| A |
| Ace Intl Media Ltd | 45 Albemarle Street, Mayfair | | | |
| Akitanot edited since 2021 | 71-73 Carter Lane, Blackfriars | akita.co.uk | +44 20 7100 7232 | |
| Apriumnot edited since 2021 | Coney Hall, no street on record | | | |
| aurastride | 307 Euston Road, Fitzrovia | aurastride.com | | |
| AVI Systems Limitednot edited since 2018 | 106 St Peter's Street, Croydon | | | |
| Avita Tech Ltd | 1 Clock House Road, Beckenham | avitagroup.co.uk | +44 208 663 0077 | |
| B |
| Badoo HQ | 2 Sheraton Street, Soho | | | |
| Block Solutions Ltdnot edited since 2021 | 14 Shepherdess Walk, Hoxton | block.co.uk | +44 844 967 1646 | |
| C |
| Classroom365 | Iliffe Street, Elephant and Castle | classroom365.co.uk | +44 207 952 5308 | |
| Correct Group | Kentish Town, no street on record | correct-group.co.uk | +44 20 7372 4106 | |
| Cray Housenot edited since 2022 | Foots Cray, no street on record | | | |
| D |
| Datraction | 136 Kingston Road, Merton Park | datraction.co.uk | +44 20 3903 9920 | |
| Durable Digitalnot edited since 2020 | 231,232 Strand, Temple | durabledigital.com | +44 20 7247 5793 | |
| E |
| Ealing Computer Services | Ealing, no street on record | ealingcomputerservices.com | +44 20 8998 5674 | |
| Eposdirect.co.uk | 314 Harrow Road, Wembley | eposdirect.co.uk | +44 871 2022888 | |
| Erlang Solutions Ltdnot edited since 2018 | 14 Gower's Walk, St. George in the East | erlang-solutions.com | +44 20 7456 1020 | |
| Evolfe | 25 Wilton Road, Victoria | evolfe.co.uk | +44 28 7116 4140 | |
| Expert Digital Marketing Ltd | 10-16 Tiller Road, Millwall | edm-uk.com | +44 208 050 0701 | |
| Extent Ltdnot edited since 2020 | 24 High Beeches, Green Street Green | extentsoftware.co.uk | | |
| F |
| FinregE | 1 Canada Square, Canary Wharf | finreg-e.com | +44 20 4537 0860 | |
| G |
| Geeks on Wheels London Ltdnot edited since 2020 | 58-60 Totteridge Lane, Whetstone | geeks-on-wheels.com | +44 20 3051 7977 | |
| H |
| HCL BSERVnot edited since 2018 | Romford, no street on record | | | |
| Hewlett Packard Enterprise | 1 Aldermanbury Square, Moorgate | | | |
| Hotech Ltdnot edited since 2018 | 11 Approach Road, Raynes Park | | +44 20 8544 9321 | |
| HP Return Services | Burford Road, Stratford | | | |
| I |
| IBMnot edited since 2020 | 3 New Square, Bedfont | | | |
| iC Consult UK Ltd. | 2 London Wall Place, Barbican | ic-consult.com | | |
| Infinigate UK Ltdnot edited since 2019 | Arch 8 Chancel Street, Southwark | infinigate.co.uk | +44 845 4900 245 | |
| M |
| Meta | 11-21 Canal Reach, Somers Town | meta.com | | |
| mkodonot edited since 2018 | 27 Paul Street, Finsbury | mkodo.com | | |
| N |
| NearSt | 82 Great Eastern Street, Shoreditch | near.st | | |
| Netcentric UK Ltd.not edited since 2020 | 50 Liverpool Street, Bishopsgate | netcentric.biz | +44 20 3713 7500 | |
| New Vector Ltdnot edited since 2022 | 14 Turnham Green Terrace Mews, Chiswick | element.io | | |
| Numerix Software Limitednot edited since 2021 | 41 Eastcheap, Monument | numerix.com | | |
| O |
| Outlandish | 149 Fonthill Road, Finsbury Park | outlandish.com | | |
| P |
| Pixelfieldnot edited since 2021 | 57a Hatton Garden, Clerkenwell | pixelfield.co.uk | +44 7810 724425 | |
| Q |
| Qube Global Softwarenot edited since 2021 | Bank, no street on record | | | |
| R |
| Renegarenot edited since 2018 | South Bermondsey, no street on record | | | |
| S |
| Shirley Computer Servicesnot edited since 2018 | 21 Spring Lane, Woodside | shirleycomputerservices.co.uk | | |
| Software Solution Systems | 13d Crawford Street, Marylebone | | +44 20 7034 3030 | |
| Sound System Technologynot edited since 2021 | Yiewsley, no street on record | | | |
| SpiderHunts | 182-184 High Street North, East Ham | spiderhunts.com | +44 7367 067226 | |
| Sugar Cube Productionsnot edited since 2020 | Myatt's Fields, no street on record | | | |
| T |
| TAG | Russell Gardens, Temple Fortune | | +44 20 7112 4848 | |
| Tangible BenefIT | 28-29 White Lion Street, Angel | tangiblebenefit.com | | |
| Tekcabin | Purley Way, Waddon | tekcabin.com | +44 20 8247 9932 | |
| The Old Creche | Colham Green, no street on record | | | |
| Tutoriallynot edited since 2020 | 27 Old Gloucester Street, Bloomsbury | tutorially.co.uk | +44 1215 621811 | |
| W |
| WinMax IT Services LTD | Dawes Street, Walworth | winmaxit.com | +44 20 3384 8637 | |
| Z |
| ZeniMax Europe Ltd. | Spitalfields, no street on record | zenimax.com | +44 20 7389 1100 | |