Rank Company Location Year end Annual sales rise over 3 years Latest sales £000s Staff Comment
1 Wonga.comOnline money lender Central London Dec 10 361.29% 73,817 47 Made 830,000 loans in 2010, a fivefold increase on the previous year
2 Reward GatewayEmployee engagement technology provider Central London Jun 11 266.52% *81,374 79 Provides perks such as retail discounts to more than 1m employees
3 musicMagpie.co.ukOnline entertainment trader Cheshire May 11 205.21% *30,774 350 Offers 16 new football kits in exchange for 400 old CDs or DVDs
4 FixnetixFinancial trading services provider Central London Mar 11 191.13% 25,375 83 Its technology can execute a trade in less than a millionth of a second
5 XConnectTelecoms services provider North London Dec 10 171.68% *7,135 47 Raised £13.5m funding from investors including Accel Partners
6 I SpyDigital marketing agency Central London Dec 10 169.63% 9,068 41 Advises cosmetics retailer Avon on its social networking activity
7 TelemetryOnline video delivery and analysis Central London May 11 168.54% *22,726 54 Founders are seeking equity finance to fund an aggressive growth strategy
8 The Hut GroupOnline retailer Northwich Dec 10 141.62% *85,351 264 Sells more than 1m different products across its websites
9 Peach TelecomTelecoms services provider Hampshire Aug 10 137.36% 7,125 54 Has grown by swallowing up smaller competitors
10 Smart TrafficDigital marketing agency Bristol Mar 11 129.36% 5,762 181 Has more than 100 technicians working on search engine optimisation
11 Nomad DigitalTransport communications provider Newcastle Jun 10 125.55% 8,616 59 Investors include T-Mobile’s venture fund
12 CertecoIT consultancy Central London Jun 11 117.86% *10,718 117 Plans to launch an IT testing centre in the UK to compete with overseas rivals
13 Zamir TelecomInternet telecoms provider Central London Nov 10 115.36% *11,009 36 Founder was once a barrister specialising in criminal defence
14 EssenceDigital marketing agency Central London Mar 11 111.09% 74,185 94 Is helping to market a new Harry Potter website
15 Adconion Media GroupDigital advertising distributor Central London Dec 10 110.41% *148,014 459 Raised £40m from a private equity consortium in 2008
16 MimecastEmail management services provider Central London Mar 11 96.79% *20,949 214 Helped the Salvation Army to cut spam levels from 90% to almost zero
17 Gocompare.comPrice comparison website Newport Dec 10 96.72% 101,494 84 Provides 2m insurance quotes a month
18 InnoviseSoftware developer Slough Sep 10 96.34% 17,059 146 Has made 13 acquisitions in seven years
19 SkyscannerTravel search engine Edinburgh May 11 94.23% *15,308 104 More than 2m people have installed its iPhone application
20 memsstarSemiconductor equipment maker Livingston Dec 10 94.08% 8,829 58 Received £2m of funding from Albion Ventures in 2007
21 Workspace TechnologyData centre designer Sutton Coldfield Dec 10 86.69% 7,045 40 Has developed energy-saving airconditioning systems for data centres
22 IxarisOnline payment services provider Central London Dec 10 86.55% 8,476 13 Lets corporate clients design their own virtual credit cards
23 UkashOnline payment provider Central London May 11 84.86% *12,602 39 Generates 80% of revenue overseas after going international five years ago
24 Consumerchoices.co.ukPrice comparison website Central London Mar 11 84.58% *8,233 30 Estimates that its sites receive 1.3m visitors a month
25 We Buy Any CarOnline car trader Rochdale Sep 10 81.99% 315,128 246 Says it buys more than 100,000 cars a year
26 Concentra ConsultingSoftware developer and consultancy Central London Mar 10 80.98% 5,356 76 Its software is used by chemotherapy units to plan allocation of resources
27 TolunaOnline market research provider West London Dec 10 80.79% 73,641 787 Claims its online community generates more than 1m votes a day
28 JUST EATTakeaway website Central London Dec 10 80.10% *18,109 179 Completed an acquisition earlier this year to break into India
29 GameAccount NetworkGaming software developer Central London Dec 10 75.57% *†15,142 44 Claims it processed $1 billion in bets last year
30 Rated PeopleTradespeople recommendation website Central London Dec 10 75.27% 6,853 24 Half a million home improvers use its website each year
31 The FoundrySoftware developer Central London Dec 10 74.30% 13,049 70 Believes Bollywood offers the most potential for sales growth
32 Excelerate TechnologyCommunication technology developer Cardiff Oct 10 72.78% 5,333 31 Facilitates a mobile library service in Northern Ireland
33 AcademiaEducational IT consultancy North London Jun 10 72.49% 10,927 29 Is looking to expand across Europe after recent acquisition in Finland
34 Intelligent EnergyPower systems developer Loughborough Sep 10 72.41% 7,811 134 Has re-engineered planes and motorbikes to use hydrogen fuel cells
35 BlockIT consultancy Central London Mar 11 72.37% 10,694 32 Doubled its headcount in the past year and will open a new office in Cheshire
36 EviivoHospitality software developer Central London Mar 10 70.83% 6,033 78 Has 85 staff of 22 different nationalities
37 Quickstart GlobalIT services provider Central London Dec 10 70.60% *9,892 700 Co-founder Neal Gandhi has started up and sold three other companies
38 Cambridge Broadband NetworksWireless technology developer Cambridge Dec 10 70.56% *27,751 95 Has raised £55m in seven rounds of funding since it was founded in 2000
39 eCommeraeCommerce services provider Central London Mar 11 69.84% *11,999 148 Operates the online store for the London 2012 Olympics
40 BlueGnomeGenetic diagnostics developer Cambridge Dec 10 69.72% 6,759 25 Plans to open offices in America and Singapore
41 Kaspersky LabInternet security software London/Moscow Dec 10 68.55% 299,050 1,622 World’s third-largest vendor of consumer IT security software, according to Gartner
42 ComtactManaged services provider Central London Dec 10 65.28% 6,822 38 Has delivered IT projects on five continents in the past year
43 SkrillOnline payment provider Central London Dec 10 64.69% 57,017 395 Was first e-money issuer to obtain a licence from the Financial Services Authority
44 ShazamContent recognition services Central London Jun 10 63.87% 10,588 57 Its logo recently appeared in a Starbucks advertisement starring Lady Gaga
45 UK2.netInternet services provider Central London Dec 10 62.92% 23,337 175 Underwent a £47m management buyout backed by LDC in April
46 Updata InfrastructureNetwork services provider Reigate Jun 10 62.69% 19,702 46 Has connected 800 Welsh GP surgeries to the internet
47 QiCommTelecoms services provider Middlesex Sep 10 61.44% 93,221 71 Recently formed a partnership with the Chinese telecoms firm ZTE
48 Fourth HospitalityHospitality software developer Central London Aug 10 61.29% 9,893 154 Its software is used in 16 countries, including Russia, Germany and South Africa
49 ACTSmart-card transaction manager Wiltshire Jun 10 59.21% 5,275 73 Claims to process 2.5m transactions a day
50 agenda21Digital media agency Central London Dec 10 59.14% *9,935 36 Analyses links between weather and search engine activity
51 JAOtechTouchscreen terminal maker Surrey Sep 10 56.91% 8,993 36 Is launching an improved, cheaper version of its smart terminal in November
52 C4LData centre services provider Poole Oct 10 56.23% 6,029 33 Founder Mathew Hawkins owns and runs two other IT companies
53 Content and CodeSoftware consultancy Central London Dec 10 56.16% 7,814 105 Demonstrates Microsoft technology to clients before they implement it
54 Wireless LogicWireless data services provider Buckinghamshire Apr 11 55.85% *11,623 18 ECI Partners backed a £35m management buyout from Peter Jones last month
55 ViewSatSatellite communication services provider Guildford Feb 11 54.81% *6,959 17 Works primarily with Middle Eastern and African broadcasters
56 TouchLocalOnline marketer Central London Dec 10 54.33% *9,333 211 Mark Livingstone co-founded Lovefilm.com and was its chief executive
57 Ovation IncentivesReward programme software developer Central London May 11 53.10% *5,072 17 Its online reward and loyalty programmes are available in 47 countries
58 CamwoodApplication migration consultancy Central London Mar 11 51.76% *13,314 65 Plans to open an office in New York by the end of the year
59 KeycomTelecoms services provider Stafford Sep 10 51.48% 6,138 67 Supplies internet connections to military barracks
60 GroundScopeTransportation management provider Southwest London Dec 10 50.53% *8,244 25 Travellers receive text message with driver details 30 minutes before collection
61 RMA ConsultingDigital design consultancy Andover Feb 11 50.50% *5,961 25 Creates visual interfaces, such as flight planning systems for Nato aircraft
62 WorldStoresOnline retailer West London Jan 11 49.80% *22,033 80 Sells 175,000 products for the home and garden, from mattresses to hammocks
63 BallintraeIT consultancy Central London Apr 11 49.42% *5,774 18 Is planning to open offices in New York and Singapore
64 OneComTelecoms services provider Hampshire Dec 10 49.33% *11,229 84 Won the 2011 award for Vodafone Platinum Partner of the Year
65 MDSLTechnology expense manager Tunbridge Wells Dec 10 49.21% 8,986 98 Has offices in New York, Macau, Hong Kong and Tokyo
66 ControlCircleIT services provider Central London Sep 10 48.11% 13,253 80 Secured £6m growth capital from Scottish Equity Partners last year
67 bet365Online bookmaker Stoke-on-Trent Mar 11 47.36% *501,413 1,911 Its website is available in 17 languages, including Greek, Slovak and Chinese
68 CitihubIT consultancy Central London Dec 10 46.96% *10,103 90 Is benefitting from the release of pent-up demand in the banking sector
69 New Earth SolutionsWaste treatment technologies developer Dorset Jan 11 45.82% 11,103 83 Produces renewable energy from non-recyclable waste
70 FluidataInternet services provider Central London Mar 11 45.34% 5,063 28 Founder started his first company from his bedroom at the age of 15
71 Hermes DatacommsCommunication systems provider Shrewsbury Dec 10 45.26% *17,089 159 Sponsored the Turkmenistan deaf Olympic team in Greco-Roman wrestling
72 DytecnaElectronic designer Weybridge Dec 10 45.06% *40,243 Makes equipment for military vehicles and flight simulators
73 Marlborough CommunicationsMilitary communications provider Surrey Sep 10 44.93% 22,063 30 Supplies equipment to Nato forces in Afghanistan
74 OptaSports information provider Central London Jun 10 44.80% 9,109 133 Covers 30 different sports in 70 countries
75 Media IngenuityOnline lead generator Central London Dec 10 44.63% 10,954 30 Recently launched its own travel insurance and credit card under the Fluid brand
76 UKFastInternet hosting provider Manchester Dec 10 44.50% 12,172 100 Its Manchester data centre has its own electrical substation
77 StickyeyesSearch marketing agency Leeds Mar 10 44.33% 10,384 51 Claims to attract 85m visitors a month to its clients’ websites
78 EtherstackWireless radio software developer Central London Dec 10 44.16% 11,124 53 Spends 20% of its turnover on research and development
79 NMQASoftware testing consultancy Central London Apr 11 43.32% *6,226 53 Worked for Yahoo at its Silicon Valley office
80 Node4Communications services provider Derby Mar 11 42.95% *8,907 45 Founder Andrew Gilbert started the business when he was 23
81 ANS GroupHosting services provider Manchester Mar 11 41.95% *29,423 120 Founded by former child actor Scott Fletcher
82 PowwownowConferencing services provider Richmond Dec 10 41.92% 6,328 52 Broadcasted a 24-hour three-way conference call as a publicity stunt
83 Audio NetworkOnline music publisher Central London Jun 11 41.91% *6,189 41 Has a library of 42,000 music tracks used by television and film producers
84 Orange Information SystemsIT consultancy Central London Mar 11 41.80% *16,826 80 Plans to open first overseas offices in Hong Kong within one year
85 RocelaOracle consultancy Edinburgh Nov 10 40.57% 29,479 45 Company name is an anagram of Oracle
86 Thomsons Online BenefitsEmployee benefits software developer Central London Dec 10 40.51% *23,870 225 Has recently appointed portfolio chairman Nick Discombe to its board
87 Solar CommunicationsCommunication systems provider Wiltshire Dec 10 40.33% 7,533 45 Plans to drive further growth by moving into video-conferencing
88 ECO PlasticsPlastic bottle recycler Lincolnshire Dec 10 40.12% *18,615 130 Recently celebrated recycling its billionth bottle since reopening last November
89 Parcel2go.comDelivery services provider Bolton Mar 11 39.54% *16,937 46 Delivers packages bought by British eBay bidders from sellers in America
90 TIM GroupFinancial software developer Central London Dec 10 39.14% 6,265 65 Its online platform sends 2,000 trading ideas a day to investors
91 XbridgeOnline insurance broker Central London Dec 10 39.05% 16,109 146 Its chief executive previously ran the Match.com dating website
92 VOSSSoftware developer Reading Aug 10 38.27% 5,812 76 Generates 40% of its sales in America
93 Party DelightsOnline party goods retailer Manchester Jun 11 38.14% *9,495 76 Founder Allison Graham has supplied more than 1m parties
94 Mobile Interactive GroupMobile and digital technology provider Central London Apr 10 37.78% 77,846 119 Recently won a contract to run Skype’s global mobile website
95 Red Box RecordersDigital recording technology developer Nottingham Dec 10 37.77% 5,056 43 Records phone and radio conversations for Cambridgeshire Police
96 Onyx GroupIT services provider Stockton-on-Tees Dec 10 37.69% 14,852 114 Helps FTSE 100 companies recover quickly after a catastrophe
97 AdeptraManaged services provider Reading Dec 10 37.39% 21,341 144 Is designing mobile banking apps for smartphones
98 SolarcenturySolar technology developer Central London Mar 11 37.33% 50,316 124 Is building large solar panels across London’s Blackfriars Bridge
99 ClaremontOracle consultancy Newcastle Mar 10 37.11% 8,582 73 Three co-founders used to work for Oracle
100 Elite TelecomTelecoms services provider Lancashire Jul 10 36.79% 17,398 169 Manages call-queuing for Premier League football clubs

* supplied by company  † annualised figure