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The above diagram shows the color scheme of the layout in the main result page. The parent entities and officers who have significant controls over the individuals in focus are always inapplicable. The offspring entities and appointments are those entities that the individuals in focus can influence on.

Clicking the links on parent entities or officers, and offspring entities or managed companies will put them in focus and show upstream or downstream connections. In general, ascendant entities can be found by moving toward upstream, and descendant entities are by toward downstream. In this way, progenitor entities such as grandparent companies (parents of parent), sibling companies (children of parent), partner companies (parents of child), and progeny entities such as grandchild companies (children of child) can be found easily.

Parent entities and officers
Inapplicable
parent relation
Individuals in focus

Mavrona, Ioanna

    Related profiles found in government register
  • Mavrona, Ioanna
    Greek born in June 1980

    Resident in United Kingdom

    Registered addresses and corresponding companies
    • 16, Great Queen Street, Covent Garden, London, WC2B 5AH, United Kingdom

      IIF 1
    • Acre House, 11/15 William Road, London, NW1 3ER, United Kingdom

      IIF 2
  • Ioanna Mavrona
    Greek born in June 1980

    Resident in United Kingdom

    Registered addresses and corresponding companies
    • 16, Great Queen Street, Covent Garden, London, WC2B 5AH, United Kingdom

      IIF 3
  • Mrs Ioanna Mavrona
    Greek born in June 1980

    Resident in England

    Registered addresses and corresponding companies
    • 25, Farringdon Street, London, EC4A 4AB, England

      IIF 4
    • Acre House, 11/15 William Road, London, NW1 3ER, United Kingdom

      IIF 5
child relation
Offspring entities and appointments 3
  • 1
    GLOBALWEBINDEX HOLDINGS LIMITED
    10290233
    25 Farringdon Street, London, England
    Active Corporate (13 parents, 5 offsprings)
    Equity (Company account)
    -48,112 GBP2016-12-31
    Person with significant control
    2016-08-22 ~ 2022-01-27
    IIF 4 - Ownership of shares – More than 25% but not more than 50% OE
    IIF 4 - Ownership of voting rights - More than 25% but not more than 50% OE
  • 2
    THINK BIG INVESTMENTS LTD
    13831515
    16 Great Queen Street, Covent Garden, London, United Kingdom
    Active Corporate (2 parents)
    Equity (Company account)
    -401,049 GBP2024-06-30
    Officer
    2022-01-06 ~ now
    IIF 2 - Director → ME
    Person with significant control
    2022-01-06 ~ now
    IIF 5 - Ownership of shares – More than 25% but not more than 50% OE
    IIF 5 - Ownership of voting rights - More than 25% but not more than 50% OE
  • 3
    TSIM4
    14171512
    16 Great Queen Street, Covent Garden, London
    Active Corporate (2 parents)
    Officer
    2022-06-14 ~ now
    IIF 1 - Director → ME
    Person with significant control
    2022-06-14 ~ now
    IIF 3 - Ownership of voting rights - More than 25% but not more than 50% OE
    IIF 3 - Ownership of shares – More than 25% but not more than 50% OE

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Contains public sector information retrieved at 9 February 2026 and licensed under the Open Government Licence v3.0.