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3I PLC
3i is an investment company specialising in Private Equity and Infrastructure. We invest in mid-market companies headquartered in Europe and North America. The company’s own description of itself, taken from its website.
Active 81 years old · 292nd oldest of 4,506 · incorporated in the 1940s
Registered office
1 KNIGHTSBRIDGE, LONDON, SW1X 7LX
Other PLCs registered in London
Online
Website www.3i.com
News and announcements on their own site
Found by searching for the company name and kept only where the domain matches it. Social accounts are listed only where the company links to them from its own site. Nothing here is supplied by the company to us.
Group structure
It is the immediate parent of 2 entities:
- EURO-DIESEL GROUP SA
- EURO-DIESEL PTE. LTD.
Ownership as recorded by GLEIF, the body that issues Legal Entity Identifiers. Unlike a shared registered office, these relationships are filed and validated, so they are evidence of a real corporate link.
Filing history
This company has 551 documents on its Companies House record. The most recent accounts were filed on 27/05/2026. Its last confirmation statement or annual return was filed on 01/04/2026.
The most recent filings
This is the list of documents filed, not their contents. A line saying accounts were filed records that they were filed and when; it says nothing about turnover, profit or assets, which are inside the documents themselves and are not published here. Read the filings on the Companies House record.
Who runs it
The register lists 4 current officers and 148 who have resigned.
Who controls it
Companies must record the people or entities with significant control. The register shows 1 current entry.
Owns 75% to 100% of the shares; Holds 75% to 100% of the voting rights; Can appoint and remove directors since 06/04/2016
Charges
A charge is security a company gives a lender over its assets. This company has 8 registered charges, of which 0 are not yet recorded as satisfied.
The Prudential Assurance Company Limitedfor the Stockholders (As Defined) Fully satisfied, created 19/02/1991
The Prudential Assurance Co LTD Fully satisfied, created 21/01/1969
The Prudential Assurance Company LTD Fully satisfied, created 09/06/1967
The Prudential Assurance Company LTD Fully satisfied, created 07/06/1966
The Commercial Union Assurance Company Limited Fully satisfied, created 03/03/1964
The Commercial Union Assurance Company Limited Fully satisfied, created 05/12/1961
The Commercial Union Assurance Co LTD Fully satisfied, created 11/04/1961
The Commercial Union Assurance Co LTD Fully satisfied, created 26/08/1959
Officers, controllers and charges are as recorded on the Companies House register on 13/10/2026, and the register changes daily. Appearing here is not an allegation about anyone. Read the current record on the Companies House record.
What it does
This page is compiled from the public register. Companies House does not verify the information filed with it, so treat everything here as what the company reported rather than as established fact. For filings, officers and charges, see the official Companies House record.
Also at SW1X 7LX
- 3I Europe PLC
- 3I Group PLC
- 3I Holdings PLC
- 3I International Services PLC
- 3I Investments PLC
- 3I Nordic PLC
A shared registered office is not evidence of a relationship. Formation agents and genuine groups look identical on the register.
On the register
- 292nd oldest of 4,506 PLCs
- One of the 1940s cohort
- Not in liquidation or facing strike off
There are 4,506 PLCs in Britain, under a tenth of one per cent of the register. The whole count.