Rank Company Location Year end Annual sales rise over 3 years Latest sales £000s Staff Comment
1 RevolutDigital banking services provider East London Dec 18 507.56% *58,300 700 Valued at $1.7bn in 2018 and reported to be raising an additional $500m this year that could value it at $5bn
2 BizumaB2B e-commerce platform Central London Mar 19 315.18% *26,414 114 Connects wholesale buyers and sellers from over 50 countries
3 Global-eCross-border ecommerce solutions Central London Dec 18 303.09% 29,297 28 Its technology helps ecommerce retailers localise their websites in more than 200 markets
4 Jungle CreationsSocial media & ecommerce services East London Dec 18 302.53% *15,972 159 Launched the first-ever delivery-only restaurant born from social media
5 Oxford Nanopore TechnologiesDNA analysis technology Oxford Dec 18 251.87% *32,500 439 Has raised £451m in funding and was valued at £1.5bn last year
6 LendableConsumer lending platform Central London Dec 18 242.98% *19,366 44 Founder moved to the UK from Germany to start the firm, citing a more favourable financial market
7 VerveMarketing software developer Central London Dec 18 235.72% *21,940 230 Has implemented full salary transparency in order to combat the gender pay gap
8 OnfidoIdentity verification software Central London Dec 18 209.15% *18,591 240 Has opened offices in the US, Europe, India and Singapore to service its 1,500 customers
9 Reverse Media GroupDigital publishing agency Central London Jul 18 208.10% *7,606 15 Originally started as an animal onesie clothing company before pivoting to online publishing
10 Rebound ReturnsEcommerce returns technology Telford Dec 18 191.08% *16,659 21 Its platform handles more than 35m online returns transactions every year
11 ClearScoreCredit-checking technology developer South London Dec 18 177.20% *42,702 135 In 2018, £90m worth of mortgages were secured through its site
12 SPOKEOnline menswear supplier Richmond Oct 18 177.10% *5,566 36 Its technology helps customers find the right fit out of 200 clothing size options in just 60 seconds
13 FSBGambling platform Central London Dec 18 175.54% *23,945 93 Has moved into William Hill's old R&D offices in Shoreditch
14 DecibelCustomer experience technology Central London Jun 18 165.81% 5,387 68 Uses AI and machine learning to detect consumers’ feelings of confusion, frustration and engagement
15 Miss GroupWeb hosting provider Manchester Dec 18 162.06% *6,925 55 Has made four acquisitions in the last year, with £19.4m investment from growth-capital firm BGF
16 ComplyAdvantageAnti-money laundering database Central London Mar 19 160.61% *5,981 165 Its platform helps 450 customers in 45 countries address compliance issues
17 OTA InsightHospitality technology provider Central London Dec 18 158.14% *10,295 105 Works with over 40,000 hotels in 126 countries, including some of the world's largest hotel groups
18 Light SourceTelecoms infrastructure builder Nottinghamshire Mar 18 146.90% 31,098 96 Developing a pneumatic rocket launcher that can lay fibre cable 500m from its launch site
19 Digi2alDigital technology developer Central London Jan 19 141.56% *14,394 11 Called Digi2al because its software development team works in two-week sprints
20 PerkboxEmployee engagement services Central London Dec 18 131.50% *53,600 250 Raised £13.5m in April to boost its expansion in Australia and France
21 Lending WorksPeer-to-peer lender Central London Dec 18 128.54% *6,178 42 Aiming to reach £1bn in loan volume by 2023
22 FacultyAI software developer Central London Mar 19 125.91% *5,193 65 Has worked on more than 300 AI projects for clients including easyJet, Tesco and the BBC
23 Internet Mobile CommunicationsTelecoms services provider Chelmsford Jun 19 122.54% *60,241 32 Has offices in Chile and Moldova as well as its Essex headquarters
24 FruugoOnline shopping platform Cumbria Dec 18 116.00% *6,661 35 Its site has been used by 2m shoppers in 17 languages and 32 countries
25 FeaturespaceAnalytics software developer Cambridge Dec 18 110.71% *9,953 200 Its anti-fraud technology is used by 19 banks across Europe, the US and Latin America
26 MonterosaAudience interaction platform Central London Mar 19 109.56% *10,099 72 Its apps for clients including ITV, EA Sports and Nickelodeon have engaged 60m fans in 190 countries
27 Lockwood PublishingMobile games developer Nottingham Mar 19 107.97% *17,950 110 Creates mobile video games where users can customise their avatar with its own line of evening wear
28 Plan.comCommunications provider Isle of Man Sep 18 107.83% *47,881 96 About 650 partners use its telecoms platform to support more than 100,000 UK business customers
29 Capital on TapBusiness finance provider Central London Mar 19 100.45% *39,285 73 Has lent over £1bn to more than 80,000 businesses across the UK
30 In Touch NetworksProfessional networking platform Manchester Feb 19 98.10% *7,428 139 Its platform helps more than 125,000 members access training and find new roles
31 DV SignageCorporate AV specialist Hertfordshire Mar 18 97.82% *5,150 25 Has developed a robot receptionist capable of welcoming guests and giving presentations
32 OguryMobile data marketing East London Dec 18 97.77% 62,318 210 Services clients including eBay, Nike and McDonald's from 13 offices in Europe, the US and Mexico
33 Chameleon TechnologySmart energy monitoring Harrogate Dec 18 97.59% *21,752 46 More than 4m of its smart in-home displays have been installed in UK homes
34 iwocaBusiness finance provider Central London Dec 18 97.06% *47,534 230 Has raised £352.7m to date, including a £150m funding round in February
35 ByteMarketing technology agency Central London Dec 18 95.79% *18,315 96 3.6m people played an augmented reality rugby game it created for Just Eat
36 MatillionData transformation software Altrincham Dec 18 94.13% *6,504 87 Has around 600 customers, including GE, Siemens and Amazon, across 40 countries
37 Bought By ManySpecialist insurance platform Central London Mar 19 93.91% *35,000 101 Launched in Sweden this year, its first overseas market for its pet insurance
38 Checkout.comPayment services provider Central London Dec 18 93.34% *55,713 450 Raised $230m in May, the highest early-stage funding round for a fintech company in Europe
39 FleximizeBusiness finance provider Ipswich Aug 18 92.54% *8,291 40 Has provided over £100m in loans to small businesses across the UK
40 Hyperdrive InnovationBattery technology developer Sunderland Mar 19 90.00% *7,286 40 Can produce up to 30,000 battery systems a year at its Sunderland production facility
41 GoCardlessPayment services provider Central London Dec 18 89.93% *20,133 264 Processes $10bn of payments a year on behalf of 40,000 businesses worldwide
42 Azuri TechnologiesSolar technology developer Cambridge Dec 18 89.85% *8,837 80 Over 750,000 people in 12 sub-Saharan countries use its solar power systems
43 Receipt BankBookkeeping automation services Central London Dec 18 89.78% *18,619 445 250,000 businesses in America, Europe and Australia use its book-keeping software
44 gohenryChildren's pre-paid card service Central London Dec 18 88.25% *8,309 96 The company is named after the first child to make a transaction with one of its cards
45 GoustoMeal kit delivery services West London Dec 18 87.68% *49,284 371 On track to provide the ingredients for 400m meals in UK homes by 2025
46 DepopFashion marketplace app Central London Dec 18 87.48% *171,989 159 More than 15m people use its platform to buy and sell second-hand clothing
47 GiacomCloud services provider Hull Jul 18 87.43% 25,104 58 Founded in 1999, the firm is celebrating its 20th anniversary this year
48 Account TechnologiesConsumer finance provider Buckinghamshire Aug 18 87.39% 68,212 152 Has attracted 470,000 customers and provided £1.5bn in loans since launch in 2012
49 GigaclearInternet services provider Oxfordshire Dec 18 87.19% 8,979 240 Has connected more than 19,000 rural customers to broadband across the UK
50 OakbrookConsumer finance provider Nottingham Dec 18 86.86% 53,250 103 Uses machine learning to help estimate borrowers’ credit risk
51 HyperopticInternet services provider West London Dec 18 86.60% *26,900 667 Aims to provide superfast broadband to more than 2m homes by 2022
52 TransferWiseCurrency transfer provider East London Mar 19 85.96% *179,100 1,516 Was valued at $3.5bn in November after it raised $292m, taking its funding total to $689m
53 Assetz CapitalBusiness finance provider Manchester Mar 19 85.77% *16,991 99 Its 35,000 lenders have earned over £80m in interest, and funded £800m of loans and 4,000 new homes
54 DarktraceCyber-security developer Cambridge Jun 19 84.73% *107,664 948 Was reportedly valued at $1.65bn in 2018 following a $50m funding round
55 PayenPayment services provider Guildford Mar 19 80.58% *14,211 32 The Premier Lotto in Nigeria uses the company’s platform to prevent money laundering
56 ThreadOnline fashion services Central London Dec 18 80.22% *8,137 65 Has named its AI-driven personal stylist software "Thimble"
57 SuperAwesomeChildren's privacy protection Central London Dec 18 79.00% *26,200 120 High-profile customers include Disney, Nintendo, Hasbro and Cartoon Network
58 VizolutionBusiness software developer Swansea Dec 18 77.76% *10,234 154 Its software powers RBS’s paperless mortgage process which completes over £18bn of lending each year
59 BigChangeWorkforce management software Leeds Dec 18 77.44% *11,206 98 Its CEO has pledged to move the company to a four-day working week by 2021
60 SymetricaDetection equipment manufacturer Southampton Sep 18 74.24% 11,019 59 Its technology is used at ports across the world to detect radioactive material used in bombs
61 StarLeafVideo conferencing platform Watford Dec 18 73.53% *17,600 201 Its founders set up the Tech Track 100 alumnus Codian and sold it for $270m in 2007
62 AzimoCurrency transfer provider Central London Jun 18 72.44% 10,776 120 Enables users to transfer money to more than 200 countries in 80 currencies
63 EndomagMedical device developer Cambridge Dec 18 72.36% *6,284 20 Its breast tumour detection technology is used in cancer hospitals such as The Royal Marsden
64 QHi GroupMonitoring systems developer Hertfordshire Mar 19 71.02% *5,102 15 Has opened a US office on Wall Street to service its clients in North America
65 Threads StylingOnline fashion services East London Dec 18 69.84% *17,732 91 Raised £15.7m from Highland Europe and millennial services-focused fund C Ventures in 2018
66 Unify CommunicationsCustomer service software Bristol Aug 18 69.33% *5,735 21 Its software created operational savings in excess of £2m per year for Shell Energy
67 MiQDigital marketing agency Central London Dec 18 68.48% *196,869 570 Operates globally from 15 offices in North America, Europe and Asia Pacific
68 NeyberPersonal finance technology developer Central London Mar 19 66.99% *5,700 121 Co-founder's business idea was inspired by a 'Sou-Sou', an African savings club used by his mother
69 TVSquaredTV advertising analytics Edinburgh Dec 18 66.86% *7,187 93 Tracks 175m website hits per day for over 700 brands, agencies and networks
70 The Access GroupBusiness software developer Central London Jun 18 66.83% 143,135 1,332 It was valued at £1bn last year after an undisclosed investment from HgCapital
71 ContactEngineConversational AI technology Central London Oct 18 66.34% *6,684 57 Has an AI advisory board, chaired by a former UK government chief scientific adviser
72 HutchMobile games developer Central London Sep 18 65.97% *11,585 68 Has secured a worldwide partnership with Formula 1 to create racing games for iOS and Android
73 SideshowDigital marketing agency Bournemouth Mar 19 65.93% *21,744 180 Works with clients including KFC, BT and Tesco to improve customer experience
74 OptalPayment services provider Central London Dec 18 65.90% *269,640 75 Uses the Mastercard processing network to facilitate payments in 34 currencies
75 Leisure Pass GroupTourism smartcard provider Central London Dec 18 62.95% *276,790 121 Its technology processes more than 16m visits a year to sightseeing destinations worldwide
76 Brompton TechnologyVideo technology provider West London Aug 18 61.86% *7,202 30 Musicians Drake and Ed Sheeran have used its equipment on their international tours
77 iPlatoHealthcare app developer Central London Dec 18 61.24% *5,450 62 Its myGP app is used to order one repeat prescription every minute
78 CurrencycloudPayment services provider East London Dec 18 60.87% *20,351 190 Has processed more than $50bn in payments to over 180 countries
79 TharsusRobot designer and manufacturer Northumberland Nov 18 60.85% 51,178 264 Manufactures robots that pick and carry groceries at Ocado's automated warehouses
80 ENSEKEnergy software developer Nottingham Mar 19 60.80% *8,677 129 Counts the former managing director of British Gas, Ian Peters, as its chairman
81 CaptifyAdvertising technology company Central London Mar 19 58.86% *43,048 197 Provides data and marketing insights for over 800 brands including Disney, Apple and Adidas
82 AdaptiveBanking technology developer Central London Jun 19 58.56% *28,151 214 Has more than 200 staff across offices in London, Barcelona, Montreal and New York
83 Student BeansStudent loyalty network Central London Jun 19 57.62% *7,106 107 Says it helped students save on 72,856 mobile phones and 539,214 pairs of shoes in 12 months
84 Godel TechnologiesSoftware developer Manchester Dec 18 57.21% *21,711 732 Is named after the late German mathematician Kurt Gödel
85 MPBPhotography equipment trading platform Brighton Mar 19 56.21% *31,909 125 Building an operational centre in New York to service its US customers
86 SmartsearchAnti-fraud technology developer Leeds Dec 18 56.21% 8,129 82 Its anti-money laundering services are used by more than 4,000 client firms and 40,000 users around the world
87 LiberisBusiness finance provider West London Dec 18 56.07% *21,090 105 Its intelligent pricing tool uses machine learning to give customers bespoke pricing
88 cloudThingSoftware developer West Midlands Jan 19 55.84% *6,056 41 Delivers IT transformation projects for the British Red Cross and Metropolitan Police
89 ZappiConsumer insights platform Central London Dec 18 55.19% 24,760 189 Holds weekly hackathons with its clients and programmers
90 TicketerElectronic ticket machine developer Hungerford Aug 18 53.83% 14,692 55 Over 2 billion tickets have been purchased via its electronic ticketing machines
91 Pharmacy 2UOnline pharmacy Leeds Mar 19 53.02% *61,022 299 Uses proprietary algorithms and warehouse automation to increase accuracy in medicine dispensing
92 AdaptavistIT consultancy Central London Sep 18 52.46% *26,704 162 Says it works with more than half of Fortune 500 companies
93 Alternative AirlinesFlight booking website Surrey Oct 18 51.49% *9,985 30 Offers mobile payment solutions for customers from developing countries
94 Biosite SystemsWorkforce management software Solihull Jul 18 51.33% 9,756 165 Its technology is used on 1,000 construction sites, including Hinkley Point C nuclear power station
95 JustParkSmart parking provider North London Mar 19 50.70% *24,285 70 Over 3m drivers use its app to find car parking spaces across the UK
96 WorldRemitCurrency transfer provider Central London Dec 18 50.26% *90,965 615 Is valued at more than $900m, having raised more than $375m since 2010
97 E3D Online3D printer developer Oxfordshire Apr 19 50.10% *6,900 41 Has grown its exports to account for 75% of its total sales
98 ParentpaySchool payment services provider Coventry Nov 18 49.97% *30,400 210 Bought Dutch rival WIS in 2018, gaining access to 85% of the secondary school market in the Netherlands
99 VictorOnline private jet hire Central London Dec 18 49.56% *55,100 100 Counts Sir Elton John among its investors
100 DianomiFinancial marketing platform Central London Dec 18 49.21% *14,615 27 Works with eight of the top 10 global asset managers

* supplied by company  † annualised figure