OpenRegistry
Companies House/London/Company profile

CALLOSUM LTD

Active
16076949·incorporated 2024-11-13

CALLOSUM LTD is an active UK private limited company, incorporated on 13 November 2024 at Companies House (number 16076949; OpenRegistry canonical ID GB-16076949-callosum-ltd). Sophymarine's OpenRegistry classifies it under SIC 72190 (Other research and experimental development on natural sciences and engineering), one of 5,871 active UK entities in that code and one of 1,093,852 active companies registered in London (postcode E1). Programmatic access via MCP at https://openregistry.sophymarine.com/mcp.

Status
Active
Type
Private Limited Company
Incorporated
2024-11-13
Registered Address
56 LEMAN STREET, LONDON, E1 8EU, ENGLAND
SIC
72190 — Other research and experimental development on natural sciences and engineering
Country of origin
United Kingdom

Directors

Search directors of CALLOSUM LTD

Shareholders

Look up shareholders of CALLOSUM LTD

Financials

Check financials of CALLOSUM LTD

Filings

Check filing history of CALLOSUM LTD

Accounts

Next accounts due 2026-08-13. Financial year-end: 31/12. Filing class: NO ACCOUNTS FILED.

Confirmation statement

Last confirmation statement made up to 2025-11-11. Next confirmation statement due 2026-11-25.

Persons with significant control

CALLOSUM LTD has 1 person with significant control on file:

  • Callosum Technologies Ltd (England reg. 16646869). Notified 2025-08-26.
    • Owns 75% or more of shares
    • Holds 75% or more of voting rights
    • Has the right to appoint and remove directors
  • No individual or entity with significant control has been identified.

1 historical PSC record has ceased:

  • (unnamed). Notified 2024-11-13. Ceased 2025-08-26.

Previous names

CALLOSUM LTD has previously traded as:

  • SERNN LTD (until 2025-08-26)

Similar UK companies

Other companies registered under SIC 72190 (Other research and experimental development on natural sciences and engineering):

Other companies registered in London:

Need real-time profile, officers, shareholders, financials or filing? Open the live profile at /company/gb/16076949.

Source: Companies House Free Company Data, refreshed 2026-05-01. Official record: find-and-update.company-information.service.gov.uk.