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Callosum Ltd

Callosum Ltd is an active company incorporated on 13 November 2024 with the registered office located in London, Greater London. Callosum Ltd was registered 1 year ago.
Status
Active
Active since incorporation
Company No
16076949
Private limited company
Age
1 year
Incorporated 13 November 2024
Size
Micro
Turnover is under £1M
Balance sheet is under £500,000
Under 10 employees
Confirmation
Submitted
Dated 11 November 2025 (25 days ago)
Next confirmation dated 11 November 2026
Due by 25 November 2026 (11 months remaining)
No changes occurred since incorporation
Accounts
Not Submitted
Awaiting first accounts
For period ending 31 December 2025
Due by 13 August 2026 (8 months remaining)
Address
56 Leman Street
London
E1 8EU
England
Address changed on 17 Apr 2025 (7 months ago)
Previous address was Flat 11 50 Clanricarde Gardens London W2 4JW United Kingdom
Telephone
Unreported
Email
Unreported
Website
Unreported
People
Officers
2
Shareholders
1
Controllers (PSC)
1
Director • German • Lives in England • Born in Jul 1996
Director • British • Lives in UK • Born in Mar 1995
Callosum Technologies Ltd
PSC
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Mutual Companies
Callosum Technologies Ltd
Dr Jascha Achterberg and Dr Danyal Akarca are mutual people.
Active
Financials
Callosum Ltd has not yet submitted any accounts
Period Ended
Due Soon
Cash in Bank
Due Soon
Turnover
Due Soon
Employees
Due Soon
Total Assets
Due Soon
Total Liabilities
Due Soon
Net Assets
Due Soon
Debt Ratio (%)
Due Soon
Latest Activity
Dr Jascha Achterberg Details Changed
20 Days Ago on 16 Nov 2025
Confirmation Submitted
25 Days Ago on 11 Nov 2025
Callosum Technologies Ltd (PSC) Appointed
3 Months Ago on 26 Aug 2025
Registered Address Changed
7 Months Ago on 17 Apr 2025
Accounting Period Extended
11 Months Ago on 7 Jan 2025
Incorporated
1 Year Ago on 13 Nov 2024
Name changed from Sernn Ltd
1 Year Ago on 13 Nov 2024
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Documents
Director's details changed for Dr Jascha Achterberg on 16 November 2025
Submitted on 21 Nov 2025
Confirmation statement made on 11 November 2025 with no updates
Submitted on 11 Nov 2025
Withdrawal of a person with significant control statement on 27 August 2025
Submitted on 27 Aug 2025
Notification of Callosum Technologies Ltd as a person with significant control on 26 August 2025
Submitted on 27 Aug 2025
Certificate of change of name
Submitted on 26 Aug 2025
Registered office address changed from Flat 11 50 Clanricarde Gardens London W2 4JW United Kingdom to 56 Leman Street London E1 8EU on 17 April 2025
Submitted on 17 Apr 2025
Current accounting period extended from 30 November 2025 to 31 December 2025
Submitted on 7 Jan 2025
Incorporation
Submitted on 13 Nov 2024
Repayment History
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