opendata.bot
Company number
OC371629

CASTILIUM CAPITAL LLP

Active
✓ Active company on the official register. Next accounts due 26 June 2026.

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
CASTILIUM CAPITAL LLP
Company number
OC371629
Registered office
8 - 10 HILL STREET, HILL STREET, LONDON, W1J 5NG, ENGLAND · 78 other companies at this postcode
Company type
Limited Liability Partnership
Incorporated on
19 January 2012
Status
Active
Age
14 years
Accounts — next due
26 Jun 2026
Accounts — last made up to
26 Sept 2024
Confirmation statement — next due
02 Feb 2027
Confirmation statement — last
19 Jan 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

Arnold E Amstutz
voting rights 25 to 50 percent limited liability partnership · right to share surplus assets 25 to 50 percent limited liability partnership
Notified 24/07/2016
Mr Guy Stuart Mitchinson
voting rights 25 to 50 percent limited liability partnership · right to share surplus assets 25 to 50 percent limited liability partnership
Notified 24/07/2016
Mr Michael Neff
voting rights 25 to 50 percent limited liability partnership · right to share surplus assets 25 to 50 percent limited liability partnership
Notified 24/07/2016

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

Mr Guy Stuart Mitchinson
born 08/1978 · England voting rights 25 to 50 percent limited liability partnership · right to share surplus assets 25 to 50 percent limited liability partnership Notified 24/07/2016 Controls 2 companies
Arnold E Amstutz
born 07/1936 · United States voting rights 25 to 50 percent limited liability partnership · right to share surplus assets 25 to 50 percent limited liability partnership Control ended 18/01/2026
Mr Michael Neff
born 09/1963 · Bermuda voting rights 25 to 50 percent limited liability partnership · right to share surplus assets 25 to 50 percent limited liability partnership Control ended 18/01/2026

Change history

Reconstructed from the dated records Companies House publishes

DateChangeWasNow
18/01/2026 Person with significant control ceased Mr Michael Neff
18/01/2026 Person with significant control ceased Arnold E Amstutz
24/07/2016 Person with significant control added Mr Michael Neff
24/07/2016 Person with significant control added Mr Guy Stuart Mitchinson
24/07/2016 Person with significant control added Arnold E Amstutz

Documents for CASTILIUM CAPITAL LLP

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/OC371629
X-Api-Key: $OPENDATA_KEY
Read the API docs

Frequently asked questions

What is the company number of CASTILIUM CAPITAL LLP?
According to the official registry, the company number of CASTILIUM CAPITAL LLP is OC371629.
Where is CASTILIUM CAPITAL LLP registered?
The registered office is 8 - 10 HILL STREET, HILL STREET, LONDON, W1J 5NG, ENGLAND.
Who controls CASTILIUM CAPITAL LLP?
Arnold E Amstutz is recorded as a person with significant control, and voting rights 25 to 50 percent limited liability partnership, right to share surplus assets 25 to 50 percent limited liability partnership.
When are the next accounts of CASTILIUM CAPITAL LLP due?
The next annual accounts are due by 26 June 2026, and the last accounts were made up to 26 September 2024.

About CASTILIUM CAPITAL LLP (OC371629)

CASTILIUM CAPITAL LLP is a limited liability partnership incorporated on 19 January 2012 and registered in the United Kingdom under company number OC371629. Its registered office is at 8 - 10 HILL STREET, HILL STREET, LONDON, W1J 5NG, ENGLAND. The company is currently active , with statutory accounts last made up to 26 September 2024. , and the person with significant control is Arnold E Amstutz. 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

SIC 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.