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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesResearch instituteLandquartKLARK AG
KLARK AG Logo
Verified· 4 sourcesOwner confirmed
Last updatedAugust 20, 2026

Contact

Summary

About the company

Die Gesellschaft bezweckt die Herstellung, den Handel, Dienstleistungen und die Logistik von Baustoffen jeder Art, insbesondere von ökologischen Baustoffen und CO2-Senkeleistungen in der Schweiz oder im Ausland. Sie kann ferner ein Lizenzsystem aufbauen, entwickeln und führen und alle damit verbundenen Tätigkeiten wahrnehmen. Sie kann Niederlassungen und Tochtergesellschaften errichten, sich an anderen Gesellschaften beteiligen und für die Tätigkeiten notwendige Vermögenswerte besitzen. Die Gesellschaft kann alle weiteren Geschäfte tätigen und Massnahmen ergreifen, die den Zweck der Gesellschaft fördern oder mit diesem direkt oder indirekt zusammenhängen.

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Trust Score4.1/5

KLARK AG

Service area

Offering

Products & services

Industry:Research instituteSpecialist foundation engineeringNature conservation organizationBuilding materials manufacturerDIY storeBuilding materials dealer
✓ Offered1
KLARK
KLARK is a CO₂-storing concrete. CO₂ is permanently bound in the building material via certified biochar (biogenic carbon). Thus buildings and components become CO₂ sinks. The storage performance is effective immediately and externally verified. KLARK is the only building material with a net-zero balance that also separately shows the CO₂ storage performance. The CO₂ emissions generated during production are offset, and the permanently stored biogenic carbon is also transparently and measurably disclosed. Variants (offsetting the production-related CO₂ emissions, A1-A3): KLARK 100%: full offset, net-zero balance KLARK 75%: offset of 75% KLARK 50%: offset of 50% Technology: comparable properties to conventional concrete (base C30/37), also usable as a partial application (e.g., base slab, stairwell). Model: distribution via a licensing system, licensees (concrete manufacturers) produce and deliver KLARK.
auf Anfrage
Expertise

Expert

AS
Andreas Schefer
Managing Director

Andreas Schefer is the managing director of KLARK AG, the Swiss company for CO₂-storing concrete. He has accompanied KLARK since its beginnings and drives the nationwide establishment of this Graubünden climate innovation.

Trust & reputation

ranQ Trust Score of KLARK AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 58% · As of November 2026

KLARK 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%
KLARK AG scores 53.4 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.25.012%
  • 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%
KLARK AG scores 98.3 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).98.322%
KLARK AG scores 69.1 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 35.91.44%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.46.74%
Qualifications+0.05

KLARK AG 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 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.

Common questions

Answers

What is KLARK?
KLARK is a CO₂-storing concrete from Switzerland that permanently binds CO₂ in the building material with the help of certified biochar, turning buildings into long-term CO₂ sinks.
How does KLARK's CO₂-neutral concrete work?
KLARK mixes biogenic carbon from biochar into the concrete. This remains permanently bound even after multiple recycling cycles and offsets the production-related CO₂ emissions, up to a net-zero balance.
Is KLARK's CO2 impact proven?
Yes. KLARK's environmental balance sheet is prepared according to KBOB rules, externally verified, and listed in the official KBOB register. The sink performance is measurable and certified. The CO2 storage capacity is shown with a CO2 certificate.
How much CO₂ does KLARK concrete store?
KLARK stores up to around 250 kg CO₂ per cubic meter of concrete, depending on the variety, permanently bound in the structure, with technically equivalent properties to conventional concrete.
Where can I buy KLARK concrete?
KLARK is distributed through a Swiss licensed network. Regional concrete manufacturers produce with regional resources and deliver KLARK directly to the construction site, also for partial applications.
Press

Media

July 24, 2026Media
Eines der grössten Referenzobjekte für CO2 -speichernden Beton
schweizer-bauwirtschaft.ch
May 22, 2026Media
Klimastiftung Schweiz fördert neu acht KMU
punkt4.info
January 1, 2026Media
KLARK AG Nomination ZKB Pionierpreis Technopark 2026
zindel-united.swiss
January 1, 2026Media
Die KLARK AG erweitert laufend die Verfügbarkeit durch zusätzliche Lizenznehmer
klark.swiss
January 1, 2026Media
Ersatzneubau in Zürich mit KLARK.
betonsuisse.ch
December 10, 2025Media
Die Branche steht am Anfang eines Wandels
schweizer-bauwirtschaft.ch
November 20, 2025Media
Wie Gebäude & Infrastrukturen zur dauerhaften CO₂-Senke werden
ieu.ch
September 12, 2025Media
Diese Energiezentrale neutralisiert schon beim Bau Emissionen
blick.ch
September 2, 2025Media
KLARK AG gegründet: Beton wird zum CO₂-Speicher
leaderdigital.ch
January 9, 2025Media
Pilotprojekte zu nachhaltigem Beton reichen nicht – die breite Anwendung zählt
sia.ch
January 1, 2025Media
«Die Idee»: CO₂-neutraler Beton SRF 10 vor 10
srf.ch
January 1, 2025Media
Neuer Meilenstein für KLARK – mit einer Klimabilanz, die sogar negativ ist
klark.swiss
Media
Schweizer Technologie: Auf dem Weg zum CO2-negativen Beton
nau.ch
Credentials

Certifications & memberships

KBOB/ecobau Ökobilanz
KLARKs Netto-Null-Bilanz ist über die KBOB-Liste, den Schweizer Ökobilanz-Standard im Bau, anerkannt
January 1, 2024
Knowledge

Articles about KLARK AG

No articles have been published yet.

Comparisons

KLARK AG in comparison

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Contact

Location

Sägenstrasse 8
7302 Landquart
Opening hours
Mon
07:30 - 17:00
Tue
07:30 - 17:00
Wed
07:30 - 17:00
Thu
07:30 - 17:00
Fri
07:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-314.037.382
Founded
2025 · 1 year
Last commercial register change
September 10, 2026
Employees
1 to 10

Active throughout 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