BIG Fiber

What BIG Fiber does

BIG Fiber (formerly Bandwidth IG, rebranded May 2025) is a U.S. metro dark fiber infrastructure provider headquartered in Sunnyvale, California, founded in June 2019. The company builds and operates 100% underground, purpose-built metro dark fiber networks across three primary markets: the San Francisco Bay Area (310+ route miles, 2M+ fiber miles, 65+ data centers), Greater Atlanta (170+ route miles, 300,000+ fiber miles, 25+ data centers), and Greater Portland (20+ route miles, 34,000+ fiber miles, 15+ data centers), with a combined footprint projected to reach 850 route miles and 3M+ fiber miles by early 2027.

The company monetizes its dark fiber through long-term, recurring lease agreements with data center operators, hyperscalers, large enterprises, and wireless carriers. Pricing is custom and quote-based, structured around fiber count, route diversity, and contract length. The core product portfolio centers on Dark Fiber Infrastructure, supported by three solution layers: Data Center Connect (facility-to-facility connectivity), Corporate Connect (enterprise network solutions), and Custom Data Center Solutions (bespoke builds). All offerings run on the same purpose-built, 100% underground, high-fiber-count network intentionally routed to minimize overlap with legacy competitors and minimize signal loss and latency.

BIG Fiber distributes exclusively through direct enterprise field sales, supported by strategic on-net partnerships with anchor data center operators including CoreSite, QTS Realty Trust, EdgeConneX, Switch Communications, Digital Realty Trust, Flexential, and Colovore. The company is privately held and backed by Columbia Capital, SDC Capital Partners, Stonepeak Credit, and La Caisse (CDPQ), having closed approximately $390M of debt financings including a $140M green loan facility (May 2024) and a $250M debt facility with $100M accordion (May 2026). Leadership is led by CEO Bruce Garrison (joined December 2022, 20+ years of fiber infrastructure experience) and a team heavily staffed with former Zayo executives.

Name

BIG Fiber

Legal name

Bandwidth Infrastructure Group CA, LLC

Website

https://bigfiber.com

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

11–50 employees

Short description

BIG Fiber builds and operates 100% underground metro dark fiber networks across the San Francisco Bay Area, Greater Atlanta, and Greater Portland, leasing long-term high-capacity fiber connectivity to data center operators, hyperscalers, large enterprises, and wireless carriers.

Ownership category

akta.pro rank

Product category

Telecommunications Infrastructure

NAICS

Power and Communication Line and Related Structures Construction (237130)

SIC

Water, Sewer, Pipeline, Comm & Power Line Construction (1623)

akta.pro primary industry

Subsea & Terrestrial Backhaul to Data Centers and Cloud On-Ramps (IX/DC Interconnect) (HDAIALAJ)

akta.pro secondary industries

Wholesale Wavelength, Spectrum & Dark Fiber Providers (IRU/Leases) (HDAIALAI), Open-Access Fiber Network Operators (Wholesale-Only) (HDAIACAF)

Keywords

• Dark fiber infrastructure
• Metro fiber networks
• Data center connectivity
• Enterprise fiber leasing
• Telecommunications infrastructure

Headquarters

HQ city

Sunnyvale

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Dark Fiber Leasing: BIG Fiber generates revenue through long-term leasing of dark fiber infrastructure to enterprises, data centers, hyperscalers, and network operators. Contracts are typically multi-year agreements providing recurring revenue. The company owns and operates its networks entirely, allowing custom solutions and direct customer relationships.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

BIG Fiber builds, owns, and operates metro dark fiber networks in the San Francisco Bay Area, Greater Atlanta, and Greater Portland. The company leases 100% underground, high-count dark fiber capacity to data center operators, hyperscalers, and enterprises on multi-year contracts. It also delivers custom network builds and turnkey connectivity solutions tailored to enterprise and data center customer requirements.

Product overview

BIG Fiber (formerly Bandwidth IG) offers a unified dark fiber infrastructure platform providing high-capacity, low-latency metro networks across three U.S. markets: San Francisco Bay Area, Greater Atlanta, and Greater Portland. The product portfolio centers on Dark Fiber Infrastructure as the core offering, supported by three solution layers: Data Center Connect for facility-to-facility connectivity, Corporate Connect for enterprise network needs, and Custom Data Center Solutions for bespoke builds. All offerings leverage the same 100% underground, purpose-built dark fiber network designed for AI-era infrastructure demands.

Differentiator

Problem solved

Functional benefit

Products and services

• Dark Fiber Infrastructure BIG Fiber's core offering consists of metro dark fiber networks in the San Francisco Bay Area, Greater Atlanta, and Greater Portland markets. The 100% underground networks provide high-density, low-latency fiber connectivity for data centers, hyperscalers, and enterprises, leased on multi-year contracts.
• Data Center Connect A solution that creates secure, seamless, always-on connections between data center facilities and providers using ultra-dense, high-capacity metro dark fiber networks throughout San Francisco Bay Area, Greater Atlanta, and Greater Portland.
• Corporate Connect Enterprise network solutions providing scalable, flexible metro dark fiber connectivity for businesses needing to transmit data between data centers, corporate headquarters, and other locations with low latency and high bandwidth.
• Custom Data Center Solutions Bespoke network design and construction services that create custom connectivity solutions tailored to unique enterprise requirements, leveraging existing network infrastructure to reduce costs and construction timelines.

Quantifiable outcome

• Network expansion adding 205 route miles and 165,000 fiber miles in Greater Atlanta
• +2 more outcomes

Named customers7 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Seven partnerships are on record, tiered major and core.

• CoreSitemajorTechnology or Integration · 19 January 2026Strategic expansion into CoreSite's SV1 data center in San Jose. BIG Fiber now present in majority of major Bay Area carrier hotels, creating a dark fiber ring. Partnership enables AI-enabled network connectivity.
• EXA InfrastructurecoreStrategic or Co-development Partner · 1 December 2025Strategic partnership to transform Atlanta into a transatlantic digital gateway. Collaboration combines local dark fiber connectivity with EXA's international network infrastructure, enabling global reach from Atlanta.
• FlexentialmajorTechnology or Integration · 29 May 2024Partnership to offer dark fiber connectivity in Greater Atlanta. Flexential is a leading provider of secure and scalable data center solutions. The partnership delivers dark fiber to a rapidly growing data center hub.
• Digital Realty TrustmajorTechnology or IntegrationPartnership providing dark fiber connectivity across Digital Realty's Silicon Valley and Atlanta data center campuses on PlatformDIGITAL. BIG Fiber reaches 13 Digital Realty facilities in Silicon Valley and provides diverse connectivity to all Atlanta locations.
• Switch CommunicationsmajorTechnology or IntegrationAgreement to provide dark fiber for Switch's Keep Campus in Atlanta. Partnership enables diverse transport connectivity for customers to access massive capacity in exascale colocation environment.
• EdgeConneXmajorTechnology or IntegrationBIG Fiber available at EdgeConneX's Atlanta data center campus (ATL01 and ATL02). Partnership increases high-capacity connectivity options for enterprises and service providers at the campus.
• QTS Realty TrustmajorTechnology or IntegrationPartnership establishing BIG Fiber's core presence at QTS Atlanta Metro mega data center campus. Eight separate fiber rings interconnect at QTS facility, making it the epicenter of next-generation fiber connectivity in Atlanta.

Scale indicators12 records

Recent moves7 records

Expansion highlights5 records

Others

• Bandwidth (formerly Bandwidth Inc.): Communications platform providing enterprise CPaaS and fiber services. Not a direct dark fiber competitor, but the brand overlap with "Bandwidth IG" (BIG Fiber's prior name) and adjacency in enterprise communications infrastructure make it a thematically related ecosystem participant.

Direct peers

• Lightpath: Metro-focused dark fiber and connectivity provider owned by Altice USA. Lightpath sells dedicated fiber, wavelength, and Ethernet services to enterprises, carriers, and data centers across major US metros, directly overlapping BIG Fiber's value proposition and customer profile.
• SummitIG: Purpose-built, 100% underground metro dark fiber operator serving data centers and enterprises across multiple US markets. Founded by Bill Cook (now BIG Fiber's Chairman), SummitIG is the closest comparable in network philosophy, customer mix, and go-to-market motion.
• FiberLight: Provider of high-capacity metro and long-haul dark fiber lit services to enterprises, carriers, and data centers across 30+ US markets. Comparable in offering dark fiber to data center hubs and competing for similar enterprise and wholesale customers.
• Zayo Group: Large US/European fiber operator owning deep metro and long-haul dark fiber networks. Zayo is BIG Fiber's most direct competitor for dark fiber leases to data centers and enterprises, and the prior employer of multiple BIG Fiber executives (Garrison, Lochridge, Yost, Munn).

Emerging players

• Exa Infrastructure: Subsea and terrestrial long-haul fiber operator focused on Europe-to-North America routes. BIG Fiber's strategic partner for the Atlanta transatlantic gateway initiative; adjacency makes EXA a useful comparable for international gateway ambitions even though the core footprint differs.
• Cologix: Interconnection-focused data center operator with North American facilities and adjacent dark fiber offerings. Relevant peer because Cologix sits at the intersection of data centers and connectivity, often partnering with dark fiber providers like BIG Fiber to deliver enterprise solutions.

Broad incumbents

• Consolidated Communications: US fiber and business communications provider offering dark fiber, Ethernet, and wavelength services to enterprises and carriers across metro and regional footprints. Competes in the same wholesale/enterprise dark fiber segment, though with a broader telecom portfolio.
• Crown Castle Fiber: Owner/operator of dense US metro fiber networks (~90k route miles) and macro towers, offering dark fiber and wavelength services to carriers and enterprises. Overlaps BIG Fiber's metro dark fiber business as part of a broader infrastructure portfolio including towers and small cells.
• Lumen Technologies: Large incumbent US carrier owning one of the largest fiber footprints globally with significant metro and intercity dark fiber and lit service offerings. Competes for the same data center and enterprise customers as BIG Fiber but as part of a much broader portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/BandwidthIg
• LinkedInlinkedin.com/company/40875659

Revenue estimate

Valuation estimate

Number of profiles

Profiles16 records

Funding overview

Funding rounds1 record

Investors2 records

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 BIG Fiber