Rank Company Location Year end Annual sales rise over 3 years Latest sales £000s Staff Comment
1 MVFDigital marketing services North London Mar 13 277.88% *13,864 125 Its marketing platform helps its clients reach new customers in more than 50 countries
2 Switch ConceptsAdvertising software developer Southampton Apr 13 268.56% *14,519 52 Places over 1 billion adverts each day for customers in more than 20 countries
3 Quintessential Finance GroupFinancial technology services Macclesfield Mar 13 259.76% *34,367 88 Plans to launch a price comparison site for life insurance customers this year
4 SPEX GroupOil & gas technology developer Aberdeen Dec 12 259.41% 13,935 80 Recently won a multi-million pound contract with Shell to design an innovative subsea tool
5 MobileWebAdzMobile advertising provider Central London Mar 13 220.19% *20,444 60 Targeting growing numbers of mobile phone users in emerging markets has boosted revenues
6 Zoopla Property GroupProperty websites operator Central London Sep 12 213.64% †35,792 145 Is reported to be looking at a stock market flotation for more than £1bn
7 PaymentSensePayment processing services Central London Mar 13 197.70% *12,354 476 30,000 small businesses in the UK use this firm's credit card processing service
8 Equal ExpertsSoftware developer Central London Mar 13 195.09% *13,499 140 Is using its private sector experience to help the UK government roll out its digital strategy
9 Active SecuritiesOnline finance provider Central London Mar 13 194.56% *8,942 44 Is expanding into Canada, New Zealand, Spain and Poland
10 Mind CandyChildren's games developer Central London Dec 12 190.05% *46,893 234 Has over 80m registered players and plans to launch an animated Moshi Monsters series
11 We Are SocialSocial media marketing agency Central London Jun 12 185.97% 10,140 350 In five years it has grown headcount from 2 to 350, and it has staff in 8 countries
12 E-LeatherEco-friendly materials developer Peterborough Apr 12 180.77% 6,962 102 Saving weight, airlines use less fuel and recover the cost of using E-Leather
13 AlertMeSmart home monitoring provider Central London Dec 12 169.52% *13,610 92 Has raised over £23m in venture capital since it was founded in 2006
14 Mansion House ConsultingIT consultancy Central London Jan 13 160.43% 12,017 20 Has offices in Frankfurt, New York and Singapore
15 LMAX Exchangee-FX trading technology West London Apr 13 160.27% *†5,554 95 Captured a 1% share in one of the fastest growing segments of the $5tn daily global FX market
16 Wonga.comOnline money lender Central London Dec 12 155.15% *309,290 432 Has made over 7m loans in six years
17 Infectious MediaDigital advertising software developer Central London Apr 13 151.32% 13,429 45 Buys more than 2 billion ad spaces each month
18 Tech21Device impact protection maker Southwest London May 13 147.12% *16,923 35 Uses specialised materials, including a polymer used in bullet proof glass
19 R-Com ConsultingIT consultancy Greater Manchester Dec 12 130.00% *5,119 25 Customers include Play.com, Cardiff University and The Royal Mint
20 APSUIT services provider Cirencester Jun 12 129.43% 25,584 75 Customers include Aldi, Primark and IBM
21 Bowman PowerElectrical turbogenerator developer Southampton Dec 12 127.65% 9,266 62 Over 99% of its heat recovery systems are exported
22 MedicAnimalOnline pet products retailer Northwest London Dec 12 127.48% *47,264 300 Its websites offer live chat facilities with vets in five languages
23 Prepaid Financial ServicesPayment services provider Central London Dec 12 121.33% *6,170 23 Its technology is used by 750,000 cardholders in more than 100 countries
24 Invenio Business SolutionsIT consultancy Reading Mar 13 117.98% *7,530 65 Maldives residents can now submit online tax returns thanks to Invenio
25 Gill Research & DevelopmentElectronic systems developer Hampshire Jul 12 117.22% 24,507 80 New contracts overseas boosted sales last year
26 Infinity SDCDatacentre services provider Central London Mar 13 116.70% *16,680 67 Is opening a datacentre in offices used by the press and media during the London Olympics
27 Intelligent EnergyPower systems developer Loughborough Sep 12 112.92% 43,852 282 Recently raised £22m to help it increase the pace of product commercialisation
28 SkyscannerTravel search engine Edinburgh Dec 12 110.77% 33,479 158 Generated £3.5bn in ticket sales for airlines last year
29 InfracastMobile messaging provider Berkshire May 13 103.64% *5,769 25 Handles more than 50m text messages each month
30 EssenceDigital marketing agency Central London Mar 13 97.69% *148,067 278 Has offices in New York, Seattle, San Francisco and Singapore
31 AvectoIT security software developer Cheshire Jun 13 96.54% *6,700 59 Avecto is fully integrated with McAfee's security software
32 MaxymiserOnline customer experience optimisation Central London Dec 12 94.07% *9,634 200 Maxymiser has moved its headquarters to New York as sales grow in the US
33 Virtual1Network services provider Central London Mar 13 93.34% *6,473 37 Plans to make acquisitions to fuel future growth
34 Peach TelecomTelecoms services provider Hampshire Aug 12 92.55% 8,118 72 Works with BT, NEC, O2, TalkTalk and Siemens
35 Qube GBCommunications services provider Scottish Borders Mar 13 92.10% *17,114 434 Does more than 600,000 TV, phone and broadband installations each year
36 TBGSocial media agency Central London Dec 12 88.01% *68,269 140 Delivers social media ad campaigns for global brands, including Dell and Heineken
37 4SLData-backup services provider Central London Mar 13 86.31% *6,029 28 Customers include BP, Investec and Thames Water
38 WEMS InternationalEnergy management services Stockport Jul 12 79.88% 12,204 78 Its systems can help businesses reduce energy costs by up to 30%
39 ApicalImaging technology developer Central London Mar 13 79.77% *8,292 39 Has more than doubled its technical team from 20 to 45 people in the last year
40 m-hanceSoftware provider Stockport Dec 12 79.25% *18,090 192 Has opened an office in Boston and has a development team in India
41 AcademiaEducational IT consultancy North London Jun 12 78.80% 31,115 51 Its proprietary ordering software dovetails with customers’ procurement systems
42 FarncombeDigital television consultancy Basingstoke Dec 12 76.15% *8,547 48 Clients include eight of the top ten EU pay-TV operators
43 MOFILMCrowdsourcing advertising agency Central London Sep 12 76.10% *5,368 23 Jon Landau, producer of the world's biggest grossing film, Avatar, is on Mofilm's board
44 The Test PeopleSoftware testing provider Leeds Mar 13 76.03% *5,766 92 The two founders split the business four-ways to attract top technical talent
45 TextlocalBusiness mobile messaging Chester Nov 12 74.91% *5,482 20 Helps more than 100,000 businesses send text message alerts, confirmations and promotions
46 SiracomWireless systems consultancy Basingstoke Dec 12 74.85% *16,352 20 Over 2,500 schools and universities use Siracom's wifi systems
47 Evance Wind TurbinesWind turbine developer Loughborough Mar 13 73.81% *8,591 38 Its 1,600 turbines produce 18,200MWh of energy a year
48 CamSemiEnergy-saving chip developer Cambridge Dec 12 69.92% *9,704 59 Has shipped over 450m power-saving chips
49 Oxford ImmunotecMedical diagnostics provider Abingdon Dec 12 69.63% 13,403 131 Sells its tuberculosis diagnosis product to hospitals in over 40 countries
50 InSkin MediaAdvertising technology provider Central London Dec 12 69.11% *7,646 37 More than 100 websites, including Channel 4 and The Telegraph, use its technology
51 Click TravelTravel management system developer Birmingham Mar 13 68.53% *48,850 76 Customers include TalkTalk, Adecco and Caffé Nero
52 Nomad DigitalTransport communications provider Newcastle Jun 12 67.44% 24,388 116 Used by Heathrow Express, Amtrak, the Dubai Metro, Eurostar, Queensland Rail and Virgin Trains
53 KeytreeDigital IT services Central London Aug 12 66.50% *8,765 77 Won SAP's Innovation Partner of the Year award in 2011, 2012 and 2013
54 BlockIT consultancy Central London Mar 13 65.73% 22,865 73 Says its customer retention rate is over 92%
55 GGMRDigital marketing agency Wiltshire Oct 12 65.04% *5,125 15 Worked with The Duchess of Cambridge on the Royal Foundation website
56 The BIO AgencyDigital advertising agency Central London Apr 13 62.73% *7,984 95 Has an office in Austin, Texas, where Facebook and Twitter have a big presence.
57 PulsantIT services provider Reading Dec 12 62.06% 30,433 132 Has acquired two former Tech Track 100 companies since founding in 2010
58 Forward Internet GroupMedia developer and investor Central London Dec 12 58.65% *202,885 460 Invests in web businesses, including pricing comparison site uSwitch which it sold last month
59 LivebookingsRestaurant reservation service Central London Dec 12 58.47% 8,902 165 Processed more than 18m bookings in Europe in 2012 with 25m planned for 2013
60 Ocean OutdoorDigital advertising developer Central London Dec 12 57.41% *23,388 21 Advertising wrapping round the iMax near Waterloo station costs customers £200k for two weeks
61 PMGC Technology GroupIT and telecoms services provider Central London May 13 56.39% *17,978 83 Its technology enables directors and cast to make script changes on tablets during play rehearsals
62 BCSGIT consultancy Central London Jul 12 56.09% 8,081 100 Has helped more than 150,000 small businesses select and integrate software products
63 M247Internet infrastructure provider Manchester Apr 13 55.81% *7,704 38 Says its Manchester datacentres are among the most energy efficient in Europe
64 eCommeraeCommerce services provider Central London Mar 13 55.58% *26,337 335 Supports 130 e-commerce sites for customers across 29 countries
65 MooOnline stationer Central London Dec 12 55.49% 20,233 107 Last year it acquired personal identity web platform flavors.me
66 AyimaSearch optimisation consultancy Central London Dec 12 54.35% *6,661 30 Has opened three offices in North America
67 Simplify DigitalProduct comparison software developer West London Jan 13 53.69% *7,064 43 Helps consumers find the best deal for broadband, digital TV and phoneline packages
68 XexecReward programmes administrator Northwest London Nov 12 52.73% *21,986 45 Recently launched an app that maps the employee's location to find discounts nearby
69 UkashOnline payment provider Central London May 13 52.71% *26,125 104 Has customers in 58 countries
70 NanoSightScientific instrument manufacturer Wiltshire Dec 12 52.23% 5,679 35 Can count particles too small for an optical microscope
71 CertecoIT consultancy Central London Jun 13 52.02% *14,330 197 Acts for large banks and insurers, including Lloyds and Barclays
72 VisualsoftWebsite developer Stockton-on-Tees Jun 13 50.77% *5,371 135 Has almost 1,000 customers and plans to double sales by growing its headcount
73 ULS GroupHouse-buying software developer Oxfordshire Mar 13 50.23% 10,590 47 Plans to compare fees charged by solicitors for a divorce in 2014
74 7digitalDigital music platform Central London Dec 12 49.87% *11,306 99 Has a database of more than 25 million songs
75 GCI Telecom GroupTelecoms services provider Lincoln Dec 12 48.98% *55,000 229 Has a data storage facility in a nuclear bunker under 16m of concrete
76 TuskerEmployee rewards software developer Hertfordshire Dec 12 48.60% 46,602 54 Spends £1m annually on software development
77 XceedIT management consultancy Central London Nov 12 48.50% 16,343 58 Recent retail bank reorganisations have boosted sales
78 DynmarkMobile communications provider Cheltenham Dec 12 47.65% 6,208 31 Sends marketing texts to consumers in more than 150 countries
79 MimecastEmail management services provider Central London Mar 13 47.37% *42,677 388 Raised £40m last year to fund new technology and expansion in America
80 XConnectTelecoms services provider North London Dec 12 46.93% *11,006 41 Its electronic number mapping registry held 2.2 billion phone numbers at the end of 2012
81 FluidataInternet services provider Central London Mar 13 46.91% 10,021 47 There are now 50 ISPs connected to its network
82 Cygnet GroupSpecialist engineer Northwich Nov 12 46.50% 22,804 97 Develops, manufactures and assembles all its products in Britain
83 BarrachdSoftware developer Edinburgh Jan 13 45.85% *6,799 35 Sells software that can monitor staff absenteeism and sentiments in social media
84 AppSenseSoftware developer Warrington Jun 12 45.53% 56,170 385 Recently established a Paris office and a French website
85 PurdicomWireless network provider Oxfordshire Dec 12 44.91% *9,184 22 Benefited from government funding to roll out wifi in market towns and villages
86 The Hut GroupOnline retailer Northwich Dec 12 44.32% 157,187 485 Reportedly planning a stock market listing later this year
87 SMDSubsea engineering specialist Newcastle Dec 12 43.84% *128,757 495 60% of sales are international, predominantly in Japan, China and Brazil
88 ShazamContent recognition services Central London Jun 12 43.78% 21,807 143 Users of the Shazam phone app topped 350m this year
89 Camlin GroupTransport power systems developer County Antrim Dec 12 43.49% *9,740 140 Has five overseas offices and is opening further bases in Czech Republic, Brazil and Russia
90 EmpoweredIT services provider Bedfordshire May 13 43.40% *5,008 25 Has been working on the integration of T-Mobile and Orange mobile systems
91 Olive Business SolutionsTelecoms services provider High Wycombe Jan 13 43.39% *11,940 58 Works for big construction clients, such as Mace and Keltbray
92 The FoundrySoftware developer Central London Dec 12 42.77% *19,814 230 Merged with US 3D special effects software company Luxology
93 itmsoilGeotechnical monitoring services Sussex Dec 12 42.68% 25,541 151 Its instrumentation is being used by Crossrail - Europe's largest civil engineering project
94 AgilityWorksIT consultancy Oxford Nov 12 42.66% *5,957 50 Plans to open overseas offices to win new customers
95 Focus GroupTelecoms services provider East Sussex Nov 12 42.61% *17,274 85 Has 6,000 business customers
96 dB BroadcastBroadcast systems integration Cambridgeshire Sep 12 42.21% 23,050 54 Customers include the BBC, Sky and Arqiva
97 Audio NetworkOnline music publisher Central London Jun 13 41.92% *12,334 67 Has launched a Japanese website this year
98 ECO PlasticsPlastic bottle recycler Lincolnshire Dec 12 41.90% *38,459 179 Its joint venture PET recycling plant with Coca-Cola has recycled 500m bottles since opening in 2012
99 HatstandFinancial IT consultancy Central London May 12 41.80% 9,074 81 Its customers span financial centres in Europe, North America and the Asia Pacific
100 ActivInstinctAffiliate marketer Northwest London Aug 12 41.75% *15,513 75 Plans to grow its footprint in Europe and win business globally

* supplied by company   annualised figure