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Search›Companies›Si&Ko OÜ
16017633ActivePrivate limited companyEE102275380 · VAT-registered

Si&Ko OÜ

Harju maakond, Tallinn, Lasnamäe linnaosa, Peterburi tee 34·EMTAK 43221 — Installation, maintenance and repair of heating, ventilation and air conditioning equipment·6+ years
Andmed · ···
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Overview

e-Business Register · 17 h ago
Registry code
e-Business Register
Legal form
Private limited company
Registered
28.07.2020e-Business Register
Address
Peterburi tee 34, Lasnamäe linnaosa, Tallinn, 11415 Harju maakondADS · e-Business Register
E-mail address
info@siko.eee-Business Register
Telephone
+372 5051619· Telia Eesti ASe-Business Register · TTJA NBA
Principal activity
EMTAK 43221 - Installation, maintenance and repair of heating, ventilation and air conditioning equipmente-Business Register · ETCB
VAT number
ETCB · VAT-registered
Share capital
2500,00 €e-Business Register
Estonia's public business register
HomeViewsIndustriesBlogSourcesAbout

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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© 2026 Nimistu MTÜ. License CC-BY-SA 4.0 · details
Data · 9 sourcese-Business Register · 8 min agoMTARTKOfficial Notices
e-Business Register ↗

Registered 28. juuli 2020, primary activity: Installation, maintenance and repair of heating, ventilation and air conditioning equipment. Main place of business in Lasnamäe linnaosa, Tallinn, Harju maakond.

Revenue 2026 II kv
43 828 €
▲ 38% vs 2025 II kv
As of 10.07.2026 (MTA)
Employees
2
2026 (MTA)
Taxes paid
14 069 €
State + labour taxes · 2026 II kv
Tax debt
9110,42 €
As of 09.08.2026 (MTA)
Revenue 2026 (I-II kv)
49k €
▼ 3% vs 2025 I-II kv
As of 10.07.2026 (MTA)
Employees
2
2026 (MTA)
Taxes paid
21k €
State + labour taxes · 2026 (I-II kv)
Tax debt
9110,42 €
As of 09.08.2026 (MTA)

Tax debt over time

MTA · last 365 d
Current 9110,42 €max 10k €
11 May 202625 Jun 202610 Aug 2026
30 days
+3k €
5615,00 € → 9110,42 €
90 days
+7k €
2386,56 € → 9110,42 €
365 days
–
no data yet

Officers

e-Business Register · 17 h ago
DS
Dagmar Siida
Born 1972 · 53 y · board member since 28.07.2020
Board member

Founders

e-Business Register · 17 h ago
DS
Dagmar Siida
Born 1972 · 53 y · founder since 22.07.2020
Founder · 3k €

Shareholders

e-Business Register · 17 h ago
DS
Dagmar Siida
Born 1972 · 53 y · shareholder since 01.09.2023
Shareholder 100% · 3k €

Annual reports (3)

e-Business Register · annual reports · 4 päeva tagasi
Revenue 2023
289k €
↗ +19.6% vs 2022
State taxes 2025
28k €
↘ -43.4% vs 2024
Employees 2023
2
↘ -33.3% vs 2022
YearRevenueProfitEquityAssetsEmployees
2023288 862 €20 979 €21k €38k €202.12.2024
2022241 433 €3173 €3k €4k €319.03.2024
2021320 115 €5490 €5k €13k €219.03.2024
Original files in PDF – the full register on e-Business Register.View reports on e-Business Register

Taxes, revenue and employees

Estonian Tax and Customs Board · 10.07.2026 as of
100k €50k €0
20222023202420252026
YearRevenue (a)State taxesTaxes on workforceEmployees (Q4)
2026I-II Q48 961 €11 608 €9128 €2
202583 193 €27 621 €17 143 €2
2024158 508 €48 833 €33 048 €2
2023229 317 €44 568 €22 913 €2
2022162 456 €46 528 €
Quarterly breakdown
YearQ1Q2Q3Q4
Revenue 20265k €44k €––
State taxes 20264k €8k €––
Taxes on workforce 20263k €6k €––
Employees 202622––
Revenue 202519k €32k €24k €9k €
State taxes 20259k €7k €

Official notices (3)

Ametlikud Teadaanded · 1 päeva tagasi
Maksu- ja Tolliameti dokumendi kättetoimetamise teade - üldine vorm (MKS § 55)
Maksu- ja Tolliamet · 2628514
27.07.2026
Maksu- ja Tolliameti dokumendi kättetoimetamise teade - üldine vorm (MKS § 55)
Maksu- ja Tolliamet · 2623616
14.07.2026
Maksu- ja Tolliameti dokumendi kättetoimetamise teade - üldine vorm (MKS § 55)
Maksu- ja Tolliamet · 2621584
09.07.2026

Tech stack

Tehnoloogiad
Mobile carrier
+372 5051619Telia Eesti AS

State-sector payments (9 · 41k €)

RTK Makseandmik · 15.05.2026
Transactions
9
2024–2026 · 3 years
Total amount
41k €
avg 5k €
Buyers
2
State and municipal bodies
Latest
06.03.2026
1k € · Riigi Kinnisvara AS

2026: 1k € · 2025: 24k € · 2024: 16k €

BuyerTxAmountShare
Riigilaevastik
77001814
5
36k €
Riigi Kinnisvara AS
10788733
4
5k €
20261 transaction · 1k €
06.032026
Riigi Kinnisvara AS10788733
MAJANDAMISKULUD · Muud üldised teenused
1281 €
20254 transactions · 18k €
24.102025
Riigilaevastik77001814
MAJANDAMISKULUD · Veetransport
7998 €
17.042025
Riigilaevastik77001814

History

last 2 years · MTA + ÄR + MTR + Procurements
2026
05.08.2026TaxMaksuvõlg vähenes— −1005 € (jäänud 9110 €)
01.08.2026TaxMaksuvõlg kasvas— +2844 € (kokku 10 115 €)
15.07.2026TaxMaksuvõlg kasvas— +1656 € (kokku 7271 €)
16.06.2026TaxMaksuvõlg kasvas— +25 € (kokku 5615 €)
15.06.2026FilingMuutmiskanne2×expand ›hide ⌃
  • Ä 50150564 / 4 · Olek: Jõustunud
  • Kanne nr 4 · kanne
04.06.2026TaxMaksuvõlg kasvas— +3203 € (kokku 5590 €)
11.05.2026TaxMaksuvõlg kasvas— +2387 € (kokku 2387 €)
2024
02.12.2024ReportEsitati 2023. aasta aruanne— Käive 288 862 €
05.09.2024FilingHoiatusmäärus registrist kustutamiseks: majandusaasta aruanne esitamata— Ä 50150564 / M4 · Olek: Puudused kõrvaldatud

Connected companies

Same-person ties · e-Business Register

Si&Ko OÜ is connected to 5 other companies through 1 person who hold a role here and elsewhere. The strongest tie runs through Dagmar Siida (5 companies).

Total connections
5
via 1 person
Connecting people
1
Active here
Distinct roles
3
Board member · Founder
Strongest tie
Dagmar
5 companies
Via personDagmar Siida5
DS
Dagmar Siida
board member, founder, shareholder 100%
5 other companies›
CompanyRoleReg. code
Ajaviide OÜ
Board memberShareholder 100%Founder
16105793
Dagmar Siida
Sole trader
30 506 €
2
7k €
4k €
Taxes on workforce 20256k €3k €4k €3k €
Employees 20252222
Revenue 202459k €39k €33k €27k €
State taxes 202413k €13k €12k €12k €
Taxes on workforce 20248k €8k €8k €8k €
Employees 20242222
Revenue 202354k €62k €17k €97k €
State taxes 202312k €8k €8k €17k €
Taxes on workforce 20236k €6k €6k €6k €
Employees 20232222
Revenue 202259k €59k €18k €27k €
State taxes 202217k €12k €9k €8k €
Taxes on workforce 20228k €8k €9k €6k €
Employees 20224442
MAJANDAMISKULUD
·
Veetransport
5307 €
06.032025
Riigi Kinnisvara AS10788733
MAJANDAMISKULUD · Muud üldised teenused
1201 €
10.022025
Riigilaevastik77001814
MAJANDAMISKULUD · Veetransport
3355 €
Show remaining 4 transactions+
20251 transaction · 6k €
24.012025
Riigilaevastik77001814
MAJANDAMISKULUD · Veetransport
5697 €
20243 transactions · 16k €
28.082024
Riigilaevastik77001814
MAJANDAMISKULUD · Veetransport
13 298 €
23.052024
Riigi Kinnisvara AS10788733
MAJANDAMISKULUD · Muud üldised teenused
1092 €
13.052024
Riigi Kinnisvara AS10788733
MAJANDAMISKULUD · Muud üldised teenused
1403 €
11747334
Jõgeva vald, Kuremaa alevik, Palamuse tee 1 korteriühistu
Board member
80517214
Pärnu linn, Aia tn 22 korteriühistu
Board member
80235591
Ristirästik OÜ
Shareholder 100%FounderBoard member
17104904

Analysis · 2023

computed from annual reports
Revenue289k €median 97k €3.0× the sector median
Net margin7.3%median 2.9%+4.4 pp vs sector median
Revenue per employee144k €median 82k €1.8× the sector median
Revenue change19.6%median 0.1%+19.6 pp vs sector median
Equity ratio55.2%
Current ratio2.23
Labour cost of revenue23.2%
Profit per employee10 490 €
Compared with2022revenue 241k €

Peer group: Kütte-, ventilatsiooni- ja kliimaseadmete paigaldus, 769 trading companies that filed a report in the last three years.

Founded 2020. That year 15,799 osaühing were registered; 15,242 are still trading, or 96.5%.