--- title: "Callsign Ltd: UK sponsor licence status" canonical: https://uk-sponsors.getborderless.co.uk/sponsors/callsign-ltd-london-785423 register_status: active register_as_of: 2026-11-02 publisher: Borderless (https://www.getborderless.co.uk) source: UK Home Office register of licensed sponsors (Open Government Licence v3); Companies House --- # Callsign Ltd: UK sponsor licence status > As of 2 November 2026, Callsign Ltd (Companies House 07277719, London) holds an A-rated Worker sponsor licence covering the Skilled Worker route and has appeared on the UK Home Office register of licensed sponsors since 29 July 2020 (source: Borderless, from the GOV.UK register of licensed sponsors and Companies House). ## Key facts - Register status: Active: on the current register and licensed to sponsor workers - Licence type and rating: Worker (A rating) - Visa routes: Skilled Worker - First seen on the register: 29 July 2020 - Legal name: CALLSIGN LTD. - Industry: Technology & Software - Town: London - Registered address: 1 Bartholomew Close, London, England, EC1A 7BL - Companies House number: 07277719 (https://find-and-update.company-information.service.gov.uk/company/07277719) - Website: https://www.callsign.com - Register data as of: 2 November 2026 (GOV.UK register of licensed sponsors, re-read daily) - Web page: https://uk-sponsors.getborderless.co.uk/sponsors/callsign-ltd-london-785423 ## Where this sponsor sits - One of 36,683 licensed sponsors in London: https://uk-sponsors.getborderless.co.uk/sponsors/in/london - One of 15,391 in Technology & Software: https://uk-sponsors.getborderless.co.uk/sponsors/industry/technology-software - Among 122,278 Skilled Worker sponsors: https://uk-sponsors.getborderless.co.uk/sponsors/route/skilled-worker ## Companies House changes since it joined the register 15 changes worth checking, checked 2 November 2026, newest first: - 22 Jun 2026: Registered office address changed. Registered office change recorded on 22 Jun 2026. If the address on your sponsor licence has changed, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 17 Nov 2025: Registered office address changed. Registered office change recorded on 17 Nov 2025. If the address on your sponsor licence has changed, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 23 Nov 2023: Registered office address changed. Registered office change recorded on 23 Nov 2023. If the address on your sponsor licence has changed, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 1 Sep 2023: Director resigned: IMBACH, Patrick. Director change recorded on 1 Sep 2023. If this person was your Authorising Officer, Key Contact or Level 1 user, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 31 Aug 2023: New director appointed: HAYAT, Zia, Dr. Director change recorded on 31 Aug 2023. If this person is now your Authorising Officer, Key Contact or Level 1 user, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 31 Jul 2023: New shares issued (allotment). Share capital filing recorded on 31 Jul 2023. No new majority owner was notified, so this is usually routine. If it did pass a controlling interest to someone new, the licence does not transfer automatically, and a new licence application may be needed within 20 working days. - 28 Feb 2023: New director appointed: IMBACH, Patrick. Director change recorded on 28 Feb 2023. If this person is now your Authorising Officer, Key Contact or Level 1 user, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 28 Feb 2023: Director resigned: THOMPSON, Corinne. Director change recorded on 28 Feb 2023. If this person was your Authorising Officer, Key Contact or Level 1 user, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 21 Jun 2022: Registered office address changed. Registered office change recorded on 21 Jun 2022. If the address on your sponsor licence has changed, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 31 Mar 2022: New director appointed: THOMPSON, Corinne. Director change recorded on 31 Mar 2022. If this person is now your Authorising Officer, Key Contact or Level 1 user, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 31 Mar 2022: Director resigned: WELCH, Ian James. Director change recorded on 31 Mar 2022. If this person was your Authorising Officer, Key Contact or Level 1 user, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 31 Mar 2022: New director appointed: RITCHIE, Garth William, Mr.. Director change recorded on 31 Mar 2022. If this person is now your Authorising Officer, Key Contact or Level 1 user, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 25 Mar 2021: Director resigned: HAYAT, Zia, Dr. Director change recorded on 25 Mar 2021. If this person was your Authorising Officer, Key Contact or Level 1 user, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 21 Sep 2020: Cessation of Dr Zia Hayat as a person with significant control. Change to people with significant control recorded on 21 Sep 2020. If this changes who owns or controls your organisation, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. - 20 Aug 2020: New person with significant control: Dr Zia Hayat. Change to people with significant control recorded on 20 Aug 2020. If this changes who owns or controls your organisation, the change must be reported in the SMS (the Home Office sponsor system) within 20 working days. Companies House cannot show who holds the licence roles or whether a change was reported to the Home Office, so these are prompts to check against your own records, not findings. ## Sponsored jobs 1 live vacancy tracked for this employer (1 tracked all-time), harvested daily from Reed, Adzuna, Jooble and Careerjet and matched by employer name. - Technical Support Engineer · Manchester, Greater Manchester · £31,798 · live · https://www.adzuna.co.uk/jobs/details/5917381771?utm_medium=api&utm_source=3195f9d3 All listings: https://uk-sponsors.getborderless.co.uk/jobs?sponsorId=785423&employer=CALLSIGN%20LTD A vacancy listed here does not by itself mean the role is offered with sponsorship. Check the advert or ask the employer. ## Common questions about Callsign Ltd ### Is Callsign Ltd a licensed UK visa sponsor? Yes. Callsign Ltd in London is on the Home Office register of licensed sponsors under this name since 2020. It can sponsor workers from overseas, but not every job it advertises comes with sponsorship. ### What visa routes can Callsign Ltd sponsor? Callsign Ltd is licensed for Skilled Worker. Its licence rating on the register is "Worker (A rating)". ### Does Callsign Ltd have any jobs open right now? We are currently tracking 1 live vacancy from Callsign Ltd on UK job boards. Not every job offers sponsorship, so check the advert or ask the employer. ### Where is Callsign Ltd based? The register lists Callsign Ltd at 1 Bartholomew Close, London, England, EC1A 7BL. This is usually the head office; the job itself may be somewhere else. ### How current is this information? This page uses the UK Home Office register of licensed sponsors, as published on 2 November 2026, and Companies House records for company number 07277719. We update it daily. Always confirm a licence status on GOV.UK. ## About this data - Source register: UK Home Office, Register of Licensed Sponsors (Workers), https://www.gov.uk/government/publications/register-of-licensed-sponsors-workers (Open Government Licence v3). GOV.UK is authoritative; confirm there before relying on a licence status. - Company records: Companies House, https://find-and-update.company-information.service.gov.uk/ - Published by Borderless (https://www.getborderless.co.uk), an OISC-regulated UK immigration provider. This is public register data, not legal advice. - "First seen on the register" is when this organisation first appeared in our data, not the official licence grant date. - Web page: https://uk-sponsors.getborderless.co.uk/sponsors/callsign-ltd-london-785423 - This fact sheet: https://uk-sponsors.getborderless.co.uk/sponsors/callsign-ltd-london-785423.md - Site overview for AI agents: https://uk-sponsors.getborderless.co.uk/llms.txt - Something wrong? Request a correction from the web page and the Borderless team will check it.