Company lists · Data refreshed September 2026

Top 25 Advisory and outsourcing services based in Greece

Name: Advisory and outsourcing services based in Greece
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 781 companies tracked

RevenueBase identified 781 advisory and outsourcing services headquartered in Greece as of September 2026 and tracks 9,198 professional contacts across them, including 2,845 with verified work emails and 165 with mobile numbers. Athens is the largest hub.

This list covers advisory and outsourcing services headquartered in Greece, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 23, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 23, 2026 86% judged on-target in blind review

781Companies

9,198Contacts tracked

2,845Verified emails

165Mobile numbers

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

The 25 largest advisory and outsourcing services based in Greece

Ranked by team size

Top 25 of 781 advisory and outsourcing services based in Greece, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to advisory and outsourcing services: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Grant Thornton Greece	Partial evidence	Athens, GreeceHQ checked Sep 23, 2026	1,001-5,000	1,313 contacts →
	Partial evidence “Grant Thornton SA provides personalised assurance, tax and advisory services to listed entities, privately-held businesses and public sector businesses.” Source: RevenueBase Database · checked Sep 23, 2026
2	Accenture Greece	Indirect evidence	Kifisia, GreeceHQ checked Sep 23, 2026	1,001-5,000	1,171 contacts →
	Indirect evidence “Η Accenture είναι ηγέτιδα εταιρεία παροχής συμβουλευτικών υπηρεσιών σε παγκόσμιο επίπεδο, δημιουργώντας απτή αξία με ταχύτητα και σε μεγάλη κλίμακα.” Source: RevenueBase Database · checked Sep 23, 2026
3	Kpmg Greece	Partial evidence	Athens, GreeceHQ checked Sep 23, 2026	501-1,000	755 contacts →
	Partial evidence “Operating in Greece for more than 50 years KPMG offers through 4 entities, audit, tax, accounting & payroll, legal and advisory services to domestic and international businesses…” Source: RevenueBase Database · checked Sep 23, 2026
4	Mellon Technologies	Indirect evidence	Piraeus, GreeceHQ checked Sep 23, 2026	1,001-5,000	340 contacts →
	Indirect evidence “Mellon Technologies, the parent company of Mellon Group of Companies, was founded in 1994 in Athens, Greece.” Source: RevenueBase Database · checked Sep 23, 2026
5	Real Consulting	Indirect evidence	Chalandri, GreeceHQ checked Sep 23, 2026	501-1,000	285 contacts →
	Indirect evidence “Real Consulting, is one of the leading consulting and implementation of integrated IT projects companies in Greece.” Source: RevenueBase Database · checked Sep 23, 2026
6	Sportion	Indirect evidence	Athens, GreeceHQ checked Sep 23, 2026	51-200	119 contacts →
	Indirect evidence “Sportion is a promising and rapid developing company operating in multiple markets and regions.” Source: RevenueBase Database · checked Sep 23, 2026
7	Fovera Prostasia S.A	Indirect evidence	Athens, GreeceHQ checked Sep 23, 2026	51-200	116 contacts →
	Indirect evidence “Accounting - Taxation - Business Consulting OUR COMPANY Following many years of activity, Fovera Prostasia S.A.” Source: RevenueBase Database · checked Sep 23, 2026
8	Priority	Indirect evidence	Lykovrissi, GreeceHQ checked Sep 23, 2026	51-200	113 contacts →
	Indirect evidence “Founded in 1995, PRIORITY SA has become a leading consulting firm in Greece, specializing in Management, IT and Training.” Source: RevenueBase Database · checked Sep 23, 2026
9	Meccanica	Indirect evidence	Thessaloniki, GreeceHQ checked Sep 23, 2026	1,001-5,000	88 contacts →
	Indirect evidence “Η MECCANICA, ως post-tech εταιρεία-ηγέτης στην Ελλάδα, προσφέρει ολοκληρωμένες λύσεις για δημόσιους και ιδιωτικούς φορείς, μέσα από μία συνδυαστική προσέγγιση μελέτης, σχεδιασμού…” Source: RevenueBase Database · checked Sep 23, 2026
10	Innovation Technology And Management Consultants	Indirect evidence	Marousi, GreeceHQ checked Sep 23, 2026	n/a	81 contacts →
	Indirect evidence “ITMC S.A.” Source: RevenueBase Database · checked Sep 23, 2026
11	Syntax IT Group	Indirect evidence	Athens, GreeceHQ checked Sep 23, 2026	51-200	79 contacts →
	Indirect evidence “SYNTAX is a software, consulting, onsite & outsource IT services pioneer, operating from its Athens headquarters in Greece & EU, and in the Arabian Gulf from its affiliates SYNTAX…” Source: RevenueBase Database · checked Sep 23, 2026
12	ASD Account Financial Advisor SA	Indirect evidence	Peristéra, GreeceHQ checked Sep 23, 2026	201-500	69 contacts →
	Indirect evidence “Our company began as an accounting office established in 1991.” Source: RevenueBase Database · checked Sep 23, 2026
13	Noisis Development Consultant S.A	Indirect evidence	Athens, GreeceHQ checked Sep 23, 2026	51-200	65 contacts →
	Indirect evidence “NOISIS S.A.” Source: RevenueBase Database · checked Sep 23, 2026
14	Orthologismos SA	Indirect evidence	Thessaloniki, GreeceHQ checked Sep 23, 2026	51-200	61 contacts →
	Indirect evidence “Orthologismos S.A.” Source: RevenueBase Database · checked Sep 23, 2026
15	Baker Tilly Greece	Partial evidence	Athens, GreeceHQ checked Sep 23, 2026	501-1,000	58 contacts →
	Partial evidence “Baker Tilly South East Europe is a leading provider of accounting, audit, tax, and advisory services in the region, and a proud member of Baker Tilly International – a global top…” Source: RevenueBase Database · checked Sep 23, 2026
16	Professional Services Solutions	Indirect evidence	Glyfada, GreeceHQ checked Sep 23, 2026	51-200	54 contacts →
	Indirect evidence “Our tailored business solutions enable employers to leverage our professional expertise to gain sufficient time and resources to focus on their core business activities.” Source: RevenueBase Database · checked Sep 23, 2026
17	Logismos S.A	Indirect evidence	Salonica, GreeceHQ checked Sep 23, 2026	11-50	44 contacts →
	Indirect evidence “Business development” Source: RevenueBase Database · checked Sep 23, 2026
18	KSI Greece	Partial evidence	Marousi, GreeceHQ checked Sep 23, 2026	11-50	42 contacts →
	Partial evidence “KSi Greece is a dynamic firm which provides a wide range of integrated assurance and advisory services at world-wide level that can ensure efficiency, stability and growth for…” Source: RevenueBase Database · checked Sep 23, 2026
19	Braincube SA	Indirect evidence	Athens, GreeceHQ checked Sep 23, 2026	11-50	40 contacts →
	Indirect evidence “BrainCube is a provider of consulting services and integrated software solutions.” Source: RevenueBase Database · checked Sep 23, 2026
20	Optimal	Indirect evidence	Athens, GreeceHQ checked Sep 23, 2026	201-500	39 contacts →
	Indirect evidence “Since 2005, Optimal HR Group provides unparalleled, bespoke HR services to large organisations and SMEs operating in the EMEA region.” Source: RevenueBase Database · checked Sep 23, 2026
21	Nepa Economic Consulting S.A	Partial evidence	Athens, GreeceHQ checked Sep 23, 2026	51-200	39 contacts →
	Partial evidence “NEPA Economic Consulting, led by CEO Konstantinos Patiris, is a premier financial advisory firm specializing in integrated Tax, Accounting and Business Consulting.” Source: RevenueBase Database · checked Sep 23, 2026
22	Arbitrage Real Estate	Partial evidence	Athens, GreeceHQ checked Sep 23, 2026	51-200	38 contacts →
	Partial evidence “Arbitrage Real Estate is a real estate advisory and development management firm providing a wide spectrum of services in the property sector.” Source: RevenueBase Database · checked Sep 23, 2026
23	Data Noesis	Indirect evidence	Άγιοι Ανάργυροι, GreeceHQ checked Sep 23, 2026	11-50	35 contacts →
	Indirect evidence “Data Noesis follows a market-oriented approach in order to drive each customer in a digital transformation journey, with innovative solutions and professional services.” Source: RevenueBase Database · checked Sep 23, 2026
24	Epidosis	Indirect evidence	Thessaloniki, GreeceHQ checked Sep 23, 2026	11-50	34 contacts →
	Indirect evidence “Η εταιρεία EPIDOSIS Σύμβουλοι Ανάπτυξης Επιχειρήσεων, φέρνει την επανάσταση στην συμβουλευτική και φιλοδοξεί να στηρίξει την επιχειρηματικότητα, προσφέροντας πρακτικές και άμεσες…” Source: RevenueBase Database · checked Sep 23, 2026
25	Tantalus Digital	Indirect evidence	Καβάλα, GreeceHQ checked Sep 23, 2026	51-200	31 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 23, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: advisory and outsourcing services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names advisory and outsourcing services.
Partial evidence: Its own public description names part of advisory and outsourcing services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name advisory and outsourcing services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 781 advisory and outsourcing services based in Greece

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 2,845 reachable decision-makers.

Free signup · no credit card

View the full list →

Advisory and outsourcing services based in Greece at a glance

As of Sep 23, 2026

30.9%Verified-email coverage

1.8%Mobile-number coverage

11.8Average contacts per company

1-10Median size (employees)

30.0%Largest-city concentration · Athens

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

517

11-50

219

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 26.0d

2,0760–30

72731–60

2961–90

090–180

13180+

Company record updated

Median 76.0d

00–30

3,00631–60

3,85461–90

1,90190–180

437180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among advisory and outsourcing services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Greece whose own description of what they do matches “advisory and outsourcing services”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names advisory and outsourcing services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among advisory and outsourcing services, and records with no verified work email. Companies headquartered outside Greece are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 2,845 across the full list. 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 23, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Advisory and outsourcing services by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names advisory and outsourcing services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many advisory and outsourcing services are there based in Greece?

RevenueBase identified 781 advisory and outsourcing services headquartered in Greece as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Grant Thornton Greece, headquartered in Athens, tops this list with the largest team on record.

Which city has the most advisory and outsourcing services?

Athens leads with 234 headquartered companies, followed by Thessaloniki (36) and Marousi (15).

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 2,845 verified decision-maker contacts tracked across these 781 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 23, 2026.

Ready to reach these companies? Verified emails and direct dials for all 781 advisory and outsourcing services based in Greece. Start with a free account, no credit card.

Download this list →

Related lists

Advisory and outsourcing 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 Smart Search, 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.