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Zayo Group

Zayo Group Holdings, Inc. is a privately held American communications infrastructure company headquartered in , that provides and services to carriers, enterprises, government agencies, and content providers worldwide. Founded in 2007 by entrepreneur Dan Caruso and a team of industry veterans, the company initially focused on acquiring and integrating regional fiber networks to build a national backbone, starting with assets like Memphis Networx and Onvoy Inc. Through aggressive expansion via 47 acquisitions, Zayo grew into one of the largest independent providers of high-capacity optic infrastructure, offering services such as dark , wavelengths, Ethernet, , dedicated , and . Its network spans over 18.7 million miles (as of March 2025), connecting more than 1,700 , 350 points of presence, and 375 IP points of presence across major markets in and , with capabilities supporting 400G and 800G transmission speeds to enable technologies like , , and . Zayo went public on the in 2014 under the ticker ZAYO but was taken private in 2020 through a $14.3 billion acquisition by a led by EQT and Digital Colony (now ). As of 2025, the company remains under ownership, primarily by and EQT Infrastructure, and continues to pursue growth through strategic deals, including a pending $4.25 billion acquisition of Crown Castle's fiber solutions business announced in March 2025, subject to regulatory approvals, expected to close in the first half of 2026.

History

Founding

Zayo Group was established in August 2007 in , by a team of entrepreneurs led by Dan Caruso as CEO. The company was formed as a corporation with a focus on addressing unmet needs in the bandwidth infrastructure market following the consolidation of major fiber networks during the dot-com bust. Co-founders included John Scarano and Matt Erickson, who shared Caruso's vision for building a specialized provider of high-capacity connectivity solutions. The initial emphasized providing infrastructure services to carriers and enterprises, starting with dark and offerings to enable scalable, high-speed data transmission. This approach targeted the growing demand for reliable -based connectivity in an era when many legacy networks were underutilized or fragmented. Zayo's strategy involved aggregating and optimizing existing dark assets while investing in new builds to create a robust national footprint. In its early years, Zayo made organic investments in fiber networks, particularly in the , including the development of its first major intercity route between and to support long-haul needs. These investments laid the groundwork for a designed for wholesale and customers seeking dedicated capacity without the overhead of traditional carriers. Dan Caruso, the driving force behind the founding, drew on his extensive background in the , where he had served as a co-founding executive at and as president and CEO of ICG Communications, roles that honed his expertise in scaling fiber infrastructure and wholesale services. His prior experience at Metropolitan Fiber Systems (MFS), which pioneered metro fiber networks before its acquisition by WorldCom, further informed Zayo's focus on efficient, asset-light bandwidth delivery.

Growth through acquisitions

Zayo Group's expansion from its inception was propelled by a series of strategic acquisitions that rapidly scaled its fiber optic infrastructure across . In late , shortly after its founding, the company completed its initial purchases, including Networx for $9.2 million, Telcom for $46.3 million, and Fiber Works for $22.6 million, which collectively added thousands of route miles of regional networks in the Mid-South, , and the Midwest. A pivotal deal occurred in 2011 when Zayo acquired 360networks for $319 million, significantly broadening its footprint into and the with an additional 4,100 route miles of intercity fiber and enhanced metropolitan connectivity in over a dozen markets. This move marked Zayo's 17th acquisition and strengthened its position as a cross-border bandwidth provider. The most transformative acquisition took place in with the $2.2 billion purchase of AboveNet, a provider of high-bandwidth services, which nearly doubled Zayo's overall size and integrated AboveNet's 16,000 route miles of , resulting in a combined spanning over 61,000 route miles across 45 U.S. states, Washington, D.C., and seven countries in and . The deal also expanded access to approximately 9,000 buildings, including major data centers and carrier points of presence, bolstering Zayo's enterprise and wholesale offerings. Over the subsequent years, Zayo continued this acquisitive approach, completing a total of 45 deals by 2020 to interconnect disparate fiber assets into a unified national backbone. Notable among these was the 2018 acquisition of for an undisclosed sum, which added specialized dark fiber routes optimized for ultra-low applications in financial markets, further diversifying Zayo's portfolio beyond traditional bandwidth services. This strategy emphasized the purchase of existing fiber networks—often from distressed or legacy providers—to minimize expenditures on construction while accelerating the development of a dense, scalable capable of supporting surging demands. By integrating these assets, Zayo avoided the protracted timelines and high costs of organic expansion, enabling it to establish a competitive edge in the communications sector.

Initial public offering and privatization

Zayo Group Holdings, Inc. completed its (IPO) on October 17, 2014, listing on the under the ZAYO. The company priced 21,052,631 shares at $19 per share, raising approximately $400 million in gross proceeds, though the final count including the underwriters' option reached 24,079,002 shares upon completion. This IPO valued Zayo at about $5.35 billion based on the offering price, reflecting its growth through prior acquisitions that expanded its fiber network infrastructure. Following the IPO, Zayo experienced significant revenue growth, driven by network expansions and increased demand for services. For the fiscal year ended June 30, , the company reported revenue of $1.1 billion, which rose to $2.58 billion by the fiscal year ended June 30, 2019. This expansion allowed Zayo to invest further in its communications infrastructure while navigating public market expectations. In March 2020, Zayo was taken private through an acquisition by affiliates of Digital Colony Partners and , in a valued at $14.3 billion including $5.9 billion in existing debt. The deal provided shareholders with $35 per share in cash, representing a 14.3% premium to the prior closing price, and resulted in Zayo's delisting from the NYSE. This enabled the company to restructure its debt and shift focus toward long-term infrastructure investments without the pressures of quarterly public reporting.

Spin-offs and recent developments

In 2014, Zayo Group completed the of its and business, Onvoy, LLC, to Communications Infrastructure Investments, LLC (CII), a move that allowed Zayo to concentrate resources on its core fiber-based communications infrastructure operations. The transaction, reported as an equity distribution, separated Onvoy's wholesale services from Zayo's growing assets, enabling streamlined focus on bandwidth and services. In March 2025, Zayo, in partnership with EQT, agreed to acquire Crown Castle's Fiber Solutions business for $4.25 billion, adding about 90,000 route miles of fiber and expanding on-net locations to over 70,000 while strengthening metro density in major U.S. markets. This deal, expected to close in the first half of 2026 subject to regulatory approvals and customary closing conditions, aligns with Zayo's post-privatization emphasis on scaling infrastructure for high-bandwidth applications. Complementing this, Zayo completed a significant in September 2025, extending 2027 secured debt maturities to March 2030 and 2028 unsecured debt to September 2030, with over 99.8% creditor participation and a $2 billion paydown using asset-backed proceeds. Post-2020, Zayo has strategically pivoted toward meeting surging demand for fiber capacity driven by and , investing over $20 billion in network expansions including 5,000 new route miles announced in early 2025 to support AI workloads projected to grow 2-6X by 2030. In November 2025, Zayo completed the 622-mile Umatilla-Prineville-Reno long-haul route, enhancing connectivity for AI data centers in the western U.S. as part of its ongoing network expansion efforts. This shift, enabled by backing, positions Zayo to capitalize on AI's infrastructure needs through enhanced long-haul and metro connectivity.

Operations

Network infrastructure

Zayo Group's network infrastructure forms the core of its operations, encompassing an extensive fiber optic backbone that supports high-bandwidth connectivity across multiple continents. As of 2025, the company maintains over 19.5 million fiber miles worldwide, with approximately 16.8 million fiber miles concentrated in , extending into and . This infrastructure includes subsea cables for transoceanic connectivity, such as multiple subsea routes in , including connections like London to via the ZEUS cable and to , alongside transpacific links, and metro dark fiber networks in urban areas for last-mile access. Key assets include a national backbone in the United States comprising over 147,000 route miles, enabling long-haul transport across diverse geographies. The supports high-capacity wavelengths up to 400G, with 100% of its North American core Dense (DWDM) systems 400G-enabled as of July 2025, facilitating efficient long-haul data transmission. Additionally, Zayo connects more than 1,700 data centers globally, enhancing proximity to end-users and reducing for critical applications. The 2025 acquisition of Crown Castle's Fiber Solutions business, announced in March and expected to close in early 2026, will significantly enhance Zayo's urban fiber density in over 30 major U.S. markets, adding approximately 90,000 route miles and connecting to more than 44,000 additional on-net , bringing the total to over 100,000 supported structures. This integration complements Zayo's existing reach of more than 52,000 on-net across over 400 global metro markets. Strategic acquisitions, such as this one, have been instrumental in scaling the network without proportional increases in new construction. In November 2025, Zayo completed the 622-mile Umatilla-Prineville-Reno (UPR) long-haul fiber route in the western U.S., connecting key data centers and supporting growth. Technologically, Zayo employs DWDM systems for scalable long-haul transport, with ongoing investments in 400G and 800G upgrades to accommodate surging workloads and data-intensive applications. These enhancements include new routes and full 400G enablement across its points of presence in , ensuring capacity for exponential growth projected through 2030. The company also operates extensive routes, including 11 unique long-haul paths in , providing resilient, low-latency options for wholesale and needs.

Services portfolio

Zayo Group's services portfolio encompasses a range of and solutions tailored for high-performance needs, leveraging its extensive to deliver reliable to carriers, enterprises, and hyperscalers. The offerings focus on scalable, low-latency transport and edge capabilities, enabling customers to support data-intensive applications such as , cloud migration, and deployment. Core offerings include services for multi-terabit, low-latency transport, Ethernet solutions for high- point-to-point connectivity, transit via a Tier-1 backbone spanning million miles, and dark fiber leasing that provides dedicated, unmanaged capacity for custom builds. These services cater primarily to hyperscalers and telecom carriers requiring robust backbone infrastructure for global data flows. Edge solutions feature access in over 1,700 connected centers worldwide, cross-connects for seamless interconnections, and managed services enhanced by the 2022 acquisition of QOS Networks, which integrated AI-driven monitoring and secure edge networking. These capabilities support closer to end-users, reducing for real-time applications. Specialized services include CloudLink, a private connectivity platform offering dedicated links to over 50 cloud providers such as AWS and , ensuring secure, high-uptime access with 100% guarantees. For and , Zayo provides wireless backhaul and infrastructure support to service providers, while lit services like 400G wavelengths and private Ethernet networks serve the media and entertainment sector, powering content delivery for major streaming platforms and live events—connecting nine of the top 10 media companies. The portfolio targets wholesale customers, including carriers and telecoms that account for the majority of revenue, alongside enterprise clients comprising mid-to-large organizations seeking dedicated connectivity. Zayo serves over 400 global markets across North America, Europe, and Asia-Pacific, facilitating international expansion for multinational operations. In recent years, Zayo has evolved toward a fiber-centric strategy, emphasizing high-margin dark fiber and long-haul routes optimized for workloads, with over 5,000 new fiber miles under in 2025 to meet surging demand projected to grow 2-6x by 2030. This shift prioritizes premium infrastructure over lower-margin commoditized services, aligning with trends in bandwidth explosion driven by and .

Leadership and governance

Executive team

Steve Smith has served as of Zayo Group since October 2020, where he oversees the company's overall strategy and operations in the communications infrastructure sector. With over 30 years of experience in technology leadership, Smith previously served as CEO of from 2007 to 2018, guiding the company through significant growth in data center and interconnection services, and later as a managing director at GI Partners, focusing on infrastructure investments. Chris Brown was appointed President and in October 2025, responsible for driving operational excellence and integrating recent acquisitions such as Crown Castle's fiber network to enhance Zayo's capabilities. brings more than 30 years of executive experience in , , and utilities, including roles as CEO of —a company—where he led global operational transformations, and as CEO of Wind Systems, emphasizing scalable operations in complex industries. Jeff serves as , managing Zayo's global functions following the company's in 2020, with a focus on financial strategy for private equity-backed growth. Appointed in April 2023, Noto has over 35 years of expertise, primarily from , where he was senior vice president and CFO for the Global Network and Technology division, overseeing budgeting and reporting for large-scale operations. Julie Tschida Brown is Chief People and Culture Officer, leading initiatives in , employee experience, and to support Zayo's workforce of over 3,000. Since joining in October 2020, she has drawn on more than 20 years of global HR leadership, including her prior role as Chief People Officer at Transamerica, where she developed strategies for and business alignment in dynamic environments. Nikos Katinakis holds the position of , directing innovations in network , integration, and infrastructure scalability. Appointed in February 2024, Katinakis leverages over 30 years in technology, with previous executive roles at focusing on network evolution and . Dan Caruso, Zayo's founder, transitioned from the CEO role in 2020 after leading the company since its inception in 2007, and is credited with pioneering its aggressive acquisition strategy that built a global network. He now operates as Managing Director of Caruso Ventures, providing advisory insights drawn from Zayo's growth to $14 billion enterprise value.

Ownership structure

Zayo Group is primarily owned by EQT Infrastructure and , which acquired the company in a valued at $14.3 billion in 2020, taking it private through a partnership between EQT Infrastructure and . Following the announcement of Zayo's $4.25 billion acquisition of Castle's Solutions business in March 2025—expected to close in early 2026—the transaction is anticipated to expand Zayo's scale in infrastructure. The Board of Directors comprises representatives from key investors, including Doug Gilstrap from EQT, who brings expertise in technology and telecommunications investments, alongside independent directors such as Kevin Turner (Chairman) and Steve Smith (CEO). In January 2025, David R. Carey was appointed to the board, adding over 45 years of financial and operational experience in telecom and energy sectors to support strategic financing initiatives. As a privately held entity since its 2020 delisting from public markets, Zayo's governance structure emphasizes long-term decision-making without the pressures of quarterly , enabling focused investments in network expansion. This private framework aligns executive reporting directly to the investor-led board, fostering stability for infrastructure projects. Zayo's funding history underscores its backing, with the 2020 LBO providing initial capital for growth. In 2025, the company executed a significant amend-and-extend on its debt, extending secured maturities from 2027 to March 2030 and unsecured notes from 2028 to September 2030, supported by over 99% creditor participation to optimize and fund ongoing operations. This ownership and governance model strategically aligns Zayo with infrastructure-focused investors like EQT and , supporting sustained capital expenditures in fiber networks to meet rising demand from and growth, without short-term profit constraints.

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