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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,544 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesSecurity ServicesCorsier GeGreystone Security SA
Greystone Security SA Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Greystone Security SA is a full-service security company offering comprehensive, proactive and discreet security solutions. Its services include security officers (armed/unarmed, including K9), close protection, secured transportation, security consulting and training, investigations, counter-surveillance, TSCM, information security and technical security systems.

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Offering

Products & services

Industry:Security Services
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Greystone Security SA

✓ Offered11
Security Officers
Security officers in uniform or formal attire, armed or unarmed, including specialized K9 security services for protection of clients and assets.
Close Protection
Close protection specialists for armed and unarmed assignments in Switzerland and worldwide, including counter-surveillance, emergency medicine, defensive tactics and protective driving.
Secured Transportation
Secured transportation of clients and valuables, airport transfers, multi-location itineraries, armored vehicles, protective driving and evasive maneuvers.
Security Consulting
Security consulting for threat, risk and vulnerability assessments, penetration tests, and customized security plans and frameworks.
Security Training
Customized security training for executives, teams, household staff and private individuals in security awareness, travel safety, surveillance detection, defensive tactics and protective driving.
Security Intelligence
Security intelligence services with data gathering, analysis and interpretation to anticipate threats and provide strategic recommendations.
Investigations
Investigations for background checks and due diligence to assess risks related to partnerships, investments and hires.
Counter Surveillance
Counter-surveillance services to detect suspicious activity and surveillance efforts, using technology and field expertise to protect privacy and safety.
Technical Surveillance Countermeasures (TSCM)
Technical surveillance countermeasures to detect hidden microphones, cameras and GPS trackers through electronic sweeps, physical inspections and RF analysis.
Information Security
Information security services to protect against cyber threats, data breaches and unauthorized access through risk assessments, legal solutions, physical security, network security and encryption.
Technical solutions
Technical security solutions including high-definition surveillance cameras, alarm systems, remote monitoring, motion detection and mobile integration.
Trust & reputation

ranQ Trust Score of Greystone Security SA: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 54% · As of October 2026

Greystone Security SA 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.
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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%
Greystone Security SA scores 64.1 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.50.012%
  • 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%
Greystone Security SA scores 83.3 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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).83.322%
Greystone Security SA scores 8.6 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 35.8.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Greystone Security SA reaches a ranQ Trust Score of 3.9 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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Secure profile

Location

Route de Corsier 8
1246 Corsier Ge

At a glance

Legal form
Corporation
UID
CHE-463.186.384
Founded
2023 · 3 years
Last commercial register change
October 16, 2025
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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