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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryFinance & InsuranceFiduciary OfficesWinterthurWinco Treuhand AG
Winco Treuhand AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Winco Treuhand AG provides fiduciary, business consulting and audit services for small and medium-sized enterprises and private clients. Its services include accounting and payroll, VAT and tax filings, corporate transactions (formations, conversions, liquidations), audit engagements, and hosted IT solutions such as AbaWeb and DeepBox for bookkeeping and secure file exchange.

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Offering

Products & services

Industry:Fiduciary Offices
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Winco Treuhand AG

✓ Offered7
Fiduciary services
Tailor-made fiduciary services for small and medium-sized businesses and private individuals, with personal and holistic advice.
Business consulting
Business consulting for company set-ups, restructurings, mergers, liquidations, purchase and sale of companies, registered office services, valuations, succession planning and executor of will mandates.
Financial and accounting services
Management of financial, accounts receivable and accounts payable accounting, closing-of-accounts advisory, VAT returns, financial and liquidity planning as well as on-site support.
Taxes
Preparing tax returns for natural and legal persons, representation before tax authorities, objections and tax planning and optimisation.
Auditing
Limited reviews according to the CO, foundation and association audits, audits of asset transfers, restructurings and mergers as well as special audits.
AbaWeb
Abacus internet solution for accounting with online access, financial accounting, financial packages, accounts receivable and accounts payable software, and electronic banking.
DeepBox
Secure document exchange platform with encrypted online communication, file upload and download, and data protection-compliant document exchange.
Trust & reputation

ranQ Trust Score of Winco Treuhand AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Winco Treuhand AG scores 70.8 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.73.324%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.45.610%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.95.08%
Winco Treuhand AG scores 78.6 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.75.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.70.07%
Winco Treuhand AG scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
Winco Treuhand AG scores 31.4 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.31.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Winco Treuhand AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.8 out of 5 stars from 5 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.8
of 5

Aggregated from 5 reviews across all connected sources

Sources
GGoogle4.85
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Location

Neuwiesenstrasse 37
8400 Winterthur

At a glance

Legal form
Corporation
UID
CHE-354.886.915
Founded
2019 · 7 years
Last commercial register change
October 1, 2025
Employees
11 to 20
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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