opendata.bot
Company number
15736772

INFORMAL SYSTEMS HOLDING UK LIMITED

Active
✓ Active company on the official register. Next accounts due 30 September 2027.

Company details

London, England Contains OS data © Crown copyright and database right. Contains Royal Mail data © Royal Mail copyright and database right. Source: Office for National Statistics licensed under the Open Government Licence v.3.0.
Registered name
INFORMAL SYSTEMS HOLDING UK LIMITED
Company number
15736772
Registered office
9TH FLOOR, 107 CHEAPSIDE, LONDON, EC2V 6DN, UNITED KINGDOM · 574 other companies at this postcode
Company type
Private Limited Company
Incorporated on
23 May 2024
Status
Active
Age
2 years
Nature of business (SIC)
64209 — Activities of other holding companies n.e.c.
Accounts — next due
30 Sept 2027
Accounts — last made up to
31 Dec 2025
Confirmation statement — next due
07 May 2027
Confirmation statement — last
23 Apr 2026

What the register says

Facts from the register, with the dates they are filed under. Not a score: what they mean is for you to judge, and every line can be checked against Companies House itself.

Companies House register snapshot, read 02/09/2026.

People with significant control

Beneficial owners holding over 25% of shares, voting rights or the right to appoint directors

Arianne Flemming
owns 25–50% of shares
Notified 01/01/2026
Ethan Buchman
owns 25–50% of shares
Notified 01/01/2026
Zarko Milosevic
owns 25–50% of shares
Notified 01/01/2026

Corporate structure

Who controls this company, and who they control in turn

3 controllers Drag to move · scroll to zoom · double-click to expand
Company Person Current control Ended

Connections

Arianne Flemming
born 12/1989 · United States owns 25–50% of shares Control ended 01/01/2026
Ethan Buchman
born 04/1990 · Canada owns 25–50% of shares Control ended 01/01/2026
Zarko Milosevic
born 09/1982 · Serbia owns 25–50% of shares Control ended 01/01/2026

Change history

Reconstructed from the dated records Companies House publishes

DateChangeWasNow
01/01/2026 Person with significant control ceased Zarko Milosevic
01/01/2026 Person with significant control ceased Ethan Buchman
01/01/2026 Person with significant control ceased Arianne Flemming
01/01/2026 Person with significant control added Zarko Milosevic
01/01/2026 Person with significant control added Ethan Buchman
01/01/2026 Person with significant control added Arianne Flemming

Documents for INFORMAL SYSTEMS HOLDING UK LIMITED

Need this one company on file? Buy the document on its own — no plan required.

Company extract£1.99

The full registration record as held today — name, number, status, registered office, company type, previous names, officers, PSC and SIC codes, timestamped for your file.

PDF Order
Financial statements£3.99

Every figure the company’s own accounts state, across each filed period, with year-on-year movement. Most UK companies file small or micro-entity accounts — a balance sheet and a headcount, no turnover or profit.

PDF + CSV Order
Ownership report£3.99

Who controls the company: persons with significant control, the nature of that control, the ownership graph and every other company those controllers hold.

PDF Order

Data protection register

No entry found on the ICO register of fee payers under this name.

Not every organisation has to register — some are exempt. An absent entry is a question to ask, not a finding.

Get this company via API

Every field on this page is available as structured JSON behind one endpoint and one API key.

GET /v1/company/gb/15736772
X-Api-Key: $OPENDATA_KEY
Read the API docs

Frequently asked questions

What is the company number of INFORMAL SYSTEMS HOLDING UK LIMITED?
According to the official registry, the company number of INFORMAL SYSTEMS HOLDING UK LIMITED is 15736772.
Where is INFORMAL SYSTEMS HOLDING UK LIMITED registered?
The registered office is 9TH FLOOR, 107 CHEAPSIDE, LONDON, EC2V 6DN, UNITED KINGDOM.
What is the SIC code of INFORMAL SYSTEMS HOLDING UK LIMITED?
The nature of business is recorded under SIC code 64209 — Activities of other holding companies n.e.c..
Who controls INFORMAL SYSTEMS HOLDING UK LIMITED?
Arianne Flemming is recorded as a person with significant control, and owns 25–50% of shares.
When are the next accounts of INFORMAL SYSTEMS HOLDING UK LIMITED due?
The next annual accounts are due by 30 September 2027, and the last accounts were made up to 31 December 2025.

About INFORMAL SYSTEMS HOLDING UK LIMITED (15736772)

INFORMAL SYSTEMS HOLDING UK LIMITED is a private limited company incorporated on 23 May 2024 and registered in the United Kingdom under company number 15736772. Its registered office is at 9TH FLOOR, 107 CHEAPSIDE, LONDON, EC2V 6DN, UNITED KINGDOM. The recorded nature of business is activities of other holding companies n.e.c. (SIC 64209). The company is currently active , with statutory accounts last made up to 31 December 2025. , and the person with significant control is Arianne Flemming. This profile is provided by opendata.bot by Noetikos, aggregating official data from Companies House bulk data , last refreshed 2 September 2026.

Companies at the same registered office

Activities of other holding companies n.e.c. across UK registers

The same sector and the same company, seen through every register we hold

Explore by sector

Every UK company records what it does as a SIC code — browse the sectors around this one.