Stelkom D.o.o.

What Stelkom D.o.o. does

Stelkom d.o.o. is a Slovenian private telecommunications infrastructure provider founded in 2003, headquartered in Trzin and operating an independent backbone optical fiber network of 3,000+ km deployed along the country's power grid using OPGW and OPWR technologies. The company delivers data connectivity, internet access, colocation, and unified communications services exclusively to business customers, anchored by all four major Slovenian telecom operators (Telekom Slovenije, T-2, Telemach, A1 Slovenija) plus international carriers BT, Colt, and Cogent, and supplemented by bank, government, and healthcare clients.

Its core service portfolio spans five categories: high-quality data services (optical line rental at 10–400 Gb/s, Ethernet VPN, IP/MPLS VPN, SDH and DWDM connections, wireless broadband up to 300 Mbit/s, and broadband internet); telecommunications infrastructure; Open Base Stations (collocation on power infrastructure for mobile and broadcasting operators); colocation at the Tivolska 50 and TK node sites; and communication platforms built on NEC UNIVERGE 3C/SV9100/SL2100 and 3CX. International POP collocations in Vienna, Milan, Zagreb, Belgrade, Sarajevo, and Frankfurt support cross-border carrier services, with planned expansion into North Macedonia, the Netherlands, Bulgaria, and Hungary.

Stelkom generates revenue through recurring subscription contracts on multi-year terms with SLA-backed service levels, sold via direct enterprise sales and supported by a 24/7 NOC. Ownership is dominated by METRIMA INTERNATIONAL AB (39.30%) and Slovenian state-controlled electricity utilities — ELES (34.15%), Elektro Celje, HSE, and Elektro Maribor — reflecting the company's co-deployment business model with power grid infrastructure. The company holds ISO 27001 certification (2019) and serves as a carrier for national networks HKOM and ARNES.

Name

Stelkom D.o.o.

Legal name

Stelkom d.o.o.

Website

https://stelkom.si

Company type

Private

Founded year

2003

Operating status

Operating

Headcount range

11–50 employees

Short description

Stelkom d.o.o. is a Slovenian B2B telecommunications infrastructure provider operating a 3,000+ km independent optical fiber backbone along power grid routes, delivering data connectivity, colocation, and unified communications services to telco operators, banks, and government clients across seven countries.

Ownership category

akta.pro rank

Product category

Telecommunications Infrastructure

NAICS

Wired Telecommunications Carriers (517111), Wired and Wireless Telecommunications Carriers (except Satellite) (51711), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518)

SIC

Telephone Communications (No Radiotelephone) (4813), Communications Services, Nec (4899)

akta.pro primary industry

Neutral-Host Fiber & Shared Access Network Operators (HDAIACAJ)

akta.pro secondary industries

Wholesale Wavelength, Spectrum & Dark Fiber Providers (IRU/Leases) (HDAIALAI), Utility Fiber Backbone & Transport Networks (OTN/MPLS, DWDM) (EUADAIAA)

Keywords

• Optical fiber networks
• Telecommunications infrastructure
• Data connectivity services
• Unified communications platforms
• Colocation services

Headquarters

HQ city

Trzin

HQ country

Slovenia

HQ region

Europe

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Optical Fiber Rental: Rental of optical lines on their 3,000+ km backbone network distributed along power grid infrastructure. Capacity ranges from 10-400 Gb/s per fiber.
2. Data Services: High-quality network data services including wireless connections, Ethernet VPN, IP/VPN connections, SDH and DWDM connections, and broadband Internet access for business users.
3. Colocation Services: Rental of technical space at Tivolska 50 and TK nodes (Črnomelj, Šoštanj, Maribor) for customer IT and telecommunications equipment installation with SLA parameters.
4. Communication Platforms: UNIVERGE 3C, SV9100, SL2100 and 3CX communication and UC&C solutions including IP telephony, video conferencing, and unified communications.
5. Open Base Station Collocation: Rental of technically equipped collocation space for mobile operators on electricity infrastructure for base station installation.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Stelkom d.o.o. provides optical fiber network infrastructure and data connectivity services for business customers across Slovenia and selected Central/Southeastern European markets. Its portfolio includes dark fiber and optical line rental on a 3,000+ km backbone deployed along the power grid, Ethernet/IP VPN, SDH and DWDM connections, broadband internet, wireless access, colocation, and unified communications platforms. Services are delivered exclusively to business users under multi-year contracts with SLA-backed reliability guarantees.

Product overview

Stelkom D.o.o. operates as a telecommunications infrastructure and services provider in Slovenia, offering a portfolio of five core service categories: (1) Data Services of High Quality Networks providing optical line rental, wireless connections, Ethernet VPN, IP VPN, SDH/DWDM connections, and broadband internet; (2) Telecommunication Infrastructure as an independent backbone network with over 3,000 km of fiber along power grid routes; (3) Open Base Stations for mobile operator antenna installation on electricity infrastructure; (4) Colocation services at Tivolska 50 and TK nodes; and (5) Communication Platforms including 3CX, UNIVERGE 3C, UNIVERGE SV9100, and SL2100 for unified communications and IP telephony. All services target business users with SLA-backed reliability guarantees.

Differentiator

Problem solved

Functional benefit

Products and services

• Data Services of High Quality Networks Comprehensive business-grade data services portfolio covering optical fiber rental, Ethernet VPN, L3 IP VPN, SDH and DWDM connections, wireless broadband, and broadband internet access for business users under SLA-backed service levels.
• Telecommunication Infrastructure Independent backbone network deployed along Slovenia's power grid with over 3,000 km of optical fiber, built as optical loops supporting SDH, IP MPLS, and DWDM transmission technologies for high reliability.
• Open Base Stations Infrastructure service enabling mobile network operators and broadcasters to install transmitting antennas and equipment on existing electricity transmission line poles, leveraging power grid assets for additional use.
• Colocation Tivolska 50 High-tech colocation space at Tivolska 50 (Ljubljana) and additional TK nodes (Črnomelj, Šoštanj, Maribor) providing secure hosting for IT and telecommunications equipment with uninterruptible power supply (48V DC/230V AC), climate control, antistatic flooring, and 24/7 monitoring and security.
• UNIVERGE 3C Communication Platform Unified communications platform providing IP telephony and UC&C software for up to 24 servers (70,000 users/telephone connections) in HA mode, with video conferencing, whiteboards, screen sharing, and call center agent routing.
• UNIVERGE SV9100 Communication System NEC-branded versatile communications system available as IP, digital, or hybrid configuration, providing unified communications for SMB and enterprise, supporting mobile, desktop, and portable devices with all applications in one device.
• SL2100 Communication System NEC-branded VoIP unified communications system designed for small businesses, including IP desktops, voicemail, auto attendant, and ST500 smartphone app for video collaboration.
• 3CX Communication Solution Open-standards unified communications solution providing IP PBX with CRM integrations (Office 365, Salesforce, Freshdesk), embedded WebRTC video conferencing, SIP trunk support, and clients for Android, iOS, and web, marketed at up to 80% cost reduction vs traditional PBX.

Quantifiable outcome

• Up to 400 Gb/s optical fiber capacity
• +4 more outcomes

Named customers10 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration6 records

Feature8 records

Partnerships

20 partnerships are on record, tiered core and minor.

• ELES d.o.o.coreStrategic or Co-development Partner · 1 January 2003Ownership stake of 34.15%. Partner in electricity system providing infrastructure for optical fiber network deployment along power grid.
• ELEKTRO CELJE d.d.coreStrategic or Co-development PartnerOwnership stake of 7.68%. Partner electricity distribution company.
• HSE d.o.o.coreStrategic or Co-development PartnerOwnership stake of 7.35%. Holding Slovenske elektrarne partner.
• ELEKTRO MARIBOR d.d.coreStrategic or Co-development PartnerOwnership stake of 3.84%. Partner electricity distribution company.
• ELEKTRO LJUBLJANA d.d.coreStrategic or Co-development PartnerPartner electricity distribution company enabling network infrastructure.
• ELEKTRO PRIMORSKA d.d.coreStrategic or Co-development PartnerPartner electricity distribution company enabling network infrastructure.
• British Telecom (BT)coreTechnology or IntegrationGlobal telecommunications operator using Stelkom's optical network services since 2005. Important international customer.
• ColtcoreTechnology or IntegrationInternational operator renting optical network services.
• CogentcoreTechnology or IntegrationInternational operator renting optical network services.
• HitachiminorStrategic or Co-development PartnerNEDO project partner - establishment of wide technological spectrum of various telecommunication connections for foreign partner.
• NECcoreTechnology or IntegrationTechnology partner for UNIVERGE 3C, SV9100, and SL2100 communication systems and IP DECT handsets.
• 3CXcoreTechnology or IntegrationCommunication solution provider for 3CX phone system offering unified communications.
• InterxioncoreTechnology or IntegrationData center provider for POP collocations in Vienna and Frankfurt locations.
• MIX s.r.l. (Milan)coreTechnology or IntegrationData center provider for POP collocation in Milan, Italy.
• Telekom SlovenijecoreTechnology or IntegrationSlovenian telecommunications operator renting optical network services.
• T-2coreTechnology or IntegrationSlovenian telecommunications operator renting optical network services.
• TelemachcoreTechnology or IntegrationSlovenian telecommunications operator renting optical network services.
• A1 SlovenijacoreTechnology or IntegrationSlovenian telecommunications operator renting optical network services.
• ARNEScoreStrategic or Co-development PartnerOne of the most important carriers of national telecommunications infrastructure ARNES network.
• HKOMcoreStrategic or Co-development PartnerOne of the most important carriers of national telecommunications infrastructure HKOM.

Scale indicators7 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Colt Technology Services: Global B2B-focused provider of wavelength, Ethernet, and SDN services on owned fiber. Listed as a Stelkom wholesale customer in Slovenia and competes head-on in the international wavelength/dark fiber segment Stelkom serves into 7 countries.
• RETN: Independent European network operator focused on wholesale IP, Ethernet, and wavelength services with strong CEE and Balkan presence. Closely comparable to Stelkom's wholesale model and increasingly relevant as Stelkom targets additional Balkan POPs.
• T-2 d.o.o. Slovenian alternative telecom operator providing fiber, IPTV, and mobile services. Competes with Stelkom for the same Slovenian enterprise and wholesale customers and is also one of Stelkom's largest wholesale fiber tenants, making it both a customer and a direct competitor in downstream enterprise connectivity.
• Arelion (formerly Telia Carrier): Global wholesale IP backbone and wavelength provider with strong presence across Europe. Competes with Stelkom's international wavelength service for carriers and enterprises needing high-capacity routes into and out of Slovenia and the Balkans.
• euNetworks: European wholesale fiber operator owning and operating dense metropolitan and long-haul networks across Western and parts of CEE Europe. Closest direct competitor to Stelkom in the wholesale wavelength/dark fiber category for cross-border enterprise and carrier customers.
• Telemach (Slovenia): Slovenian cable and mobile operator (part of United Group) operating hybrid fiber-coax and mobile networks. Overlaps with Stelkom in wholesale fiber procurement (cited as a customer) and competes for enterprise broadband and connectivity customers in Slovenia.

Others

• Interxion (Digital Realty): European colocation and data center provider that hosts two of Stelkom's key POPs (Vienna and Frankfurt). Both a critical infrastructure partner and a comparable operator for the colocation portion of Stelkom's business.

Broad incumbents

• Telekom Slovenije: Incumbent Slovenian operator offering fixed, mobile, IPTV, cloud, and enterprise services across the country. Stelkom's largest wholesale customer and principal competitor for enterprise connectivity; has substantially broader portfolio and balance sheet.
• A1 Slovenija: Subsidiary of A1 Telekom Austria Group, one of Slovenia's four major telecom operators offering mobile, fixed, and enterprise services. Stelkom's wholesale customer and a competitor for enterprise connectivity, but backed by a much larger pan-European parent with broader capabilities.
• Lumen Technologies: Global enterprise and wholesale fiber/ wavelength provider with extensive European backbone. Competes with Stelkom in the wholesale wavelength segment served from Stelkom's Interxion POPs in Frankfurt and Vienna.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/stelkom

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Stelkom D.o.o.