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O3 Inseneribüroo OÜ

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RegisteredSaare County
Registry code
12321790
VAT number
EE101632351
Address
Saare maakond, Saaremaa vald, Kuressaare linn, Tolli tn 7, 93813
Registered
30.07.2012 · 14 yrs
Activity
Engineering activities and related technical consultancy 71121
Capital
2 500 €
Email
i•••@o•••.eeLog in to see
Phone
+372 5•• ••••Log in to see
Business Register 08.10.2026
Sales revenue665 k €-3%2025 annual report
Profit3 947 €2025 annual report
Employees17Tax Board 2026 Q2
Average gross salary2 457 €estimate, Tax Board 2026 Q2
Labour taxes per quarter63 903 €Tax Board 2026 Q2
Cash10 944 €Cash 31.12.2025, annual report
Tax debt0 €Tax Board debtor list 08.10.2026
Revenue 12 months655 k €-9%Tax Board, last 4 quarters
State taxes 12 months399 k €Tax Board, last 4 quarters
Tax debt since 26.09.2026 · ✓ no debt
Details ↓
Turnover by quarter · latest 163 tuh €
184 k187 k177 k172 k178 k147 k167 k163 k
III 24IV 24I 25II 25III 25IV 25I 26II 26
Chart ↓
Firmo rating
AA
Very good, low risk
81 / 100 points
CBBBBBBAAAAAA
View credit reportReport a debtHow the rating is calculatedCalculated 08.10.2026 · open data
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
RatingAA → A → AA
In tax debt0 days since 26.09.2026
Revenue 12 months▼ 9% vs a year earlier
Email right away on tax debt, bankruptcy or board change
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Data

Board and owners

2 persons
Number of active companies, tax debt and bankruptcy. Facts, not an assessment.
Board 2
Mats Viisileht4 companiesno tax debtPersonal ID ↗05.05.2025
Mihkel Hiielaid4 companiesno tax debtPersonal ID ↗05.05.2025
Shareholders 1
O3 Technology OÜ100,0% 2 500 €01.09.2023
Beneficial owners 2
Mats Viisileht4 companiesno tax debtmember of the senior management body, i.e. management or supervisory board member30.01.2026
Mihkel Hiielaid4 companiesno tax debtmember of the senior management body, i.e. management or supervisory board member30.01.2026

Business Register open data

Quarterly taxes and revenue

2026 Q2
State taxes / revenue60,1%
Labour taxes / revenue39,3%
Revenue per employee per month3 188 €
Gross salary (estimate)2 457 €
Net salary (estimate)2 001 €

2026 Q2. Wage is estimated from employment taxes.

Build report

QuarterRevenueChange y/yLabour taxesState taxesEmployees
2026 Q2162 595 €▼ 5%63 903 €97 773 €17
2026 Q1167 446 €▼ 5%61 687 €96 960 €16
2025 Q4146 997 €▼ 22%64 082 €94 252 €15
2025 Q3178 272 €▼ 3%74 145 €110 452 €16
2025 Q2171 754 €▲ 21%86 573 €129 115 €18
2025 Q1176 976 €▲ 16%73 991 €110 999 €18
2024 Q4187 297 €▲ 33%46 367 €68 446 €18
2024 Q3184 364 €▲ 13%57 789 €103 655 €20
2024 Q2142 177 €▼ 7%76 074 €103 842 €14
2024 Q1152 962 €▼ 1%40 149 €56 535 €15
2023 Q4140 954 €▼ 7%55 270 €79 193 €14
2023 Q3163 782 €▲ 60%65 986 €93 675 €14
Show full history (18 quarters)
2023 Q2153 564 €▼ 7%57 605 €83 468 €16
2023 Q1155 024 €▲ 9%62 051 €88 218 €15
2022 Q4150 874 €50 343 €76 607 €14
2022 Q3102 479 €55 297 €70 917 €15
2022 Q2164 272 €55 586 €82 759 €15
2022 Q1142 341 €53 652 €76 831 €18

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
Build report

20252024202320222021
Sales revenue665 k €▼ 3%683 k €▲ 14%599 k €▲ 7%562 k €▲ 40%401 k €
Profit3 947 €▲ into profit-2 905 €▼ into loss22 493 €▲ 33×685 €▲ into profit-134 k €
Profit margin0,6%-0,4%3,8%0,1%-33,5%
Retained earnings49 449 €▼ 6%52 354 €▲ 75%29 861 €▲ 2%29 176 €▼ 82%164 k €
Cash10 944 €▲ 426%2 079 €▼ 48%4 030 €▼ 94%71 686 €▲ 331%16 631 €
Current assets138 k €▼ 36%216 k €▲ 71%126 k €▲ 24%101 k €▲ 10%92 244 €
Fixed assets0 €▼ 100%2 181 €▼ 79%10 597 €▼ 19%13 067 €▼ 26%17 739 €
Assets138 k €▼ 37%218 k €▲ 59%137 k €▲ 19%115 k €▲ 4%110 k €
Current liabilities82 216 €▼ 50%166 k €▲ 128%72 896 €▼ 11%82 155 €▲ 5%78 307 €
Long-term liabilities—0 €▼ 100%9 000 €—0 €
Total liabilities82 216 €▼ 50%166 k €▲ 103%81 896 €0%82 155 €▲ 5%78 307 €
Equity55 896 €▲ 8%51 949 €▼ 5%54 854 €▲ 70%32 361 €▲ 2%31 676 €
Labour costs-613 k €▲ 2%-625 k €▼ 12%-559 k €▼ 4%-538 k €▼ 17%-458 k €
Employees14▲ 56%9▼ 36%14▼ 7%15▲ 15%13
Filed30.06.202630.06.202516.04.202429.06.202305.05.2022
ReportPDF ↓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
ActivityEMTAKSales revenueOsa
Engineering activities and related technical consultancy main activity71121664 849 €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 08.10.2026

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

none

No transactions with state agencies, procurement contracts or grants found

RTK Saldo, Riigihangete register, RTK toetatud projektid

Holdings in other companies

0

No holdings in other companies

Companies linked via the board

4
O3 Technology OÜMats Viisileht, Mihkel Hiielaid1,5 m €AAAMAVI 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
#CompanyRevenue
1Dornier Construction and Service GmbH Eesti filiaal12,3 m €
2Osaühing Reaalprojekt5,5 m €
3Skepast&Puhkim OÜ5,1 m €
4Sweco Estonia AS4,8 m €
5Innopolis Insenerid OÜ4,7 m €
6K-Projekt Aktsiaselts4,4 m €
7Inseneribüroo Telora OÜ4,3 m €
8Osaühing SIRKEL&MALL3,7 m €
9Projektibüroo OÜ3,4 m €
10P.P. Ehitusjärelevalve OÜ3,4 m €
11MistralWind OÜ3,3 m €
12Novel Engineering OÜ2,9 m €
13Roadplan OÜ2,7 m €
14osaühing DMT Insenerid2,7 m €
15Ingerop Estonia OÜ2,6 m €
16Osaühing EstKONSULT2,5 m €
17Klemmer OÜ2,5 m €
18AS LNK Industries Eesti filiaal2,4 m €
19StrongPartner OÜ2,4 m €
20VMBH OÜ2,3 m €

O3 Inseneribüroo OÜ: place 77 /1872

Similar size: Osaühing Resand, Hepta Group Energy OÜ, KPR-Services OÜ, Osaühing Entec Eesti, Osaühing Termopilt, Eesti Soojustusprojekt OÜ, OÜ EMP A&I, Weidenberg OÜ, Kajaja Acoustics OÜ, OÜ EULE

Revenue from the latest annual report, otherwise Tax Board revenue for 4 quarters. All companies in this activity

Tegevusload

4 records

Activity licences (MTR and environmental)

FieldLicence numberValid from
Valveseadmestiku projekteerimine, paigaldamine ja hooldamineTTV00005321.04.2025
ProjekteerimineFPR00041408.02.2024
ElektritöödTEL00217012.07.2013
ProjekteerimineEEP00261722.02.2013

History and notices

20
DateTypeContent
05.05.2025EntryAmendment entry
06.05.2024EntryAmendment entry
22.04.2024Order to remedy deficienciesAmendment entry
01.09.2023EntryAmendment entry
11.07.2023EntryAmendment entry
17.01.2018EntryAmendment entry
22.12.2017EntryAmendment entry
19.12.2017EntryAmendment entry
02.12.2017EntryAmendment entry
31.01.2017EntryAmendment entry
15.09.2016EntryAmendment entry
31.05.2016EntryAmendment entry
27.07.2015EntryAmendment entry
08.07.2014EntryAmendment entry
27.05.2014EntryMuutmiskanne ÄS § 525 lg 2 alusel
06.03.2013EntryAmendment entry
26.02.2013Order to remedy deficienciesAmendment entry
16.10.2012Negative entry order: deficiencies not remediedAmendment entry
10.09.2012Order to remedy deficienciesAmendment entry
30.07.2012EntryFirst entry