Company lists · Data verified August 2026

Top 25 Ecological consulting firms based in Switzerland

Name: Ecological consulting firms based in Switzerland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 161 companies tracked

There are 161 ecological consulting firms headquartered in Switzerland (RevenueBase, August 2026). RevenueBase tracks 1,642 professional contacts across them, including 717 with verified work emails and 62 with mobile numbers. Zurich is the largest hub.

This list covers ecological consulting firms headquartered in Switzerland, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

161Companies

1,642Contacts tracked

717Verified emails

62Mobile numbers

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The 25 largest ecological consulting firms based in Switzerland

Ranked by team size

Top 25 of 161 ecological consulting firms based in Switzerland, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Quantis	Lausanne	201-500	332	187
2	Holinger	Liestal Basel	501-1,000	264	150
3	Jauslin Stebler AG	Zurich	51-200	108	8
4	Infras	Bern	51-200	61	35
5	Econetta	Schlieren	51-200	56	34
6	Ecosens AG	Wallisellen	51-200	41	31
7	Ecotec Environnement SA	Geneve	11-50	33	17
8	HSE Conseils SA	Gland	11-50	31	23
9	Planikum AG	Zurich	11-50	23	18
10	Sieber Cassina Partner AG	Winterthur	11-50	23	17
11	Carbotech AG	n/a	11-50	21	5
12	Ingenias AG	St. Gallen	11-50	18	8
13	BSS Volkswirtschaftliche Beratung	Basel	11-50	17	8
14	Adolf Krebs AG	Grund Bei Gstaad	51-200	16	6
15	ILU AG	Horw	11-50	14	11
16	Agrexis AG	Basel	11-50	14	8
17	Drosera Ecologie Appliquée SA	Sion	11-50	14	8
18	RSK Dach-Region	Olten	201-500	14	6
19	Ipso ECO AG	Rothenburg	11-50	12	9
20	Bureau D'études Impact SA	Martigny	11-50	12	7
21	EK Energiekonzepte AG	Zurich	11-50	11	8
22	Ecoscan SA	Chavannes	11-50	11	2
23	Dionea SA	Lugano	11-50	11	1
24	Hintermann & Weber AG	Reinach	11-50	11	1
25	Toumi AG	Biel	1-10	11	1

Showing 25 of 161 ecological consulting firms based in Switzerland

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Ecological consulting firms based in Switzerland at a glance

As of Aug 28, 2026

1-10Median size (employees)

ZurichLargest hub · 10 HQs

62Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

112

11-50

51-200

201-500

501-1,000

Ecological consulting firms by metro

Metro	Companies
Ecological consulting firms in Zurich	10
Ecological consulting firms in Bern	9
Ecological consulting firms in Basel	7
Ecological consulting firms in Lausanne	5
Ecological consulting firms in Geneve	5
Ecological consulting firms in Winterthur	4
Ecological consulting firms in Geneva	3
Ecological consulting firms in Fribourg	3

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “ecological consulting firms”, with match quality audited by blind human judging, and headquartered in Switzerland.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many ecological consulting firms are there based in Switzerland?

There are 161 ecological consulting firms headquartered in Switzerland as of August 2026 (RevenueBase).

What is the largest company on this list?

Quantis, headquartered in Lausanne, tops this list with the largest team on record.

Which city has the most ecological consulting firms?

Zurich leads with 10 headquartered companies, followed by Bern (9) and Basel (7).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 717 verified decision-maker contacts tracked across these 161 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph, the same data that powers RevenueBase's B2B data products and the free research portal.