Website & contact details
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Mimecast Midco Limited
- Incorporated
- 29 November 2021 (4 years)
- Previously known as
- Magnesium Midco Limited (until 1 November 2022)
- Industry
- Activities of other holding companies n.e.c. (64209)
- Directors
- Accounts type
- Full
- Region
- Greater London
- Address
- Floor 41 Finsbury AvenueLondonEC2M 2PF
Filing status
- Accounts due
- 31 December 2026
- Last accounts
- 31 March 2025
- Conf. stmt due
- 12 December 2026
- Last conf. stmt
- 28 November 2025
Charges
- Total
- 1
- Outstanding
- 1
- Part satisfied
- 0
- Satisfied
- 0
Officers 3 active
Officer details are public data from the Companies House register.
Director · Appointed 15 October 2025
British
Born March 1968 (58)
Director · Appointed 30 November 2023
American
Born January 1974 (52)
Dollase, Christopher
Secretary · Appointed 1 February 2023
Officer history (9 former)
15 October 2025
15 October 2025
31 May 2025
30 November 2023
29 November 2023
1 February 2023
Appointed Dollase, Christopher as Secretary
31 January 2023
Resigned Nault, Robert as Secretary
1 November 2022
20 May 2022
19 May 2022
19 May 2022
19 May 2022
19 May 2022
Appointed Nault, Robert as Secretary
19 May 2022
19 May 2022
19 May 2022
19 May 2022
29 November 2021
29 November 2021
29 November 2021
29 November 2021
Ownership 1 active
People and entities with significant control, from the Companies House PSC register
Corporate entity · Notified 29 November 2021
Owns 75–100% of shares
Holds 75–100% of voting rights
Right to appoint and remove directors
Limited By Shares
Reg. no. 13768778
Holdings 1
Companies where Mimecast Midco Limited is registered as a person with significant control
Owns 75–100% of shares
Active
Group structure 48 shown
Ownership group derived from the Companies House PSC register
Eightplatform I Limited Owns 75–100% of shares
Mimecast Advisory Company Limited Owns 75–100% of shares
Mimecast Midco Limited This company Owns 75–100% of shares
Eightplatform II Limited Owns 75–100% of shares
Artisan Topco Limited Owns 75–100% of shares
Artisan Midco Limited Owns 75–100% of shares
Eightplatform IV Limited Owns 75–100% of shares
Eightplatform V Limited Owns 75–100% of shares
Eden Topco Limited Owns 75–100% of shares
Eden Holdco 1 Limited Owns 75–100% of shares
Eightplatform Vii Limited Owns 75–100% of shares
Aurelia UK Feederco Limited Owns 25–50% of shares
Adevinta UK Limited Owns 25–50% of shares
Eightplatform XI Limited Owns 75–100% of shares
Eightplatform Xii Limited Owns 75–100% of shares
Eightplatform Xiii Limited Owns 75–100% of shares
4-6 Cliveden Place Limited Owns 50–75% of shares (as a trust)
Indos Financial Limited Owns 75–100% of shares
JTC (UK) Limited Owns 75–100% of shares
Castle Directors (UK) Limited Owns 75–100% of shares
Hanway Advisory Limited Owns 75–100% of shares
JTC Corporate Services (UK) Limited Owns 75–100% of shares
JTC Directors (UK) Limited Owns 75–100% of shares
JTC Securities (UK) Limited Owns 75–100% of shares
JTC Trustee Services (UK) Limited Owns 75–100% of shares
JTC Trustees (UK) Limited Owns 75–100% of shares
JTC Bravo Holdings Limited Owns 75–100% of shares
JTC Gas UK LLP Holds 25–50% of voting rights
JTC Employer Solutions (UK) Limited Owns 75–100% of shares
JTC Employer Solutions Trustee (UK) Limited Owns 75–100% of shares
JTC Share Plan Trustees (UK) Limited Owns 75–100% of shares
JTC Fund Services (UK) Limited Owns 75–100% of shares
JTC Global Aifm Solutions (UK) Limited Owns 75–100% of shares
JTC Group Holdings (UK) Limited Owns 75–100% of shares
Perform Due Diligence Services Limited Owns 75–100% of shares
JTC Private Office (UK) Limited Owns 75–100% of shares
JTC Registrars (UK) Limited Owns 75–100% of shares
JTC Trust and Fiduciary Services (UK) Limited Owns 75–100% of shares
JTC Trust Company (UK) Limited Owns 75–100% of shares
JTC UK (Amsterdam) Limited Owns 75–100% of shares
Seproperty Investments Limited Owns 75–100% of shares (as a trust)
Winova Consulting Limited Owns 75–100% of shares (as a trust)
Eightplatform Xiv Limited Owns 75–100% of shares
Kant Topco Limited Owns 75–100% of shares
Kant Midco Limited Owns 75–100% of shares
Eightplatform XV Limited Owns 75–100% of shares
Filings 46
| Date | Description | Made Up To | Pages | |
|---|---|---|---|---|
| 2 January 2026 | Full accounts | 31 March 2025 | ||
| 11 December 2025 | Confirmation statement with no updates | 28 November 2025 | ||
| 15 October 2025 | Appointment of a director | |||
| 15 October 2025 | Termination of appointment of a director | |||
| 5 June 2025 | Change of details for a person with significant control |
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