O3 Energy OÜ
Registration details
Company overview
O3 Energy OÜ is a Private limited company (Ltd.) registered in Estonia under 14291372, and its current status with Estonian e-Business Register (ariregister) is active. The company was incorporated on 7 July 2017 and lists its registered address as Tallinn, Estonia. 1 shareholder is on record for O3 Energy OÜ, and since every one of them is a company rather than an individual, this particular filing does not on its own establish an ultimate beneficial owner (UBO) — identifying one would mean tracing the ownership of each shareholding company in turn. This profile is sourced directly from Estonian e-Business Register (ariregister) and was last updated on 6 November 2026.
Officers
4
Registry notes and limitations
Two of the 4 officer records shown for O3 Energy OÜ are current appointments, filed with Estonian e-Business Register (ariregister). Mihkel Hiielaid and Mats Viisileht both serve as Juhatuse Liige. The remaining 2 records shown (Martin Kiil and Mart Parna) are former appointments that have since been resigned.
Management authority at O3 Energy OÜ sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
The source filing doesn't specify representation authority — whether officers can act individually or must sign jointly to bind the company — so that detail isn't available here.
Group Structure
Hiimek OÜ
Estonia
How these relationships were recorded
O3 Energy OÜ sits 2 levels below its ultimate parent, Hiimek OÜ, registered in Estonia. Immediately above O3 Energy OÜ is O3 Technology OÜ, holding 100% as filed in O3 Energy OÜ's own shareholder record with Estonian e-Business Register (ariregister). Hiimek OÜ sits further up the chain, a link derived by walking shareholder filings across jurisdictions rather than stated in a single document.
Frequently asked questions
Who owns O3 Energy OÜ?
One shareholder is currently on record for O3 Energy OÜ, filed with Estonian e-Business Register (ariregister). The largest of these is O3 Technology Oü, holding 100% — a majority holding. Because the shareholder shown is a company rather than an individual, the ownership chain continues above this level, and no beneficial owner can be established from this filing alone.
Who is O3 Energy OÜ's UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for O3 Energy OÜ is itself a company rather than a natural person, so no Ultimate Beneficial Owner (UBO) is identified at this level; establishing one would require tracing the ownership of each shareholding company in turn.
How many shareholders does O3 Energy OÜ have on record?
1 shareholder is shown on record for O3 Energy OÜ.
What is O3 Energy OÜ's company registration number?
O3 Energy OÜ's registration number is 14291372, filed with Estonian e-Business Register (ariregister) in Estonia. Its current status on the register is active.
Is O3 Energy OÜ still an active company?
O3 Energy OÜ's status on Estonian e-Business Register (ariregister) is listed as active.
When was O3 Energy OÜ incorporated?
O3 Energy OÜ was incorporated on 7 July 2017, according to Estonian e-Business Register (ariregister).
What is O3 Energy OÜ's registered address?
The registered address on file for O3 Energy OÜ is Tallinn, Estonia.
What legal structure is O3 Energy OÜ registered as?
O3 Energy OÜ is registered as a Private limited company (Ltd.) in Estonia.
Who are the officers/directors of O3 Energy OÜ?
Two of the 4 officer records shown for O3 Energy OÜ are current appointments, filed with Estonian e-Business Register (ariregister). Mihkel Hiielaid and Mats Viisileht both serve as Juhatuse Liige. The remaining 2 records shown (Martin Kiil and Mart Parna) are former appointments that have since been resigned. Management authority at O3 Energy OÜ sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does O3 Energy OÜ have a parent company or subsidiaries?
O3 Energy OÜ sits 2 levels below its ultimate parent, Hiimek OÜ, registered in Estonia.
Can Zavia monitor changes to O3 Energy OÜ's ownership over time?
This profile reflects a point-in-time snapshot from Estonian e-Business Register (ariregister). Zavia's monitoring API can track changes to O3 Energy OÜ's registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access O3 Energy OÜ's data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including Estonia, so records like O3 Energy OÜ's registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from Estonian e-Business Register (ariregister) and was last synced on 6 November 2026.