Top Dark fiber companies | Leaders and Market Insights 2025

Code: MTA3928 Publication Date: Jun 2025

Top Dark fiber companies

The Global dark fiber market is expected to grow at significant rate, valued at approximately USD 5.76 billion in 2024, and projected to exceed USD 14.87 billion by 2031, representing a CAGR of around 14.8%.

The growth of this industry is proliferated by exponential rise in cloud computing, IoT applications, and the global 5G rollout, creating surging requirements for low-latency and secure private networks.

Apart from this, another pivotal driver is the proliferation of cloud and edge data centers, which increasingly rely on dark fiber to support massive interconnectivity demands which makes dark fiber the backbone of next-gen digital infrastructure. Additionally, the growth is further bolstered by telecom operators’ need to boost bandwidth capacities in response to soaring data traffic.

1. Zayo Group

CompanyZayo Group
HeadquartersBoulder, Colorado, USA
Established Year2007 
WebsiteClick here 

Zayo is a major provider of dark fiber infrastructure, offering extensive fiber networks across North America and Europe. It supports carriers, hyperscalers, and enterprises with high-capacity solutions.

2. Crown Castle Inc.

CompanyCrown Castle Inc.
HeadquartersHouston, Texas, USA
Established Year1994
WebsiteClick here 

Crown Castle operates thousands of route miles of fiber and provides dark fiber to support mobile carriers, data centers, and businesses needing scalable bandwidth.

3. Lumen Technologies, Inc.

CompanyLumen Technologies, Inc.
HeadquartersMonroe, Louisiana, USA
Established Year1930  
WebsiteClick here 

Lumen provides one of the largest fiber networks globally, including extensive dark fiber offerings for high-performance, low-latency connectivity solutions.

4. Colt Technology Services Group Limited

CompanyColt Technology Services Group Limited
HeadquartersLondon, United Kingdom
Established Year1992
WebsiteClick here 

Colt delivers dark fiber solutions across Europe and Asia, focusing on enterprise and financial services customers with secure and flexible network infrastructure.

5. euNetworks Group Limited

CompanyeuNetworks Group Limited
HeadquartersLondon, United Kingdom
Established Year2002 
WebsiteClick here 

euNetworks operates metropolitan fiber networks in major European cities and specializes in dark fiber, wavelength, and high-bandwidth services.

6. Lightower Fiber Networks

CompanyLightower Fiber Networks
HeadquartersBoxborough, Massachusetts, USA
Established Year2006 
WebsiteClick here 

Acquired by Crown Castle, Lightower was a key player in the U.S. Northeast, offering custom dark fiber networks for enterprises, carriers, and government.

7. FiberLight, LLC

CompanyFiberLight, LLC
HeadquartersAlpharetta, Georgia, USA
Established Year2005
WebsiteClick here 

FiberLight provides custom-built dark fiber solutions across Texas, the Southeast, and Mid-Atlantic regions, serving industries with mission-critical bandwidth needs.

8. Hexatronic Group AB

CompanyHexatronic Group AB
HeadquartersGothenburg, Sweden
Established Year1993
WebsiteClick here 

Hexatronic delivers fiber optic infrastructure, including passive dark fiber systems, mainly for telecom, enterprise, and municipal networks in Europe and North America.

9. Arelion

CompanyArelion
HeadquartersSolna, Sweden
Established Year2000
WebsiteClick here 

Arelion operates a global backbone with dark fiber capabilities, providing scalable infrastructure to carriers and hyperscale companies across Europe, Asia, and North America.

10. Reliance Jio Infocomm Ltd.

CompanyReliance Jio Infocomm Ltd.
HeadquartersMumbai, Maharashtra, India
Established Year2007
WebsiteClick here 

Jio offers one of the most expansive dark fiber networks in India, catering to telecom providers, ISPs, and enterprise customers with high-capacity connectivity solutions.

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