O3 Technology OÜ
- Registry code
- 14062364
- VAT number
- EE101883922
- Address
- Harju maakond, Tallinn, Kristiine linnaosa, Vesipapi tn 2, 12619
- Registered
- 06.06.2016 · 10 yrs
- Activity
- Engineering activities and related technical consultancy 71121
- Capital
- 6 000 €
- i•••@o•••.eeLog in to see
- Phone
- +372 5•• ••••Log in to see
- Website
- https://o3.ee/
- LEI
- 6488JLA2J9GY8E512878 ISSUED
Business Register 05.10.2026
Sales revenue1,5 m €-0%2025 annual report
Profit100 k €2025 annual report
Employees3Tax Board 2026 Q2
Average gross salary4 933 €estimate, Tax Board 2026 Q2
Labour taxes per quarter22 641 €Tax Board 2026 Q2
Cash165 k €Cash 31.12.2025, annual report
Tax debt0 €Tax Board debtor list 05.10.2026
Revenue 12 months1,4 m €-13%Tax Board, last 4 quarters
State taxes 12 months182 k €Tax Board, last 4 quarters
Quick check
- No tax debt
- No enforcement proceedings (12 months)
- No payment orders (12 months)
- No bankruptcy or liquidation
- No sanctions
- Report filed (2025)
- VAT registered
Stability
Follow companyNotification when something changesRatingAA → AAA
In tax debt0 days since 26.09.2026
Revenue 12 months▼ 13% vs a year earlier
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Board and owners
2 persons
| Board 2 | ||
|---|---|---|
| Mats Viisileht4 companiesno tax debt | Personal ID ↗ | 24.04.2024 |
| Mihkel Hiielaid4 companiesno tax debt | Personal ID ↗ | 24.04.2024 |
| Shareholders 4 | ||
| Hiimek OÜ | 25,0% 1 500 € | 25.04.2025 |
| MAVI OÜ | 25,0% 1 500 € | 25.04.2025 |
| Martin Kiil | 25,0% 1 500 € | 02.09.2023 |
| Mikk Tasa | 25,0% 1 500 € | 02.09.2023 |
| Beneficial owners 2 | ||
| Martin Kiil1 companyno tax debtdirect holding | 16.10.2018 | |
| Mikk Tasadirect holding | 16.10.2018 | |
Business Register open data
Quarterly taxes and revenue
2026 Q2
State taxes / revenue13,3%
Labour taxes / revenue6,2%
Revenue per employee per month40 392 €
Gross salary (estimate)4 933 €
Net salary (estimate)3 863 €
2026 Q2. Wage is estimated from employment taxes.
| Quarter | Revenue | Change y/y | Labour taxes | State taxes | Employees |
|---|---|---|---|---|---|
| 2026 Q2 | 363 527 € | ▼ 25% | 22 641 € | 48 523 € | 3 |
| 2026 Q1 | 297 987 € | ▼ 32% | 21 500 € | 40 255 € | 3 |
| 2025 Q4 | 378 425 € | ▲ 29% | 21 183 € | 52 924 € | 3 |
| 2025 Q3 | 317 581 € | ▼ 9% | 20 834 € | 40 115 € | 3 |
| 2025 Q2 | 485 877 € | ▲ 20% | 20 652 € | 67 375 € | 3 |
| 2025 Q1 | 437 138 € | ▲ 32% | 19 977 € | 51 864 € | 5 |
| 2024 Q4 | 293 070 € | ▼ 16% | 18 328 € | 11 101 € | 5 |
| 2024 Q3 | 348 715 € | ▲ 20% | 31 499 € | 54 974 € | 5 |
| 2024 Q2 | 404 614 € | ▲ 11% | 47 511 € | 80 861 € | 8 |
| 2024 Q1 | 330 000 € | ▼ 3% | 39 914 € | 58 319 € | 10 |
| 2023 Q4 | 347 422 € | ▼ 0% | 41 659 € | 58 458 € | 10 |
| 2023 Q3 | 291 334 € | ▼ 16% | 43 415 € | 40 584 € | 10 |
Show full history (18 quarters)
| 2023 Q2 | 363 863 € | ▼ 3% | 45 275 € | 50 210 € | 9 |
| 2023 Q1 | 341 294 € | ▲ 20% | 42 623 € | 50 583 € | 9 |
| 2022 Q4 | 347 920 € | 36 293 € | 47 349 € | 9 | |
| 2022 Q3 | 346 532 € | 36 800 € | 72 886 € | 9 | |
| 2022 Q2 | 373 296 € | 19 172 € | 44 053 € | 9 | |
| 2022 Q1 | 284 106 € | 21 166 € | 33 801 € | 5 |
Tax and Customs Board, published on the 10th of the month following the quarter. State taxes include employment taxes. CC BY-SA 3.0
Annual reports
5 yr
| 2025 | 2024 | 2023 | 2022 | 2021 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Sales revenue | 1,5 m € | 0% | 1,5 m € | ▲ 10% | 1,3 m € | ▼ 1% | 1,3 m € | ▲ 46% | 912 k € |
| Profit | 100 k € | ▲ into profit | -1 840 € | ▲ 96% | -43 570 € | ▼ into loss | 144 k € | ▲ 145× | 995 € |
| Profit margin | 6,9% | -0,1% | -3,3% | 10,8% | 0,1% | ||||
| Retained earnings | 179 k € | ▼ 10% | 200 k € | ▼ 21% | 252 k € | ▲ 131% | 109 k € | ▼ 26% | 147 k € |
| Cash | 165 k € | ▲ 520% | 26 631 € | ▲ 88% | 14 135 € | ▼ 83% | 83 405 € | ▲ 4% | 80 384 € |
| Current assets | 339 k € | ▲ 5% | 323 k € | ▲ 66% | 194 k € | ▼ 35% | 296 k € | ▲ 12% | 264 k € |
| Fixed assets | 116 k € | ▼ 42% | 201 k € | ▼ 19% | 247 k € | ▲ 195% | 83 693 € | ▲ 174% | 30 575 € |
| Assets | 455 k € | ▼ 13% | 524 k € | ▲ 19% | 441 k € | ▲ 16% | 380 k € | ▲ 29% | 295 k € |
| Current liabilities | 170 k € | ▼ 46% | 312 k € | ▲ 43% | 218 k € | ▲ 81% | 120 k € | ▼ 14% | 140 k € |
| Long-term liabilities | 0 € | ▼ 100% | 9 700 € | ▼ 13% | 11 088 € | ▲ 290% | 2 845 € | ▼ 33% | 4 248 € |
| Total liabilities | 170 k € | ▼ 47% | 322 k € | ▲ 41% | 229 k € | ▲ 86% | 123 k € | ▼ 14% | 144 k € |
| Equity | 286 k € | ▲ 42% | 201 k € | ▼ 5% | 212 k € | ▼ 17% | 257 k € | ▲ 70% | 151 k € |
| Labour costs | -177 k € | ▲ 39% | -289 k € | ▲ 29% | -405 k € | ▼ 39% | -291 k € | ▼ 66% | -176 k € |
| Employees | 16 | ▲ 7% | 15 | ▼ 38% | 24 | ▼ 17% | 29 | ▲ 38% | 21 |
| Filed | 30.06.2026 | 30.06.2025 | 16.04.2024 | 29.06.2023 | 05.05.2022 | ||||
| Report | PDF ↓ | PDF ↓ | PDF ↓ | PDF ↓ | PDF ↓ |
▲ growth, ▼ decline compared to the previous year (growth in liabilities is red). Business Register, annual reports. CC BY 4.0
Revenue by activity
2025
| Activity | EMTAK | Sales revenue | Osa |
|---|---|---|---|
| Engineering activities and related technical consultancy main activity | 71121 | 1 458 773 € | 100% |
2025 annual report, RIK open data
Real estate
e-kinnistusraamat
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Source: e-kinnistusraamat (Centre of Registers and Information Systems), basic data
Debts and court cases
clean
No tax debt · Tax Board 05.10.2026
Tax Board debtor list (daily), Official Announcements, State Gazette. The Tax Board publishes only today's list; earlier history is collected by Firmo.
Enforcement, payment orders and notices
clean
Official Announcements contain no enforcement, payment order or tax authority notices about the company.
Official Announcements (CC BY-SA 4.0). Enforcement proceedings, payment orders or tax decisions are published there only if they cannot be delivered to the company otherwise. The enforcement register is not public, so the absence of a notice does not mean there are no claims.
State: transactions, tenders, grants
178 tuh € makseid · 1 toetust
Transactions with state institutions
20246 039 €
2023172 k €
Largest payers
| MAJANDUS- JA KOMMUNIKATSIOONIMINISTEERIUM | 164 703 € |
| Riigi Kinnisvara AS | 6 039 € |
| Eesti Teaduste Akadeemia Underi ja Tuglase Kirjanduskeskus | 4 062 € |
| Eesti Kunstiakadeemia | 1 980 € |
| Eesti Teaduste Akadeemia | 918 € |
All payments by month
| Month | Payer | Type | Field | Amount |
|---|---|---|---|---|
| 10.2024 | Riigi Kinnisvara AS | Operating costs | Other general services | 6 039 € |
| 12.2023 | Eesti Teaduste Akadeemia Underi ja Tuglase Kirjanduskeskus | Operating costs | Teadus- ja arendustegevus hariduses | 1 920 € |
| 10.2023 | MAJANDUS- JA KOMMUNIKATSIOONIMINISTEERIUM | Muud toetused | General economic and trade policy | 19 510 € |
| 10.2023 | Eesti Kunstiakadeemia | Fixed assets | Tertiary education | 1 980 € |
| 09.2023 | MAJANDUS- JA KOMMUNIKATSIOONIMINISTEERIUM | Muud toetused | General economic and trade policy | 22 218 € |
| 07.2023 | MAJANDUS- JA KOMMUNIKATSIOONIMINISTEERIUM | Muud toetused | General economic and trade policy | 34 195 € |
| 06.2023 | Eesti Teaduste Akadeemia Underi ja Tuglase Kirjanduskeskus | Operating costs | Teadus- ja arendustegevus hariduses | 2 142 € |
| 05.2023 | MAJANDUS- JA KOMMUNIKATSIOONIMINISTEERIUM | Muud toetused | General economic and trade policy | 19 456 € |
| 03.2023 | MAJANDUS- JA KOMMUNIKATSIOONIMINISTEERIUM | Muud toetused | General economic and trade policy | 30 198 € |
| 03.2023 | Eesti Teaduste Akadeemia | Operating costs | Other education, incl. administration | 918 € |
| 01.2023 | MAJANDUS- JA KOMMUNIKATSIOONIMINISTEERIUM | Muud toetused | General economic and trade policy | 39 125 € |
Riigi Tugiteenuste Keskus, Saldo makseandmikud
Toetuse saanud projektid toetus kokku 188 tuh €
| Projekt | Meede | Periood | Toetus | Välja makstud |
|---|---|---|---|---|
| Tehisintellekti abil kavandantavad ehitatud elukeskkonna lahendused Lõpetatud · Ettevõtluse ja Innovatsiooni Sihtasutus | Majanduse elavdamine | 01.06.2022 – 31.08.2023 | 188 397 € | 366 006 € |
Riigi Tugiteenuste Keskus, toetatud projektid
Holdings in other companies
2
| Company | Code | Holding | Since | Revenue |
|---|---|---|---|---|
| O3 Inseneribüroo OÜ | 12321790 | 100,0% | 01.09.2023 | 665 k € |
| O3 Energy OÜ | 14291372 | 100,0% | 02.09.2023 | 2 560 € |
Business Register
Companies linked via the board
4
O3 Inseneribüroo OÜMats Viisileht, Mihkel Hiielaid665 k €AAMAVI OÜMats Viisileht38 669 €AHiimek OÜMihkel Hiielaid15 697 €AO3 Energy OÜMats Viisileht, Mihkel Hiielaid2 560 €A
Sorted by revenue (latest report or 4 quarters).
Top 20 in activity: Engineering activities and related technical consultancy
20
| # | Company | Revenue |
|---|---|---|
| 1 | Dornier Construction and Service GmbH Eesti filiaal | 12,3 m € |
| 2 | Osaühing Reaalprojekt | 5,5 m € |
| 3 | Skepast&Puhkim OÜ | 5,1 m € |
| 4 | Sweco Estonia AS | 4,8 m € |
| 5 | Innopolis Insenerid OÜ | 4,7 m € |
| 6 | K-Projekt Aktsiaselts | 4,4 m € |
| 7 | Inseneribüroo Telora OÜ | 4,3 m € |
| 8 | Osaühing SIRKEL&MALL | 3,7 m € |
| 9 | Projektibüroo OÜ | 3,4 m € |
| 10 | P.P. Ehitusjärelevalve OÜ | 3,4 m € |
| 11 | MistralWind OÜ | 3,3 m € |
| 12 | Novel Engineering OÜ | 2,9 m € |
| 13 | Roadplan OÜ | 2,7 m € |
| 14 | osaühing DMT Insenerid | 2,7 m € |
| 15 | Ingerop Estonia OÜ | 2,6 m € |
| 16 | Osaühing EstKONSULT | 2,5 m € |
| 17 | Klemmer OÜ | 2,5 m € |
| 18 | AS LNK Industries Eesti filiaal | 2,4 m € |
| 19 | StrongPartner OÜ | 2,4 m € |
| 20 | VMBH OÜ | 2,3 m € |
Revenue from the latest annual report, otherwise Tax Board revenue for 4 quarters. All companies in this activity
Licences, domains
4 records
Activity licences (MTR and environmental)
| Field | Licence number | Valid from |
|---|---|---|
| Projekteerimine | FPR000441 | 01.08.2023 |
| Elektritööd | TEL002925 | 22.02.2017 |
| Projekteerimine | EEP003746 | 30.11.2016 |
Domains
| Domain | Source |
|---|---|
| o3.ee | Business Register |
History and notices
17
| Date | Type | Content |
|---|---|---|
| 15.07.2026 | Entry | Muutmiskanne TsMS § 595¹ lg 1 alusel |
| 25.04.2025 | Entry | Amendment entry |
| 24.04.2024 | Entry | Amendment entry |
| 19.04.2024 | Entry | Amendment entry |
| 14.09.2023 | Entry | Amendment entry |
| 02.09.2023 | Entry | Amendment entry |
| 01.02.2023 | Entry | Muutmiskanne TsMS § 595¹ lg 1 alusel |
| 08.09.2022 | Entry | Amendment entry |
| 25.08.2022 | Order to remedy deficiencies | Amendment entry |
| 02.03.2020 | Entry | Amendment entry |
| 14.02.2018 | Entry | Amendment entry |
| 14.02.2018 | Order to remedy deficiencies | Amendment entry |
| 20.01.2018 | Entry | Amendment entry |
| 12.12.2017 | Entry | Amendment entry |
| 07.07.2017 | Entry | Amendment entry |
| 07.07.2017 | Order to remedy deficiencies | Amendment entry |
| 06.06.2016 | Entry | First entry |