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

About the company

The core activity of winstr AG is the provision of tax consulting and trust services for international and Swiss clients, in particular companies and entrepreneurs.

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Products & services

Industry:Fiduciary Offices
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winstr AG

10
Tax advisory and tax planning
Tax advisory and tax planning for domestic and foreign individuals and companies in national and cross-border situations; including all types of taxes and their impact on social security and civil law.
Tax returns and tax assessments
Preparation of tax returns for individuals and legal entities, including withholding tax, stamp duty, value added tax, inheritance and gift tax declarations.
Tax-optimized restructurings and structuring
Tax-neutral and tax-efficient restructurings, structuring of investments and business activities, advice on legal form, acquisitions and start-ups.
Tax rulings and tax representation
Preparation, negotiation and obtaining of tax rulings as a core activity of the tax consultancy; support in tax-related matters for clients.
Fiduciary services / financial and fiduciary bookkeeping
Keeping financial accounts, preparation of annual and interim financial statements, year-end consultations, consolidations and evaluations for domestic and foreign clients.
Payroll accounting and personnel administration
Payroll accounting including annual and salary statements, plus advice and handling of social security matters, labour law and work permits.
Budget and financial planning
Drawing up budgets and financial plans, liquidity planning, and support for year-end closing preparations.
Company foundations, conversions and liquidations
Implementation and support of company foundations, conversions, reorganisations and liquidations, including related corporate housekeeping.
Succession planning and estate settlement
Succession planning and succession arrangements, plus classic family office services in the tax area and execution of wills.
Board of Directors mandates and general administration
Board of Directors mandates, factoring and debt collection, general administration, and corporate housekeeping for companies.
Trust & reputation

ranQ Trust Score of winstr AG: 3.8 out of 5.0

Trust Score3.8/ 5.0

High

x

Data basis 96% · As of October 2026

winstr AG scores 58.4 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.58.124%
  • 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.35.310%
  • 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.88.08%
winstr AG scores 74.8 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.55.07%
winstr 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%
winstr AG scores 0.0 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 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

winstr AG reaches a ranQ Trust Score of 3.8 out of 5.0 — rated «High». The rating draws, among other things, on 3.7 out of 5 stars from 3 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
3.7
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle3.73
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Limmatquai 120
8001 Zurich
Opening hours
Mon
08:30 - 12:00, 14:00 - 18:00
Tue
08:30 - 12:00, 14:00 - 18:00
Wed
08:30 - 12:00, 14:00 - 18:00
Thu
08:30 - 12:00, 14:00 - 18:00
Fri
08:30 - 12:00, 14:00 - 18:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-470.833.929
Founded
2019 · 7 years
Last commercial register change
September 13, 2022
Employees
1 to 10
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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