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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryFinance & InsuranceFiduciary OfficesBaselATAG Private & Corporate Services AG
ATAG Private & Corporate Services AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

ATAG Private & Corporate Services AG is a family office providing comprehensive administration and advisory services for high-net-worth families and family-owned businesses. Services listed on the website include legal advisory (corporate, tax, family and inheritance law), tax planning, corporate services and administration, trust and foundation setup and management, family governance, philanthropy advice, and specialised art, maritime and aviation consulting.

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Products & services

Industry:Fiduciary Offices
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4.1/5

ATAG Private & Corporate Services AG

12
Legal advice
Business law, tax law as well as family and inheritance law; strategic legal advice, legal planning, transaction support, representation in disputes, escrow services.
Tax advisory
Tax planning and advice for holding structures, wills, seat relocations and acquisitions; national and international tax solutions, with support in implementation.
Business Administration
Bookkeeping, reporting and fiduciary processing of complex transactions; support with holding structures, international trusts and the management of a family office.
Corporate Service & Administration
Representation as board members of companies and foundations, leadership of international holding structures, implementation of strategy and instructions in companies, foundations and administrations.
Trusts and Foundations
Advisory, establishment and long-term administration of trusts and foundations; estate planning, business administration and professional support for these structures.
Family Governance
Design and implementation of intrafamily agreements, rules for leadership and control, strengthening family cohesion and integration into the family business.
Family Counselling
Advisory for families in times of change, joint projects, new life phases, education and relocation of residence; support for major decisions.
Asset Allocation
Independent strategic financial matters to secure the family and achieve financial goals; broader in scope than classic wealth advisory.
Philanthropy
Advice and representation for private commitments and alignment with CSR strategies; topics relating to impact, perception as well as press and public.
Art advisory
Advice on art collections and art-related decisions; incorporation of preferences and investment strategy by specialized professionals.
Maritime Consulting
Purchase and sale, construction and refit as well as ownership and charter of yachts; including taxes, customs, financing, registration, maintenance and operation.
Aviation Consulting
Advisory on the acquisition and sale of jets as well as on operation, regulations and requirements related to flight operations.
Trust & reputation

ranQ Trust Score of ATAG Private & Corporate Services AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

ATAG Private & Corporate Services AG scores 62.0 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.70.824%
  • 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.27.910%
  • 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.78.08%
ATAG Private & Corporate Services AG scores 89.3 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.100.012%
  • 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%
ATAG Private & Corporate Services 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%
ATAG Private & Corporate Services AG scores 7.4 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 35.7.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

ATAG Private & Corporate Services AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 2 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
5
of 5

Aggregated from 2 reviews across all connected sources

Sources
GGoogle52
★TrustpilotSoon
PProvenExpertSoon

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

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Location

St. Jakobs-Strasse 17
4052 Basel
Opening hours
Mon
08:00 - 12:00, 13:30 - 18:00
Tue
08:00 - 12:00, 13:30 - 18:00
Wed
08:00 - 12:00, 13:30 - 18:00
Thu
08:00 - 12:00, 13:30 - 18:00
Fri
08:00 - 12:00, 13:30 - 18:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-103.071.787
Founded
1978 · 48 years
Last commercial register change
October 2, 2026
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.100.06%
  • 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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