platformCentral LondonMar-17164.26%*17,54218Generates two-thirds of its sales from traders in Asia
15Virtus Data CentresData centre operatorCentral LondonDec-16163.48%23,57345Owns and operates data centres in Enfield, Hayes and Slough
16OptalPayment services providerCentral LondonDec-16162.84%*129,06138Offers payment processing in 34 currencies
17HyperopticInternet services providerWest LondonDec-16160.86%8,775297Aims to provide superfast broadband to more than 2m homes by 2022
18WDXWealth management platformCentral LondonSep-16155.25%*6,17240Its software is used by 10 of the UK’s top 25 wealth management firms
19PerkboxEmployee engagement servicesCentral LondonDec-16146.34%*14,67596Companies use its platform to offer staff perks such as two-for-one meals
20LoopMeAdvertising technology developerCentral LondonDec-16143.74%12,82060Says its artificial-intelligence technology reaches 2bn devices around the world
21iwocaBusiness finance providerCentral LondonDec-16128.53%*13,236140Its 140 employees include three former Olympians
22UKCloudCloud services providerFarnboroughMar-17127.13%*42,918158High-profile investors include Tim Henman, Andy Murray and Pink Floyd's Nick Mason
23YieldifyMarketing technology developerCentral LondonApr-17124.97%*9,106103Has raised nearly £15m from investors including Google Ventures and Softbank
24LoveCraftsCrafts communities platformCentral LondonMar-17124.62%*18,132100With £44m of venture capital, it has created a crafts community covering 140 countries
25PsiOxusBiotechnology developerAbingdonNov-16120.50%*8,56446Its new solid tumour-destroying virus is entering clinical trials in America
26ZappiStoreResearch services providerCentral LondonDec-16116.87%10,975146Holds weekly hackathons with its clients and programmers
27Funding CirclePeer-to-peer lending platformCentral LondonDec-16111.80%*50,878741Reports that more than £3bn has been lent through its website to 33,000 businesses
28ImpulsePayMobile payment technologyCentral LondonDec-16109.50%*16,2427CrossCountry Trains uses its technology to charge customers for wi-fi access
29NeuvenHR software developerManchesterJul-16107.11%86,35424Its technology is used by employers of temporary staff
30Love Energy SavingsPrice comparison websiteBoltonDec-16103.17%13,207114Says it has helped 130,000 UK homes and businesses save on energy costs since 2007
31Red BadgerDigital consultancyEast LondonOct-16102.61%*7,01575Designed and built a new content management system for Sky
32Threads StylingOnline fashion servicesEast LondonDec-16102.30%*8,29144Uses social media to make it easier for fashionistas to buy luxury clothes
33VictorOnline private jet hireCentral LondonDec-16101.33%29,59259Counts Sir Elton John among its investors
34ImmunocoreBiotechnology developerAbingdonDec-16100.41%16,465279Has raised £205m from investors including Woodford Investment Management and Malin
35BlisAdvertising technology providerCentral LondonDec-16100.15%*28,151138Its location-predicting tool is used by Stella Artois to target new customers in bars
36StarLeafVideo conferencing providerWatfordDec-1699.11%6,048130Its founders set up Tech Track 100 alumnus Codian and sold it for $270m in 2007
37LendInvestProperty finance providerCentral LondonMar-1797.90%*22,111102It has taken a 10% share of the short-term mortgage market
38CaptifyAdvertising technology companyCentral LondonMar-1796.05%*25,054181Analysis of 33bn searches a month provides data for its campaign and marketing insights
39PM ConnectMobile content providerBirminghamFeb-1795.54%†14,47025Bounce Games, iFitness and Love Food are among this company’s brands
40WorldRemitCurrency transfer providerCentral LondonDec-1695.07%*41,054324Founder came up with the idea for the business after paying huge fees on money transfers
41BBOXXSolar system manufacturerWest LondonDec-1694.77%*8,898447Aims to provide electricity for 20m people in developing countries by 2020
42Double ElevenVideo games publisherMiddlesbroughSep-1692.32%*6,11238Says its games have been played by more than 10m people worldwide
43SymetricaRadiation detection equipmentSouthamptonSep-1691.72%8,17550Its technology can detect materials that may be used in dirty bombs
44Media iQDigital marketing agencyCentral LondonDec-1691.20%*91,880330Develops its own analytical software in Bangalore, India
45KanoEducational computer developerEast LondonDec-1687.88%*6,29544Has shipped more than 150,000 of its build-your-own computer kits to 86 countries
46Black Swan DataAnalytical software developerCentral LondonMay-1787.22%*15,098252Last year it raised £6.2m to develop its product platform and accelerate international growth
47AdaptiveFinancial software developerCentral LondonJun-1786.24%*15,198116Increased staff from five to more than 100 in just five years
48Capital on TapBusiness finance providerWest LondonMar-1784.49%9,08054Its founders also set up Paymentsense, No 63 in the league table
49ZopaPeer-to-peer lending platformSouth LondonDec-1683.49%33,220188Says it was the first European peer-to-peer lender to exceed £2bn in loans
50Cloud Technology SolutionsCloud software developerManchesterMar-1782.62%*15,17767Its CloudMigrator software tool has moved 6.2m users to the cloud
51EburyBusiness finance providerCentral LondonApr-1782.12%*38,052480Has raised more than £85m from venture capital and private equity investors
52FarfetchOnline fashion platformEast LondonDec-1681.90%*622,2171242Secured a $397m investment from Chinese ecommerce business JD.com in June
53Epos NowPayment systems developerNorwichMay-1781.21%*13,947293More than 30,000 businesses use its cloud-based point-of-sale systems
54Performance HorizonMarketing software developerNewcastleDec-1677.61%11,895124Its founders set up Tech Track 100 alumnus Buy.at and sold it to AOL for $125m in 2008
55Qualasept PharmaxoPharmaceuticals manufacturerWiltshireApr-1676.95%87,857141Claims it has developed the UK's single biggest aseptic clean room
56iPulseHair removal technologySwanseaDec-1672.47%*17,49232Uses pulsed light technology to permanently remove unwanted body hair
57Clyde SpaceSatellite manufacturerGlasgowApr-1671.95%*5,25775Builds up to 12 flight-ready mini-satellites each month
58CashFlowsPayment services providerCambridgeDec-1671.91%*37,31278Acquired online payment provider iCheque last year
59CitNOWVideo software developerWokinghamDec-1671.89%*7,01967Has subscribers in 44 countries, who produce 500 hours of video every day
60geoSmart energy monitoringCambridgeMar-1771.76%*22,60356Has sold more than 4m devices to help people monitor energy usage in their homes
61Trak Global GroupVehicle tracking technologyCreweJun-1770.60%*25,296225Says its software allows firms such as Rentokil to track their vehicles via employees’ phones
62RateSetterPeer-to-peer lending platformEast LondonMar-1768.00%*23,701187350,000 individuals and small firms have used its platform to borrow a total of £2bn
63PaymentsensePayment services providerWest LondonMar-1767.54%*62,301235Serves 57,000 small businesses and processed £5.5bn of card payments last year
64GrapeshotAdvertising technology developerCambridgeDec-1665.68%9,04576Its founders spent four years developing its technology before launching
65AnalogFolkDigital marketing agencyCentral LondonDec-1664.50%*27,662220Created the first UK brand campaign to use Snapchat's wearable glasses, for Costa Coffee
66EgressData security providerCentral LondonDec-1662.09%5,442100Users of its platform can revoke access to emails after they have reached the recipient's inbox
67TouchNotePersonalised photo-card providerCentral LondonDec-1662.07%*5,07216Has sent more than 9m personalised photo cards to 200 countries
68Secret EscapesOnline travel servicesCentral LondonDec-1661.31%*48,674368Has raised £51m from investors including Google Ventures
69GiacomCloud services providerHullJul-1660.73%6,62950Its MessageStream platform is used by more than 4,000 software resellers
70LPW TechnologyMetal powder manufacturerCheshireAug-1660.69%†10,40682Investing £20m over two years to develop its manufacturing facilities and product range
71Prepaid Financial ServicesPayment services providerCentral LondonDec-1659.05%41,84348Its prepaid cards are used by governments, multinational companies and individuals
72CroudDigital marketing agencyEast LondonMar-1758.75%*7,71483Employs more than 1,200 digital marketing experts, or ‘Croudies’, around the world
73Milk Visual EffectsVisual effects developerCentral LondonMar-1757.94%*10,273109Co-founder Sara Bennett won an Oscar for creating visual effects used in the film Ex Machina
74The Media ImageDigital marketing agencySouth LondonFeb-1756.77%*18,39833Founded by the man who was the first recruit for Google UK's Adwords
75IpsotekVideo analytics providerWest LondonDec-1655.92%*5,06241Its patented software analyses CCTV footage to identify security threats
76Bede GamingGambling software developerNewcastleDec-1654.41%*8,157120Employs 120 developers at its offices in Newcastle, London and Sofia, Bulgaria
77MediatonicComputer games developerCentral LondonSep-1653.77%*7,367110Worked with Warner Bros to create a mobile game for Harry Potter prequel Fantastic Beasts
78InfoMediaMobile payment providerNorthamptonOct-1652.34%*34,02030Last year it processed 40m payments for customers' mobile phone bills
79M Squared LasersLaser designer and manufacturerGlasgowFeb-1652.13%*13,89690Its advanced laser systems are used by Nobel prize-winning scientists
80Kimble ApplicationsSoftware developerCentral LondonDec-1650.60%*5,20641Set up by serial entrepreneurs with backing from 30 angel investors
81Infectious MediaAdvertising software developerCentral LondonMar-1750.53%*45,177101Helps customers including Adidas and Expedia convert ad views to sales
82NewVoiceMediaContact centre software developerBasingstokeJan-1750.18%*32,204370Has raised more than £100m from investors including BGF Ventures
83ActiveQuotePrice comparison websiteCardiffSep-1649.02%*7,598129Its technology is used by other websites such as Gocompare and uSwitch
84BrandwatchSocial media monitoringBrightonDec-1648.96%29,100354Says it collects 200m online data points every day
85LystFashion search platformEast LondonMar-1748.66%*10,538120Has raised £39m from technology investors including Accel Partners and Balderton
86Godel TechnologiesSoftware developerManchesterDec-1648.65%*9,052350Is named after the late German mathematician Kurt Gödel
87PrivateFlyOnline private jet hireSt AlbansMay-1748.38%*22,25931Opened an office in Fort Lauderdale last year to serve the growing American market
88SpektrixTicketing software supplierCentral LondonDec-1648.04%*5,15265Processed sales of more than 15m theatre tickets in 2016
89ChameleonSmart energy monitoringHarrogateDec-1647.97%*10,86021Almost 2m of its energy display units have been installed in UK homes
90Bullitt GroupConsumer electronics designerReadingDec-1646.86%*99,67398Sells its branded electronics to more than 70 countries
91Lineup SystemsAdvertising technology developerCentral LondonJun-1646.16%*7,28585Its software comes in 21 languages and has 8,000 users across 33 countries
92RatioPrice comparison websiteBournemouthApr-1746.11%*8,75622Its diverse services range from a price comparison site to an underwear subscription club
93SaleCycleMarketing technology developerTyne and WearMar-1745.85%*12,034154It has helped companies such as Virgin Atlantic increase online sales by more than 5%
94FeefoCustomer review platformHampshireMar-1745.07%*8,090100More than 3,500 brands use Feefo to collect reliable customer feedback
95DianomiContent marketing servicesCentral LondonDec-1644.24%*8,70222Its technology places more than 3.5bn ads each month on financial news websites
96MVFDigital marketing agencyNorth LondonMar-1744.06%*54,257319In February it acquired publisher Startups.co.uk for an undisclosed sum
97Know Your MoneyPrice comparison websiteNorwichMar-1743.94%*8,36917Its three co-founders launched the business in 2004 with a £5,000 credit-card loan
98Edge Testing SolutionsSoftware testing providerGlasgowDec-1642.46%10,09991Offers two hubs for its clients to test their products before launch
99M24SevenInternet services providerManchesterMar-1742.43%*33,555217Acquired internet infrastructure and hosting firm M247 for £47.5m last October
100CV-Library HoldingsOnline job siteHampshireJun-1642.03%25,186132Stores nearly 12m CVs on its website

* supplied by company   annualised figure