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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

John Matthew Mackowski

    Related profiles found in government register
  • John Matthew Mackowski
    American born in June 1954

    Resident in United States

    Registered addresses and corresponding companies
    • 360, Post Street, Suite 601, San Francisco, California, CA 94108, United States

      IIF 1
  • Mackowski, John Matthew
    American born in June 1954

    Resident in United States

    Registered addresses and corresponding companies
    • 300 Montgomery Street, Suite 1130, San Francisco, Ca, United States

      IIF 2
    • Spring Gardens, Whitland, Carmarthenshire, SA34 0HR

      IIF 3
child relation
Offspring entities and appointments 3
  • 1
    THE MAGSTIM COMPANY LIMITED
    - now 02308367
    PHYSIOLOGICAL INSTRUMENTATION LIMITED - 1990-02-15
    Spring Gardens, Whitland, Carmarthenshire
    Active Corporate (21 parents, 1 offspring)
    Equity (Company account)
    5,096,750 GBP2024-12-31
    Officer
    2015-09-24 ~ now
    IIF 3 - Director → ME
  • 2
    TRAKCEL LIMITED
    07902511
    10-11 Raleigh Walk Waterfront 2000, Brigantine Place, Cardiff
    Active Corporate (15 parents)
    Equity (Company account)
    6,641,791 GBP2024-12-31
    Officer
    2016-10-17 ~ now
    IIF 2 - Director → ME
  • 3
    VEROGEN U.K. LTD
    - now 10798359
    VERITY BIO UK LTD
    - 2018-01-02 10798359
    12 New Fetter Lane, London
    Dissolved Corporate (7 parents)
    Equity (Company account)
    -34,219 GBP2020-06-30
    Person with significant control
    2017-06-01 ~ dissolved
    IIF 1 - Right to appoint or remove directors as a member of a firm OE
    IIF 1 - Ownership of voting rights - 75% or more as a member of a firm OE
    IIF 1 - Ownership of shares – 75% or more as a member of a firm OE

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