Company lists · Data refreshed September 2026

Top 20 Consultancy services based in Leiden, Netherlands

Name: Consultancy services based in Leiden, Netherlands
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 62 companies tracked

RevenueBase identified 62 company matches for consultancy services associated with Leiden, Netherlands as of September 2026 and tracks 149 professional contacts across them, including 47 with verified work emails. Across the Netherlands, Amsterdam is the largest hub for this category (905 companies); Leiden has 62.

This list covers company matches for consultancy services associated with Leiden, Netherlands, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 24, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 24, 2026 How this list was built

62Companies

149Contacts tracked

47Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 20 largest consultancy services based in Leiden, Netherlands

Ranked by team size

Top 20 of 62 company matches for consultancy services based in Leiden, Netherlands, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 24, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Unipartners Leiden	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	11-50	20 contacts →
	Exact match “UniPartners Leiden is een academisch adviesbureau opgericht in 2016 en gevestigd dichtbij het centrum van Leiden.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
2	Winston & Partners	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	11-50	18 contacts →
	Exact match “Het beste uit mensen halen, zodat zij zich kunnen ontplooien en presteren en daardoor een grotere bijdrage kunnen leveren aan de organisatie waar zij werken.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
3	Milieu Adviesbureau Adverbo	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	8 contacts →
	Exact match “Milieu Adviesbureau Adverbo B.V.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
4	Blaauwberg	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	8 contacts →
	Exact match “Wij zijn Blaauwberg, het enige sociologische adviesbureau in Nederland.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
5	J-Link	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	7 contacts →
	Exact match “J-Link offers custom management consulting services in order to overcome cultural differences between Japanese and European business partners.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
6	Mproof	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	11-50	6 contacts →
	Exact match “Mproof begeleidt organisaties op ieder niveau en op alle gebieden met het zetten van de volgende stap richting succesvolle dienstverlening.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
7	Buro Z Online Marketing	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	3 contacts →
	Exact match “Het buro om je verder te helpen met je website.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
8	Stratelligence	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	2 contacts →
	Exact match “Stratelligence pursues research-based consultancy for public and private clients.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
9	Ursa Major Projects B.V	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	2 contacts →
	Exact match “We strive to make your Project a success and contribute as an integral part of the Project Team.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
10	Escimco	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	2 contacts →
	Exact match “ESCIMCO BV supports your business in delivering more value to you, your customers and your stakeholders in a pragmatic way.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
11	Arena Corporate Finance	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “Arena Finance is een succesvol onafhankelijk bedrijfskundig adviesbureau op het terrein van fusies & overnames, alsmede financiering- en recoveryvraagstukken voor Duin- en…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
12	Connect Flow International BV	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “We are your local partner.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
13	Online Tigers	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “Gedreven onderneemster zoekt managers & eigenaren met hart voor de zaak die online willen groeien.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
14	Winworx	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “Winworx was founded in 2017.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
15	VIA Katz	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “Als adviseur en als leidinggevende kijk ik naar de werkelijke vraag die er leeft om iets toe te voegen voor een organisatie.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
16	Remarcx	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “Consultancy and Project management for general Process improvements & Process control Project and production floor assistance Worldwide, on-site and remote.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
17	Eqnon Consulting	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “Eqnon is a boutique consulting firm providing management consulting, business analysis and investment management services in the renewable energy sector.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
18	Manage4u BV	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “Manage4U provides services and consultancy around two subjects: Alarm Management, including HMI design and operator workload Business Development and Marketing services for…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
19	Wesseldijk & Company	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “Wesseldijk & Company is a boardroom consultancy firm.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
20	Blubox BV	Exact match	Leiden, NetherlandsHQ recorded Sep 24, 2026	1-10	1 contacts →
	Exact match “We specialise in consultancy and interim management solutions concentrating on change management and program management to effectively deliver strategic business transformation…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “consultancy services”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 20 of 62 consultancy services based in Leiden, Netherlands

See the full list, filter by size, metro and specialty, and access 47 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Consultancy services based in Leiden, Netherlands at a glance

As of Sep 24, 2026

31.5%Verified-email coverage

2.4Average contacts per company

1-10Median size (employees)

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

11-50

Email recency for this list is measured across the whole Netherlands list rather than for Leiden, so it is reported there. Company counts and contact totals on this page are exact for Leiden, over 62 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Leiden, Netherlands whose business descriptions match “consultancy services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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: Every displayed company carries at least one verified work email. RevenueBase tracks 47 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 24, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Consultancy services by metro in the Netherlands

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “consultancy services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many consultancy services are there based in Leiden, Netherlands?

RevenueBase identified 62 company matches for consultancy services associated with Leiden, Netherlands as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Unipartners Leiden tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the Netherlands has the most consultancy services?

Amsterdam leads the Netherlands with 905 company records, followed by Rotterdam (432) and Utrecht (302). Leiden has 62.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 47 professional contacts with verified work emails tracked across these 62 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 24, 2026.

Ready to reach these companies? Verified emails and direct dials for all 62 consultancy services based in Leiden, Netherlands. Start with a free account, no credit card.

Download this list →

Related lists

Consultancy services by geography

Browse the directory

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.