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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding contractorHerisauSlongo AG
Slongo AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Slongo AG carries out building, civil engineering and road construction work. Its activities include residential, industrial and commercial construction, sewer and utility lines, road surfacing, water engineering, demolition and material processing.

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Presence

Service area

Offering

Products & services

Industry:Building contractorCivil worksDemolition
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3.6/5

Slongo AG

✓ Offered5
Building construction
Residential, industrial and commercial building construction for new builds and other structural projects.
Civil engineering
Sewer systems, utility lines and excavation work in civil engineering.
Road construction
Asphalt, natural stone and concrete surfacing for roads and traffic areas.
Hydraulic engineering
Flood protection and watercourses in hydraulic engineering.
Demolition and deconstruction
Demolition and processing of buildings and construction materials.
Trust & reputation

ranQ Trust Score of Slongo AG: 3.6 out of 5.0

Trust Score3.6/ 5.0

Solid

x

Data basis 58% · As of November 2026

Slongo AG 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%
Slongo AG scores 46.4 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.0.012%
  • 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%
Slongo AG 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%
Slongo AG scores 33.6 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 35.57.14%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.10.04%
Qualifications+0.00

Slongo AG reaches a ranQ Trust Score of 3.6 out of 5.0 — rated «Solid». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 58%, so the score is backed by part of the criteria. As of November 2026.

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

Press

Media

October 30, 2020Media
Nach 88 Jahren: Die Alder Bau AG aus Herisau wird von der Firma Slongo AG übernommen
appenzellerzeitung.ch

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Location

Lindenwis 6
9100 Herisau

At a glance

Legal form
Corporation
UID
CHE-289.474.636
Founded
2026 · 0 years
Last commercial register change
August 10, 2026
Employees
11 to 20

Active in 7 of 26 cantons

  • Eastern Switzerland
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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