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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryFinance & InsuranceFinancial ServicesLandquartKey Investment, Brien Donnellon
Key Investment, Brien Donnellon Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Key Investment is the provision of financial services, particularly in the areas of financial planning and tax consulting, personnel management and payroll accounting for foreign employees, as well as real estate consulting and financing. The company primarily supports foreign specialists and HR departments in Switzerland in utilizing the Swiss financial system.

AI-generated
Offering

Products & services

Industry:Financial Services
✓ Offered9
Tax advisory for individuals
Tax return, estimation of the tax burden, review of tax assessments and tax bills, extensions of deadlines, and support with objections.
Human Resource Support
Payroll administration, payroll, tax at source, management of employee benefits and insurance, support with office policies, reports, and general administration.
Real estate and mortgage advisory
Advisory and brokerage for buying, selling, or renting real estate, mortgage negotiations, valuations, project review, and annual property management.
Accounting & Payroll
Outsourcing for accounting and payroll administration with reliable and efficient processing.
Company Formation
Support with the formation of a company and the associated key decisions and challenges.
Investment
Objective investment advice and investment solutions.
Pensions & Insurance
Pension planning and insurance consulting.
Residence Permits
Support with the application for residence permits in Switzerland.
Retirement & Estate Planning
Pension planning and estate planning, including drafting a will.
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4.1/5

Key Investment, Brien Donnellon

Trust & reputation

ranQ Trust Score of Key Investment, Brien Donnellon: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Key Investment, Brien Donnellon has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Key Investment, Brien Donnellon scores 78.5 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.55.07%
Key Investment, Brien Donnellon 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%
Key Investment, Brien Donnellon scores 17.1 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 35.17.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Key Investment, Brien Donnellon reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, 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.

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Location

Bahnhofstrasse 54
7302 Landquart
Opening hours
Mon
08:00 - 17:00
Tue
08:00 - 17:00
Wed
08:00 - 17:00
Thu
08:00 - 17:00
Fri
08:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Sole proprietorship
UID
CHE-108.708.089
Founded
1997 · 29 years
Last commercial register change
January 23, 2020
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.67.06%
  • 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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