Filing status
- Accounts due
- 31 December 2026
- Last accounts
- 30 June 2025
- Conf. stmt due
- 12 August 2027
- Last conf. stmt
- 29 July 2026
Sia Partners UK PLC
- Incorporated
- 24 July 2006 (20 years)
- Previously known as
- Investance UK PLC (until 28 November 2013)This list may be incomplete. See all names on Companies House
- Industry
- Other business support service activities n.e.c. (82990)
- Directors
- Sandrine CarreauGary O'SullivanMatthieu Courtecuisse
- Owned by
- Matthieu Courtecuisse
- Accounts type
- Full
- Region
- Greater London
- Address
- 4th Floor90 Bartholomew CloseLondonEC1A 7EB
Officers 4 active
Officer details are public data from the Companies House register.
Carreau, Sandrine
Director · Appointed 1 November 2025
French
Born April 1987 (39)
O'Sullivan, Gary
Director · Appointed 30 April 2022
Irish
Born February 1968 (58)
Courtecuisse, Matthieu
Director · Appointed 13 September 2013
French
Born June 1973 (53)
Corporate Nominee Secretary · Appointed 24 July 2006
Officer history (5 former)
25 June 2026
Resigned Rocafull, Thomas as Director
1 November 2025
Appointed Carreau, Sandrine as Director
26 September 2023
Resigned Mckay, Michael as Director
30 April 2022
Appointed O'Sullivan, Gary as Director
30 April 2022
30 April 2022
Appointed Mckay, Michael as Director
10 December 2018
13 September 2013
Appointed Rocafull, Thomas as Director
13 September 2013
Appointed Courtecuisse, Matthieu as Director
13 September 2013
Resigned Boisne, Cedric Paul Pierre as Director
13 September 2013
Resigned Dahan, Franck Arick as Director
24 July 2006
24 July 2006
Appointed Boisne, Cedric Paul Pierre as Director
24 July 2006
Appointed Dahan, Franck Arick as Director
Ownership 1 active
People and entities with significant control, from the Companies House PSC register
Matthieu Courtecuisse
Individual · Notified 6 April 2016
Owns 50–75% of shares
Holds 50–75% of voting rights
French
Born June 1973 (53)
Group structure 3 companies
Ownership group derived from the Companies House PSC register
Sia Partners UK PLC This company
Upside X Limited Owns 75–100% of shares
Upside Studio Ltd Owns 75–100% of shares
Filings 85
| Date | Description | Made Up To | Pages | |
|---|---|---|---|---|
| 31 July 2026 | Confirmation statement with no updates | 29 July 2026 | ||
| 20 July 2026 | Termination of appointment of a director | |||
| 18 June 2026 | Appointment of a director | |||
| 21 December 2025 | Full accounts | 30 June 2025 | ||
| 7 August 2025 | Confirmation statement with updates | 29 July 2025 |
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