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The above diagram shows the color scheme of the layout in the main result page. The parent entities and officers are those entities, including individual and legal persons, have significant controls over the company in focus. The offspring entities and appointments are those entities that the company 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 3
  • 1
    Symeonidou, Olga
    Company Director born in December 1995
    Individual (1 offspring)
    Officer
    2016-10-18 ~ now
    OF - Director → CIF 0
  • 2
    Arvanitakis, Konstantinos
    Company Director born in November 1994
    Individual (2 offsprings)
    Officer
    2016-10-18 ~ now
    OF - Director → CIF 0
    Mr Konstantinos Arvanitakis
    Born in November 1994
    Individual (2 offsprings)
    Person with significant control
    2016-10-18 ~ now
    PE - Ownership of voting rights - More than 25% but not more than 50%CIF 0
    PE - Ownership of shares – More than 25% but not more than 50%CIF 0
  • 3
    Stavrou, Ilias
    Company Director born in May 1979
    Individual (1 offspring)
    Officer
    2016-10-18 ~ now
    OF - Director → CIF 0
parent relation
Company in focus

BLOCK 21 LIMITED

Company number: 10433973
Registered name
BLOCK 21 LIMITED - Dissolved 10469249... (more)
Standard Industrial Classification
73110 - Advertising Agencies
63120 - Web Portals

  • BLOCK 21 LIMITED
    Info
    Registered number 10433973
    Office 32 19-21 Crawford Street, London W1H 1PJ
    PRIVATE LIMITED COMPANY incorporated on 2016-10-18 and dissolved on 2018-03-27 (1 year 5 months). The company status is Dissolved.
    CIF 0
child relation
Offspring entities and appointments 0
  • Not found in our database.

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