O3 Inseneribüroo OÜ

Active Registry code 12321790 OÜ Kuressaare linn Registered 30 Jul 2012
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O3 Inseneribüroo OÜ is a OÜ based in Kuressaare linn, registry code 12321790, status: active. Main activity: Constructional engineering-technical designing and consulting. According to EMTA, turnover for Q3 2026 was €164 030 with 17 employees.

Turnover
164 030 €
↑ 0.9% vs Q2 2026
State taxes
93 371 €
↓ 4.5% vs Q2 2026
Labour taxes
58 969 €
↓ 7.7% vs Q2 2026
Employees
17
±0 vs Q2 2026

Q3 2026 · data from the Tax and Customs Board (EMTA)

Position in the industry Architectural and engineering activities; technical testing and analysis · EMTAK 71

  • Turnover · Q3 2026 164 030 €
    industry median 16 250 € · companies in the industry: 2 781
  • Labour taxes per employee 3 469 €
    industry median 1 751 € · companies in the industry: 1 910
  • Revenue · 2025 664 849 €
    industry median 23 548 € · companies in the industry: 4 824
  • Net profit margin · 2025 0.6 %
    industry median 15.1 % · companies in the industry: 3 876

Taxes and turnover

Q4 2023 – Q3 2026
Turnover, € thousand Q3 2026: 164 030 € · +0.9% vs Q2 2026 · industry median 16 250 € · above 92% of the industry
050100150200Q4 2023 Company: 140 954 € Industry median: 17 217 €Q4·23Q1 2024 Company: 152 962 € Industry median: 15 638 €Q2 2024 Company: 142 177 € Industry median: 15 992 €Q2·24Q3 2024 Company: 184 364 € Industry median: 16 330 €Q4 2024 Company: 187 297 € Industry median: 17 266 €Q4·24Q1 2025 Company: 176 976 € Industry median: 15 215 €Q2 2025 Company: 171 754 € Industry median: 16 150 €Q2·25Q3 2025 Company: 178 272 € Industry median: 16 910 €Q4 2025 Company: 146 997 € Industry median: 17 310 €Q4·25Q1 2026 Company: 167 446 € Industry median: 15 906 €Q2 2026 Company: 162 595 € Industry median: 16 256 €Q2·26Q3 2026 Company: 164 030 € Industry median: 16 250 €Q3·26050100150200Q4 2024 Company: 187 297 € Industry median: 17 266 €Q1 2025 Company: 176 976 € Industry median: 15 215 €Q1·25Q2 2025 Company: 171 754 € Industry median: 16 150 €Q3 2025 Company: 178 272 € Industry median: 16 910 €Q3·25Q4 2025 Company: 146 997 € Industry median: 17 310 €Q1 2026 Company: 167 446 € Industry median: 15 906 €Q1·26Q2 2026 Company: 162 595 € Industry median: 16 256 €Q3 2026 Company: 164 030 € Industry median: 16 250 €Q3·26
  • Company
  • Industry median

Industry: Architectural and engineering activities; technical testing and analysis (the EMTAK division of the main activity). Median: half of the industry is above, half below.

Labour taxes per employee, € Q3 2026: 3 469 € · −7.7% vs Q2 2026 · industry median 1 751 € · above 80% of the industry
02 0004 0006 000Q4 2023 Company: 3 948 € Industry median: 1 648 €Q4·23Q1 2024 Company: 2 677 € Industry median: 1 639 €Q2 2024 Company: 5 434 € Industry median: 1 671 €Q2·24Q3 2024 Company: 2 889 € Industry median: 1 753 €Q4 2024 Company: 2 576 € Industry median: 1 750 €Q4·24Q1 2025 Company: 4 111 € Industry median: 1 767 €Q2 2025 Company: 4 810 € Industry median: 1 758 €Q2·25Q3 2025 Company: 4 634 € Industry median: 1 847 €Q4 2025 Company: 4 272 € Industry median: 1 847 €Q4·25Q1 2026 Company: 3 855 € Industry median: 1 780 €Q2 2026 Company: 3 759 € Industry median: 1 758 €Q2·26Q3 2026 Company: 3 469 € Industry median: 1 751 €Q3·2601 0002 0003 0004 0005 000Q4 2024 Company: 2 576 € Industry median: 1 750 €Q1 2025 Company: 4 111 € Industry median: 1 767 €Q1·25Q2 2025 Company: 4 810 € Industry median: 1 758 €Q3 2025 Company: 4 634 € Industry median: 1 847 €Q3·25Q4 2025 Company: 4 272 € Industry median: 1 847 €Q1 2026 Company: 3 855 € Industry median: 1 780 €Q1·26Q2 2026 Company: 3 759 € Industry median: 1 758 €Q3 2026 Company: 3 469 € Industry median: 1 751 €Q3·26
  • Company
  • Industry median

Industry: Architectural and engineering activities; technical testing and analysis (the EMTAK division of the main activity). Median: half of the industry is above, half below.

Employees Q3 2026: 17 · +0.0% vs Q2 2026
05101520Q4 2023 Company: 14Q4·23Q1 2024 Company: 15Q2 2024 Company: 14Q2·24Q3 2024 Company: 20Q4 2024 Company: 18Q4·24Q1 2025 Company: 18Q2 2025 Company: 18Q2·25Q3 2025 Company: 16Q4 2025 Company: 15Q4·25Q1 2026 Company: 16Q2 2026 Company: 17Q2·26Q3 2026 Company: 17Q3·2605101520Q4 2024 Company: 18Q1 2025 Company: 18Q1·25Q2 2025 Company: 18Q3 2025 Company: 16Q3·25Q4 2025 Company: 15Q1 2026 Company: 16Q1·26Q2 2026 Company: 17Q3 2026 Company: 17Q3·26
State taxes, € thousand Q3 2026: 93 371 € · −4.5% vs Q2 2026
050100150Q4 2023 Company: 79 193 €Q4·23Q1 2024 Company: 56 535 €Q2 2024 Company: 103 842 €Q2·24Q3 2024 Company: 103 655 €Q4 2024 Company: 68 446 €Q4·24Q1 2025 Company: 110 999 €Q2 2025 Company: 129 115 €Q2·25Q3 2025 Company: 110 452 €Q4 2025 Company: 94 252 €Q4·25Q1 2026 Company: 96 960 €Q2 2026 Company: 97 773 €Q2·26Q3 2026 Company: 93 371 €Q3·26050100150Q4 2024 Company: 68 446 €Q1 2025 Company: 110 999 €Q1·25Q2 2025 Company: 129 115 €Q3 2025 Company: 110 452 €Q3·25Q4 2025 Company: 94 252 €Q1 2026 Company: 96 960 €Q1·26Q2 2026 Company: 97 773 €Q3 2026 Company: 93 371 €Q3·26
Figures by quarter
Quarter Turnover, € State taxes, € Labour taxes, € Employees
Q3 2026 164 030 93 371 58 969 17
Q2 2026 162 595 97 773 63 903 17
Q1 2026 167 446 96 960 61 687 16
Q4 2025 146 997 94 252 64 082 15
Q3 2025 178 272 110 452 74 145 16
Q2 2025 171 754 129 115 86 573 18
Q1 2025 176 976 110 999 73 991 18
Q4 2024 187 297 68 446 46 367 18
Q3 2024 184 364 103 655 57 789 20
Q2 2024 142 177 103 842 76 074 14
Q1 2024 152 962 56 535 40 149 15
Q4 2023 140 954 79 193 55 270 14
Q3 2023 163 782 93 675 65 986 14
Q2 2023 153 564 83 468 57 605 16
Q1 2023 155 024 88 218 62 051 15
Q4 2022 150 874 76 607 50 343 14
Q3 2022 102 479 70 917 55 297 15
Q2 2022 164 272 82 759 55 586 15
Q1 2022 142 341 76 831 53 652 18
Labour taxes per employee per month
1 156 €
Turnover per employee in the quarter
9 649 €

Q3 2026 · calculated from EMTA data

Financials by year

2016 – 2025
Revenue, € thousand 2025: 664 849 € · −2.7% vs 2024 · industry median 23 548 € · above 98% of the industry
02004006008002016 Company: — Industry median: —20162017 Company: — Industry median: —20172018 Company: — Industry median: —20182019 Company: 529 335 € Industry median: 23 879 €20192020 Company: 546 784 € Industry median: 21 696 €20202021 Company: 401 292 € Industry median: 23 290 €20212022 Company: 561 799 € Industry median: 23 304 €20222023 Company: 598 660 € Industry median: 22 720 €20232024 Company: 683 447 € Industry median: 22 098 €20242025 Company: 664 849 € Industry median: 23 548 €202502004006008002018 Company: — Industry median: —2019 Company: 529 335 € Industry median: 23 879 €20192020 Company: 546 784 € Industry median: 21 696 €2021 Company: 401 292 € Industry median: 23 290 €20212022 Company: 561 799 € Industry median: 23 304 €2023 Company: 598 660 € Industry median: 22 720 €20232024 Company: 683 447 € Industry median: 22 098 €2025 Company: 664 849 € Industry median: 23 548 €2025
  • Company
  • Industry median

Industry: Architectural and engineering activities; technical testing and analysis (the EMTAK division of the main activity). Median: half of the industry is above, half below.

Net profit, € thousand 2025: 3 947 € · +235.9% vs 2024 · industry median 1 536 € · above 57% of the industry
-150-100-500502016 Company: — Industry median: —20162017 Company: — Industry median: —20172018 Company: — Industry median: —20182019 Company: 21 665 € Industry median: 2 331 €20192020 Company: 25 945 € Industry median: 2 183 €20202021 Company: -134 465 € Industry median: 2 742 €20212022 Company: 685 € Industry median: 1 794 €20222023 Company: 22 493 € Industry median: 2 165 €20232024 Company: -2 905 € Industry median: 1 691 €20242025 Company: 3 947 € Industry median: 1 536 €2025-150-100-500502018 Company: — Industry median: —2019 Company: 21 665 € Industry median: 2 331 €20192020 Company: 25 945 € Industry median: 2 183 €2021 Company: -134 465 € Industry median: 2 742 €20212022 Company: 685 € Industry median: 1 794 €2023 Company: 22 493 € Industry median: 2 165 €20232024 Company: -2 905 € Industry median: 1 691 €2025 Company: 3 947 € Industry median: 1 536 €2025
  • Company
  • Industry median

Industry: Architectural and engineering activities; technical testing and analysis (the EMTAK division of the main activity). Median: half of the industry is above, half below.

Net profit margin, % 2025: 0.6 % · +1.0 pp vs the year before · industry median 15.1 % · above 29% of the industry
-40-200202016 Company: — Industry median: —20162017 Company: — Industry median: —20172018 Company: — Industry median: —20182019 Company: 4.1 % Industry median: 16.3 %20192020 Company: 4.7 % Industry median: 16.8 %20202021 Company: -33.5 % Industry median: 19.6 %20212022 Company: 0.1 % Industry median: 16.6 %20222023 Company: 3.8 % Industry median: 17.1 %20232024 Company: -0.4 % Industry median: 15.3 %20242025 Company: 0.6 % Industry median: 15.1 %2025-40-200202018 Company: — Industry median: —2019 Company: 4.1 % Industry median: 16.3 %20192020 Company: 4.7 % Industry median: 16.8 %2021 Company: -33.5 % Industry median: 19.6 %20212022 Company: 0.1 % Industry median: 16.6 %2023 Company: 3.8 % Industry median: 17.1 %20232024 Company: -0.4 % Industry median: 15.3 %2025 Company: 0.6 % Industry median: 15.1 %2025
  • Company
  • Industry median

Industry: Architectural and engineering activities; technical testing and analysis (the EMTAK division of the main activity). Median: half of the industry is above, half below.

Assets, € thousand 2025: 138 112 € · −36.6% vs 2024
0501001502002502016 Company: —20162017 Company: —20172018 Company: —20182019 Company: 235 696 €20192020 Company: 234 991 €20202021 Company: 109 983 €20212022 Company: 114 516 €20222023 Company: 136 750 €20232024 Company: 217 846 €20242025 Company: 138 112 €20250501001502002502018 Company: —2019 Company: 235 696 €20192020 Company: 234 991 €2021 Company: 109 983 €20212022 Company: 114 516 €2023 Company: 136 750 €20232024 Company: 217 846 €2025 Company: 138 112 €2025
Equity, € thousand 2025: 55 896 € · +7.6% vs 2024
0501001502002016 Company: —20162017 Company: —20172018 Company: —20182019 Company: 178 271 €20192020 Company: 166 141 €20202021 Company: 31 676 €20212022 Company: 32 361 €20222023 Company: 54 854 €20232024 Company: 51 949 €20242025 Company: 55 896 €20250501001502002018 Company: —2019 Company: 178 271 €20192020 Company: 166 141 €2021 Company: 31 676 €20212022 Company: 32 361 €2023 Company: 54 854 €20232024 Company: 51 949 €2025 Company: 55 896 €2025
Employees 2025: 14 · +55.6% vs 2024 · industry median 1 · above 98% of the industry
051015202016 Company: 15 Industry median: —20162017 Company: 17 Industry median: —20172018 Company: 13 Industry median: 120182019 Company: 14 Industry median: 120192020 Company: 13 Industry median: 120202021 Company: 13 Industry median: 120212022 Company: 15 Industry median: 120222023 Company: 14 Industry median: 120232024 Company: 9 Industry median: 120242025 Company: 14 Industry median: 120250510152018 Company: 13 Industry median: 12019 Company: 14 Industry median: 120192020 Company: 13 Industry median: 12021 Company: 13 Industry median: 120212022 Company: 15 Industry median: 12023 Company: 14 Industry median: 120232024 Company: 9 Industry median: 12025 Company: 14 Industry median: 12025
  • Company
  • Industry median

Industry: Architectural and engineering activities; technical testing and analysis (the EMTAK division of the main activity). Median: half of the industry is above, half below.

Financials by year
Year Revenue, € Net profit, € Labour costs, € Assets, € Equity, € Employees
2025 664 849 3 947 613 352 138 112 55 896 14
2024 683 447 -2 905 625 490 217 846 51 949 9
2023 598 660 22 493 559 152 136 750 54 854 14
2022 561 799 685 538 130 114 516 32 361 15
2021 401 292 -134 465 458 001 109 983 31 676 13
2020 546 784 25 945 383 052 234 991 166 141 13
2019 529 335 21 665 411 751 235 696 178 271 14
2018 — — — — — 13
2017 — — — — — 17
2016 — — — — — 15
2015 — — — — — 10
2014 — — — — — 5
2013 — — — — — 3

Figures from the company’s own (non-consolidated) balance sheet and income statement. A loss is shown with a minus sign.

Financial ratios for 2025

Net profit margin
0.6 %
Net profit / revenue
Return on equity (ROE)
7.1 %
Net profit / equity
Return on assets (ROA)
2.9 %
Net profit / assets
Equity ratio
40.5 %
Equity / assets
Debt ratio
59.5 %
Liabilities / assets
Current ratio
1.68
Current assets / current liabilities
Revenue per employee
47 489 €
Revenue / average full-time employees
Labour cost per employee per month
3 651 €
Labour costs / employees / 12 months (incl. employer taxes)

Annual reports

PDFs from e-Äriregister
Annual reports
Year Period Filed Report Documents
2025 1 Jan 2025 – 31 Dec 2025 30 Jun 2026 Company’s own e-Äriregister
2024 1 Jan 2024 – 31 Dec 2024 30 Jun 2025 Company’s own e-Äriregister
2023 1 Jan 2023 – 31 Dec 2023 16 Apr 2024 Company’s own e-Äriregister
2022 1 Jan 2022 – 31 Dec 2022 29 Jun 2023 Company’s own e-Äriregister
2021 1 Jan 2021 – 31 Dec 2021 5 May 2022 Company’s own e-Äriregister
2020 1 Jan 2020 – 31 Dec 2020 11 Jun 2021 Company’s own e-Äriregister
2019 1 Jan 2019 – 31 Dec 2019 17 Apr 2020 Company’s own e-Äriregister

Board

Right of representation

Any member of the management board may represent the private limited company in all transactions.

Owners

Beneficial owners

  • Mats Viisileht
    Member of a senior management body (management or supervisory board) · since 30 Jan 2026
  • Mihkel Hiielaid
    Member of a senior management body (management or supervisory board) · since 30 Jan 2026

Founders and other persons

  • Mikk Tasa
    Founder · 2 500 € · 30 Jul 2012
shared board members, owners or beneficial owners

Activities (EMTAK)

  • 71121Constructional engineering-technical designing and consulting Main

Rulings 20

All rulings (PDF)
Rulings
Number, date Title Deadline State Document
Ä 10171940 / 17
5 May 2025
 Amendment entry In force
5 May 2025
 PDF
Ä 10171940 / 16
6 May 2024
 Amendment entry In force
6 May 2024
 PDF
Ä 10171940 / M3
22 Apr 2024
 Ruling to eliminate deficiencies 7 May 2024 Deficiencies eliminated
29 Apr 2024
 PDF
Ä 10171940 / 15
1 Sep 2023
 Amendment entry In force
1 Sep 2023
 PDF
Ä 10171940 / 14
11 Jul 2023
 Amendment entry In force
11 Jul 2023
 PDF
Ä 10171940 / 13
17 Jan 2018
 Amendment entry In force
17 Jan 2018
 PDF
Ä 10171940 / 12
22 Dec 2017
 Amendment entry In force
22 Dec 2017
 PDF
Ä 10171940 / 11
19 Dec 2017
 Amendment entry In force
19 Dec 2017
 PDF
Ä 10171940 / 10
2 Dec 2017
 Amendment entry In force
2 Dec 2017
 PDF
Ä 10171940 / 9
31 Jan 2017
 Amendment entry In force
31 Jan 2017
 PDF
Ä 10171940 / 8
15 Sep 2016
 Amendment entry In force
15 Sep 2016
 PDF
Ä 10171940 / 7
31 May 2016
 Amendment entry In force
31 May 2016
 PDF
Ä 10171940 / 6
27 Jul 2015
 Amendment entry In force
27 Jul 2015
 PDF
Ä 10171940 / 5
8 Jul 2014
 Amendment entry In force
8 Jul 2014
 PDF
Ä 10171940 / 4
27 May 2014
 Amendment under Commercial Code § 525 (2) In force
27 May 2014
 PDF
Ä 10171940 / 3
6 Mar 2013
 Amendment entry In force
6 Mar 2013
 PDF
Ä 10171940 / M2
26 Feb 2013
 Ruling to eliminate deficiencies 28 Mar 2013 In force
26 Feb 2013
 PDF
Ä 10171940 / 2
16 Oct 2012
 Entry refused: deficiencies not eliminated In force
24 Oct 2012
 PDF
Ä 10171940 / M1
10 Sep 2012
 Ruling to eliminate deficiencies 10 Oct 2012 In force
10 Sep 2012
 PDF
Ä 10171940
30 Jul 2012
 First entry In force
30 Jul 2012
 PDF

Sources: e-Äriregister and EMTA. Data updated 2 Nov 2026. Open at the source ↗ · Report an error in the data