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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryAssociations & Interest GroupsNGOs & NPOsZurichDr. Stephan à Porta - Stiftung
Dr. Stephan à Porta - Stiftung Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Dr. Stephan à Porta - Stiftung manages its own property portfolio and rents housing at favourable conditions to generate funds for its grant-making. The foundation uses these funds to support charitable and non-profit organisations while combining donor activity with operational property management.

AI-generated
Offering

Products & services

Industry:NGOs & NPOs
✓ Offered3
Funding for non-profit and charitable institutions
Grants to non-profit and charitable institutions in the City of Zurich and the canton of Graubünden; contributions via funding projects, partnerships and grant applications.
Rental of affordable housing
Rental of the foundation's own properties on favourable terms; provision of affordable apartments in the city of Zurich as a means to finance the foundation's purpose.
Property management
Management of the foundation's own properties in Zurich, including properties in several city districts and information on construction projects.
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4.2/5

Dr. Stephan à Porta - Stiftung

Trust & reputation

ranQ Trust Score of Dr. Stephan à Porta - Stiftung: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 100% · As of October 2026

Dr. Stephan à Porta - Stiftung scores 65.9 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.61.924%
  • 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.72.110%
  • 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.70.08%
Dr. Stephan à Porta - Stiftung scores 84.9 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%
Dr. Stephan à Porta - Stiftung scores 86.7 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).86.722%
Dr. Stephan à Porta - Stiftung scores 65.2 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 35.77.14%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.53.34%
Qualifications+0.00

Dr. Stephan à Porta - Stiftung reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.2 out of 5 stars from 16 customer reviews. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.2
of 5

Aggregated from 16 reviews across all connected sources

Sources
GGoogle4.216
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

June 2, 2026Media
Günstiger Wohnraum finanziert guten Zweck
hochparterre.ch
June 26, 2025Media
Zürich: Dolder-Besitzer verkauft Häuser bei Bahnhofstrasse
nau.ch
June 25, 2025Media
«Dolder»-Besitzer Schwarzenbach verkauft historische Häuser bei der Bahnhofstrasse
nzz.ch
June 5, 2024Media
«Im Engadin steigen wir nicht ein»
engadinerpost.ch
November 22, 2022Media
Neubau bietet dem Lighthouse mehr Platz | Zürich West
zuerich24.ch
July 17, 2018Media
Zürich verliert rund 300 Billigwohnungen
tagesanzeiger.ch

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Location

Kreuzstrasse 31
8008 Zurich
Opening hours
Mon
09:00 - 12:00, 14:00 - 16:00
Tue
09:00 - 12:00, 14:00 - 16:00
Wed
09:00 - 12:00, 14:00 - 16:00
Thu
09:00 - 12:00, 14:00 - 16:00
Fri
09:00 - 12:00, 14:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Foundation
UID
CHE-105.949.231
Founded
1945 · 81 years
Last commercial register change
April 8, 2026
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.97.06%
  • 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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