Company lists · Data refreshed September 2026

Top 15 Infrastructure companies based in Slovenia

RevenueBase identified 30 infrastructure companies headquartered in Slovenia as of September 2026 and tracks 313 professional contacts across them, including 138 with verified work emails. Ljubljana is the largest hub.

This list covers infrastructure companies headquartered in Slovenia, 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 15, 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 15, 2026 86% judged on-target in blind review
30Companies
313Contacts tracked
138Verified emails
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The 15 largest infrastructure companies based in Slovenia

Ranked by team size
Top 15 of 30 infrastructure companies based in Slovenia, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to infrastructure companies: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceLjubljana, SloveniaHQ checked Sep 15, 202611-5069 contacts →

Indirect evidence

“Interenergo is an international Ljubljana-based energy company and one of the largest of its kind in Slovenia.”

Source: RevenueBase Database · checked Sep 15, 2026
2Indirect evidenceLjubljana, SloveniaHQ checked Sep 15, 2026201-50057 contacts →

Indirect evidence

“DRI upravljanje investicij, d.”

Source: RevenueBase Database · checked Sep 15, 2026
3Indirect evidenceLjubljana, SloveniaHQ checked Sep 15, 202611-5029 contacts →

Indirect evidence

“SINCE 1953 PNZ is one of the leading project design companies in Slovenia.”

Source: RevenueBase Database · checked Sep 15, 2026
4Indirect evidence1236 Trzin, SloveniaHQ checked Sep 15, 202611-5016 contacts →

Indirect evidence

“No.1 Backbone network in Slovenia.”

Source: RevenueBase Database · checked Sep 15, 2026
5Strong evidenceLjubljana, SloveniaHQ checked Sep 15, 202651-2009 contacts →

Strong evidence

“Complete Energy Solutions C&G is a forward-looking engineering, innovative, development and marketing-oriented company with a long tradition in energy infrastructure.”

Source: RevenueBase Database · checked Sep 15, 2026
6Indirect evidenceMaribor, SloveniaHQ checked Sep 15, 202611-505 contacts →

Indirect evidence

“Civil engineering company based in Maribor, Slovenia.”

Source: RevenueBase Database · checked Sep 15, 2026
7Strong evidenceLesce, SloveniaHQ checked Sep 15, 202611-505 contacts →

Strong evidence

“We are producer and seller of products for the construction communal infrastructure.”

Source: RevenueBase Database · checked Sep 15, 2026
8Indirect evidenceMedvode, SloveniaHQ checked Sep 15, 202651-2005 contacts →

Indirect evidence

“Smo strokovnjaki za proizvodnjo električne energije.”

Source: RevenueBase Database · checked Sep 15, 2026
9Indirect evidenceLjubljana, SloveniaHQ checked Sep 15, 20261-104 contacts →

Indirect evidence

“Adventura Investments investira v večinske deleže perspektivnih podjetij, ki jih želi poslovno in finančno prestrukturirati, razširiti njihovo poslovanje in jih popeljati v…”

Source: RevenueBase Database · checked Sep 15, 2026
10Strong evidencePoljčane, SloveniaHQ checked Sep 15, 20261-104 contacts →

Strong evidence

infrastructure project design”

Source: RevenueBase Database · checked Sep 15, 2026
11Indirect evidenceMaribor, SloveniaHQ checked Sep 15, 20261-104 contacts →

Indirect evidence

“Podjetje se ukvarja z izdelavo projektne dokumentacije, prometnih in okoljskih študij, svetovalnega inženiringa in strokovnega nadzora na področju inženirskih objektov.”

Source: RevenueBase Database · checked Sep 15, 2026
12Indirect evidenceTrebnje, SloveniaHQ checked Sep 15, 20261-103 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 15, 2026
13Indirect evidenceŠempeter Pri Gorici, SloveniaHQ checked Sep 15, 20261-103 contacts →

Indirect evidence

“We are a leading construction company specializing in an integrated approach to the design of building structures, building control, geological geomechanical surveys, high-rise…”

Source: RevenueBase Database · checked Sep 15, 2026
14Indirect evidenceLjubljana, SloveniaHQ checked Sep 15, 202611-502 contacts →

Indirect evidence

“We belive in quality construction of energy facilities, reconstruction and maintenance of electricity facilities to the satisfaction of our costumers,partners and employees and…”

Source: RevenueBase Database · checked Sep 15, 2026
15Indirect evidenceLjubljana, SloveniaHQ checked Sep 15, 20261-101 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 15, 2026

Showing 15 of 30 infrastructure companies based in Slovenia

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Infrastructure companies based in Slovenia at a glance

As of Sep 15, 2026
44.1%Verified-email coverage
10.4Average contacts per company
11-50Median size (employees)
30.0%Largest-city concentration · Ljubljana
Sep 15, 2026Page data refreshed

Companies by employee count

1-10
13
11-50
11
51-200
4
201-500
2

Email recency for this list is measured worldwide rather than for Slovenia, so it is reported there. Company counts and contact totals on this page are exact for Slovenia, over 30 companies.

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 infrastructure companies, 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 Slovenia whose own description of what they do matches “infrastructure companies”. 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 infrastructure companies), 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 infrastructure companies, and records with no verified work email. Companies headquartered outside Slovenia 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, 138 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 15, 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.

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 infrastructure companies, 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 infrastructure companies are there based in Slovenia?

RevenueBase identified 30 infrastructure companies headquartered in Slovenia 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?

Interenergo Group, headquartered in Ljubljana Ljubljana, tops this list with the largest team on record.

Which city has the most infrastructure companies?

Ljubljana leads with 9 headquartered companies, followed by Maribor (3) and Ljubljana Ljubljana (2).

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 138 verified decision-maker contacts tracked across these 30 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 15, 2026.

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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.