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Search›Persons›Ari Juhani Siponmaa
AJ
Born 01.09.1959 · 66 y

Ari Juhani Siponmaa

Data is aggregated from the Business Register's open data. Every role shows its source and date.

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Public registry of Estonian companies — every fact traceable to a source and a date. Free and ad-free for everyone.

Nimistu MTÜ
Address: Parda tn 8, 10151 Tallinn, Estonia
E-mail: info@nimistu.ee

Browse

  • Home
  • Views
  • Industries
  • Activity licences
  • Recent registrations

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  • 79 sources
  • Database
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  • MCP

Organisation

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© 2026 Nimistu MTÜ. License CC-BY-SA 4.0 · details
4active companies2years active
Shareholder
3
companies
Board member
1
companies
Top role
Ecocoal OÜ
Shareholder
since 01.09.2023 · 2 y
Latest activity
Greenup Carbon Tech OÜ
Board member
since 27.10.2025

Career timeline

e-Business Register
2023202420252026Ecocoal OÜGreenup Carbon Tech OÜMereo Group OÜReval Engineering OÜosanikjuhatuse_liigeosanikosanik
Board memberFounderShareholderSupervisory board
  • Ecocoal OÜ – osanik (2023-09-01 – now)
  • Greenup Carbon Tech OÜ – juhatuse_liige (2025-10-27 – now)
  • Mereo Group OÜ – osanik (2023-09-02 – now)
  • Reval Engineering OÜ – osanik (2023-09-02 – now)

History

e-Business Register · last 2 years
2025
27.10.2025OfficerAstus juhatusse— Greenup Carbon Tech OÜ · Greenup Carbon Tech OÜ
⚠

Address shared by 183 companies (this person at 1 of them): Harju maakond, Tallinn, Kristiine linnaosa, Sõpruse pst 145.

The address is likely a corporate-services bureau / virtual office shared by many unrelated entities.

Activity overview

e-Business Register
Roles by type
Board member1
Shareholder3
Companies by sector
Manufacturing2
Professional, scientific and technical activities1
Electricity, gas, steam and air conditioning supply1

Companies (4)

e-Business Register
MG
Mereo Group OÜ12438776Active
Kristiine linnaosa, Tallinn, Harju maakond·EMTAK 28991
Shareholder 1% · 02.09.2023
2y
active
131k €
EO
Ecocoal OÜ16384497Active
Kesklinna linnaosa, Tallinn, Harju maakond·EMTAK 70201
Shareholder 33% · 01.09.2023
2y
active
0 €
RE
Reval Engineering OÜ16330320Active
Kesklinna linnaosa, Tallinn, Harju maakond·EMTAK 28991
Shareholder 10% · 02.09.2023
2y
active
0 €
GC
Greenup Carbon Tech OÜ17078495Active
Narva linn, Ida-Viru maakond·EMTAK 35111
Board member · 27.10.2025