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Search›Companies›osaühing Serioso
10074034ActivePrivate limited company

osaühing Serioso

Harju maakond, Tallinn, Kesklinna linnaosa, Tornimäe tn 7-9·EMTAK 70201 — Business and other management consultancy activities·29+ years
Andmed · ···
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Overview

e-Business Register · 17 h ago
Registry code
e-Business Register
Legal form
Private limited company
Registered
26.08.1996e-Business Register
Address
Tornimäe tn 7-9, Kesklinna linnaosa, Tallinn, 10145 Harju maakondADS · e-Business Register
E-mail address
marina@datanet.eee-Business Register
Telephones
+372 5021484· Telia Eesti AS+372 6309139· OÜ CSC Telecom Estoniae-Business Register · TTJA NBA
Principal activity
EMTAK 70201 - Business and other management consultancy activitiese-Business Register · ETCB
Share capital
2556,00 €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
  • Recent registrations

Data

  • 72 sources
  • Database
  • Extensions
  • MCP

Organisation

  • About
  • For journalists
  • Donation terms
  • Refunds
  • Terms
  • Privacy
  • Contact
© 2026 Nimistu MTÜ. License CC-BY-SA 4.0 · details
Revenue 2025
7692 €
▼ 61% vs 2023
As of 10.04.2026 (MTA)
Employees
–
2025 (MTA)
Taxes paid
3755 €
State + labour taxes · 2025 (I kv)
Tax debt
0 €
As of 25.06.2026 (MTA)

Registered 26. august 1996, primary activity: Business and other management consultancy activities. Main place of business in Kesklinna linnaosa, Tallinn, Harju maakond.

Data · 7 sourcese-Business Register · 6 min agoMTA
e-Business Register ↗
Revenue 2025
8k €
▼ 61% vs 2023
As of 10.04.2026 (MTA)
Employees
–
2025 (MTA)
Taxes paid
4k €
State + labour taxes · 2025 (I kv)
Tax debt
€0
As of 25.06.2026 (MTA)

Officers

e-Business Register · 17 h ago
MK
Marina Kaas
Born 1958 · 67 y · board member since 26.08.1996
Board member

Founders

e-Business Register · 17 h ago
MK
Marina Kaas
Born 1958 · 67 y · founder since 26.08.1996
Founder

Shareholders

e-Business Register · 17 h ago
MK
Marina Kaas
Born 1958 · 67 y · shareholder since 01.09.2023
Shareholder 100% · 3k €

Beneficial owners

e-Business Register · 17 h ago
MK
Marina Kaas
Born 1958 · 67 y · ultimate beneficial owner since 20.02.2019
Ultimate beneficial owner

Subsidiaries

e-Business Register · shareholders · 17 h ago

osaühing Serioso is a shareholder or officer in 1 more company.

MANNET PARTNERS BALTICS Osaühing
Shareholder 49%

Annual reports (6)

e-Business Register · annual reports · 5 päeva tagasi
Revenue 2024
8k €
↘ -61.1% vs 2023
Employees 2024
0
YearRevenueProfitEquityAssetsEmployees

Taxes and employees

Estonian Tax and Customs Board · 10.04.2026 as of
YearRevenue (a)State taxesTaxes on workforceEmployees (Q4)
2025—3755 €0 €–
2024—2397 €420 €–
2023—1417 €373 €–
2022—1897 €420 €

Tech stack

Tehnoloogiad
Mobile carrier
+372 5021484Telia Eesti AS+372 6309139OÜ CSC Telecom Estonia

History

last 2 years · MTA + ÄR + MTR + Procurements
2025
28.06.2025ReportEsitati 2024. aasta aruanne— Käive 7692 €
2024
01.08.2024ReportEsitati 2023. aasta aruanne— Käive 19 754 €
06.07.2024FilingTrahvihoiatusmäärus: majandusaasta aruanne esitamata— Ä 10004599 / M1 · Olek: Puudused kõrvaldatud

Connected companies

Same-person ties · e-Business Register

osaühing Serioso is connected to 2 other companies through 1 person who hold a role here and elsewhere. The strongest tie runs through Marina Kaas (2 companies).

Total connections
2
via 1 person
Connecting people
1
Active here
Distinct roles
4
Board member · Founder
Strongest tie
Marina
2 companies
Via personMarina Kaas
20247692 €−29 147 €70k €74k €028.06.2025
202319 754 €−1568 €124k €125k €001.08.2024
202238 700 €32 465 €132k €132k €007.07.2023
20219800 €2419 €107k €108k €008.07.2022
20209200 €5539 €109k €110k €023.11.2021
20198992 €520 €107k €108k €029.10.2020
Original files in PDF – the full register on e-Business Register.View reports on e-Business Register
–
Quarterly breakdown
YearQ1Q2Q3Q4
Revenue 2025––––
State taxes 20254k €–––
Taxes on workforce 20250 €–––
Employees 2025––––
Revenue 2024––––
State taxes 2024–––2k €
Taxes on workforce 2024–––420 €
Employees 2024––––
Revenue 2023––––
State taxes 20231 €–1k €–
Taxes on workforce 20230 €–373 €–
Employees 2023––––
Revenue 2022––––
State taxes 2022931 €––966 €
Taxes on workforce 2022280 €––140 €
Employees 2022––––
2
MK
Marina Kaas
board member, founder, shareholder 100%, ultimate beneficial owner
2 other companies›
CompanyRoleReg. code
MANNET PARTNERS BALTICS Osaühing
Board memberShareholder 10%Ultimate beneficial owner
10459225
Vahva Maius OÜ
Board memberFounderUltimate beneficial ownerShareholder 40%
12398500