Form S-1/A

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Approximate date of commencement of proposed sale to the public: As soon as practicable after this registration statement becomes effective.

If the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 check the following box. ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, or until the registration statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

The information in this preliminary prospectus is not complete and may be changed. We and the selling stockholders may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This preliminary prospectus is not an offer to sell these securities, and we are not soliciting offers to buy these securities in any state where the offer or sale is not permitted.

This is Zayo Group Holdings, Inc.’s initial public offering. We are selling 11,100,000 shares of our common stock, and the selling stockholders identified in this prospectus, including certain members of our senior management, are selling 17,800,000 shares of our common stock. We will not receive any of the proceeds from the sale of shares to be offered by the selling stockholders. We expect the public offering price to be between $21.00 and $24.00. Prior to this offering, there has been no public market for the shares.

We expect to apply to list our common stock on the New York Stock Exchange under the symbol ZAYO.

Investing in our common stock involves risks. See “Risk Factors” beginning on page 16 to read about factors you should consider before buying our common stock.

The underwriters have the option to purchase up to an additional 4,335,000 shares from the selling stockholders, at the initial public offering price, less the underwriting discount.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or the accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The underwriters expect to deliver the shares of common stock to purchasers on or about , 2014.

You should rely only upon the information contained in this prospectus or in any free writing prospectus prepared by or on behalf of us. None of us, the underwriters, or the selling stockholders have authorized anyone to provide you with additional or different information. If anyone provides you with additional, different or inconsistent information, you should not rely on it. If you are in a jurisdiction where offers to sell, or solicitations of offers to purchase, shares of our common stock are unlawful, or if you are a person to whom it is unlawful to direct these types of activities, then the offer presented in this document does not extend to you. You should assume the information appearing in this prospectus is accurate only as of the respective dates of such information. Our business, financial condition, results of operations, and prospects may have changed since those dates.

In this prospectus, we rely on and refer to information and statistics regarding our industry, including papers produced by: Cisco Systems, Inc., entitled “Visual Networking Index (VNI) Global Mobile Data Traffic Forecast Update Feb-2014” and “VNI Global IP Traffic Forecast, 2013-2018;” Gartner, Inc., entitled “Forecast: The Internet of Things, Worldwide, 2013;” Nielsen, entitled “The Cross-Platform Report;” RightScale^® Inc., entitled

“State of the Cloud Report;” Sandvine, entitled “Global Internet Phenomena Report” (available at www.sandvine.com/trends/global-internet-phenomena); and Vertical Systems Group’s ENS (Emerging Networks Service) Research. We obtained this market data from independent industry publications or other publicly available information. Industry surveys, publications, consultant surveys, and forecasts generally state that the information contained therein has been obtained from sources believed to be reliable, but completeness of such information is not guaranteed. We take responsibility for compiling and extracting, but we have not ascertained the underlying economic assumptions relied upon therein. Forecasts are particularly likely to be inaccurate, especially over long periods of time. While we are not aware of any misstatements regarding market data, industry data, and forecasts presented herein, estimates in such information involve risks and uncertainties and are subject to change based on various factors, including those discussed under “Risk Factors” in this prospectus.

The Gartner Report described herein (the “Gartner Report”) represents data, research opinion or viewpoints published as part of a syndicated subscription service by Gartner, Inc. (“Gartner”), and are not representations of fact. The Gartner Report speaks as of its original publication date (and not as of the date of this prospectus) and the opinions expressed in the Gartner Report are subject to change without notice. The Gartner Report consists of “Forecast: The Internet of Things, Worldwide, 2013” published November 18, 2013 by Peter Middleton, Peter Kjeldsen, and Jim Tully.

We have included certain financial measures in this prospectus that are not defined under generally accepted accounting principles in the United States, or GAAP, including Adjusted EBITDA, Adjusted EBITDA Margin, levered free cash flow, and annualized revenue and annualized Adjusted EBITDA.

Adjusted EBITDA is defined as earnings from continuing operations before interest, income taxes, depreciation, and amortization (“EBITDA”), adjusted to exclude acquisition or disposal-related transaction costs, losses on extinguishment of debt, stock-based compensation, unrealized foreign currency gains on an intercompany loan, and impairment of cost method investment. Adjusted EBITDA Margin is defined as Adjusted EBITDA divided by revenue. Levered free cash flow is defined as net cash flows provided by operating activities minus purchases of property and equipment, net of stimulus grant. These measures are not measurements of our financial performance under GAAP and should not be considered in isolation or as alternatives to net income, net cash flows provided by operating activities, total net cash flows or any other performance measures derived in accordance with GAAP or as alternatives to net cash flows from operating activities or total net cash flows as measures of our liquidity.

We use Adjusted EBITDA to evaluate our operating performance and liquidity, and we use levered free cash flow as a measure to evaluate cash generated through normal operating activities. These metrics are among the primary measures used by management for planning and forecasting future periods. We believe the presentation of Adjusted EBITDA is relevant and useful for investors because it allows investors to view results in a manner similar to the method used by management and make it easier to compare our results with the results of other companies that have different financing and capital structures. We believe that the presentation of levered free cash flow is relevant and useful to investors because it provides a measure of cash available to pay the principal on our debt and pursue acquisitions of businesses or other strategic investments or uses of capital.

We also monitor Adjusted EBITDA because our subsidiaries have debt covenants that restrict their borrowing capacity that are based on a leverage ratio, which utilizes a modified EBITDA, as defined in our credit agreement and the indentures governing our notes. The modified EBITDA is consistent with our definition of Adjusted EBITDA; however, it includes the pro forma Adjusted EBITDA of and expected cost synergies from the companies acquired by us during the quarter for which the debt compliance certification is due. Adjusted EBITDA results, along with the quantitative and qualitative information, are also utilized by management and our Compensation Committee for purposes of determining bonus payments to employees.

Adjusted EBITDA has limitations as an analytical tool and should not be considered in isolation from, or as a substitute for, analysis of our results of operations and operating cash flows as reported under GAAP. For example, Adjusted EBITDA:

Levered free cash flow has limitations as an analytical tool and should not be considered in isolation from, or as a substitute for, analysis of our results as reported under GAAP. For example, while it does include cash interest, levered free cash flow:

Our computation of Adjusted EBITDA and levered free cash flow may not be comparable to other similarly titled measures computed by other companies because all companies do not calculate these measures in the same fashion.

Because we have acquired numerous entities since our inception and incurred transaction costs in connection with each acquisition, borrowed money in order to finance our operations and acquisitions, and used capital and intangible assets in our business, and because the payment of income taxes is necessary if we generate taxable income after the utilization of our net operating loss carryforwards, any measure that excludes these items has material limitations. As a result of these limitations, these measures should not be considered as a measure of discretionary cash available to us to invest in the growth of our business or as a measure of our liquidity. See “Summary Consolidated Financial Information and Other Data” for a quantitative reconciliation of Adjusted EBITDA to net income/(loss) and for a quantitative reconciliation of levered free cash flow to net cash flows provided by operating activities.

Annualized revenue and annualized Adjusted EBITDA are derived by multiplying the total revenue and Adjusted EBITDA, respectively, for the most recent quarterly period by four. Our computations of annualized revenue and annualized Adjusted EBITDA may not be representative of our actual annual results.

PROSPECTUS SUMMARY

This summary highlights some of the information contained in this prospectus. This summary may not contain all of the information that may be important to you. For a more complete understanding of our business and this offering, we encourage you to read this entire prospectus, including “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” the more detailed information regarding our Company and the common stock being sold in this offering, as well as our consolidated financial statements and the related notes appearing elsewhere in this prospectus, before deciding to invest in our common stock. Some of the statements in this prospectus constitute forward-looking statements. See “Forward-Looking Statements.”

A chart summarizing our corporate structure is on page 8 of this prospectus. Prior to the Restructuring (as described below under “—Restructuring”) and the consummation of this offering, Zayo Group Holdings, Inc. was a direct, wholly owned subsidiary of Communications Infrastructure Investments, LLC (“CII”). Unless the context otherwise requires, “we,” “us,” “our” and the “Company” refers to Zayo Group Holdings, Inc. and its consolidated subsidiaries, including Zayo Group, LLC (“ZGL”).

Our industry uses many terms and acronyms that may not be familiar to you. To assist you in reading this prospectus, we have provided definitions of some of these terms in the “Glossary of Terms” beginning on page G-1 of this prospectus.

OVERVIEW

We are a large and fast growing provider of bandwidth infrastructure in the United States and Europe. Our products and services enable mission-critical, high-bandwidth applications, such as cloud-based computing, video, mobile, social media, machine-to-machine connectivity, and other bandwidth-intensive applications. Key products include leased dark fiber, fiber to cellular towers and small cell sites, dedicated wavelength connections, Ethernet and IP connectivity and other high-bandwidth offerings. We provide our services over a unique set of dense metro, regional, and long-haul fiber networks and through our interconnect-oriented datacenter facilities. Our fiber networks and datacenter facilities are critical components of the overall physical network architecture of the Internet and private networks. Our customer base includes some of the largest and most sophisticated consumers of bandwidth infrastructure services, such as wireless service providers; telecommunications service providers; financial services companies; social networking, media, and web content companies; education, research, and healthcare institutions; and governmental agencies. We typically provide our bandwidth infrastructure services for a fixed monthly recurring fee under contracts that vary between one and twenty years in length. As of June 30, 2014, we had more than $4.6 billion in revenue under contract with a weighted average remaining contract term of approximately 43 months. We operate our business with a unique focus on capital allocation and financial performance with the ultimate goal of maximizing equity value for our stockholders. Our core values center on partnership, alignment, and transparency with our three primary constituent groups—employees, customers, and stockholders. For the years ended June 30, 2012, 2013, and 2014, we generated revenue of $376 million, $1,004 million, and $1,123 million, Adjusted EBITDA of $188 million, $554 million, and $654 million and a net loss of $1 million, $137 million, and $179 million, respectively. For the quarter ended June 30, 2014, we generated annualized revenue of $1,187 million and annualized Adjusted EBITDA of $684 million. See “Non-GAAP Financial Measures” and “Summary Consolidated Financial Information and Other Data” for a reconciliation of Adjusted EBITDA to net income (loss).

traffic will grow at an annual rate of 21% through 2018. Additionally, according to Gartner in its November 18, 2013 report, Forecast: The Internet of Things, Worldwide, 2013, “[t]he installed base of ‘things,’ excluding PCs, tablets and smartphones, will grow to 26 billion units in 2020, which is almost a 30-fold increase from 0.9 billion units in 2009.” As an early believer in the enduring nature of these trends, we assembled our asset base and built a business model specifically to provide high-bandwidth connectivity to customers whose businesses depend most on the continuous and growing demand for bandwidth. As a core tenet of our strategy for capitalizing on these industry trends, we have been a leading consolidator in the industry and have acquired 32 bandwidth infrastructure businesses and assets to date. Our owned, secure, and redundant fiber network and datacenters serve as the foundation for our bandwidth solutions and allow us to offer customers both physical infrastructure and lit services. We believe the continuous demand for additional bandwidth from service providers, enterprises and consumers, combined with our unique and dense metro, regional, and long-haul networks, position us as a mission-critical infrastructure supplier to the largest users of bandwidth.

Our network footprint includes both large and small metro geographies, the extended suburban regions of many cities, and the large rural, national and international links that connect our metro networks. We believe that our network assets would be difficult to replicate given the geographic reach, network density, and capital investment required. Our fiber networks span over 81,000 route miles and 6,000,000 fiber miles (representing an average of 74 fibers per route), serve 319 geographic markets in the United States and Europe, and connect to over 15,700 buildings, including 4,200 cellular towers and 756 datacenters. We own fiber networks in over 300 metro markets, including large metro areas, such as New York, Chicago, San Francisco, Paris, and London, as well as smaller metro areas, such as Allentown, Pennsylvania, Fargo, North Dakota, and Spokane, Washington. Our networks allow us to provide our high-bandwidth infrastructure services to our customers over redundant fiber facilities between key customer locations. We own approximately 94% of our fiber miles, the remainder of which are operated by us under long-term IRU contracts with an average remaining contract term of over 9 years. We believe our ownership and the location and density of our expansive network footprint allow us to more competitively service our target customers’ bandwidth infrastructure needs at the local, regional, national, and international level relative to other regional bandwidth infrastructure service providers or long-haul carriers. We also provide our network-neutral colocation and interconnection services utilizing our own datacenters located within major carrier hotels and other strategic buildings in 37 locations throughout the United States and France and operate more than 265,000 square feet of billable colocation space.

The density and geographic reach of our network footprint allow us to provide tailored bandwidth infrastructure solutions on our own network (“on-net”) that address the current and future bandwidth needs of our customers. Our dense metro and regional networks have high fiber counts that enable us to provide both our physical infrastructure services (e.g., dark fiber) and our lit services (e.g., wavelengths and Ethernet). Our networks are deep and scalable, meaning we have spare fiber, conduit access rights and/or rights of way that allow us to continue to add capacity to our network as our existing and new customers’ demand for our services increases. In addition, many of our core network technologies provide capacity through which we can continue to add wavelengths to our network without consuming additional fiber. We also believe the density and diversity of our networks provide a strong and growing competitive barrier to protect our existing revenue base. We believe our networks provide significant opportunity to organically connect to new customer locations, datacenters, towers, or small cell locations to help us achieve an attractive return on our capital deployed. Since our founding, we have assembled a large portfolio of fiber networks and colocation assets through both acquisitions and customer demand-driven investments in property and equipment. From our inception to date, we have completed acquisitions with an aggregate purchase consideration, net of cash acquired, totaling approximately $3.9 billion. For the period from July 1, 2012 through June 30, 2014, we also invested an additional $693 million in capital expenditures, exclusive of acquisitions and stimulus grant reimbursements, primarily to expand the reach and capacity of our networks. As of June 30, 2014, our total debt (including capital lease obligations) was $3,265 million and was primarily incurred in connection with acquisitions.

Our business model focuses on providing on-net bandwidth infrastructure solutions to our customers, which results in what we refer to as “infrastructure economics.” Infrastructure economics are characterized by attractive revenue visibility, strong Adjusted EBITDA margins coupled with operating leverage for new revenue, success-based capital investments with low maintenance capital needs, and the ability to generate significant cash flow over time. For the year ended June 30, 2014, approximately 97% of our revenue was recurring in nature with a weighted average remaining contract term of approximately 43 months. Our Adjusted EBITDA margin for the year ended June 30, 2014 was 58% due to our infrastructure-based, on-net strategy. Additionally, our Adjusted EBITDA margin on incremental revenue is approximately 70%, highlighting the operating leverage we achieve through our asset base and on-net focus. See “Non-GAAP Financial Measures.” Our capital expenditure investments are predominantly success-based, meaning that before we commit resources to expand our network, we have a signed customer contract that will provide us with an attractive return on the required capital. For the year ended June 30, 2014, 77% of our total capital expenditures of $361 million were success-based, with customers providing up-front cash payments of $164 million, largely used to finance our network expansion. After committing capital to connect additional customer sites, our goal is to sell additional high-bandwidth connectivity on these new routes at a relatively low incremental cost, which further enhances the return we extract from our asset base. Finally, the combination of our scale and infrastructure economics results in the ability to generate meaningful free cash flow over time. For the year ended June 30, 2014, we generated $206 million of levered free cash flow. See “Non-GAAP Financial Measures” and “Summary Consolidated Financial Information and Other Data” for a reconciliation of levered free cash flow to net cash flows provided by operating activities.

Our management is intensely focused on creating equity value for our stockholders. Our equity value creation philosophy includes regular and rigorous financial and operational measurement, financial transparency (both internally and externally), and clear alignment of interests among employees, management, and stockholders. Our real-time measurement and reporting system serves as the foundation for our decision making and our extensive financial and operational disclosure. We also believe in fostering an entrepreneurial culture that aligns the interests of our employees, management, and stockholders. Following this offering, our management and employees are expected to own 8.9% of our shares. Additionally, following our initial public offering, most employees are expected to have a significant portion of their performance-based compensation paid in restricted stock units that will be tied directly to the level of equity value created.

OUR COMPANY

We provide high-bandwidth infrastructure services over our extensive metro, regional, and long-haul fiber networks and through our interconnect-oriented datacenter facilities. We focus on customers who are very large consumers of bandwidth, including wireless and wireline carriers, media companies, Internet companies, governments, and very large enterprises. We provide two major types of products and services, which form the basis for our primary operating segments: Physical Infrastructure and Lit Services. Across our Physical Infrastructure and Lit Services units, we operate seven individual Strategic Product Groups (“SPGs”). Each SPG has financial accountability and decision-making authority, which promotes agility in the fast-moving markets we serve.

Physical Infrastructure. Through our Physical Infrastructure segment, we provide raw bandwidth infrastructure to customers that require more control of their internal networks. These services include dark fiber, mobile infrastructure (fiber-to-the-tower and small cell), and colocation and interconnection. Dark fiber is a physically separate and secure, private platform for dedicated bandwidth. We lease dark fiber pairs (usually two to 12 total fibers) to our customers, who “light” the fiber using their own optronics. Our mobile infrastructure services provide direct fiber connections to cell towers, small cells, hub sites, and mobile switching centers. Our datacenters offer colocation and interconnection services to our customers, who then house and power computing

and networking equipment for the purpose of aggregating and distributing data, voice, Internet, and video traffic. The contract terms in our Physical Infrastructure segment generally range from three to twenty years.

Lit Services. Our Lit Services segment provides bandwidth infrastructure solutions over our metro, regional, and long-haul fiber networks where we use optronics to light the fiber and our customers pay us for access based on the amount and type of bandwidth they purchase. Our lit services include wavelength, Ethernet, IP, and SONET services. We target customers who require a minimum of 10G of bandwidth across their networks. The contract terms in this segment typically range from two to five years.

We also have an Other segment currently comprised of our eighth SPG, Zayo Professional Services (“ZPS”). ZPS is our professional services business that provides network management and technical resources to our customers.

Our sales force of 127 quota bearing representatives serves each of our primary operating segments and is organized by customer. Our average sales representative generated approximately $16,000 of new monthly recurring revenue per month during the quarter ended June 30, 2014. Our sales force compensation includes both a base salary and a commission component. The commission plan is based on the net present value (“NPV”) of the total contract value sold less the required capital and certain operating expenses, which we believe aligns our sales force with the corporate objective of maximizing equity value created. We have recently launched a new on-line portal, “Tranzact,” which is designed to provide our sales people and customers the opportunity to evaluate and purchase bandwidth infrastructure services on demand using an integrated platform.

We utilize an integrated, custom-built cloud-based operating and reporting platform that is used universally across our Company. This system provides management the ability to monitor business activities, including quoting new business, order processing, installation planning, billing, and customer service. We believe our customized platform provides us a competitive advantage as it enables us to identify emerging trends in our business, constantly monitor the underlying economics of our contracts and capital plan, and provide our customers with commercial solutions and high-quality, responsive customer service. Each of the companies we acquire is rapidly integrated into our customized platform, which improves efficiency and helps drive the realization of cost synergies.

OUR MISSION, VISION & VALUES

Our mission is to accelerate our customers’ capabilities to enrich, entertain, teach, protect, and inspire the people of the world by providing enormous bandwidth and connectivity over our exceptional network infrastructure.

Our vision is to amass fundamentally valuable fiber, datacenter, and structure assets and unleash their full value by providing thoughtful and innovative bandwidth infrastructure services.

Our values are to:

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Embrace colleagues

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Enamor customers

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Delight investors

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Leapfrog rivals

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Pursue innovation

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Own outcomes

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Impact world

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Enjoy journey

OUR BUSINESS STRATEGY

In pursuit of our mission, our Business Strategy includes the following key elements:

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Focus on Bandwidth Infrastructure. We expect that bandwidth needs for mobile applications, cloud-based computing, and machine-to-machine connectivity will continue to grow with the continued adoption of bandwidth-intensive devices, as well as the escalating demand for Internet-delivered video. We focus on providing high-bandwidth infrastructure solutions, which we believe are essential in the consumption and delivery of bandwidth-intensive applications and services by enterprise customers and communications service providers. We believe our disciplined approach to providing these critical services to our targeted customers enables us to offer a high level of customer service, while at the same time being responsive to changes in the marketplace.

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Target Large Consumers of Bandwidth. Our asset base and product suite are geared for large consumers of bandwidth with high connectivity requirements. The majority of our customers require more than 10G of bandwidth; many of our customers require multiple terabytes of bandwidth. Our revenue base is generally characterized by customers with a high bandwidth spend, consisting of a large number of individual services and increasing bandwidth infrastructure service demand. Tailoring our operations around these products, services and customers allows us to operate efficiently and meet these large consumers’ requirements for mission-critical infrastructure.

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Leverage Our Extensive Asset Base by Selling Services on Our Network. Targeting our sales efforts on services that utilize our existing fiber networks and datacenters enables us to limit our reliance on third-party service providers. We believe this in turn produces high incremental margins, which helps us expand consolidated margins, achieve attractive returns on the capital we invest, and realize significant levered free cash flow. We also believe this enables us to provide our customers with a superior level of customer service due to the relative ease in responding to customer service inquiries over one contiguous fiber network. Our existing networks enable us to sell additional bandwidth to our existing customers as their capacity needs grow.

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Continue to Expand Our Infrastructure Assets. Our ability to rapidly add network capacity to meet the growing requirements of our customers is an important component of our value proposition. We will continue to seek opportunities to expand our network footprint where supporting customer contracts provide an attractive return on our investment. The expansion of our network footprint also provides the ancillary benefit of bringing other potential customer locations within reach. We design our networks with additional capacity so that increasing bandwidth capacity can be deployed economically and efficiently. A significant portion of our capital expenditures are success-based.

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Leverage Our Existing Relationships and Assets to Innovate. We believe we possess a unique set of assets and management systems designed to deliver customer solutions tailored to specific trends we observe in the marketplace. Our high-energy, entrepreneurial culture fosters employee innovation on an ongoing basis in response to specific customer requirements. Furthermore, we plan to continue to commit capital to new lines of infrastructure businesses that leverage our existing assets. For example, we are expanding into small cell infrastructure services provided to wireless services providers. These services entail us providing dark fiber and related services from a small cell location back to a mobile switching center. We provide the fiber-based transport over our existing and/or newly constructed fiber networks. In addition, we provide network-neutral space and power for wireless service providers to co-locate their small cell antennas and ancillary equipment.

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Intelligently Expand Through Acquisitions. We have made 32 acquisitions to date for an aggregate purchase consideration, net of cash, of $3.9 billion, and associated with these acquisitions, we have acquired approximately $400 million of Adjusted EBITDA based on the quarter prior to each acquisition’s close annualized. See “Business—Business Strategy” for an explanation of acquired Adjusted EBITDA. We believe we have consistently demonstrated an ability to acquire and effectively integrate companies, realize cost synergies, and organically grow revenue and Adjusted EBITDA post-acquisition. Acquisitions have the ability to increase the scale of our operations, which in turn affords us the ability to expand our operating leverage, extend our network reach, and broaden our customer base. To date, we have identified, planned, and realized cost synergies representing approximately $126 million in annual recurring cost savings and have identified and planned, although not yet realized, an additional approximately $33 million in annual recurring cost savings. To achieve the remaining unrealized cost synergies, we expect to incur one-time costs of approximately $5 million, comprised of severance expense, and capital expenditures and early termination fees related to eliminating third party network expense. We believe our ability to realize significant cost synergies through acquisitions provides us with a competitive advantage in future consolidation opportunities within our industry. See “Business—Business Strategy” for an explanation of planned cost synergies. We will continue to evaluate potential acquisition opportunities and are regularly involved in acquisition discussions. We will evaluate these opportunities based on a number of criteria, including the quality of the infrastructure assets, the fit within our existing businesses, the opportunity to expand our network, and the opportunity to create value through the realization of cost synergies.

OUR COMPETITIVE STRENGTHS

We believe the following are among our core competitive strengths and enable us to differentiate ourselves in the markets we serve:

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Unique Bandwidth Infrastructure Assets. We believe replicating our extensive metro, regional, and long-haul fiber assets would be difficult given the significant capital, time, permitting, and expertise required. Our fiber networks span over 81,000 route miles and 6,000,000 fiber miles (representing an average of 74 fibers per route), serve 319 geographic markets in the United States and Europe, and connect to 15,764 buildings. The majority of the markets that we serve and buildings to which we connect have few other networks capable of providing similar high-bandwidth infrastructure and connectivity solutions, which we believe provides us with a sustainable competitive advantage in these markets, and positions us as a mission-critical infrastructure supplier to the largest users of bandwidth. We believe that the vast majority of customers using our network, including our lit bandwidth, fiber-to-the-tower, and dark fiber customers, choose our services due to the quality and reach of our network, and the ability our network gives us to innovate and scale with their growing bandwidth needs. Additionally, we operate 37 datacenter facilities, which are located in eight of the most important carrier hotels in the U.S. and France. This collective presence, combined with our high network density, creates a network effect that helps us retain existing customers and attract new customers. We believe the uniqueness of our network and our focus on investment in infrastructure assets provides us with the ability to enhance our high Adjusted EBITDA margin profile. From July 1, 2012 through June 30, 2014, exclusive of acquisitions and stimulus grant reimbursements, we have invested $693 million of capital in our networks, including expansion and maintenance expenditures.

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Strong Revenue Growth, Visibility, and Durability. We have consistently grown our organic revenue, as gross installed revenue has exceeded churn processed in every quarter since we began reporting in March 2010. We believe our exposure to the enduring trend of increasing bandwidth consumption combined with our focused execution have allowed us to achieve this consistent growth. We typically provide our bandwidth infrastructure services for a fixed monthly recurring fee under multi-year contracts. Our contract terms range from one year to twenty years with a weighted average contract term of approximately

79 months for contracts entered into during the twelve months ended June 30, 2014. As of June 30, 2014, we had more than $4.6 billion in revenue under contract with a weighted average remaining contract life of approximately 43 months. Our customers use our bandwidth infrastructure to support their mission-critical networks and applications. The costs and effort required to replace our services can be high, particularly for the services within our Physical Infrastructure segment, given the criticality of our services and the potential cost and disruption. We believe that increasing bandwidth needs combined with the mission-critical nature of our services provided under multi-year contracts create strong revenue growth, visibility, and durability, which support our decision-making abilities and financial stability.

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Customer Service and Ability to Innovate for Our Customers. Our sales and product professionals work closely with potential and existing customers to design tailored high-bandwidth connectivity solutions across our eight Strategic Product Groups to meet specific, varying, and evolving customer needs. We are focused on delivering high-quality, reliable service to our customers. We achieve this by leveraging our contiguous network to expand with our customers as they seek to build scale, coverage, and/or performance. Additionally, our focus on serving the largest and most sophisticated users of bandwidth keeps our sales, engineering, and service organizations attuned to the latest technologies, architectures, and solutions that our customers may seek to implement. We believe our willingness to innovate for our customers and our dedication to customer service help establish our position as an important infrastructure supplier and allow us to attract new customers and businesses, sell an increasing amount of services to our existing customers, and reduce customer turnover. From July 1, 2013 through June 30, 2014, existing customers accounted for over 85% of newly installed monthly recurring revenue.

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Strategic, Operational and Financial Transparency Excellence. As part of our strategy to serve the largest users of bandwidth, we have completed and integrated 32 acquisitions to date. Our acquired assets have been combined to create a contiguous network with the ability to provision and maintain local, regional, national, or international high-bandwidth connections across our eight Strategic Product Groups. Our entire network, sales and churn activity, installation pipeline, NPV commission plans, and all customer contracts are managed through an integrated operating and reporting platform, which gives management strong visibility into the business and improves our ability to drive return-maximizing decisions throughout the organization. We believe this approach creates efficiency, as evidenced by our identified, planned, and realized cost synergies, representing approximately $126 million in annual recurring cost savings, and our identified and planned, although not yet realized, annual recurring cost savings of approximately $33 million, from our 32 acquisitions to date. We also believe this approach allows for the integration of additional network assets whether through new builds or acquisitions. Our focus on operational and financial transparency not only allows us to be very nimble in attacking various market opportunities, but also provides us the ability to deliver disclosure that our stockholders and other stakeholders can use to accurately judge management’s performance from a capital allocation, financial, and operational perspective.

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Financially Focused and Entrepreneurial Culture. Virtually all operational and financial decisions we make are driven by the standard of maximizing the value of our enterprise. Our sales commission plans use an NPV-based approach with the goal of encouraging the proper behavior within our sales force, and our eight Strategic Product Groups are held to group level equity internal rate of return (“IRR”) targets set by management. Additionally, to align individual behaviors with stockholder objectives, equity compensation is used throughout the Company, and our compensation plans include a larger equity component than we believe is standard in our industry. We expect that our employees will own 8.9% of our outstanding shares following this offering, which we believe is a significantly higher percentage than other public peers. In addition to striving for industry-leading operational and growth outcomes to drive value creation, we are prepared to use debt capacity to enhance stockholder returns, but not at the expense of other stakeholders and

only at levels we believe are in the long-term interests of the Company, our customers, and our stockholders. Finally, our owners’ manual, mission, and investor transparency all serve to enhance cultural alignment across the Company and our stockholders.

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Experienced Management with Unique Leadership Approach. We have assembled an experienced management team that we believe is well-qualified to lead our company and execute our strategy. Our management team has substantial industry experience in managing and designing fiber networks and network-neutral colocation and interconnection facilities and in selling and marketing bandwidth infrastructure services. In addition, our management team has significant experience in acquiring and integrating bandwidth infrastructure and assets. Our management team is a cohesive unit with a common history that in many cases precedes the Company’s founding. We also believe that our approach to leadership—operationally, financially, and culturally—is unique in our industry and differentiates us from our competitors.

RESTRUCTURING

The Company is currently wholly-owned by CII, which is owned by a number of private equity investors and individuals who are our current or former employees. Prior to this offering, we will engage in a reorganization involving CII as a result of which 206,637,058 shares of our common stock (after giving effect to a 223,000:1 stock split) will be distributed to the members of CII in accordance with their distribution rights under the existing operating agreement of CII, and 16,362,942 shares of our common stock will be retained to be subsequently distributed to the members of CII following resolution of contingent distributions among the members of CII and upon the vesting of unvested CII common units. It is expected that after the consummation of this offering, CII will own approximately 7.0% of our outstanding common stock, which will be distributed to the unitholders of CII subsequent to this offering as described above. We refer to these transactions as our “Restructuring.” It is expected that after the consummation of this offering, our private equity investors will own, in the aggregate, approximately 70.4% of our outstanding common stock, and current and former employees will own, in the aggregate, approximately 10.2% of our outstanding common stock.

CORPORATE INFORMATION

Our principal executive office is located at 1805 29th Street, Suite 2050, Boulder, Colorado 80301. Our telephone number at that address is (303) 381-4683. Our website address is www.zayo.com. Information on our website is deemed not to be a part of this prospectus.

A simplified summary of our corporate structure following this offering appears below.

LOGO

We are a Delaware corporation formed in 2007, and as of June 30, 2014, we had 1,513 employees. Our fiscal year ends June 30 each year, and we refer to the fiscal year ended June 30, 2014 as “Fiscal 2014,” the fiscal year ended June 30, 2013 as “Fiscal 2013,” the fiscal year ended June 30, 2012 as “Fiscal 2012”.

RISKS TO CONSIDER

We are subject to a number of risks, including risks that may prevent us from achieving our business objectives or that may adversely affect our business, financial condition, results of operations, cash flows, and prospects. You should carefully consider the following risks, including the risks discussed in the section entitled “Risk Factors,” before investing in our common stock:

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We have consistently generated net losses since our inception and expect such losses to continue for at least several years.

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Since our inception, we have used more cash than we have generated from operations, and we may continue to do so.

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We are highly dependent on our management team and other key employees, many of whom own equity that has been illiquid but will become liquid as a result of this offering.

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Our revenue is relatively concentrated among a small number of customers, and the loss of any of these customers could significantly harm our business, financial condition, results of operations, and cash flows.

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Future acquisitions are a component of our strategic plan, and will include integration and other risks that could harm our business.

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We are growing rapidly and may not maintain or efficiently manage our growth.

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Any failure of our physical infrastructure or services could lead to significant costs and disruptions.

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We use franchises, licenses, permits, rights-of-way, conduit leases, fiber agreements, and property leases, which could be canceled or not renewed.

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We are required to maintain, repair, upgrade, and replace our network and our facilities, the cost of which could materially impact our results and our failure to do so could irreparably harm our business.

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Our debt level could negatively impact our financial condition, results of operations, cash flows, and business prospects and could prevent us from fulfilling our obligations under our outstanding indebtedness. In the future, we may incur substantially more indebtedness, which could further increase the risks associated with our leverage.

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Our debt agreements contain restrictions on our ability to operate our business and to pursue our business strategies, and our failure to comply with these covenants could result in an acceleration of our indebtedness.

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Our future tax liabilities are not predictable or controllable. If we become subject to increased levels of taxation, our financial condition and operations could be negatively impacted.

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The international operations of our business expose us to risks that could materially and adversely affect the business.

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We may be vulnerable to security breaches that could disrupt our operations and adversely affect our business and operations.

THE OFFERING

Total common stock offered

28,900,000 shares

Common stock offered by us

11,100,000 shares

Common stock offered by the selling stockholders

17,800,000 shares

Option to purchase additional shares

4,335,000 shares

Common stock to be outstanding immediately after this offering

234,100,000 shares

Use of proceeds

We estimate that the net proceeds to us from this offering, after deducting the underwriting discount and estimated offering expenses payable by us, will be approximately $232.5 million, assuming the shares are offered at $22.50 per share (the midpoint of the estimated price range set forth on the cover of this prospectus).

We will not receive any proceeds from the sale of shares by the selling stockholders.

We intend to use the net proceeds from the sale of common stock by us in this offering for general corporate purposes, which may include redemption of up to 35% of our outstanding 10.125% senior unsecured notes due 2020 at a redemption price of 110.125% and 8.125% senior secured notes due 2020 at a redemption price of 108.125%, plus, in each case, accrued and unpaid interest, if any, to the redemption date; acquisitions; working capital; and capital expenditures. Although we are always evaluating attractive bandwidth infrastructure acquisitions, we have not at this time identified any acquisition candidate for which we intend to use a portion of the proceeds of this offering. Our actual use of proceeds will depend on, among other things, market conditions. See “Use of Proceeds.”

Principal stockholders

Following the Restructuring and the completion of this offering, our five largest stockholders are expected to be: investment funds affiliated with GTCR LLC (“GTCR”), which will beneficially own approximately 45,143,077 shares, or 19.3%, of our outstanding common stock, Oak Investment Partners XII, Limited Partnership (“Oak Investment Partners”), which will beneficially own approximately 24,180,289 shares, or 10.3%, of our outstanding common stock, M/C Partners, which will beneficially own approximately 22,360,168 shares, or 9.6%, of our outstanding common stock, Columbia Capital, which will beneficially own approximately 22,360,166 shares, or 9.6%, of our outstanding common stock, and Charlesbank Capital Partners (“Charlesbank”), which will beneficially own approximately 21,521,718 shares, or 9.2%, of our outstanding common stock.

None of our principal or other selling stockholders will receive any other fees in connection with this offering.

Dividend policy

We currently intend to retain all available funds and any future earnings for use in the operation of our business, and therefore we do not anticipate paying any cash dividends in the foreseeable future. Any future determination to pay dividends will be at the discretion of our board of directors and will depend upon our financial condition, results of operations, cash flows, capital requirements, and other factors that our board of directors deems relevant. We are a holding company, and substantially all of our operations are carried out by our subsidiary, ZGL, and its subsidiaries. ZGL’s ability to pay dividends to us is limited by its credit agreement and the indentures governing its outstanding notes, which may in turn limit our ability to pay dividends on our common stock. Our ability to pay dividends may also be restricted by the terms of any future credit agreement or any future debt or preferred securities of ours or of our subsidiaries. See “Dividend Policy.”

Risk factors

Investing in our common stock involves a high degree of risk. See “Risk Factors” beginning on page 16 of this prospectus for a discussion of factors you should carefully consider before deciding to invest in our common stock.

Proposed symbol for trading on the New York Stock Exchange

ZAYO

Unless otherwise indicated, all information in this prospectus relating to the number of shares of our common stock to be outstanding immediately after this offering:

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excludes 14,000,000 shares reserved for future grants under our equity compensation plans;

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assumes an initial public offering price of $22.50 per share (the midpoint of the estimated price range set forth on the cover of this prospectus); and

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assumes no exercise by the underwriters of their option to purchase up to 4,335,000 additional shares from the selling stockholders.

SUMMARY CONSOLIDATED FINANCIAL INFORMATION AND OTHER DATA

The following table summarizes our historical consolidated financial information for the periods and as of the dates indicated. The summary historical consolidated financial information as of June 30, 2013 and 2014 and for the years ended June 30, 2012, 2013 and 2014 is derived from, and qualified by reference to, our audited consolidated financial statements included elsewhere in this prospectus. The summary historical consolidated financial information as of June 30, 2012 is derived from our audited consolidated financial statements not included in this prospectus.

The financial data set forth in the following tables should be read in conjunction with our historical consolidated financial statements and related notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” each included elsewhere in this prospectus. The results for any interim period are not necessarily indicative of the results that may be expected for a full year or any future period.


	Year Ended June 30,
	2012			2013			2014
Consolidated Statements of Operations Data (in thousands):
Revenue	$	375,526		$	1,004,354		$	1,123,187
Operating costs and expenses		305,707			894,781			1,067,161

Operating income		69,819			109,573			56,026
Other expenses, net		(52,845	)		(279,391	)		(200,375	)

Earnings/(loss) from continuing operations before income taxes		16,974			(169,818	)		(144,349	)
Provision/(benefit) for income taxes		26,871			(24,205	)		37,295

Loss from continuing operations		(9,897	)		(145,613	)		(181,644	)
Earnings from discontinued operations, net of income taxes		8,673			8,396			2,350

Net loss	$	(1,224	)	$	(137,217	)	$	(179,294	)

Consolidated Balance Sheet Data (at period end) (in thousands):
Cash and cash equivalents	$	150,693		$	91,313		$	297,423
Property and equipment, net		754,738			2,437,707			2,808,314
Total assets		1,442,055			4,251,240			5,049,066
Long-term debt and capital lease obligations, including current portion		701,339			2,843,872			3,265,394
Total stockholder’s equity		410,314			606,253			416,385

Selected cash flow data (in thousands):
Net cash flows provided by operating activities from continuing operations	$	167,630		$	404,883		$	566,484

Purchases of property and equipment, net of stimulus grants(1)	$	(124,137	)	$	(323,232	)	$	(360,757	)
Acquisitions	$	(351,273	)	$	(2,480,738	)	$	(393,341	)
Net cash flows used in investing activities from continuing operations	$	(475,410	)	$	(2,803,970	)	$	(754,098	)
Net cash flows provided by financing activities from continuing operations	$	433,079		$	2,340,029		$	392,711


	Year Ended June 30,
	2012			2013			2014

Other Financial Data and Operating Data:
Adjusted EBITDA (in thousands)(2)	$	187,786		$	554,429		$	653,610
Levered free cash flow (in thousands)(3)							$	205,727
Customers		1,292			4,087			4,851
Total revenue under contract ($ in millions)(4)	$	1,874		$	3,522		$	4,667
Weighted average remaining contract term (in months)(5)		46			37			43
Route miles(6)		46,504			75,839			80,860
Fiber miles(7)		2,054,118			5,442,780			5,973,509
On-net buildings(8)		6,055			12,222			15,168

Reconciliation of Adjusted EBITDA:
Net loss	$	(1,224	)	$	(137,217	)	$	(179,294	)
Earnings from discontinued operations, net of income taxes		8,673			8,396			2,350

Net loss from continuing operations		(9,897	)		(145,613	)		(181,644	)
Add back non-adjusted EBITDA items included in loss from continuing operations:
Depreciation and amortization		84,961			324,532			338,268
Interest expense		50,720			202,464			203,529
Provision/(benefit) for income taxes		26,871			(24,205	)		37,295
Stock-based compensation		26,253			105,849			253,681
Loss on extinguishment of debt		—			77,253			1,911
Impairment of cost method investment		2,248			—			—
Unrealized foreign currency gains(9)		—			(55	)		(4,725	)
Transaction costs(10)		6,630			14,204			5,295

Adjusted EBITDA	$	187,786		$	554,429		$	653,610

Reconciliation of Levered Free Cash Flow (in thousands):
Net cash flows provided by operating activities from continuing operations							$	566,484
Purchase of property and equipment, net of stimulus grant								(360,757	)

Levered Free Cash Flow							$	205,727


Other Financial Data for Three Months ended June 30, 2014	Three Months Ended June 30, 2014
Reconciliation of Annualized Revenue (in thousands):
Revenue	$	296,767
Annualized Revenue(11)	$	1,187,068

Reconciliation of Adjusted EBITDA (in thousands):
Net loss	$	(73,500	)
Loss from discontinued operations, net of income taxes		(1,305	)

Net loss from continuing operations		(72,195	)
Add back non-adjusted EBITDA items included in loss from continuing operations:
Depreciation and amortization		91,337
Interest expense		52,608
Provision/(benefit) for income taxes		10,094
Stock-based compensation		88,545
Loss on extinguishment of debt		—
Impairment of cost method investment		—
Unrealized foreign currency translation gains(9)		(3,781	)
Transaction costs(10)		4,506

Adjusted EBITDA	$	171,114

Annualized Adjusted EBITDA(12)	$	684,456

(1) See Note 2—Basis of Presentation and Significant Accounting Policies—p. Government Grants to our audited consolidated financial statements for an explanation of our stimulus grants.

(2) Adjusted EBITDA is not a financial measurement prepared in accordance with GAAP. We define Adjusted EBITDA as earnings from continuing operations before interest, income taxes, depreciation and amortization (“EBITDA”) adjusted to exclude acquisition or disposal-related transaction costs, losses on extinguishment of debt, stock-based compensation, unrealized foreign currency gains on an intercompany loan, and impairment of cost method investment. See “Non-GAAP Financial Measures.” The table above sets forth, for the periods indicated, a reconciliation of net loss to Adjusted EBITDA, as net loss is calculated in accordance with GAAP.

(3) Levered free cash flow is not a financial measurement prepared in accordance with GAAP. We define levered free cash flow as net cash flows provided by operating activities from continuing operations minus purchases of property and equipment, net of stimulus grants received. See “Non-GAAP Financial Measures.” The table sets forth, for the periods indicated, a reconciliation of net cash flows provided by operating activities to levered free cash flow.

(4) Monthly recurring revenue (“MRR”) and monthly amortized revenue (“MAR”) under contract multiplied by the remaining contract term in months as of the reporting date, with a deemed maximum original contract term of twenty years.

(5) The weighted average remaining contract term is equal to revenue under contract divided by the sum of MRR and MAR on last day of quarter and MRR and MAR associated with cumulative gross new sales (bookings) that have not yet become gross installed revenue (have not been activated or installed), excluding intercompany sales.

(6) Route Miles including acquisitions closed after June 30, 2014 total 81,175.

(7) Fiber Miles including acquisitions closed after June 30, 2014 total 6,050,844.

(8) On-net buildings including acquisitions closed after June 30, 2014 total 15,764.

(9) Unrealized foreign currency gains result from the translation of intercompany loans to foreign subsidiaries denominated in U.S. dollars to British pounds, the functional currency of the subsidiaries.

(10) Transaction costs include expenses associated with professional services (i.e. legal, accounting, regulatory, etc.) rendered in connection with signed and/or closed acquisitions or disposals (including spin-offs), travel expense, severance expense incurred on the date of acquisition or disposal, and other direct expenses incurred that are associated with such acquisitions or disposals.

(11) Annualized Revenue is derived by multiplying Revenue for the quarter ended June 30, 2014 by four. See “Non-GAAP Financial Measures.”

(12) Annualized Adjusted EBITDA is derived by multiplying Adjusted EBITDA for the quarter ended June 30, 2014 by four. See “Non-GAAP Financial Measures.”

This offering and an investment in our common stock involve a high degree of risk. You should carefully consider the risks and uncertainties described below, together with the risks and uncertainties described elsewhere in this prospectus, including our consolidated financial statements and the related notes contained elsewhere in this prospectus, before you decide to purchase shares of our common stock. If any of the following risks or uncertainties actually occurs, our business, financial condition, results of operations, cash flow and prospects could be materially and adversely affected. As a result, the price of our common stock could decline and you could lose all or part of your investment in our common stock.

We have consistently generated net losses since our inception and expect such losses to continue for at least several years.

We have consistently generated net losses since our inception and expect such losses to continue for at least several years. These net losses primarily have been driven by significant depreciation, amortization, interest expense, and stock-based compensation. During the year ended June 30, 2014, we had depreciation and amortization expense of $338.3 million, stock-based compensation expense of $253.7 million, and interest expense of $203.5 million. At June 30, 2014, we had $3,265.4 million of total debt (including capital lease obligations). We cannot assure you that we will generate net income in the future.

Since our inception, we have used more cash than we have generated from operations, and we may continue to do so.

Since our inception, we have consistently consumed our entire positive cash flow generated from operating activities with our investing activities. Our investing activities have consisted principally of the acquisition of businesses as well as material additions to property and equipment. We have funded the excess of cash used in investing activities over cash provided by operating activities with proceeds from equity contributions and debt issuances.

We intend to continue to invest in expanding our fiber network and our business and pursuing acquisitions that we believe provide an attractive return on our capital. These investments may continue to exceed the amount of capital available from operations after debt service requirements. To the extent that our investments exceed our cash flow from operations, we plan to rely on potential future debt or equity issuances, which could increase interest expense or dilute your interest as a stockholder, as well as cash on hand and borrowings under our revolving credit facility. We cannot assure you, however, that we will be able to obtain or continue to have access to sufficient capital to successfully grow our business.

We are highly dependent on our management team and other key employees, many of whom own equity that has been illiquid but will become liquid as a result of this offering.

We expect that our continued success will largely depend upon the efforts and abilities of members of our management team and other key employees. Our success also depends upon our ability to identify, attract, develop, and retain qualified employees. None of the executive management team except for Mr. Caruso is bound by an employment agreement with us. If we lost members of our management team or other key employees, it would likely have a material adverse effect on our business.

All of our officers and many of our key management and employees have had a significant portion of their compensation paid in equity. Our employees, including members of our senior management, will offer a total of 2,402,031 shares for sale in this offering. While subject to the underwriters’ lock-up agreement and other restrictions on trading (including continued vesting), a substantial portion of management and employee equity will be vested at the time of this offering and is expected to become tradable after the expiration of the 180-day

lock-up agreement with the underwriters. This liquidity will in many cases represent material wealth of our officers and key management employees that may impact retention and focus of existing key employees.

Our largest single customer accounted for approximately 7% of our revenue during the year ended June 30, 2014, and total revenues from our top ten customers accounted for approximately 30% of our revenue during the year ended June 30, 2014. We currently depend, and expect to continue to depend, upon a relatively small number of customers for a significant percentage of our revenue. Many of these customers are also competitors for some or all of our service offerings. Our customer contracts typically have terms of one to twenty years. Our customers may elect not to renew these contracts. Furthermore, our customer contracts are terminable for cause if we breach a material provision of the contract. We may face increased competition and pricing pressure as our customer contracts become subject to renewal. Our customers may negotiate renewal of their contracts at lower rates, for fewer services or for shorter terms. Many of our customers are in the telecommunications industry, which is undergoing consolidation. To the extent that two or more of our customers combine, they may be able to use their greater size to negotiate lower prices from us and may purchase fewer services from us, especially if their networks overlap. If we are unable to successfully renew our customer contracts on commercially acceptable terms, or if our customer contracts are terminated, our business could suffer.

We are also subject to credit risk associated with the concentration of our accounts receivable from our key customers. If one or more of these customers were to become bankrupt, insolvent or otherwise were unable to pay for the services provided by us, we may incur significant write-offs of accounts receivable or incur impairment charges.

We have numerous customer orders for connections, including contracts with multiple national wireless carriers to build out additional towers. If we are unable to satisfy new orders or build our network according to contractually specified deadlines, we may incur penalties or suffer the loss of revenue.

Future acquisitions are a component of our strategic plan, and will include integration and other risks that could harm our business.

We intend to continue to acquire complementary businesses and assets, and some of these acquisitions may be large or in new geographic areas where we do not currently operate. This exposes us to the risk that when we evaluate a potential acquisition target we over-estimate the target’s value and, as a result, pay too much for it. We also cannot be certain that we will be able to successfully integrate acquired assets or the operations of the acquired entity with our existing operations. We may engage in large acquisitions, which could be much more difficult to integrate. Difficulties with integration could cause material customer disruption and dissatisfaction, which could in turn increase churn and reduce new sales. Additionally, we may not be able to integrate acquired businesses in a manner that permits us to realize the cost synergies we anticipate in the time, manner, or amount we currently expect, or at all. Our actual cost synergies, cost savings, growth opportunities, and efficiency and operational benefits resulting from any acquisition may be lower and may take longer to realize than we currently expect.

We may incur additional debt or issue additional equity to assist in the funding of these potential transactions, which may increase our leverage and/or dilute your interest as a stockholder. Further, additional transactions could cause disruption of our ongoing business and divert management’s attention from the management of daily operations to the closing and integration of the acquired business. Acquisitions also involve other operational and financial risks such as:

We are growing rapidly and may not maintain or efficiently manage our growth.

We have rapidly grown our company through acquisitions of companies and assets as well as expansion of our own network and the acquisition of new customers through our own sales efforts. We also intend to continue to grow our company, including through acquisitions, some of which may be large. Customers can be reluctant to switch providers of bandwidth services because it can involve substantial expense and technical difficulty. That can make it harder for us to acquire new customers through our own sales efforts. Our expansion may place strains on our management and our operational and financial infrastructure. Our ability to manage our growth will be particularly dependent upon our ability to:

Service level agreements in our customer agreements could subject us to liability or the loss of revenue.

Our contracts with customers typically contain service guarantees (including network availability) and service delivery date targets, which could enable customers to claim credits and, under certain conditions, terminate their agreements. Our inability to meet our service level guarantees could adversely affect our revenue. In Fiscal 2014, lost revenue from failure to meet service level guarantees was approximately $0.9 million. While we typically have carve-outs for force majeure events, many events, such as fiber cuts, equipment failure and third-party vendors being unable to meet their underlying commitments with us, could impact our ability to meet our service level agreements.

Any failure of our physical infrastructure or services could lead to significant costs and disruptions.

Our business depends on providing customers with highly reliable service. The services we provide are subject to failure resulting from numerous factors, including:

Problems within our network or our datacenters, whether within our control or the control of our landlords or other third-party providers, could result in service interruptions or equipment damage. In the past, we have experienced disruptions in our network attributed to equipment failure and power outages. Although such disruptions have been remedied and the network has been stabilized, there can be no assurance that similar disruptions will not occur in the future. Given the service level agreement obligations we typically have in our customer contracts, such disruptions could result in customer credits; however, we cannot assume that our customers will accept these credits as compensation in the future, and we may face additional liability.

We use franchises, licenses, permits, rights-of-way, conduit leases, fiber agreements, and property leases, which could be canceled or not renewed.

We must maintain rights-of-way, franchises, and other permits from railroads, utilities, state highway authorities, local governments, transit authorities, and others to operate our owned fiber network. We cannot be certain that we will be successful in maintaining these rights-of-way agreements or obtaining future agreements on acceptable terms. Some of these agreements are short-term or revocable at will, and we cannot assure you that we will continue to have access to existing rights-of-way after they have expired or terminated. If a material portion of these agreements are terminated or are not renewed, we might be forced to abandon our networks. In order to operate our networks, we must also maintain fiber leases and IRU agreements that we have with public and private entities. There is no assurance that we will be able to renew those fiber routes on favorable terms, or at all. If we are unable to renew those fiber routes on favorable terms, we may face increased costs or reduced revenues.

In order to expand our network to new locations, we often need to obtain additional rights-of-way, franchises, and other permits. Our failure to obtain these rights in a prompt and cost-effective manner may prevent us from expanding our network, which may be necessary to meet our contractual obligations to our customers and could expose us to liabilities.

If we lose or are unable to renew key real property leases where we have located our POPs, it could adversely affect our services and increase our costs, as we would be required to restructure our network and move our POPs.

Our business requires that we maintain, repair, upgrade, and periodically replace our facilities and networks. This requires management time and capital expenditures. In the event that we fail to maintain, repair, upgrade, or replace essential portions of our network or facilities, it could lead to a material degradation in the level of service that we provide to our customers. Our networks can be damaged in a number of ways, including by other parties engaged in construction close to our network facilities. In the event of such damage, we will be required

to incur expenses to repair the network. We could be subject to significant network repair and replacement expenses in the event a terrorist attack or a natural disaster damages our network. Further, the operation of our network requires the coordination and integration of sophisticated and highly specialized hardware and software. Our failure to maintain or properly operate this can lead to degradations or interruptions in customer service. Our failure to provide proper customer service could result in claims from our customers, early termination of contracts, and damage our reputation.

As of June 30, 2014, our total debt (including capital lease obligations) was $3,265.4 million, primarily consisting of ZGL’s $750.0 million of 8.125% Senior Secured Notes due 2020 (the “Senior Secured Notes”) and $500.0 million of 10.125% Senior Unsecured Notes due 2020 (together with the Senior Secured Notes, the “Notes”), its $1,990.1 million senior secured term loan facility (the “Term Loan Facility”) and $25.3 million in capital lease obligations. In addition, ZGL has a $250.0 million senior secured revolving credit facility (the “Revolver,” and collectively with the Term Loan Facility, the “Credit Facilities”), of which $243.6 million was available at such date. Subject to the limitations set forth in the indentures (the “Indentures”) governing the Notes and the agreement governing the Credit Facilities (the “Credit Agreement”), ZGL may incur additional indebtedness (including additional first lien obligations) in the future.

Cash payments for interest, net of capitalized interest, which are reflected in our cash flows from operating activities, during the year ended June 30, 2014 were $175.3 million and represented 31% of our cash flows from operating activities. We also made cash payments related to principal payments on our debt obligations (including capital leases) of $25.9 million, which are reflected in our cash flows from financing activities, and represent 5% of our cash flows from operating activities.

We may not be able to generate enough cash flow to meet our debt obligations.

Our future cash flow may be insufficient to meet our debt obligations and commitments. Any insufficiency could negatively impact our business. A range of economic, competitive, business, regulatory, and industry factors will affect our future financial performance, and, as a result, our ability to generate cash flow from

operations and to pay our debt. Many of these factors, such as economic and financial conditions in our industry and the global economy, or competitive initiatives of our competitors, are beyond our control.

If we do not generate enough cash flow from operations to satisfy our debt obligations, we may have to undertake alternative financing plans, such as:

We cannot assure you that we would be able to implement alternative financing plans, if necessary, on commercially reasonable terms, or at all, or that implementing any such alternative financing plans would allow us to meet our debt obligations.

If ZGL is unable to meet its debt service obligations, it would be in default under the terms of the Indentures and the Credit Agreement, permitting acceleration of the amounts due on the Notes and under the Credit Agreement and eliminating our ability to draw on the Revolver. If the amounts outstanding under the Credit Facilities, the Notes, or other future indebtedness were to be accelerated, we could be forced to file for bankruptcy.

The Indentures and the Credit Facilities each contain, and agreements governing future debt issuances may contain, covenants that restrict ZGL’s ability to, among other things:

As a result of these covenants, we are limited in the manner in which we may conduct our business, and as a result we may be unable to engage in favorable business activities or finance future operations or capital needs. The ability to comply with some of the covenants and restrictions contained in the Credit Agreement and the Indentures may be affected by events beyond our control. If market or other economic conditions deteriorate, our ability to comply with these covenants may be impaired. A failure to comply with the covenants, ratios, or tests in the Credit Agreement, the Indentures, or any future indebtedness could result in an event of default under the Credit Facilities, the Indentures or our future indebtedness.

In addition, the Credit Facilities require ZGL to comply with specified financial ratios, including ratios regarding total leverage, secured leverage and fixed charge coverage. Our ability to comply with these ratios may be affected by events beyond our control. These restrictions limit our ability to plan for or react to market conditions, meet capital needs, or otherwise constrain our activities or business plans. They also may adversely affect our ability to finance our operations, enter into acquisitions, or engage in other business activities that would be in our interest.

A breach of any of the covenants contained in the Credit Agreement, in any future credit agreement or the Indentures or our inability to comply with the financial ratios could result in an event of default, which would allow the lenders to declare all borrowings outstanding to be due and payable or to terminate the ability to borrow under the Revolver. If the amounts outstanding under the Credit Facilities, the Notes or other future indebtedness were to be accelerated, we cannot assure that our assets would be sufficient to repay in full the money owed, including the Notes. In such a situation, we could be forced to file for bankruptcy.

Our future tax liabilities are not predictable or controllable. If we become subject to increased levels of taxation, our financial condition and operations could be negatively impacted.

We provide telecommunication and other services in multiple jurisdictions across the United States and Europe and are, therefore, subject to multiple sets of complex and varying tax laws and rules. We cannot predict the amount of future tax liabilities to which we may become subject. Any increase in the amount of taxation incurred as a result of our operations or due to legislative or regulatory changes would be adverse to us. In addition, we may become subject to income tax audits by many tax jurisdictions throughout the world. It is possible that certain tax positions taken by us could result in tax liabilities for us. While we believe that our current provisions for taxes are reasonable and appropriate, we cannot assure you that these items will be settled for the amounts accrued or that we will not identify additional exposures in the future.

We cannot assure you whether, when or in what amounts we will be able to use our net operating losses, or when they will be depleted.

At June 30, 2014, we had approximately $1,110.0 million of federal net operating losses (“NOLs”), which relate primarily to prior acquisitions. Under certain circumstances, these NOLs can be used to offset our future federal and certain taxable income. If we experience an “ownership change,” as defined in Section 382 of the Internal Revenue Code and related Treasury regulations at a time when our market capitalization is below a certain level, our ability to use the NOLs could be substantially limited. This limit could impact the timing of the usage of the NOLs, thus accelerating cash tax payments or causing NOLs to expire prior to their use, which could affect the ultimate realization of the NOLs.

Furthermore, transactions that we enter into, as well as transactions by existing or future 5% stockholders that we do not participate in, could cause us to incur an “ownership change,” which could prevent us from fully utilizing our NOLs to reduce our federal income taxes. These limitations could cause us not to pursue otherwise favorable acquisitions and other transactions involving our capital stock, or could reduce the net benefits to be realized from any such transactions. Despite this, we expect to use substantially all of these NOLs and certain other deferred tax attributes as an offset to our federal future taxable income, although the timing of that use will depend upon our future earnings and future tax circumstances. If and when our NOLs are fully utilized, we expect that the amount of our cash flow dedicated to the payment of federal taxes will increase substantially.

We may be subject to interest rate risk and increasing interest rates may increase our interest expense.

Borrowings under each of the Credit Facilities bear, and our future indebtedness may bear, interest at variable rates and expose us to interest rate risk. If interest rates increase, our debt service obligations on the variable rate indebtedness would increase even though the amount borrowed remained the same, and our net income and cash available for servicing our indebtedness would decrease.

The international operations of our business expose us to risks that could materially and adversely affect the business.

We have operations and investments outside of the United States, as well as rights to undersea cable capacity extending to other countries, that expose us to risks inherent in international operations. These include:

We may as part of our expansion strategy increase our exposure to international investments and operations.

Our international operations are subject to the laws and regulations of the U.S. and many foreign countries, including the U.S. Foreign Corrupt Practices Act and the U.K. Bribery Act.

We are subject to a variety of laws regarding our international operations, including the U.S. Foreign Corrupt Practices Act and the U.K Bribery Act of 2010, and regulations issued by U.S. Customs and Border Protection, the U.S. Bureau of Industry and Security, the U.S. Treasury Department’s Office of Foreign Assets Control (“OFAC”) and various foreign governmental agencies. We cannot predict the nature, scope or effect of future regulatory requirements to which our international operations might be subject or the manner in which existing laws might be administered or interpreted. Actual or alleged violations of these laws could lead to enforcement actions and financial penalties that could result in substantial costs.

The U.S. Foreign Corrupt Practices Act, the U.K. Bribery Act and similar anti-bribery laws in other jurisdictions generally prohibit companies and their intermediaries from making improper payments for the purpose of obtaining or retaining business. Recent years have seen a substantial increase in anti-bribery law enforcement activity with more frequent and aggressive investigations and enforcement proceedings by both the Department of Justice and the U.S. Securities and Exchange Commission, increased enforcement activity by non-U.S. regulators and increases in criminal and civil proceedings brought against companies and individuals. We are in the process of creating and implementing a program for compliance with anti-bribery laws. Because our anti-bribery internal control policies and procedures have been recently implemented, we may have increased exposure to reckless or criminal acts committed by our employees or third-party intermediaries. Violations of these anti-bribery laws may result in criminal or civil sanctions, which could have a material adverse effect on our business, financial condition, and results of operations.

We conduct a portion of our business using the British Pound Sterling and the Euro. Appreciation of the U.S. Dollar adversely affects our consolidated revenue. Since we tend to incur costs in the same currency in which those operations realize revenue, the effect on operating income and operating cash flow is largely mitigated. However, if the U.S. Dollar appreciates significantly, future revenues, operating income and operating cash flows could be materially affected.

We may be vulnerable to security breaches that could disrupt our operations and adversely affect our business and operations.

Despite security measures and business continuity plans, our information technology networks and infrastructure may be vulnerable to damage, disruptions, or shutdowns due to unauthorized access, computer viruses, cyber-attacks, distributed denial of service, and other security breaches. An attack on or security breach of our network could result in interruption or cessation of services, our inability to meet our service level commitments, and potentially compromise customer data transmitted over our network. We cannot guarantee that our security measures will not be circumvented, resulting in network failures or interruptions that could impact our network availability and have a material adverse effect on our business, financial condition, and operational results. We may be required to expend significant resources to protect against such threats. If an actual or perceived breach of our security occurs, the market perception of the effectiveness of our security measures could be harmed, and we could lose customers. Any such events could result in legal claims or penalties, disruption in operations, misappropriation of sensitive data, damage to our reputation, and/or costly response measures, which could adversely affect the our business.

We could face increased competition from companies in the telecommunications and media industries that currently do not focus on bandwidth infrastructure.

Many of our competitors in the bandwidth infrastructure space are other focused bandwidth infrastructure providers that operate on a regional or local basis. In some cases we also compete with communications service providers who also own certain infrastructure assets and make them available to customers as an infrastructure service. These communication service providers include ILECs, such as AT&T and Verizon, and cable television companies, such as Comcast.

Some of these competitors have greater financial, managerial, sales and marketing, and research and development resources than we do and are able to promote their brands with significantly larger budgets. Most of them are also our customers. If ILECs and cable television companies focus on providing bandwidth infrastructure, it could have a material adverse effect on us. A few of these competitors also have significant fiber assets that they principally employ in the provision of their communications services. If any of these competitors with greater resources and/or significant fiber assets chose to focus those resources on bandwidth infrastructure, our ability to compete in the bandwidth infrastructure industry could be negatively impacted. To the extent that communication service providers, cable television companies, and other media companies choose to distribute their content over their own networks, that could reduce demand for our services. Additionally, significant new entrants into the bandwidth services industry would increase supply, which could cause prices for our services to decline.

Consolidation among companies in the telecommunications and cable television industries could further strengthen our competitors and adversely impact our business.

The telecommunications and cable television industries are intensely competitive and continue to undergo significant consolidation. There are many reasons for consolidation in these industries, including the desire for communications and cable television companies to acquire network assets in regions where they currently have

no or insufficient amounts of owned network infrastructure. The consolidation within the industry may cause customers to disconnect services to move them to their own networks, or consolidate buying with other bandwidth infrastructure providers. Additionally, consolidation in the industry could further strengthen our competitors, give them greater financial resources and geographic reach, and allow them to put additional pressure on prices for bandwidth infrastructure services.

Certain of our services are subject to regulation that could change or otherwise impact us in an adverse manner.

Communications services are subject to domestic and international regulation at the federal, state, and local levels. These regulations affect our business and our existing and potential competitors. In addition, in the United States, both the Federal Communications Commission (“FCC”) and the state public utility commissions or similar regulatory authorities (the “State PUCs”) typically require us to file periodic reports, pay various regulatory fees and assessments, and to comply with their regulations. Such compliance can be costly and burdensome and may affect the way we conduct our business. Delays in receiving required regulatory approvals (including approvals relating to acquisitions or financing activities or for interconnection agreements with other carriers), the enactment of new and adverse international or domestic legislation or regulations (including those pertaining to broadband initiatives and net-neutrality), or the denial, modification or termination by a regulator of any approval or authorization, could have a material adverse effect on our business. Further, the current regulatory landscape is subject to change through judicial review of current legislation and rulemaking by the FCC and other domestic and international rulemaking bodies. These bodies regularly consider changes to their regulatory framework and fee obligations. Changes in current regulation may make it more difficult to obtain the approvals necessary to operate our business, significantly increase the regulatory fees to which we are subject, or have other adverse effects on our future operations in the United States and Europe.

Unfavorable general global economic conditions could negatively impact our operating results and financial condition.

Unfavorable general global economic conditions could negatively affect our business. Although it is difficult to predict the impact of general economic conditions on our business, these conditions could adversely affect the affordability of, and customer demand for, our services, and could cause customers to delay or forgo purchases of our services. One or more of these circumstances could cause our revenue to decline. Also, our customers may not be able to obtain adequate access to credit, which could affect their ability to purchase our services or make timely payments to us. The current economic conditions, including federal fiscal and monetary policy actions, may lead to inflationary conditions in our cost base, particularly in our lease and personnel related expenses. This could harm our margins and profitability if we are unable to increase prices or reduce costs sufficiently to offset the effects of inflation in our cost base. For these reasons, among others, if challenging economic conditions persist or worsen, our operating results and financial condition could be adversely affected.

Disruptions in the financial markets could affect our ability to obtain debt or equity financing or to refinance our existing indebtedness on reasonable terms or at all.

Disruptions in the financial markets could impact our ability to obtain debt or equity financing, or lines of credit, in the future as well as impact our ability to refinance our existing indebtedness on reasonable terms or at all, which could affect our strategic operations and our financial performance and force modifications to our operations.

Changes in our traffic patterns or industry practice could result in increasing peering costs for our IP network.

Peering agreements with other ISPs have allowed us to access the Internet and exchange traffic with these providers. In most cases, we peer with these ISPs on a payment-free basis, referred to as settlement-free peering. We plan to continue to leverage this settlement-free peering. If other providers change the terms upon which they

allow settlement-free peering or if changes in Internet traffic patterns, including the ratio of inbound to outbound traffic, cause us to fall below the criteria that these providers use in allowing settlement-free peering, the costs of operating our Internet backbone will likely increase. Any increases in costs could have an adverse effect on our margins and our ability to compete in the IP market.

The ongoing threat of terrorist activity and other acts of war or hostility have had, and may continue to have, an adverse effect on business, financial and general economic conditions. Effects from these events and any future terrorist activity, including cyber terrorism, may, in turn, increase our costs due to the need to provide enhanced security, which would adversely affect our business and results of operations. Terrorist activity could damage or destroy our Internet infrastructure and may adversely affect our ability to attract and retain customers, raise capital, and operate and maintain our network access points. We are particularly vulnerable to acts of terrorism because of our large datacenter presence in New York. We are also susceptible to other catastrophic events such as major natural disasters, extreme weather, fires, or similar events that could affect our headquarters, other offices, our network, infrastructure, or equipment, all of which could adversely affect our business.

There is no existing market for our common stock, and we do not know if one will develop. Even if a market does develop, the stock prices in the market may not exceed the offering price.

Prior to this offering, there has not been a public market for our common stock or any of our equity interests. We cannot predict the extent to which investor interest in our company will lead to the development of an active trading market on the New York Stock Exchange (“NYSE”), or how liquid that market may become. An active public market for our common stock may not develop or be sustained after the offering. If an active trading market does not develop or is not sustained, you may have difficulty selling any shares that you buy.

The initial public offering price for the common stock will be determined by negotiations among us and the representatives of the underwriters and may not be indicative of prices that will prevail in the open market following this offering. Consequently, you may not be able to sell shares of our common stock at prices equal to or greater than the price you pay in this offering.

Our stock price may be volatile or may decline regardless of our operating performance and you may not be able to resell your shares at or above the initial public offering price, if at all.

The market price of our common stock may fluctuate significantly in response to numerous factors, many of which are beyond our control. In addition to the other risk factors described herein, these factors include:

If the market price of our common stock after this offering does not exceed the initial public offering price, you may not realize any return on your investment in our common stock and may lose some or all of your investment. In addition, the stock markets have experienced extreme fluctuations in price and trading volume that have caused and will likely continue to cause the stock prices of many telecommunications companies to fluctuate in a manner unrelated or disproportionate to the operating performance of those companies. In the past, stockholders have instituted securities class action litigation following periods of declining stock prices. If we were to become involved in securities litigation, we could face substantial costs and be forced to divert resources and the attention of management from our business, which could adversely affect our business.

If securities or industry analysts do not publish, continue to publish, or publish inaccurate or unfavorable research about our business, our stock price and trading volume could decline.

The trading market for our common stock depends on the research and reports that securities or industry analysts publish about us or our business. Certain securities and industry analysts currently publish research reports with respect to certain of our debt securities; however, they are currently not publishing reports on our equity securities. If they fail to pick up coverage of our equity securities, fail to publish reports about us or our securities regularly, or otherwise cease to cover our Company, demand for our stock could decrease and the trading price of our stock could decline. A downgrade of our stock or the publication of inaccurate or unfavorable research about our business would likely cause our stock price to decline.

Sales of substantial amounts of our common stock in the public market, or the perception that they might occur, could reduce the price that our common stock might otherwise attain.

The price of our common stock could decline if there are substantial sales of our common stock, particularly sales by our directors, executive officers and significant stockholders, or if there is a large number of shares of our common stock available for sale. After this offering, we will have a small public float relative to the total number of shares of our common stock issued and outstanding, and a substantial majority of our issued and outstanding shares will be restricted as a result of securities laws, lock-up agreements or other contractual provisions that restrict transfers.

After this offering, there will be outstanding 234,100,000 shares of our common stock. This includes the 28,900,000 shares that we or the selling stockholders are selling in this offering, which may be resold in the public market immediately. Substantially all of the holders of our outstanding shares prior to this offering are subject to lock-up agreements, as more fully described in “Underwriting.” These lock-up restrictions will expire 180 days after the date of this prospectus, subject to extension in some circumstances. Shares held by directors, executive officers and other affiliates will be subject to volume limitations under Rule 144 under the Securities Act of 1933 (the “Securities Act”) and various vesting agreements in some cases. Concurrently with the closing of this offering, holders of approximately 197.0 million shares of our common stock will enter into a Stockholders Agreement among the Company and certain stockholders named therein (the “Stockholders Agreement”) that limits their ability to transfer their shares until the one year anniversary of this offering, other than to affiliates, pursuant to the Registration Rights Agreement or for bona fide hedging purposes. The Stockholders Agreement will provide, however, that approximately 17.8 million of the shares held by parties to the agreement (assuming an initial public offering price at the midpoint of the estimated price range set forth on the cover of this prospectus) will be released from the restrictions thereunder in certain circumstances. See “Certain Relationships and Related Party Transactions.”

After this offering, the holders of an aggregate of approximately 197.0 million shares of our common stock outstanding will have rights, subject to some conditions, to require us to file registration statements covering their shares or to include their shares in registration statements that we may file for ourselves or our stockholders. For a more detailed description of these registration rights, see “Description of Capital Stock—Registration Rights.” All of these shares are subject to market standoff or lock-up agreements restricting their sale for 180 days after the date of this prospectus, subject to extension in some circumstances. We also intend to file registration statements covering the shares of common stock that we have issued and may issue under our employee equity incentive plans. Once these registration statements are filed, these shares will be able to be sold freely in the public market upon issuance, subject to existing market standoff or lock-up agreements. Morgan Stanley & Co. LLC and Barclays Capital Inc. acting together may, in their sole discretion, permit our officers, directors, employees and current stockholders who are subject to the contractual lock up to sell shares prior to the expiration of the lock-up agreements. See “Underwriting” for more information.

Following this offering, there will be 14,000,000 shares available for issuance under our stock incentive plan, and we could also make equity compensation grants outside of our stock incentive plan. The shares issuable under our stock incentive plan will be registered pursuant to a registration statement on Form S-8.

We may issue shares of our common stock or securities convertible into our common stock from time to time in connection with financings, acquisitions, investments, or otherwise. Any such issuance could result in ownership dilution to you as a stockholder, and cause the trading price of our common stock to decline.

Delaware law and our amended and restated certificate of incorporation and bylaws contain provisions that could delay or discourage takeover attempts that our stockholders may consider favorable.

Provisions in our amended and restated certificate of incorporation and amended and restated bylaws may have the effect of delaying or preventing a change of control or changes in our management. These provisions include the following:

We have elected not to be governed by the provisions of Section 203 of the Delaware General Corporation Law (the “DGCL”); however, our amended and restated certificate of incorporation includes similar provisions providing that we may not engage in certain “business combinations” with any “interested stockholder” for three years following the time that such stockholder became an interested stockholder, unless the business combination is approved in a prescribed manner. A “business combination” includes, among other things, a merger, asset or stock sale or other transaction resulting in a financial benefit to the interested stockholder. An “interested stockholder” is a person who, together with affiliates and associates, owns, or did own, within three years prior to the determination of interested stockholder status, 15% or more of a corporation’s voting stock. Pursuant to our amended and restated certificate of incorporation, the term “interested stockholder” does not include the entities that are current preferred equity holders of CII, which entities are listed in our certificate of incorporation (the “Exempt Stockholders”), each of their respective affiliates, and any of their respective direct or indirect transferees and any group as to which such persons are a party.

These provisions may prohibit large stockholders (with the exception of the Exempt Stockholders described above), particularly those owning 15% or more of our outstanding voting stock, from merging or combining with us. These provisions in our amended and restated certificate of incorporation and our amended and restated bylaws and the DGCL could discourage potential takeover attempts, could reduce the price that investors are willing to pay for shares of our common stock in the future and could potentially result in the market price of our common stock being lower than it otherwise would be.

In addition, our debt agreements may require very significant payments if we have a change of control, which reduces the possibility that such an event will occur.

Pursuant to the terms of our amended and restated certificate of incorporation, the Exempt Stockholders are not required to offer corporate opportunities to us, and certain of our directors and officers are permitted to offer certain corporate opportunities to the Exempt Stockholders before us.

The Exempt Stockholders are in the business of making investments in companies and may from time to time acquire and hold interests in businesses that compete directly or indirectly with us. Our amended and restated certificate of incorporation provides that none of the Exempt Stockholders, any of their respective affiliates or any director, officer, employee or other representative of an Exempt Stockholder or any of their respective affiliates who is also one of our directors, officers or agents (each, an “Identified Person”) will have any duty to refrain from engaging in the same or similar business activities or lines of business in which we or our affiliates engage or propose to engage or otherwise competing with us or our affiliates.

In addition, in the event that an Identified Person acquires knowledge of a potential transaction or other business opportunity that may be a corporate opportunity for itself, himself or herself and us or our affiliates, they have no duty, to the fullest extent permitted by law, to offer such corporate opportunity to us, our stockholders or our affiliates and shall not be liable to us or our stockholders or our affiliates for breach of fiduciary duty as a stockholder, director, officer or agent solely by reason of the fact that such Identified Person pursues or acquires such corporate opportunity or offers or directs it to another person. We have renounced any interest or expectancy in, or right to be offered an opportunity to participate in, such corporate opportunities. The foregoing provisions shall not apply to any interest we may have in any corporate opportunity offered to any Identified Person who is one of our officers or directors, if such opportunity is expressly offered to such person solely in his or her capacity as such.

Our directors, executive officers, and principal stockholders will collectively own approximately 75.7% of our outstanding common stock after this offering and will continue to have substantial control over the company.

Upon completion of this offering, our directors, executive officers, and holders of more than 5% of our common stock, together with their affiliates, will beneficially own, in the aggregate, approximately 75.7% of our outstanding common stock. As a result, these stockholders, acting together, would have the ability to control the

outcome of matters submitted to our stockholders for approval, including the election of directors and any merger, consolidation or sale of all or substantially all of our assets. In addition, these stockholders, acting together, would have the ability to control our management and affairs. Accordingly, this concentration of ownership might harm the market price of our common stock by:

We have never declared or paid cash dividends on our common stock. ZGL’s ability to pay dividends to us is limited by its Credit Agreement and its Indentures, which may in turn limit our ability to pay dividends on our common stock. Our ability to pay dividends may also be restricted by the terms of any future credit agreement or any future debt or preferred securities of ours or of our subsidiaries. We currently intend to retain any future earnings to finance the operation and expansion of our business, and we do not expect to declare or pay any dividends in the foreseeable future. As a result, you may only receive a return on your investment in our common stock if the market price of our common stock increases.

If you purchase shares of our common stock in this offering, you will experience substantial and immediate dilution.

The initial public offering price of our common stock will be substantially higher than the pro forma net tangible book value per share of our outstanding common stock following this offering. Therefore, if you purchase shares of our common stock in this offering, assuming an initial public offering price at the midpoint of the estimated price range set forth on the cover of this prospectus, you will experience immediate dilution of $26.42 per share, the difference between the price per share you pay for our common stock and the pro forma net tangible book value per share as of June 30, 2014, after giving effect to the issuance of shares of our common stock in this offering. See “Dilution.” This dilution is due in large part to the fact that our earlier investors paid substantially less than the initial public offering price when they purchased their shares of our capital stock.

We will incur increased costs as a result of being a publicly-traded company.

After the completion of this offering, we will be subject to the reporting requirements of the Securities Exchange Act of 1934 (the “Exchange Act”), the Sarbanes-Oxley Act of 2002 (the “Sarbanes-Oxley Act”), the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 and the rules and regulations of the stock market on which our common stock is traded. Being subject to these rules and regulations will result in legal, accounting and financial compliance costs, will make some activities more difficult, time-consuming and costly and may also place significant strain on our personnel, systems and resources.

If we do not timely satisfy the requirements of Section 404 of the Sarbanes-Oxley Act of 2002, the trading price of our common stock could be adversely affected.

The Sarbanes-Oxley Act requires, among other things, that we test the effectiveness of our internal control over financial reporting in accordance with an established internal control framework and report on our conclusion as to the effectiveness of our internal control over financial reporting. Any delays or difficulty in satisfying the requirements of the Sarbanes-Oxley Act could, among other things, cause investors to lose confidence in, or otherwise be unable to rely on, the accuracy of our reported financial information, which could adversely affect the trading price of our common stock.

As a public company, we will be required to maintain internal control over financial reporting and to report any material weaknesses in such internal control. We are in the process of designing, implementing, and testing our internal control over financial reporting required to comply with this obligation, which is a time-consuming, costly, and complicated process.

Information contained in this prospectus that is not historical by nature constitutes “forward-looking statements,” which can be identified by the use of forward-looking terminology such as “believes,” “expects,” “plans,” “intends,” “estimates,” “projects,” “could,” “may,” “will,” “should,” or “anticipates” or the negatives thereof, other variations thereon, or comparable terminology, or by discussions of strategy. No assurance can be given that future results expressed or implied by the forward-looking statements will be achieved, and actual results may differ materially from those contemplated by the forward-looking statements. Such statements are based on management’s current expectations and beliefs and are subject to a number of risks and uncertainties that could cause actual results to differ materially from those expressed or implied by the forward-looking statements. These risks and uncertainties include, but are not limited to:

Each $1.00 increase or decrease in the assumed initial public offering price of $22.50 per share (the midpoint of the estimated price range set forth on the cover of this prospectus) would increase or decrease, as applicable, the net proceeds we receive from this offering by approximately $10.6 million, assuming the number of shares offered by us, as set forth on the cover of this prospectus, remains the same and after deducting the underwriting discount and estimated offering expenses.

Pending use of the net proceeds from this offering described above, we intend to invest the net proceeds in short-term, investment-grade instruments, such as U.S. Treasury bonds or money market securities.

We currently intend to retain all available funds and any future earnings for use in the operation of our business, and therefore we do not anticipate paying any cash dividends in the foreseeable future. Any future determination to pay dividends will be at the discretion of our board of directors and will depend upon our financial condition, results of operations, cash flows, capital requirements, and other factors that our board of directors deems relevant. We are a holding company, and substantially all of our operations are carried out by our subsidiary, ZGL, and its subsidiaries. ZGL’s ability to pay dividends to us is limited by the Credit Agreement and Indentures, which may in turn limit our ability to pay dividends on our common stock. Our ability to pay dividends may also be restricted by the terms of any future credit agreement or any future debt or preferred securities.

The following table sets forth our cash and cash equivalents, stock-based compensation liability, and capitalization as of June 30, 2014:

You should read the following table in conjunction with the sections entitled “Use of Proceeds,” “Selected Historical Consolidated Financial Information” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and related notes included elsewhere in this prospectus. The pro forma as adjusted column assumes that the underwriters do not exercise their option to purchase additional shares from the selling stockholders.

If you invest in our common stock, your interest will be immediately diluted to the extent of the difference between the initial public offering price per share of our common stock and the pro forma as adjusted net tangible book value per share of our common stock immediately after this offering.

Historical net tangible book value/(deficit) per share is our historical net tangible book value, divided by the number of outstanding shares. The historical net tangible book deficit of our common stock as of June 30, 2014 was $(1,150.3) million, or $(1,150,274) per share. Historical net tangible book value/(deficit) is the amount of our total tangible assets less our total liabilities.

The pro forma net tangible book deficit of our common stock as of June 30, 2014 was $(1,150.3) million, or $(5.16) per share. Pro forma net tangible book value/(deficit) and pro forma net tangible book value/(deficit) per share give effect to the Restructuring.

Pro forma as adjusted net tangible book value/(deficit) gives effect to (i) the Restructuring, (ii) the sale of 28,900,000 shares of common stock in this offering at the initial public offering price of $22.50 per share, the midpoint of the estimated price range set forth on the cover of this prospectus, and after deducting the underwriting discount and estimated offering expenses payable by us, and (iii) the application of the net proceeds received by us as described under “Use of Proceeds.” As of June 30, 2014, our pro forma as adjusted net tangible book deficit would have been $(917.5) million, or $(3.92) per share. This represents an immediate decrease in pro forma net tangible book deficit of $1.24 per share to our existing stockholders and an immediate dilution of $26.42 per share to investors purchasing common stock in this offering.

The following table illustrates this dilution on a per share basis to new investors:

If the underwriters exercise their option to purchase additional shares of our common stock in full, the pro forma as adjusted net tangible book deficit per share will be $(3.92) per share, the decrease in pro forma net tangible book deficit per share to existing stockholders will be $1.24 per share and the dilution per share to new investors purchasing shares in this offering will be $26.42 per share.

The table below summarizes as of June 30, 2014, on a pro forma as adjusted basis described above, the number of shares of our common stock, the total consideration, and the average price per share (i) paid to us by our existing stockholders and (ii) to be paid by new investors purchasing our common stock in this offering (assuming no exercise of the underwriters’ option to purchase additional shares), before deducting the underwriting discount and estimated offering expenses payable by us.

If the underwriters’ option to purchase additional shares in this offering is exercised in full, the percentage of shares of our common stock held by existing stockholders will be reduced to 86% of the total number of shares of our common stock outstanding after this offering, and the number of shares held by new investors will increase to 33.2 million shares, or 14% of the total number of shares of our common stock outstanding after this offering.

The following tables present selected historical consolidated financial information of the Company for the periods and as of the dates indicated. The selected historical consolidated financial information as of June 30, 2013 and 2014 and for the years ended June 30, 2012, 2013 and 2014 is derived from, and qualified by reference to, our audited consolidated financial statements included elsewhere in this prospectus. The selected historical consolidated financial information as of June 30, 2011 and 2012 and for the year ended June 30, 2011 is derived from our audited consolidated financial statements not included in this prospectus. The selected historical consolidated financial information as of and for the year ended June 30, 2010 is derived from our unaudited consolidated financial statements not included in this prospectus. Our unaudited consolidated financial statements have been prepared on the same basis as our audited consolidated financial statements and, in the opinion of management, reflect all adjustments, consisting only of normal and recurring adjustments, necessary for a fair presentation of such financial statements in all material respects.

(1) Pro forma basic and diluted net loss per share were computed to give effect to (i) the Restructuring and (ii) the issuance of shares of common stock by us in this offering as if they had occurred on July 1, 2013.

(2) See Note 2—Basis of Presentation and Significant Accounting Policies—p. Government Grants to our audited consolidated financial statements for an explanation of our stimulus grants.

(3) Adjusted EBITDA is not a financial measurement prepared in accordance with GAAP. We define Adjusted EBITDA as earnings from continuing operations before interest, income taxes, depreciation and amortization (“EBITDA”) adjusted to exclude acquisition or disposal-related transaction costs, losses on extinguishment of debt, stock-based compensation, unrealized foreign currency gains on an intercompany loan, and impairment of cost method investment. See “Non-GAAP Financial Measures.” The table above sets forth, for the periods indicated, a reconciliation of net loss to Adjusted EBITDA, as net loss is calculated in accordance with GAAP.

(4) Unrealized foreign currency gain results from the translation of intercompany loans to foreign subsidiaries denominated in U.S. dollars to British pounds, the functional currency of the subsidiaries.

(5) Transaction costs include expenses associated with professional services (i.e. legal, accounting, regulatory, etc.) rendered in connection with signed and/or closed acquisitions or disposals (including spin-offs), travel expense, severance expense incurred on the date of acquisition or disposal, and other direct expenses incurred that are associated with such acquisitions or disposals.

The following discussion and analysis should be read together with our audited consolidated financial statements and the related notes appearing elsewhere in this prospectus. In addition to historical consolidated financial information, the following discussion contains forward-looking statements that reflect our plans, estimates and beliefs. Our actual results could differ materially. Factors that could cause or contribute to these differences include those discussed below and elsewhere in this prospectus, particularly in “Risk Factors.” Unless the context otherwise requires, “we,” “us,” “our,” and the “Company” refer to Zayo Group Holdings, Inc. and its consolidated subsidiaries, including Zayo Group, LLC (“ZGL”).

Amounts presented are rounded. As such, rounding differences could occur in period-over-period changes and percentages reported throughout this discussion and analysis.

Prior to the Restructuring and consummation of this offering, Zayo Group Holdings, Inc. was a direct, wholly owned subsidiary of Communications Infrastructure Investments, LLC (“CII”). Our fiscal year ends June 30 each year, and we refer to the fiscal year ended June 30, 2014 as “Fiscal 2014,” the fiscal year ended June 30, 2013 as “Fiscal 2013,” and the fiscal year ended June 30, 2012 as “Fiscal 2012.”

We use the management approach to determine the segment financial information that should be disaggregated and presented. The management approach is based on the manner by which management has organized the segments within the Company for making operating decisions, allocating resources, and assessing performance. As of June 30, 2014, we have three reportable segments as described below:

As a result of the growth of our business from these acquisitions, and capital expenditures and the increased debt used to fund those investing activities, our results of operations for the respective periods presented and discussed herein are not comparable.

On July 2, 2012, we acquired 100% of the outstanding capital stock of AboveNet, a public company listed on the New York Stock Exchange, for total consideration of approximately $2,210.0 million in cash, net of $141.6 million of cash acquired. At the closing, each outstanding share of AboveNet common stock was converted into the right to receive $84 in cash.

AboveNet was a provider of bandwidth infrastructure and network-neutral colocation and interconnection services, primarily to large corporate enterprise clients and communication carriers, including Fortune 1000 and FTSE 500 companies in the United States and Europe. AboveNet’s commercial strategy was consistent with ours, which was to focus on leveraging its infrastructure assets to provide bandwidth infrastructure services to a select set of customers with high-bandwidth demands. AboveNet provided physical infrastructure and lit services over its dense metropolitan, regional, national, and international fiber networks. It also operated a Tier 1 IP network with direct and indirect (through peering arrangements) connectivity in many of the most important bandwidth centers and peering exchanges in the U.S. and Europe. Its product set was highly aligned with our own, consisting primarily of dark fiber, wavelengths, Ethernet, IP, and colocation services. AboveNet had also built a very strong base of business with enterprise clients, particularly within the financial services sector.

The acquisition of AboveNet added approximately 20,600 new route miles and approximately 2,500,000 fiber miles to our network and added connections to approximately 4,000 on-net buildings, including more than 2,600 enterprise locations, many of which housed some of the largest corporate users of network services in the world. AboveNet’s metropolitan networks typically contained 432, and in some cases 864, fiber strands in each cable.

This high fiber count allowed AboveNet to add new customers in a timely and cost-effective manner by focusing incremental construction and capital expenditures on the laterals that connect to the customer premises. AboveNet’s metropolitan networks served 17 markets in the U.S., with strong network footprints in a number of the largest metro markets, including Boston, Chicago, Los Angeles, New York, Philadelphia, San Francisco, Seattle, and Washington, D.C. It also served four metro markets in Europe: London, Amsterdam, Frankfurt, and Paris. These locations also included many private datacenters and hub locations that were important for AboveNet’s customers. AboveNet used under-sea capacity on the Trans-Atlantic undersea telecommunications network and other trans-Atlantic cables to provide connectivity from the U.S. to Europe.

The results of the acquired AboveNet business are included in our operating results beginning July 2, 2012.

On December 1, 2011, we acquired 100% of the equity of 360networks. We paid the consideration of approximately $317.9 million, net of approximately $0.7 million in cash acquired and net of an assumed working capital deficiency of approximately $26.4 million.

The acquired 360networks business operated approximately 19,800 route miles of intercity and metropolitan fiber network across 21 states and British Columbia. 360networks’ intercity network interconnected over 70 markets across the central and western United States. In addition to its intercity network, 360networks operated over 800 route miles of metropolitan fiber networks across 25 markets, including Seattle, Denver, Colorado Springs, Omaha, Sacramento, and Salt Lake City.

The results of the acquired 360networks business are included in our operating results beginning December 1, 2011.

On May 16, 2014, we acquired all of the outstanding shares of Geo, which is a London-based dark fiber provider. The consideration of £174 million ($292.3 million), net of approximately £8.2 million ($13.7 million) in cash acquired, was paid with a combination of cash on hand and available funds drawn on our $250 million revolving credit facility.

Geo owns and operates a high capacity fiber network in the United Kingdom, providing dark fiber and co-location services to a variety of high-bandwidth sectors including media companies, service providers, financial services, datacenters, and gaming organizations. The acquisition added over 2,100 route miles to our European network and additional connectivity to 587 on-net buildings.

The results of the acquired Geo business are included in our operating results beginning May 16, 2014.

The table below summarizes the dates and purchase prices (which are net of cash acquired and includes assumption of debt and capital leases) of all acquisitions and asset purchases through June 30, 2014.

We completed each of the acquisitions described above, with the exception of Voicepipe and Corelink, with cash raised through combinations of equity issuances and the incurrence of debt. We acquired Voicepipe from certain existing CII equity holders in exchange for CII preferred units, and we acquired Corelink with a combination of cash and CII preferred units.

On July 1, 2014, we acquired a 96% equity interest in Neo Telecoms (“Neo”), a Paris-based bandwidth infrastructure company, for a purchase price of €57.2 million ($78.1 million based on the foreign currency exchange rate on that date). The purchase price was funded with cash on hand available from the proceeds of the

Sixth Amendment to our Term Loan Facility. The acquisition of Neo added over 300 route miles of owned Paris metro fiber and approximately 540 on-net buildings to our network. Neo also operates nine colocation centers across France, offering more than 36,000 square feet of datacenter space. The Paris and regional network throughout France will be integrated into our existing European network connecting London, Frankfurt, and Amsterdam and the U.S.

The results of the acquired Neo business are not included in our operating results presented herein, as the acquisition closed July 1, 2014.

On July 1, 2014, we acquired Colo Facilities Atlanta (“AtlantaNAP”), a data center and managed services provider in Atlanta, for a purchase price of $52.5 million. The purchase price was paid with cash on hand. The acquisition of AtlantaNAP added approximately 72,000 square feet of total data center space, including 42,000 square feet of conditioned colocation space.

The results of the acquired AtlantaNAP business are not included in our operating results presented herein, as the acquisition closed July 1, 2014.

In connection with certain business combinations, we have acquired assets and liabilities that support products outside of our primary focus of providing bandwidth infrastructure services. On June 13, 2014, we spun off all of our equity interest in Onvoy, LLC (“Onvoy”), a business that provides voice and managed services, by a non-cash distribution to CII. The results of operations of Onvoy are presented as discontinued operations. See Note 4—Spin-off of Business to our audited consolidated financial statements.

During Fiscal 2012, Fiscal 2013, and Fiscal 2014, the results of the operations of Onvoy are presented in a single caption entitled, “Earnings from discontinued operations, net of income taxes” on our consolidated statements of operations. All discussions contained in this “Management’s Discussion and Analysis of Financial Condition and Results of Operations” relate only to our results of operations from continuing operations.

We had total indebtedness (excluding capital lease obligations) of $3,240.1 million and $2,830.7 million as of June 30, 2014 and 2013, respectively. As of June 30, 2014, our indebtedness consisted of $750.0 million aggregate principal amount of 8.125% senior secured first-priority notes due 2020 issued by ZGL (the “Senior Secured Notes”), $500.0 million of 10.125% senior unsecured notes due 2020 issued by ZGL (the “Senior Unsecured Notes,” and together with the Senior Secured Notes, the “Notes”), and a $1,990.1 million senior secured term loan facility of ZGL (the “Term Loan Facility”). The interest rate on the Term Loan Facility is floating based on LIBOR (subject to a floor of 1.0%) plus the applicable margin and was 4.00% and 4.50% as of June 30, 2014 and 2013, respectively. ZGL also has a $250 million senior secured revolving credit facility (the “Revolver”), which was undrawn as of June 30, 2014. On May 16, 2014, we entered into a Sixth Amendment (the “Sixth Amendment”) to the credit agreement governing the Term Loan Facility and Revolver (the “Credit Agreement”). The Sixth Amendment increased the Company’s Term Loan Facility by $275.0 million. The $275.0 million add-on was priced at 99.5%. No other terms of the Credit Agreement were amended.

In August 2012, we entered into interest rate swap agreements with an aggregate notional value of $750.0 million and a maturity date of June 30, 2017. The contracts state that we pay a 1.67% fixed rate of interest for the term of the agreement, which began June 30, 2013. The counterparties pay to us the greater of actual LIBOR or 1.25%. We entered into the swap arrangements to reduce the risk of increased interest costs associated with potential future increases in LIBOR rates. As of June 30, 2014, the estimated fair value of the interest rate swaps was a liability of $2.0 million.

During Fiscal 2014, 2013, and 2012, we invested, net of stimulus grant reimbursements, $360.8 million, $323.2 million, and $124.1 million, respectively, in capital expenditures primarily to expand our fiber network to support new customer contracts. We expect to continue to make significant capital expenditures in future periods. During Fiscal 2013 and 2012, we received a total of $9.3 million and $22.8 million, respectively, in grant money from the National Telecommunications and Information Administration’s Broadband Technology Opportunities Program (“BTOP”) for reimbursement of property and equipment expenditures. We did not receive any grant money during the year ended June 30, 2014. The BTOP program is intended to support the deployment of broadband infrastructure, encourage sustainable adoption of broadband service, and develop and maintain a nationwide public map of broadband service capability and availability, under which recipients are required to comply with certain operational and reporting requirements as it relates to these broadband infrastructure assets. The Company has accounted for these funds as a reduction of the cost of its fiber optic network.

In connection with the AboveNet acquisition, on July 2, 2012, ZGL issued the Notes and entered into the Credit Agreement. In addition, CII concluded the sale of preferred units of CII pursuant to certain securities purchase agreements with new private investment funds, as well as certain existing owners of CII and other investors. The total value of the preferred units issued pursuant to the securities purchase agreements was approximately $470.3 million, net of $2.0 million in costs associated with raising the additional capital. $133.2 million of the net proceeds from the equity raised were contributed to us in June 2012, and the remaining $337.1 million was contributed to us in July 2012.

A portion of the proceeds from the equity contribution, together with (i) the net proceeds from the Notes and the Term Loan Facility and (ii) cash on hand, were used to refinance ZGL’s then-existing indebtedness and to pay the cash consideration for the AboveNet acquisition and associated fees and expenses. In connection with the Notes offering and the Term Loan Facility, we recorded an original issue discount of $30.0 million and incurred debt issuance costs of $83.1 million.

On October 5, 2012 and February 27, 2013, we amended the Credit Agreement to reduce the interest rate on the Term Loan Facility and Revolver and removed the senior secured and total leverage maintenance covenants and increased the total leverage ratio required to be met in order to incur certain additional indebtedness.

In connection with the Fiscal 2013 refinancing transactions discussed above, we recognized an expense of $77.3 million during the year ended June 30, 2013, associated with debt extinguishment costs. The loss on extinguishment of debt associated with these transactions includes a portion of early call premiums paid to non-consenting creditors, non-cash expense associated with the write-off of unamortized debt issuance costs and issuance discounts on the debt balances accounted for as an extinguishment and certain fees paid to third parties involved in the debt refinancing transactions.

On November 26, 2013, we entered into a Fifth Amendment (the “Fifth Amendment”) to the Credit Agreement that increased the Term Loan Facility by $150.0 million to $1,749.8 million, and reduced the interest rate on the Term Loan Facility to LIBOR plus 3.0%, with a minimum LIBOR rate of 1.0%. The interest rate on the Revolver was also amended to LIBOR plus 2.75% (based on the current leverage ratio of ZGL). We recognized debt extinguishment expense in November 2013 of $1.9 million related to the Fifth Amendment and incurred an additional $1.5 million in debt issuance costs. We did not incur an early redemption premium.

On May 16, 2014, we entered into the Sixth Amendment to the Credit Agreement that increased the Term Loan Facility by $275.0 million to $2,015.9 million. The $275.0 million add-on was priced at 99.5%, and we incurred debt issuance costs of $3.2 million. No other terms of the Credit Agreement were amended.

Our revenue is comprised predominately of monthly recurring revenue (“MRR”). MRR is related to an ongoing service that is generally fixed in price and paid by the customer on a monthly basis. We also report monthly amortized revenue (“MAR”), which represents the amortized portion of previously collected upfront charges to customers. Upfront charges are typically related to IRUs structured as pre-payments rather than monthly recurring payments (though we structure IRUs as both prepaid and recurring, largely dependent on the customers’ preference) and installation fees. The last category of revenue we report is other revenue. Other revenue includes credits and adjustments, termination revenue, construction services, and equipment sales.

Our consolidated reported revenue in any given period is a function of our beginning revenue under contract and the impact of organic growth and acquisition activity. Our organic activity is driven by net new sales (“bookings”), gross installed revenue (“installs”) and churn processed (“churn”) as further described below.

Given the size and amount of acquisitions we have completed, we have estimated the revenue growth rate associated with our organic activity in each period reported. Our estimated organic growth rate is calculated by adding an estimate of the acquired companies’ revenue for the reporting period prior to the date of inclusion in our results of operations, and then calculating the growth rate between the two reported periods. The estimate of acquired annual revenue is based on the acquired companies’ revenues for the most recent quarter prior to close (including estimated purchase accounting adjustments) multiplied by four, except in the case of AboveNet, which is based upon publicly reported revenue for the full period from June 30, 2011 to June 30, 2012. If, in calculating our estimated organic growth rates, we were to use the actual revenue results for the four quarters preceding the closing of each of our acquisitions, including AboveNet, our estimated organic growth rates would be higher than the estimated organic growth rates presented. If we were to use acquired annualized revenue, calculated by taking each acquired company’s revenues for the most recent quarter prior to the closing of such acquisition and multiplying by four, including for AboveNet, our estimated organic growth rates would be lower than the estimated organic growth rates presented.

Our operating costs and expenses consist of network expense (“Netex”), compensation and benefits, network operations expense (“Netops”), stock-based compensation expense, other expenses, and depreciation and amortization.

Netex consists of third-party network service costs resulting from our leasing of certain network facilities, primarily leases of circuits and dark fiber, from carriers to augment our owned infrastructure, for which we are generally billed a fixed monthly fee. Netex also includes colocation facility costs for rent and license fees paid to the landlords of the buildings in which our colocation business operates, along with the utility costs to power those facilities. While increases in demand for our services will drive additional operating costs in our business, consistent with our strategy of leveraging our owned infrastructure assets, we expect to primarily utilize our existing network infrastructure or build new network infrastructure to meet the demand. In limited circumstances, we will augment our network with additional circuits or services from third-party providers. Third-party network service costs include the upfront cost of the initial installation of such circuits. Such costs are included in operating costs in our consolidated statements of operations.

Compensation and benefits expenses include salaries, wages, incentive compensation and benefits. Employee-related costs that are directly associated with network construction, service installations and development of business support systems are capitalized and amortized to operating costs and expenses over the customer life. Compensation and benefits expenses related to the departments attributed to generating revenue are included in our operating costs line item while compensation and benefits expenses related to the sales, product, and corporate departments are included in our selling, general and administrative expenses line item of our consolidated statements of operations.

Netops expense includes all of the non-personnel related expenses of operating and maintaining our network infrastructure, including contracted maintenance fees, right-of-way costs, rent for cellular towers and other places where fiber is located, pole attachment fees, and relocation expenses. Such costs are included in operating costs in our consolidated statements of operations.

Our stock-based compensation expense contains two components, common unit awards classified as liabilities and, to a lesser extent, preferred unit awards classified as equity. For the CII common units granted to employees and directors, we recognize an expense equal to the fair value of all of those common units that vest during the period plus the change in fair value of previously vested units, and record a liability in respect of those amounts. When the CII preferred units are initially granted, we recognize no expense. We use the straight line method, over the vesting period, to amortize the fair value of those units, as determined on the date of grant. Subsequent changes in the fair value of the preferred units granted to members of management and directors do not affect the amount of expense we recognize. Stock-based compensation expense is included, based on the responsibilities of the awarded recipient, in either our operating costs or sales, general and administrative expenses in our consolidated statements of operations.

Other expenses include expenses such as property tax, franchise fees, colocation facility maintenance, travel, office expense and other administrative costs. Other expenses are included in both operating costs and selling, general and administrative expenses depending on their relationship to generating revenue or association with sales and administration.

Transaction costs include expenses associated with professional services (i.e. legal, accounting, regulatory, etc.) rendered in connection with acquisitions or disposals (including spin-offs), travel expense, severance expense incurred on the date of acquisition or disposal, and other direct expenses incurred that are associated with signed and/or closed acquisitions or disposals. Transaction costs are included in sales, general and administrative expenses in our consolidated statements of operations.

Refer to “Selected Historical Consolidated Financial Information” for additional financial information for the indicated periods.

Our total revenue increased by $118.8 million, or 12%, from $1,004.4 million for Fiscal 2013 to $1,123.2 million for Fiscal 2014. The increase in revenue was driven by our organic growth as well as the timing of our Fiscal 2013 and Fiscal 2014 acquisitions.

We estimate that we achieved an organic growth rate from Fiscal 2013 to Fiscal 2014 of approximately 6%. Our organic growth was driven by installs that exceeded churn over the course of both periods, resulting from continued strong demand for bandwidth infrastructure services broadly across our service territory and customer industry verticals. Further underlying revenue drivers included:

We estimate that the period-over-period acquisition-related revenue growth was approximately 6%. Multiple Fiscal 2013 and Fiscal 2014 acquisitions impacted revenue growth between the two periods. The six Fiscal 2013 acquisitions were completed at various times throughout the year, although the largest (AboveNet) closed on July 2, 2012 and was fully included in our annual results for the year ended June 30, 2014 and 2013 and therefore was not a contributor to the period-over-period acquisition growth. The other acquisitions were included in our results of operations for only part of Fiscal 2013 compared to their inclusion for all of Fiscal 2014. The five Fiscal 2014 acquisitions were completed on August 1, 2013, October 1, 2013, October 2, 2013, March 4, 2014, and May 16, 2014 and were included in our Fiscal 2014 results for approximately eleven, nine, nine, four, and one month(s), respectively. The Fiscal 2014 acquisitions represented smaller acquisitions of dark fiber and colocation-only providers, with the exception of Geo, which was a larger acquisition of a European-based dark fiber and wavelength services provider completed in the fourth quarter of Fiscal 2014.

Physical Infrastructure. Revenues from our Physical Infrastructure segment increased by $82.4 million, or 20%, from $413.0 million for Fiscal 2013 to $495.4 million for Fiscal 2014.

We estimate that organic revenue growth for the Physical Infrastructure segment was approximately 8% between the two comparative annual periods. Dark fiber is the largest Strategic Product Group within the segment and benefited from continuing growth in infrastructure demand. Our FTT and zColo products also contributed to the segment’s growth. Bookings of MRR and MAR for the year ended June 30, 2014 were $10.6 million (with a total contract value of approximately $1.3 billion), nearly double the $6.3 million in bookings for the prior annual period. Installs were $8.1 million for Fiscal 2014, compared to $6.5 million for the prior annual period. The monthly churn percentage decreased between the two periods from 0.9% to 0.8%. All of the Fiscal 2014 acquisitions impacted the Physical Infrastructure segment revenues as FiberLink (dark fiber) and CoreLink and CoreXchange (both colocation) were Physical Infrastructure-only businesses and Geo was primarily Physical Infrastructure (dark fiber).

Lit Services. Revenues from our Lit Services segment increased by $35.7 million, or 6%, from $570.5 million for Fiscal 2013 to $606.2 million for Fiscal 2014.

We estimate that organic revenue growth for the Lit Services segment was approximately 5%. Growth was strongest in the segment’s Ethernet and IP Strategic Product Groups, driven by customer demand and increased effectiveness in marketing these products. Wavelength revenue growth was dampened by churn, including price concessions we proactively offered in exchange for customer contract extensions. SONET is a legacy product, and its revenue declined between the two periods, consistent with our expectations. Bookings of MRR and MAR decreased slightly from $11.3 million to $11.1 million between the two periods, with a total contract value of approximately $420 million, for the year ended June 30, 2014. Installs were $11.5 million for the year ended June 30, 2014, compared to $11.8 million for the comparative annual period. The monthly churn percentage remained consistent at 1.7% for the two periods, resulting in total churn processed of $10.2 million compared to $9.6 million in the prior fiscal year. The Lit Services period-over-period revenue results were primarily influenced by the carryover impacts from the Fiscal 2013 acquisitions, as the Fiscal 2014 acquisitions mostly impacted the Physical Infrastructure segment.

Other. Revenue from our Other segment, consisting of Zayo Professional Services, increased by 1%, or $0.3 million, from $27.8 million for Fiscal 2013 to $28.1 million for Fiscal 2014. The increase was largely driven by a one-time equipment sale in the fourth quarter of Fiscal 2014. The Other segment represented approximately 3% of our total revenue.

The following table reflects the stratification of our revenues during these periods. The substantial majority of our revenue continued to come from recurring payments from customers under contractual arrangements.

Physical Infrastructure. Physical Infrastructure operating costs and expenses increased by $167.3 million, or 45%, from $374.6 million for Fiscal 2013 to $541.9 million for Fiscal 2014. The increase in operating costs and expenses was primarily a result of the acquisitions of CoreNAP, Corelink, Access, Fiberlink, CoreXchange, and Geo in Fiscal 2013 and Fiscal 2014.

Lit Services. Lit Services operating costs and expenses increased by $5.4 million, or 1%, from $497.5 million for Fiscal 2013 to $502.9 million for Fiscal 2014. The relatively flat operating costs and expenses in relation to the 6% increase in revenue for Lit Services was primarily due to realized network-related cost synergies related to our acquisitions, and, to a lesser extent, ongoing off-net circuit cost reduction projects.

Other. Other operating costs and expenses decreased by $1.9 million, or 8%, from $24.2 million for Fiscal 2013 to $22.3 million for Fiscal 2014. The reduction in other operating costs and expenses was primarily attributable to a reduction in MRR.

The table below sets forth the components of our operating costs and expenses during the years ended June 30, 2014 and 2013.

Netex. Our Netex increased by $4.5 million, or 3% from $145.9 million for Fiscal 2013 to $150.4 million for Fiscal 2014. The increase in Netex was primarily due to increased facility costs related to the colocation acquisitions completed in Fiscal 2013 and Fiscal 2014, partially offset by cost savings, as planned network related synergies were realized. Netex as a percentage of total revenue decreased from 15% to 13% as a result of cost reductions and because our incremental revenue typically has less third-party network service costs associated with it than the existing base of revenue.

Compensation and Benefits Expenses. Compensation and benefits expenses increased by $2.9 million, or 2%, from $123.4 million for Fiscal 2013 to $126.3 million for Fiscal 2014.

The increase in compensation and benefits reflected the increase in headcount during Fiscal 2014 to support our growing business, including certain employees retained from businesses acquired since June 30, 2013, and employer matching of employee 401(k) contributions beginning in the fourth quarter of Fiscal 2014. This was partially offset by a reduction in bonus payout as the average payout for the year ended June 30, 2013 was approximately 130% of target as compared to approximately 100% of target for the year ended June 30, 2014.

Netops. Netops expense increased by $10.5 million, or 9%, from $120.9 million for Fiscal 2013 to $131.4 million for Fiscal 2014. The increase principally reflected the growth of our network assets and the related expenses of operating that expanded network. Our total network route miles increased approximately 7% from 75,839 miles at June 30, 2013 to 80,860 miles at June 30, 2014.

Other Expenses. Other expenses increased by $1.7 million, or 3%, from $60.1 million for Fiscal 2013 to $61.8 million for Fiscal 2014. The increase was primarily the result of additional expenses attributable to our Fiscal 2013 and Fiscal 2014 acquisitions, which were partially offset by the receipt of $3.8 million in connection with an escrow settlement relating to the 360networks acquisition during the second quarter of Fiscal 2014.

Transaction Costs. Transaction costs decreased by $8.9 million, or 63%, from $14.2 million for Fiscal 2013 to $5.3 million for Fiscal 2014. The decrease was due to higher transaction-related costs in the first quarter of Fiscal 2013 associated with the AboveNet acquisition, partially offset by the transaction-related costs associated with the Geo and Neo acquisitions in Fiscal 2014.

Stock-Based Compensation. Stock-based compensation expense increased by $147.9 million, or 140%, from $105.8 million for Fiscal 2013 to $253.7 million for Fiscal 2014. The stock-based compensation expense associated with the common units is impacted by both the estimated value of the common units and the number of common units vesting during the period. The following table reflects the estimated fair value of the common units during the relevant periods impacting the stock-based compensation expense for the years ended June 30, 2014 and 2013.

Depreciation and amortization expense increased by $13.8 million, or 4%, from $324.5 million for Fiscal 2013 to $338.3 million for Fiscal 2014. The increase was primarily the result of depreciation related to capital expenditures since June 30, 2013 and acquisition-related growth.

The table below sets forth the components of our total other expenses, net for the years ended June 30, 2014 and 2013.

Interest Expense. Interest expense increased by $1.1 million, or 1%, from $202.4 million for Fiscal 2013 to $203.5 million for Fiscal 2014. The increase was primarily a result of additional interest expense related to the $150.0 million and $275.0 million add-ons to our Term Loan Facility during the second and fourth quarters of Fiscal 2014, respectively. Also contributing to the increase in interest expense was the impact of changes in market value of our interest rate swaps during the year ended June 30, 2014 as compared to the year ended June 30, 2013. The change in market value was additional interest expense of $4.7 million for the year ended June 30, 2014 as compared to a reduction in interest expense of $2.6 million for the year ended June 30, 2013, representing a year over year increase in interest expense of $7.3 million. These increases were partially offset by a decrease in interest expense resulting from the amendments to our Credit Agreement during the second and third quarters of Fiscal 2013 and second quarter of Fiscal 2014 to lower the interest rates on our Term Loan Facility and Revolver, in addition to quarterly principal payments on our Term Loan Facility, which reduced our outstanding debt obligations.

Loss on Extinguishment of Debt. In connection with the debt refinancing activities during Fiscal 2014, we recognized an expense of $1.9 million associated with debt extinguishment costs, including a cash expense of $0.9 million associated with the payment of third party costs and non-cash expenses of $1.0 million, consisting of $0.7 million associated with the write-off of unamortized debt issuance costs and $0.3 million associated with the write-off of the net unamortized discount on the extinguished debt balances.

In connection with the debt refinancing activities during the Fiscal 2013, we incurred an expense of $77.3 million associated with debt extinguishment costs, including a cash expense of $43.1 million associated with the payment of early redemption fees and other third party expenses on our previous indebtedness and non-cash expenses, including $34.2 million associated with the write-off of unamortized debt issuance costs and unamortized discounts.

Other Income, Net. Other income, net increased by $4.8 million, from $0.3 million for Fiscal 2013 to $5.1 million for Fiscal 2014. Other income, net consists primarily of unrealized foreign currency gain related to the re-measurement of intercompany loans between our domestic and foreign subsidiaries.

Income tax expense increased over the prior year by $61.5 million, from an income tax benefit of $24.2 million for Fiscal 2013 to an income tax expense of $37.3 million for Fiscal 2014. Our provision for

income taxes included both the current provision and a provision for deferred income tax expense resulting from timing differences between tax and financial reporting accounting bases. We were unable to apply our NOLs for application to the income of our subsidiaries in some states and thus our state income tax expense was higher than the expected blended rate. In addition, as a result of our stock-based compensation and certain transaction costs not being deductible for income tax purposes, our effective tax rate was higher than the statutory rate.

The following table reconciles an expected tax provision based on a statutory federal tax rate applied to our earnings before income tax to our actual provision for income taxes.

Our total revenue increased by $628.9 million, or 167%, from $375.5 million for Fiscal 2012 to $1,004.4 million for Fiscal 2013. The increase in revenue was driven primarily by our Fiscal 2012 and 2013 acquisitions and organic growth.

We estimate that we achieved an organic growth rate from Fiscal 2012 to Fiscal 2013 of approximately 6%. Our organic growth was driven by installs that exceeded churn in both periods, resulting from strong demand for bandwidth infrastructure services broadly across our geographic markets and customer verticals. Further underlying organic activity drivers during the period included:

We estimate that the period-over-period acquisition-related revenue growth was approximately 161%. The three Fiscal 2012 acquisitions were completed on December 1, 2011, December 31, 2011 and May 1, 2012 and therefore were included in our results of operations for seven, six and two months, respectively, in Fiscal 2012 compared to a full twelve months in Fiscal 2013. The most significant acquisition in Fiscal 2012 was 360networks. The acquisition of 360networks added substantial metro and regional network assets in the Western U.S. The six Fiscal 2013 acquisitions were completed at various times throughout the year with the largest, AboveNet, closing on July 2, 2012 and being included in our Fiscal 2013 results of operations for the entire twelve month period. The AboveNet acquisition significantly expanded our metro fiber assets in some of largest U.S. metro markets plus London, and provided important new customer relationships and product capabilities that we applied across our combined networks. The acquisition of AboveNet had the impact of more than doubling our previous revenue run rate.

Physical Infrastructure. Revenues from our Physical Infrastructure segment increased by $255.6 million, or 162%, from $157.4 million for Fiscal 2012 to $413.0 million for Fiscal 2013.

We estimate that organic revenue growth for the Physical Infrastructure segment was approximately 11%. This was influenced by the increasing importance of bandwidth for our customers (in volume and criticality), and, in select cases, reflects a shift from lit services to physical infrastructure products. This is evidenced by strong bookings and install activity on large FTT projects for many of the major wireless carriers. Bookings of MRR and MAR during Fiscal 2013 totaled $6.3 million (with a total contract value of $613 million), compared to $5.3 million in Fiscal 2012. Installs were $6.5 million in Fiscal 2013, an increase from $3.5 million in the prior year. The monthly churn percentage improved from 1.1% to 0.9% between the two years; however, total churn grew from $1.7 million to $3.8 million in Fiscal 2013 as a result of the larger base of revenue. The six Fiscal 2013 acquisitions were disproportionately weighted towards Physical Infrastructure products, and therefore acquisitions had a larger impact on this segment. Each of our Fiscal 2012 acquisitions were also heavily weighted towards Physical Infrastructure products.

Lit Services. Revenues from our Lit Services segment increased by $345.9 million, or 154%, from $224.6 million for Fiscal 2012 to $570.5 million for Fiscal 2013.

We estimate that organic revenue growth for the Lit Services segment was approximately 3%. This performance reflected higher churn related to proactively re-terming select Lit Services customer contracts in exchange for certain price concessions. Additionally, we experienced migration of select wavelength customers to dark fiber. Demand for Lit Services remained strong, as evidenced by $11.3 million of Fiscal 2013 bookings (totaling approximately $378 million in total contract value) compared to $3.2 million in Fiscal 2012. This growth was supported by new geographies and routes, as well as enhanced Ethernet and IP capabilities that were acquired through the AboveNet acquisition. Installs were in line with bookings in Fiscal 2013, totaling $11.8 million of MRR and MAR. The monthly churn percentage increased from 1.5% to 1.7% between the two periods, resulting in total churn processed of $9.6 million, compared to $3.3 million in the prior fiscal year. AboveNet’s large base of wavelength and Ethernet customers was the primary contributor to the Lit Services inorganic growth.

Other. Our Other segment, consisting of Zayo Professional Services, was a new addition in Fiscal 2013 through the acquisition of AboveNet. The Other segment represented approximately 3% of our total revenue in Fiscal 2013.

Physical Infrastructure. Physical Infrastructure operating costs and expenses increased by $263.9 million, or 238%, from $110.7 million for Fiscal 2012 to $374.6 million for Fiscal 2013. The increase in operating costs and expenses was primarily a result of the acquisitions of AboveNet, Fibergate, and First Telecom in Fiscal 2013.

Lit Services. Lit Services operating costs and expenses increased by $301.4 million, or 154%, from $196.1 million for Fiscal 2012 to $497.5 million for Fiscal 2013. The increase in operating costs and expenses was primarily a result of the acquisition of AboveNet in Fiscal 2013.

Other. Other operating costs and expenses increased by $24.2 million for Fiscal 2013 due to the addition of the ZPS strategic product group through the acquisition of AboveNet.

The table below sets forth the components of our operating costs and expenses during the years ended June 30, 2013 and 2012.

Netex. Our Netex increased by $63.8 million, or 78%, from $82.1 million for Fiscal 2012 to $145.9 million for Fiscal 2013. The increase in consolidated operating costs primarily related to our Fiscal 2012 and Fiscal 2013 acquisitions, and additional network costs incurred in order to support new customer contracts entered into subsequent to June 30, 2012. Netex as a percentage of total revenue decreased from 22% to 15% principally due to the shift in product mix (namely the increased percentage of dark fiber) associated with the July 2, 2012 acquisition of AboveNet. Also, as a result of the acquisition of AboveNet and its status as a Tier 1 settlement-free peering partner, we were able to eliminate IP transit costs that we previously incurred by the Company.

Compensation and Benefits Expenses. Compensation and benefits expenses increased by $75.6 million, or 158%, from $47.8 million for Fiscal 2012 to $123.4 million for Fiscal 2013.

The compensation and benefits increase reflects the increased number of employees resulting from the AboveNet acquisition and to a lesser extent employees hired during the year to support our growing business as well as employees retained from other Fiscal 2013 acquisitions. A majority of the increase to our headcount occurred on July 2, 2012 as a result of hiring certain former employees of AboveNet.

Netops Expense. Netops increased by $83.8 million, or 226%, from $37.1 million for Fiscal 2012 to $120.9 million for Fiscal 2013. The increase principally reflected the growth of our network assets and the related expenses of operating that expanded network. Our total network route miles increased approximately 63% from 46,504 miles at June 30, 2012 to 75,839 miles at June 30, 2013, primarily due to the acquisition of AboveNet. Also contributing to the increase was a one-time charge of $6.6 million related to lease termination costs associated with exit activities initiated for unutilized technical facilities space recognized during the fourth quarter of Fiscal 2013.

Other Expenses. Other expenses increased by $39.2 million, or 188%, from $20.9 million for Fiscal 2012 to $60.1 million for the Fiscal 2013. The increase was principally a result of additional expenses attributable to our Fiscal 2013 and Fiscal 2012 acquisitions. In addition, during the fourth quarter of Fiscal 2013, we recognized a one-time charge of $3.6 million related to lease termination costs associated with exit activities initiated for unutilized office space.

Transaction Costs. Transaction costs increased by $7.6 million, or 114%, from $6.6 million for Fiscal 2012 to $14.2 million for Fiscal 2013. This increase was primarily due to the AboveNet acquisition.

Stock-Based Compensation. Stock-based compensation expenses increased by $79.5 million, or 303%, from $26.3 million for Fiscal 2012 to $105.8 million for Fiscal 2013. The stock-based compensation expense associated with the common units was impacted by both the estimated value of the common units and the number

of common units vesting during the period. The following table reflects the estimated fair value of the common units during the relevant periods impacting the stock-based compensation expense for the years ended June 30, 2013 and 2012.

The increase in the value of the common units in the current period was primarily a result of our organic growth since June 30, 2012, cost synergies realized and expected to be realized from our prior acquisitions and a reduction to the discount rate utilized in the Company’s valuation of the common units resulting from our reduced financing costs.

We recognize changes in the fair value of the common units through increases or decreases in stock-based compensation expense and adjustments to the related stock-based compensation liability. The stock-based compensation liability associated with the common units was $159.3 million and $54.4 million as of June 30, 2013 and June 30, 2012, respectively. The liability was impacted by changes in the estimated value of the common units, number of vested common units, and distributions made to holders of the common units.

In December 2011, CII and the preferred unit holders of CII authorized a non-liquidating distribution to common unit holders of up to $10.0 million. The eligibility for receiving proceeds from the distribution was determined by the liquidation preference of the unit holder. Receiving proceeds from the authorized distribution was at the election of the common unit holder. As a condition of the early distribution, common unit holders electing to receive an early distribution received 85% of the amount that they would otherwise be entitled to receive if the distribution were in connection with a liquidating distribution. The common unit holders electing to receive the early distribution retained all of their common units and are entitled to receive future distributions only to the extent such future distributions are in excess of the non-liquidating distribution, excluding the 15% discount. During Fiscal 2012, $9.1 million was distributed to CII’s common unit holders. Common unit holders electing to receive the early distribution forfeited $1.6 million in previously recognized stock-based compensation, which was recorded as a reduction to the stock-based compensation liability during Fiscal 2012.

Depreciation and amortization expense increased by $239.5 million, or 282%, from $85.0 million for Fiscal 2012 to $324.5 million for Fiscal 2013. The increase was a result of the substantial increase to our property and equipment and intangible assets since June 30, 2012, principally a result of our Fiscal 2012 and Fiscal 2013 acquisitions and capital expenditures since June 30, 2012.

The table below sets forth the components of our total other expenses, net for the years ended June 30, 2013 and 2012.

Interest expense. Interest expense increased by $151.8 million, or 299%, from $50.7 million for Fiscal 2012 to $202.5 million for Fiscal 2013. The increase was a result of our increased indebtedness during Fiscal 2013 as compared to Fiscal 2012, partially offset by a decrease in our weighted-average interest rate from Fiscal 2012 to Fiscal 2013.

Loss on extinguishment of debt. In connection with the repayment of our previously existing term loan and revolver and redemption of our $350.0 million outstanding aggregate principal amount of previously issued notes in July 2012 (the “Debt Refinancing Activities”) and the subsequent re-pricing transactions completed during the second and third quarters of Fiscal 2013 related to our Term Loan Facility and Revolver (the “Second and Fourth Amendments”), we recorded a loss on extinguishment of debt totaling $77.3 million during Fiscal 2013. In connection with the Debt Refinancing Activities, discussed above, we recognized an expense of $65.0 million associated with debt extinguishment costs, including a cash expense of $39.8 million associated with the payment of early redemption fees on our previous indebtedness and non-cash expenses of $17.0 million associated with the write-off of our unamortized debt issuance costs and $8.1 million associated with the write off of the net unamortized discount on the extinguished debt balances. In connection with the Second and Fourth Amendments, we recognized a loss on extinguishment of debt of $12.3 million. The loss consisted of a cash expense of $2.0 million associated with the payment of an early call premium paid to certain creditors and other third party expenses and $10.3 million associated with the write-off of unamortized debt issuance costs and discounts.

Impairment of cost method investment. In connection with the October 1, 2010 acquisition of American Fiber Systems, we acquired an ownership interest in USCarrier. As of June 30, 2012, we owned 55% of the outstanding Class A membership units and 34% of the outstanding Class B membership units. On August 15, 2012, we entered into an agreement to acquire the remaining equity interest in USCarrier. As a result of certain disputes with the board of managers of USCarrier, we were unable to exercise control or significant influence over USCarrier’s operating and financial policies and as a result we accounted for this investment utilizing the cost method of accounting from the date of the AFS acquisition, at which time the investment was recorded at fair value, through June 30, 2012. Based upon the agreed upon purchase price of the remaining equity interests, we determined the fair value of our ownership interest in USCarrier as of June 30, 2012 to be $12.8 million and recognized an impairment of $2.2 million during the quarter ended June 30, 2012.

We recorded a benefit for income taxes of $24.2 million during Fiscal 2013 as compared to a provision for income taxes of $26.9 million during Fiscal 2012. Our provision for income taxes included both the current and deferred provision for income tax expense resulting from timing differences between tax and financial reporting accounting bases. We were unable to combine our net operating losses (“NOLs”) for application to the income of

our subsidiaries in some states and thus our state income tax expense was higher than the expected blended rate. During Fiscal 2013, we dissolved certain acquired legal entities, which resulted in the loss of state NOLs that were generated by those entities. The loss of these NOLs resulted in a decrease in the benefit for income taxes of $2.8 million for Fiscal 2013. In addition, as a result of our stock-based compensation and certain transaction costs not being deductible for income tax purposes, our effective tax rate was higher than the statutory rate. The following table reconciles our expected tax provision based on the statutory federal tax rate applied to our earnings before income taxes to our actual (benefit)/provision for income taxes:

We define Adjusted EBITDA as earnings from continuing operations before interest, income taxes, depreciation and amortization (“EBITDA”) adjusted to exclude acquisition or disposal-related transaction costs, losses on extinguishment of debt, stock-based compensation, unrealized foreign currency gains on an intercompany loan, and impairment of cost method investment. We use Adjusted EBITDA to evaluate operating performance, and this financial measure is among the primary measures used by management for planning and forecasting for future periods. We believe that the presentation of Adjusted EBITDA is relevant and useful for investors because it allows investors to view results in a manner similar to the method used by management and facilitates comparison of our results with the results of other companies that have different financing and capital structures.

Adjusted EBITDA results, along with other quantitative and qualitative information, are also utilized by management and our compensation committee for purposes of determining bonus payouts to employees.

Adjusted EBITDA has limitations as an analytical tool and should not be considered in isolation from, or as a substitute for, analysis of our results from operations and operating cash flows as reported under GAAP. For example, Adjusted EBITDA:

Our computation of Adjusted EBITDA may not be comparable to other similarly titled measures computed by other companies because all companies do not calculate Adjusted EBITDA in the same fashion.

Reconciliations from segment and consolidated Adjusted EBITDA to net (loss)/earnings are as follows:

Our primary sources of liquidity have been cash provided by operations, equity contributions, and incurrence of debt. Our principal uses of cash have been for acquisitions, capital expenditures, and debt service requirements. See “—Cash Flows,” below. We anticipate that our principal uses of cash in the future will be for acquisitions, capital expenditures, working capital, and debt service.

We have financial covenants under the Indentures governing our Notes and our Credit Agreement that, under certain circumstances, restrict our ability to incur additional indebtedness. The Indentures governing our Notes limit any increase in our secured indebtedness (other than certain forms of secured indebtedness expressly permitted under the Indentures) to a pro forma secured debt ratio of 4.5 times our previous quarter’s annualized modified EBITDA and limit our incurrence of additional indebtedness to a total indebtedness ratio of 5.25 times our previous quarter’s annualized modified EBITDA. The Credit Agreement similarly limits our incurrence of additional indebtedness. See Note 9—Long Term Debt—Debt Covenants to our audited consolidated financial statements for more information on our financial covenants.

As of June 30, 2014, we had $297.4 million in cash and cash equivalents and a working capital surplus of $200.1 million. Cash and cash equivalents consist of amounts held in bank accounts and highly-liquid U.S. treasury money market funds. Additionally, as of June 30, 2014, we had $243.6 million available under our Revolver.

Our capital expenditures, net of stimulus grants, increased by $37.6 million, or 12%, during the year ended June 30, 2014 as compared to the year ended June 30, 2013, from $323.2 million to $360.8 million, respectively. The increase in capital expenditures is a result of meeting the needs of our larger customer base resulting from our acquisitions and organic growth. We expect to continue to invest in our network for the foreseeable future. These capital expenditures, however, are expected to primarily be success-based; that is, in most situations, we will not invest the capital until we have an executed customer contract that supports the investment.

As part of our corporate strategy, we continue to be regularly involved in discussions regarding potential acquisitions of companies and assets. We expect to fund such acquisitions with cash from operations, debt (including available borrowings under our $250.0 million Revolver), equity contributions, and available cash on hand.

We believe that our cash flow from operating activities, in addition to cash and cash equivalents currently on-hand, will be sufficient to fund our operating activities and capital expenditures for the foreseeable future, and in any event for at least the next 12 to 18 months. Given the generally volatile global economic climate, no assurance can be given that this will be the case.

We regularly consider acquisitions and additional strategic opportunities, including large acquisitions, which may require additional debt or equity financing.

The following table sets forth the components of our cash flow for the years ended June 30, 2014, 2013, and 2012.

Net cash flows from operating activities increased by $161.6 million, or 40%, from $404.9 million to $566.5 million during Fiscal 2013 and Fiscal 2014, respectively.

Net cash flows from operating activities during the year ended June 30, 2014 represents the loss from continuing operations of $181.6 million, plus the add backs of non-cash items deducted in the determination of net loss, principally depreciation and amortization of $338.3 million, loss on extinguishment of debt of $1.9 million, stock-based compensation expense of $253.7 million, provision for bad debts of $1.9 million, additions to deferred revenue of $163.8 million, non-cash interest expense of $22.1 million and change in the deferred tax provision of $24.2 million, less amortization of deferred revenue of $55.6 million, minus the net change in working capital components.

Net cash flows from operating activities during the year ended June 30, 2013 represents the loss from continuing operations of $145.6 million, plus the add backs of non-cash items deducted in the determination of net loss, principally depreciation and amortization of $324.5 million, stock-based compensation expense of $105.8 million, losses on extinguishment of debt of $77.3 million, additions to deferred revenue of $61.7 million and non-cash interest expense of $12.3 million, less amortization of deferred revenue of $43.1 million and the change in deferred tax provision of $27.8 million, plus the net change in working capital components.

The increase in net cash flows from operating activities during the year ended June 30, 2014 as compared to the year ended June 30, 2013 is primarily a result of additional earnings from our organic growth, cost synergies realized from our acquisitions and interest expense savings from our refinancings.

Net cash flows from operating activities increased by $237.3 million, or 141%, from $167.6 million to $404.9 million during Fiscal 2012 and Fiscal 2013, respectively.

Net cash flows from operating activities during the year ended June 30, 2012 represents the loss from continuing operations of $9.9 million, plus the add backs of non-cash items deducted in the determination of net loss, principally depreciation and amortization of $85.0 million, stock-based compensation expense of

$26.3 million, provision for bad debts of $729, additions to deferred revenue of $55.0 million, non-cash interest expense of $4.8 million and the change in deferred tax provision of $28.4 million, less amortization of deferred revenue of $13.8 million, minus the change in working capital components.

The increase in net cash flows from operating activities during the year ended June 30, 2013 as compared to the year ended June 30, 2012 is primarily a result of additional earnings from our organic growth and cost synergies realized from our acquisitions.

We used cash in investing activities of $754.1 million, $2,804.0 million, and $475.4 million during the years ended June 30, 2014, 2013, and 2012, respectively.

During the year ended June 30, 2014, our principal uses of cash for investing activities were $360.8 million in additions to property and equipment, $0.3 million for Corelink, $40.1 million for the acquisition of Access, $43.1 million for the acquisition of FiberLink, $17.5 million for the acquisition of CoreXchange, and $292.3 million for the acquisition of Geo.

During the year ended June 30, 2013, our principal uses of cash for investing activities were $2,210.0 million for the acquisition of AboveNet, $118.3 million for the acquisition of FiberGate, $16.1 million for the acquisition of USCarrier, $109.7 million for the acquisition of First Telecom, $22.2 million for the acquisition of Litecast, $7.1 million for the acquisition of Core NAP, and $323.2 million in additions to property and equipment, net of stimulus grant reimbursements. Partially offsetting the net cash used in investing activities during the year ended June 30, 2013 was purchase consideration of $2.7 million returned from our acquisitions of MarquisNet and Arialink.

During the year ended June 30, 2012, our principal uses of cash for investing activities were $317.9 million for the acquisition of 360networks, $15.5 million for our acquisition of MarquisNet, $17.9 million for the acquisition of Arialink, and $124.1 million in additions to property and equipment, net of stimulus grant reimbursements.

Our net cash provided by financing activities was $392.7 million, $2,340.0 million and $433.1 million during the years ended June 30, 2014, 2013, and 2012, respectively.

Our cash flows from financing activities during the year ended June 30, 2014 primarily consist of $423.6 million from the proceeds from long-term debt offset by $18.0 million in principal payments on long-term debt obligations, $7.9 million in principal payments on capital leases, and $4.9 million in debt issuance costs during Fiscal 2014.

Our cash flows from financing activities during the year ended June 30, 2013 primarily consist of $3,189.3 million from the proceeds from long-term debt, $343.8 million in equity contributions from CII and $22.7 million in net transfers of cash out of restricted cash accounts. These cash inflows were partially offset by $83.1 million in debt issuance costs, $1,058.6 million in principal repayments on long-term debt obligations, $72.1 million in early redemption fees on debt extinguishments, and $1.9 million in principal payments on capital leases during Fiscal 2013.

Our cash flows from financing activities during the year ended June 30, 2012 consist of $335.6 million from the proceeds from long-term borrowings, and $134.8 million in equity contributions from CII. This cash inflow was partially offset by $11.7 million in debt issuance costs, $1.6 million in principal repayments on long-term debt obligations, $22.8 million in net transfers of cash to restricted cash accounts, and $1.2 million in principal payments on capital leases during Fiscal 2012.

The following table represents a summary of our estimated future payments under contractual cash obligations for continuing operations as of June 30, 2014. Changes in our business needs, cancellation provisions, changing interest rates and other factors may result in actual payments differing from these estimates. We cannot provide certainty regarding the timing and amounts of these future payments.

Our operating leases and purchase commitments include expected payments for our operating facilities, network services and capacity, communications equipment, and maintenance obligations. Our purchase commitments are primarily success-based, meaning that before we commit resources to expand our network, we have a signed customer contract that will provide us with an attractive return on the required capital. The contractual long-term debt payments, above, include an estimate of future interest expense based on the interest rates in effect on our floating rate debt obligations as of the most recent balance sheet date.

Cash payments for interest, net of capitalized interest, which are reflected in our cash flows from operating activities, during the year ended June 30, 2014 were $175.3 million and represent 31% of our cash flows from operating activities. We also made cash payments related to principal payments on our debt obligations of $25.9 million (exclusive of the impact of refinancing transactions), which are reflected in our cash flows from financing activities, and represent 5% of our cash flows from operating activities.

We do not have any special purpose or limited purpose entities that provide off-balance sheet financing, liquidity, or market or credit risk support and we do not engage in leasing, hedging, or other similar activities that expose us to any significant liabilities that are not reflected in our audited consolidated financial statements, or disclosed in Note 15—Commitments and Contingencies to our audited consolidated financial statements, or in the Future Contractual Obligations table included above.

On April 10, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-08—Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. The amendments in the ASU change the criteria for reporting discontinued operations for all public and nonpublic entities. The amendments also require new disclosures about discontinued operations and disposals of components of an entity that do not qualify for discontinued operations reporting. The ASU is effective prospectively for disposals (or classifications as held-for-sale) that occur within annual periods beginning on or after December 15, 2014, and interim periods within those annual periods, for public entities, with early adoption permitted for disposals (or classifications as held-for-sale) that have not been reported in financial statements previously issued or available for issuance. The Company has not yet adopted the guidance under this ASU.

On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for us on or after July 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. We are evaluating the effect that ASU 2014-09 will have on our consolidated financial statements and related disclosures. We have not yet selected a transition method nor have we determined the effect of the standard on our ongoing financial reporting.

This discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenue, expenses and related disclosures. We base our estimates on historical results which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate these estimates on an ongoing basis. Actual results may differ from these estimates under different assumptions or conditions.

We have accounting policies that involve estimates such as the allowance for doubtful accounts, revenue reserves, useful lives of long-lived assets, fair value of our common and preferred units issued as compensation, accruals for estimated tax and legal liabilities, accruals for exit activities associated with real estate leases, accruals for customer disputes and valuation allowance for deferred tax assets. We have identified the policies below, which require the most significant judgments and estimates to be made in the preparation of our consolidated financial statements, as critical to our business operations and an understanding of our results of operations.

We recognize revenue derived from leasing fiber optic telecommunications infrastructure and the provision of telecommunications and colocation services when the service has been provided and when there is persuasive evidence of an arrangement, the fee is fixed or determinable and collection of the receivable is reasonably assured. Taxes collected from customers and remitted to government authorities are excluded from revenue.

Approximately 97% of revenue is billed in advance on a fixed-rate basis. The remainder of revenue is billed in arrears on a transactional basis determined by customer usage. The Company often bills customers for upfront charges, which are non-refundable. These charges relate to down payments or prepayments for future services and are influenced by various business factors including how the Company and customer agree to structure the payment terms. If the upfront payment made by a customer provides no benefit to the customer beyond the contract term, the upfront charge is deferred and recognized as revenue ratably over the contract term. If the upfront payment provides benefit to the customer beyond the contract term, the charge is recognized as revenue over the estimated life of the customer relationship.

Revenue attributable to leases of dark fiber pursuant to IRUs are accounted for in the same manner as the accounting treatment for sales of real estate with property improvements or integral equipment. This accounting treatment typically results in the deferral of revenue for the cash that has been received and the recognition of revenue ratably over the term of the agreement (generally up to 20 years).

Revenue is recognized at the amount expected to be realized, which includes billing and service adjustments. During each reporting period, we make estimates for potential future sales credits to be issued in respect of current revenue, related to service interruptions and customer disputes, which are recorded as a reduction in revenue. We analyze historical credit activity when evaluating our credit reserve requirements. We reserve for known service interruptions as incurred. We review customer disputes and reserve against those we believe to be valid claims. The determination of the customer dispute credit reserve involves significant judgment, estimations and assumptions.

We defer recognition of revenue until cash is collected on certain components of revenue, principally contract termination charges and late fees.

We estimate the ability to collect our receivables by performing ongoing credit evaluations of our customers’ financial condition, and provide an allowance for doubtful accounts based on expected collection of our receivables. Our estimates are based on assumptions and other considerations, including payment history, credit ratings, customer financial performance, industry financial performance and aging analysis.

We account for our stock-based compensation in accordance with the provisions of ASC 718—Compensation: Stock Compensation, which requires stock compensation to be recorded as either liability or equity awards based on the terms of the grant agreement. The CII common units granted to employees were considered to be stock-based compensation with terms that required the awards to be classified as liabilities due to cash settlement features. As such, we accounted for these awards as a liability and re-measured the liability to its fair value at each reporting date until the date of settlement, which requires the use of significant judgments and estimates. At each reporting period, we adjust the value of the vested portion of our liability awards to their fair value. The preferred units of CII granted to certain employees and directors were considered to be stock-based compensation with terms that required the awards to be classified as equity. As such, we accounted for these awards as equity, which required us to determine the fair value of the award on the grant date and amortize the related expense over the vesting period of the award.

We used a third party valuation firm to assist in the valuation of the CII common units at each reporting period and the CII preferred units when granted. In developing a value for these units, a two-step valuation approach was used. In the first step, we estimated the value of our equity through an analysis of valuations associated with various future potential liquidity scenarios. The second step involved allocating these values across our capital structure. The valuation was conducted in consideration of the guidance provided in the American Institute of Certified Public Accountants (“AICPA”) Practice Aid “Valuation of Privately-Held Company Equity Securities Issued as Compensation” and with adherence to the Uniform Standards of Professional Appraisal Practice set forth by the Appraisal Foundation.

We allocate value to each class of stock using the Probability Weighted Expected Return Method (“PWERM”). The unit value was based on a probability-weighted present value of expected future proceeds to our shareholders, considering each potential liquidity scenario available to us as well as preferential rights of each security. The potential scenarios that we considered within the PWERM framework were remaining a private company with the same ownership, a sale or merger, and an initial public offering (“IPO”). The PWERM utilizes a variety of assumptions regarding the likelihood of a certain scenario occurring, if the event involves a transaction, the potential timing of such an event, and the potential valuation that each scenario might yield.

We more heavily weighted the valuation estimate associated with an IPO as compared to remaining a private entity with the same ownership, with the least weight applied to the company sale assumption.

Within the PWERM framework, management also considered various liquidation possibilities, including an IPO and a sale or merger. In each of these scenarios, a distribution is established around the estimated exit dates

and valuations of each scenario. Future valuation figures are based upon corresponding market data for comparable companies in comparable scenarios. These include publicly-traded valuation statistics and acquisition valuation statistics for comparable companies in the IPO scenario and sale/merger scenario, respectively. Valuation statistics are combined with expectations regarding our future economic performance to produce future valuation estimates. Estimates are then discounted to the present using our estimated cost of equity as the discount rate.

In the scenario where the Company remains private, or status quo scenario, we estimated our total equity value using a discounted cash flow approach, which involved developing a projected free cash flow, estimating an appropriate risk adjusted present value discount rate, calculating the present value of our projected free cash flows, and calculating a terminal value. There were several inputs that were required to develop an estimate of the enterprise value under the status quo scenario, including forecasted earnings, discount rate, and the terminal multiple and/or the capitalization factor. We have developed a forecast of our revenues and EBITDA through June 30, 2019. Our forecasted revenues and EBITDA are based on our business operations as of the balance sheet date. If a material acquisition has occurred or has a high probability of occurring subsequent to the balance sheet date, the forecast utilized in the valuation reflects the pro forma results of operations of the combined entities. The next step in the income approach was to estimate a discount rate that most appropriately reflected our cost of capital, which we estimated to be 10.53% as of June 30, 2014. In determining this discount rate, we utilized a weighted average cost of capital (“WACC”) utilizing the Capital Asset Pricing Model (“CAPM”) build-up method. This method derived the cost of equity in part from the volatility (risk) statistics suggested by the Guideline Public Companies in the form of their five year historical betas. We included certain incremental risk premiums specific to us to account for the fact that we have historically depended on outside investment to operate and have a history of substantial volatility in earnings and cash flows. Based on our projections and estimated discount rate, we calculated the present value of our future cash flows. In order to estimate the enterprise value, we added to the estimated discounted cash flows an estimated terminal value. The H-Model reflected us as a going concern after the projection period by assuming that free cash flows grow at a supernormal rate starting in July 2019 and linearly taper to a long-term growth rate consistent with estimated inflation over a period of five years. These assumptions were used to construct a capitalization factor that was applied directly to the terminal year free cash flow, producing a terminal value specific to the H-Model Method. Both terminal values were converted into a present value through discounting by our WACC. The terminal value was estimated utilizing the “H-Model” method and “Observed Market Multiple” method. Next, the Observed Market Multiple method assumed we would be sold at the end of the forecast period. To develop a terminal multiple, we observed prevailing valuations associated with the Guideline Public Companies and the acquisitions of Guideline Public Companies. A terminal EBITDA multiple was selected to calculate the terminal value under this methodology. After adding the present value of free cash flows and terminal value for each scenario, we weighted the H-Model method at 75% and the Observed Market Multiple method at 25% to calculate a final enterprise value under the status quo scenario.

Based on these scenarios, management calculated the probability-weighted expected return to all of the equity holders. The resulting enterprise valuation was then allocated across our capital structure. Upon a liquidation of CII, or upon a non-liquidating distribution, the holders of common units would share in the proceeds after the CII preferred unit holders received their unreturned capital contributions and their priority return (6% per annum). After the preferred unreturned capital contributions and the priority return were satisfied, the remaining proceeds were allocated on a scale ranging from 85% to the Class A preferred unit holders and 15% to the common unit holders to 80% to the preferred unit holders and 20% to the common unit holders depending upon the return multiple to the preferred unit holders, also known as a waterfall allocation.

The value attributable to each class of shares was then discounted in order to account for the lack of marketability of the units. In determining the appropriate lack of marketability discount, we evaluated both empirical and theoretical approaches to arrive at a composite range that we believed indicated a reasonable spectrum of discounts for each of the valuation techniques utilized. The empirical methods we evaluated relied on datasets procured from observed transactions in interests in the public domain that are perceived to

incorporate pricing information related to the marketability (or lack thereof) of the interest itself. These empirical methods included IPO Studies and Restricted Stock Studies. Theoretical models utilized in our analysis formed the primary basis for the discount for lack of marketability, and included the Finnerty Average-Strike Put, the Asian Protective Put and the Black-Scholes-Merton Protective Put.

The following table reflects the estimated value of the Class A, B, C D, E, F, G, H, I, J, and K common units and ZPS Class A common units as of June 30, 2014, 2013, 2012:

Determining the fair value of share-based awards at the grant date and subsequent reporting dates required judgment. If actual results differ significantly from these estimates, stock-based compensation expense and the Company’s results of operations could be materially impacted.

We record property and equipment acquired in connection with a business combination at their estimated fair values on the acquisition date. See “—Critical Accounting Policies and Estimates: Acquisitions—Purchase Price Allocation.” Purchases of property and equipment are stated at cost, net of depreciation. Major improvements are capitalized, while expenditures for repairs and maintenance are expensed when incurred. Costs incurred prior to a capital project’s completion are reflected as construction-in-progress and are part of network infrastructure assets. Depreciation begins once the property and equipment is available and ready for use. Certain internal direct labor costs of constructing or installing property and equipment are capitalized. Capitalized direct labor reflects a portion of the salary and benefits of certain field engineers and other employees that are directly related to the construction and installation of network infrastructure assets. We have contracted with third party contractors for the construction and installation of the majority of our fiber network. Depreciation and amortization is provided on a straight-line basis over the estimated useful lives of the assets, with the exception of leasehold improvements, which are amortized over the lesser of the estimated useful lives or the term of the lease.

We perform periodic internal reviews to estimate useful lives of our property and equipment. Due to rapid changes in technology and the competitive environment, selecting the estimated economic life of telecommunications property and equipment requires a significant amount of judgment. Our internal reviews take into account input from our network services personnel regarding actual usage, physical wear and tear, replacement history, and assumptions regarding the benefits and costs of implementing new technology that factor in the need to meet our financial objectives.

When property and equipment is retired or otherwise disposed of, the cost and accumulated depreciation is removed from the accounts, and resulting gains or losses are reflected in operating income.

From time to time, we are required to replace or re-route existing fiber due to structural changes such as construction and highway expansions, which is defined as a “relocation.” In such instances, we fully depreciate the remaining carrying value of network infrastructure removed or rendered unusable, and capitalize the new fiber and associated construction costs of the relocation placed into service, which is reduced by any reimbursements received for such costs. To the extent that the relocation does not require the replacement of components of our network and only involves the act of moving our existing network infrastructure, as-is, to another location, the related costs are expensed as incurred.

Interest costs are capitalized for all assets that require a period of time to get them ready for their intended use. This policy is based on the premise that the historical cost of acquiring an asset should include all costs necessarily incurred to bring it to the condition and location necessary for its intended use. In principle, the cost incurred in financing expenditures for an asset during a required construction or development period is itself a part of the asset’s historical acquisition cost. The amount of interest costs capitalized for qualifying assets is determined based on the portion of the interest cost incurred during the assets’ acquisition periods that theoretically could have been avoided if expenditures for the assets had not been made. The amount of interest capitalized in an accounting period is calculated by applying the capitalization rate to the average amount of accumulated expenditures for the asset during the period. The capitalization rates used to determine the value of interest capitalized in an accounting period is based on our weighted average effective interest rate for outstanding debt obligations during the respective accounting period.

We periodically evaluate the recoverability of our long-lived assets and evaluate such assets for impairment whenever events or circumstances indicate that the carrying amount of such assets may not be recoverable. Impairment is determined to exist if the estimated future undiscounted cash flows are less than the carrying value of such assets. We consider various factors to determine if an impairment test is necessary. The factors include: consideration of the overall economic climate, technological advances with respect to equipment, our strategy, and capital planning. Since our inception, no event has occurred nor has there been a change in the business environment that would trigger an impairment test for our property and equipment assets.

Deferred tax assets arise from a variety of sources, the most significant being: tax losses that can be carried forward to be utilized against taxable income in future years; and expenses recognized in our income statement but disallowed in our tax return until the associated cash flow occurs.

We record a valuation allowance to reduce our deferred tax assets to the amount that is expected to be recognized. The amount of deferred tax assets recorded on our consolidated balance sheets is influenced by management’s assessment of our future taxable income with regard to relevant business plan forecasts, the reversal of deferred tax balances, and reasonable tax planning strategies. At each balance sheet date, existing assessments are reviewed and, if necessary, revised to reflect changed circumstances. In a situation where recent losses have been incurred, the relevant accounting standards require convincing evidence that there will be sufficient future taxable income.

In connection with several of our acquisitions, we have acquired significant net operating loss carryforwards (“NOLs”). The Tax Reform Act of 1986 contains provisions that limit the utilization of NOLs if there has been an “ownership change” as described in Section 382 of the Internal Revenue Code.

Upon acquiring a company that has NOLs, we prepare an assessment to determine if we have a legal right to use the acquired NOLs. In performing this assessment we follow the regulations within the Internal Revenue Code Section 382: Net Operating Loss Carryovers Following Changes in Ownership. Any disallowed NOLs acquired are written-off in purchase accounting.

A valuation allowance is required for deferred tax assets if, based on available evidence, it is more-likely-than-not that all or some portion of the asset will not be realized due to the inability to generate sufficient taxable income in the period and/or of the character necessary to utilize the benefit of the deferred tax asset. When evaluating whether it is more-likely-than-not that all or some portion of the deferred tax asset will not be realized, all available evidence, both positive and negative, that may affect the realizability of deferred tax assets is identified and considered in determining the appropriate amount of the valuation allowance. We continue to monitor our financial performance and other evidence each quarter to determine the appropriateness of our valuation allowance. If we are unable to meet our taxable income forecasts in future periods we may change our conclusion about the appropriateness of the valuation allowance which could create a substantial income tax expense in our consolidated statement of operations in the period such change occurs.

As of June 30, 2014, we had a cumulative federal (U.S.) NOL carryforward balance of $1,110.0 million. During the year ending June 30, 2014, we utilized $297.2 million of NOL carryforwards to offset future taxable income. During the year ending June 30, 2013, we generated $91.0 million of NOL carryforwards that are available to offset future taxable income and we added $1,008.8 million to our NOL carryforward balance as a result of NOL carryforwards acquired from the AboveNet acquisition. Our NOL carryforwards, if not utilized to reduce taxable income in future periods, will expire in various amounts beginning in 2020 and ending in 2032. As a result of Internal Revenue Service regulations, we are currently limited to utilizing a maximum of $614.0 million of acquired NOL carryforwards during Fiscal 2014; however, to the extent that we do not utilize $614.0 million of our acquired NOL carryforwards during a fiscal year, the difference between the $614.0 million maximum usage and the actual NOLs usage is carried over to the next calendar year. Of our $1,110.0 million NOL carryforwards balance, $938.6 million of these NOL carryforwards were acquired in acquisitions. The deferred tax assets recognized at June 30, 2014 have been based on future profitability assumptions over a five-year horizon.

The analysis of our ability to utilize our NOL balance is based on our forecasted taxable income. The forecasted assumptions approximate our best estimates, including market growth rates, future pricing, market acceptance of our products and services, future expected capital investments, and discount rates. Although our forecasted income includes increased taxable earnings in future periods, flat earnings over the period in which our NOL carryfowards are available would result in full utilization of our current unreserved NOL carryforwards.

We review goodwill and indefinite-lived intangible assets for impairment at least annually in April, or more frequently if a triggering event occurs between impairment testing dates.

Intangible assets arising from business combinations, such as acquired customer contracts and relationships (collectively “customer relationships”), are initially recorded at fair value. We amortize customer relationships primarily over an estimated life of ten to twenty years using the straight-line method, as this method approximates the timing in which we expect to receive the benefit from the acquired customer relationship assets. Goodwill represents the excess of the purchase price over the fair value of the net identifiable assets acquired in a business combination.

Our impairment assessment begins with a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. The qualitative assessment includes comparing the overall financial performance of the reporting units against the planned results used in the last quantitative goodwill impairment test. Additionally, each reporting unit’s fair value is assessed in light of certain events and circumstances, including macroeconomic conditions, industry and market considerations, cost factors, and other relevant entity- and reporting unit-specific events. If it is determined under the qualitative assessment that it is more likely than not that the fair value of a reporting unit is less than its carrying value, then a two-step quantitative impairment test is performed. Under the first step, the estimated fair value of the reporting unit is compared with its carrying value (including goodwill). If the fair value of the reporting unit exceeds its carrying value, step two does not need to be performed. If the estimated fair value of the reporting unit is less than its carrying value, an indication of goodwill impairment exists for the reporting unit and the enterprise must perform step two of the impairment test (measurement). Under step two, an impairment loss is recognized for any excess of the carrying amount of the reporting unit’s goodwill over the implied fair value of that goodwill. The implied fair value of goodwill is determined by allocating the fair value of the reporting unit in a manner similar to a purchase price allocation in acquisition accounting. The residual fair value after this allocation is the implied fair value of the reporting unit goodwill. Fair value of the reporting unit under the two-step assessment is determined using a discounted cash flow analysis. The selection and assessment of qualitative factors used to determine whether it is more likely than not that the fair value of a reporting unit exceeds the carrying value involves significant judgments and estimates.

Intangible assets with finite useful lives are amortized over their respective estimated useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. We recorded no impairment charges for goodwill or intangibles during the years ended June 30, 2012, 2013, or 2014.

We apply the acquisition method of accounting to account for business combinations. The cost of an acquisition is measured as the aggregate of the fair values at the date of exchange of the assets given, liabilities incurred, and equity instruments issued. Identifiable assets, liabilities, and contingent liabilities acquired or assumed are measured separately at their fair value as of the acquisition date. The excess of the cost of the acquisition over our interest in the fair value of the identifiable net assets acquired is recorded as goodwill. If our interest in the fair value of the identifiable net assets acquired in a business combination exceeds the cost of the acquisition, a gain is recognized in earnings on the acquisition date only after we have reassessed whether we have correctly identified all of the assets acquired and all of the liabilities assumed.

For certain of our larger acquisitions, we engage outside appraisal firms to assist in the fair value determination of identifiable intangible assets such as customer relationships, tradenames, property and equipment and any other significant assets or liabilities. We adjust the preliminary purchase price allocation, as necessary, after the acquisition closing date through the end of the measurement period (up to one year) as we finalize valuations for the assets acquired and liabilities assumed.

The determination and allocation of fair values to the identifiable assets acquired and liabilities assumed is based on various assumptions and valuation methodologies requiring considerable management judgment. The most significant variables in these valuations are discount rates, terminal values, the number of years on which to base the cash flow projections, and the assumptions and estimates used to determine cash inflows and outflows or other valuation techniques (such as replacement cost). We determine which discount rates to use based on the risk inherent in the related activity’s current business model and industry comparisons. Terminal values are based on the expected life of products, forecasted life cycle, and forecasted cash flows over that period. Although we believe that the assumptions applied in the determination are reasonable based on information available at the date of acquisition, actual results may differ from the estimated or forecasted amounts, and the difference could be material.

Our exposure to market risk consists of changes in interest rates from time to time and market risk arising from changes in foreign currency exchange rates that could impact our cash flows and earnings.

As of June 30, 2014, we had outstanding approximately $750.0 million Senior Secured Notes, $500.0 million Senior Unsecured Notes, a balance of $1,990.1 million on the Term Loan Facility and $25.3 million of capital lease obligations. As of June 30, 2014, we had $243.6 million available for borrowing under the Revolver.

Based on current market interest rates for debt of similar terms and average maturities and based on recent transactions, we estimate the fair value of the Notes to be $1,294.8 million as of June 30, 2014. The Senior Secured Notes and Senior Unsecured Notes accrue interest at fixed rates of 8.125% and 10.125%, respectively.

Both the Revolver and the Term Loan Facility accrue interest at floating rates subject to certain conditions. As of June 30, 2014, the applicable interest rate on the Revolver was 3.0% and the rate on the Term Loan Facility was 4.0%. A hypothetical increase in the applicable interest rate on the Term Loan Facility of one percentage point would increase our annual interest expense by 0.23% or $4.6 million because the applicable interest rate as of June 30, 2014 was below the Credit Agreement’s 1.0% LIBOR floor. A hypothetical increase of one percentage point above the LIBOR floor would increase our annual interest expense by approximately $20.1 million before considering the offsetting effects of our interest rate swaps.

In August 2012, we entered into interest rate swap agreements with an aggregate notional value of $750.0 million and a maturity date of June 30, 2017. The contract states that we pay a 1.67% fixed rate of interest for the term of the agreement, beginning June 30, 2013. The counterparties pay to us the greater of actual LIBOR or 1.25%. We entered into the swap arrangements to reduce the risk of increased interest costs associated with potential future increases in LIBOR rates. A hypothetical increase in LIBOR rates of 100 basis points would increase the fair value of our interest rate swaps by approximately $15.2 million.

We are exposed to the risk of changes in interest rates if it is necessary to seek additional funding to support the expansion of our business and to support acquisitions. The interest rate that we may be able to obtain on future debt financings will be dependent on market conditions.

We have exposure to market risk arising from foreign currency exchange rates, primarily as it relates to the British pound. During the years ended June 30, 2013 and June 30, 2014, our foreign activities accounted for 5.7% and 6.3% of our consolidated revenue, respectively. Due to the strengthening of the British pound compared to the U.S. dollar, the average translation rate for the year ended June 30, 2014 increased 3.6%.

We monitor foreign markets and our commitments in such markets to assess currency and other risks. To date, we have not entered into any hedging arrangement designed to limit exposure to foreign currencies. Because of our European expansion related to the AboveNet acquisition completed during Fiscal 2013, our level of foreign activities is expected to increase and if it does, we may determine that such hedging arrangements would be appropriate and will consider such arrangements to minimize our exposure to foreign exchange risk.

We are a bandwidth infrastructure provider, and our services are a critical component of the broader $2 trillion global communications industry. Bandwidth infrastructure, consisting primarily of fiber networks and interconnect-oriented colocation facilities, plays a fundamental role in the communications value chain, similar to other types of infrastructure such as datacenters and cellular towers. Bandwidth infrastructure assets are a critical resource, connecting datacenters, cellular towers, and other carrier and private networks to support the substantial growth in global data, voice and video consumption by both business and individual consumers.

Our industry has changed substantially over the past 16 years. The first phase of the bandwidth infrastructure industry occurred with the advent of the Internet and the ensuing dot com era in the late 1990s. This led to the first major wave of fiber network deployments as a number of companies of varying backgrounds invested billions of dollars in fiber network construction throughout the U.S. and Europe. These fiber network developers included companies with national and international plans (e.g., Level 3 Communications, Qwest Communications, Williams Communications) and more regional plans (e.g., 360networks, Progress Telecom, OnFiber). Following these network builds, many of the fiber companies struggled in the early 2000s due to the lack of sufficient demand for their high-bandwidth services. Bandwidth demand during this timeframe was limited by the fact that many bandwidth-intensive applications (e.g. streaming video, cloud, mobile broadband, big data analytics, etc.) were either not yet contemplated or still very early in their life cycle. Instead, the majority of traffic at the time was low-bandwidth services such as voice and dial-up modem connections. In addition, the similarity of the fiber routes deployed resulted in significant overcapacity and associated pricing pressure, leaving a “last mile” gap and heavy competition and overcapacity along these routes. These two primary factors combined to significantly limit the fiber network providers’ operating cash flows, resulting in the majority of these companies transitioning their business models, consolidating and/or seeking bankruptcy protection.

In the following years, a substantial expansion in computing power and bandwidth-intensive applications drove meaningful bandwidth traffic growth. This growth highlighted the need to address the “last mile” gap by bringing bandwidth capacity directly to both the consumer and business end user. The capacity and performance of the consumer last mile connection was primarily addressed by the expansion of cable networks and through mobile network development by wireless carriers (supported by cellular tower operators). The growing bandwidth demand of business end users was addressed by a number of focused fiber developers constructing new networks to directly connect to datacenters, cellular towers, government facilities, schools, hospitals and other locations with high-bandwidth needs. These fiber network companies were generally local or regional in nature, and were most often either survivors of the initial fiber development wave, subsidiaries of a utility parent, or owned by entrepreneurs. This period is also noted for increased financial discipline following the large speculative capital deployments of the dot com era. This is the timeframe and industry environment in which Zayo was founded.

The acceleration in the development of bandwidth-intensive devices and applications has resulted in a significant need to further fill in the “last mile” gap, leading to substantial capital investments in fiber networks by bandwidth infrastructure providers. Bandwidth infrastructure service providers support applications such as high definition television broadcasting and video; online streaming video (Sandvine found that streaming video providers represent over 50% of North American downstream Internet traffic during peak hours); cloud applications replacing in-house enterprise software platforms (RightScale Inc. found that over 90% of organizations are running applications or experimenting with infrastructure-as-a-service); and explosive mobile data consumption (Cisco found that, in 2013, global mobile data traffic grew 81% and was nearly 18 times the

size of the entire global Internet in 2000). Companies whose services require large amounts of bandwidth and enterprises that consume large amounts of bandwidth are struggling to adapt to this rapidly evolving landscape, and the bandwidth infrastructure industry is growing in economic importance as it addresses this critical need. In addition to these demand trends, there has been significant consolidation amongst the bandwidth infrastructure services providers, validating a core tenet of Zayo’s founding investment thesis. This has been most pronounced amongst fiber providers in the U.S., with over 60 transactions within the past 10 years (approximately half of which have been consummated by us), and to a lesser degree in Europe.

We view the participants in today’s communications industry in two distinct categories:

The proliferation of smart devices and mobile broadband, real-time streaming video, social networks, online gaming, machine-to-machine connectivity, big data analytics, and cloud computing will continue to drive substantial consumer and business demand for bandwidth. As an example, while video streaming traffic represents 50% of peak hour downstream Internet traffic, Nielsen found that online viewing still only represents approximately 5% of the time viewers spend watching traditional TV, highlighting the significant potential demand and need for bandwidth. The Vertical Systems Group estimated that in 2013 61% of the U.S. enterprise buildings with 20 or more employees lacked fiber access facilities. Cisco estimates that, from 2013 to 2018,

mobile data traffic will grow at an annual rate of 61% and that IP traffic will grow at an annual rate of 21% through 2018. Additionally, according to Gartner in its November 18, 2013 report, Forecast: The Internet of Things, Worldwide, 2013, “[t]he installed base of ‘things,’ excluding PCs, tablets and smartphones, will grow to 26 billion units in 2020, which is almost a 30-fold increase from 0.9 billion units in 2009.”

Communications service providers develop and deliver value-added solutions that are tailored to mass market residential and enterprise customers whose needs continue to grow and evolve as bandwidth trends expand. Given this rapid growth and the complexity and cost of building and maintaining networks, communications service providers are increasingly looking to bandwidth infrastructure providers to augment the reach and performance of their own networks and support the delivery of the services their customers demand. As this dynamic continues, bandwidth infrastructure providers will become further entrenched as mission-critical partners to the communications service providers.

Similarly, end users such as private enterprises (e.g., media/content providers, financial institutions, and hospital systems) and public sector entities (e.g., governmental agencies and school districts) have experienced significant growth and change in the role that bandwidth plays within their organizations. As these needs continue to grow in both volume and criticality, end users will increasingly choose to directly procure bandwidth infrastructure services in order to gain more security, control and scale in their internal network operations. An example of this disintermediation is the trend of large school districts, adapting to e-education requirements, directly purchasing dark fiber as a replacement to more value-added solutions. We believe that as these dynamics play out across all industries, the number of end users directly seeking bandwidth infrastructure services will continue to expand.

By focusing on the reach, density, and performance of their physical networks, bandwidth infrastructure providers can deliver customized services to communications service providers and end users more quickly and with superior economics than these users could otherwise self-provide. Whether providing fiber connectivity to a wireless provider’s towers to enable mobile broadband, supplying a national communications service provider with a metro fiber footprint in new markets, providing a lit bandwidth connection to multiple enterprise datacenters for an industrial company, providing interconnection capabilities to a hosting company within a datacenter, or solving for the next society-impacting innovation, bandwidth infrastructure providers will continue to invest in and expand their infrastructure assets to meet this growing demand.

Given the natural economies of scale, there has been significant consolidation among bandwidth infrastructure providers, particularly in the U.S. We believe this consolidation trend will continue in the U.S. and is beginning in Europe. Combined with the barriers to new entrants, we foresee a decreasing number of bandwidth infrastructure providers against a backdrop of continued strong demand for their services.

allocation and financial performance with the ultimate goal of maximizing equity value for our stockholders. Our core values center on partnership, alignment, and transparency with our three primary constituent groups—employees, customers, and stockholders.

We were founded in 2007 with the investment thesis of building a bandwidth infrastructure platform to take advantage of the favorable Internet, data, and wireless growth trends driving the demand for bandwidth infrastructure, and to be an active participant in the consolidation of the industry. The growth of cloud-based computing, video, mobile and social media applications, machine-to-machine connectivity, and other bandwidth-intensive applications continues to drive rapidly increasing consumption of bandwidth on a global basis. Cisco estimates that, from 2013 to 2018, mobile data traffic will grow at an annual rate of 61% and that IP traffic will grow at an annual rate of 21% through 2018. Additionally, according to Gartner in its November 18, 2013 report, Forecast: The Internet of Things, Worldwide, 2013, “[t]he installed base of ‘things,’ excluding PCs, tablets and smartphones, will grow to 26 billion units in 2020, which is almost a 30-fold increase from 0.9 billion units in 2009.” As an early believer in the enduring nature of these trends, we assembled our asset base and built a business model specifically to provide high-bandwidth connectivity to customers whose businesses depend most on the continuous and growing demand for bandwidth. As a core tenet of our strategy for capitalizing on these industry trends, we have been a leading industry consolidator and have acquired 32 bandwidth infrastructure businesses and assets to date. Our owned, secure, and redundant fiber network and datacenters serve as the foundation for our bandwidth solutions and allow us to offer customers both physical infrastructure and lit services. We believe the continuous demand for additional bandwidth from service providers, enterprises and consumers, combined with our unique and dense metro, regional, and long-haul networks, position us as a mission-critical infrastructure supplier to the largest users of bandwidth.

Our network footprint includes both large and small metro geographies, the extended suburban regions of many cities, and the large rural, national and international links that connect our metro networks. We believe that our network assets would be difficult to replicate given the geographic reach, network density, and capital investment required. Our fiber networks span over 81,000 route miles and 6,000,000 fiber miles (representing an average of 74 fibers per route), serve 319 geographic markets in the United States and Europe, and connect to 15,764 buildings, including 4,200 cellular towers and 756 datacenters. We own fiber networks in over 300 metro markets, including large metro areas, such as New York, Chicago, San Francisco, Paris, and London, as well as smaller metro areas, such as Allentown, Pennsylvania, Fargo, North Dakota, and Spokane, Washington. Our networks allow us to provide our high-bandwidth infrastructure services to our customers over redundant fiber facilities between key customer locations. We own approximately 94% of our fiber miles, the remainder of which are operated by us under long-term IRU contracts with an average remaining contract term of over 9 years. We believe our ownership and the location and density of our expansive network footprint allow us to more competitively service our target customers’ bandwidth infrastructure needs at the local, regional, national, and international level relative to other regional bandwidth infrastructure service providers or long-haul carriers. We also provide our network-neutral colocation and interconnection services utilizing our own datacenters located within major carrier hotels and other strategic buildings in 37 locations throughout the United States and operate more than 265,000 square feet of billable colocation space.



Title of Each Class of Securities to be Registered	Amount to be registered(1)	Proposed maximum offering price per share	Proposed maximum aggregate offering price(2)	Amount of registration fee(3)
Common stock, par value $0.001 per share	33,235,000	$24.00	$797,640,000.00	$92,685.77



*Cowen and Company*	*Oppenheimer & Co.*	*Raymond James*	*Stephens Inc.*	*Wells Fargo Securities*	*William Blair*


	As of June 30, 2014
	Actual			Pro Forma as Adjusted
	(in thousands, except share and per share data)

Cash and cash equivalents	$	297,423		$	399,348


Long-term debt and capital lease obligations:
Revolving credit facility	$	—		$	—
Term loan facility		1,990,123			1,990,123
Senior secured notes		750,000			750,000
Senior unsecured notes		500,000			500,000
Capital lease obligations		25,271			25,271

Total debt		3,265,394			3,265,394

Stockholders’ Equity:
Common stock, $0.001 par value per share, 1,000 shares authorized, 1,000 shares issued and outstanding, actual; $0.001 par value per share, 850,000,000 shares authorized, 234,100,000 shares issued and outstanding, pro forma as adjusted		—			234
Preferred stock, $0.001 par value per share, no shares authorized, issued or outstanding, actual; $0.001 par value per share, 50,000,000 shares authorized, no shares issued or outstanding, pro forma as adjusted		—			—
Additional paid-in capital		755,634			987,900
Accumulated other comprehensive loss		14,442			14,442
Accumulated deficit		(331,641	)		(331,641	)
Note receivable from CII		(22,050	)		(22,050	)

Total stockholders’ equity		416,385			648,885

Total capitalization	$	3,681,779		$	3,914,279


	Shares Purchased (in thousands)				Total Consideration (in thousands)				Average Price Per Share
	Number		Percent		Amount		Percent		Average Price Per Share

Existing stockholders		223,000		95%	$	733,584		75%	$	3.29
New investors		11,100		5%		249,750		25%		22.50

Total		234,100		100%	$	983,334		100%	$	4.20


*Morgan Stanley*		*Barclays*		*Goldman, Sachs & Co.*


*RBC Capital Markets*		*Citigroup*		*SunTrust Robinson Humphrey*


	Page
PROSPECTUS SUMMARY		1
CORPORATE INFORMATION		8
THE OFFERING		10
RISK FACTORS		16
FORWARD LOOKING STATEMENTS		31
USE OF PROCEEDS		32
DIVIDEND POLICY		33
CAPITALIZATION		34
DILUTION		35
SELECTED HISTORICAL CONSOLIDATED FINANCIAL INFORMATION		37
MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS		40
BUSINESS		73
MANAGEMENT		91
EXECUTIVE COMPENSATION		99
PRINCIPAL AND SELLING STOCKHOLDERS		118
CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS		123
DESCRIPTION OF CERTAIN INDEBTEDNESS		126
DESCRIPTION OF CAPITAL STOCK		127
SHARES ELIGIBLE FOR FUTURE SALE		131
MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES TO NON-U.S. HOLDERS OF OUR COMMON STOCK		133
UNDERWRITING		137
LEGAL MATTERS		143
EXPERTS		143
WHERE YOU CAN FIND MORE INFORMATION		144
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS		F-1
GLOSSARY OF TERMS		G-1


Initial public offering price per share				$	22.50
Pro forma net tangible book deficit per share as of June 30, 2014, before giving effect to this offering	$	(5.16	)
Decrease in pro forma net tangible book deficit per share attributable to new investors in this offering	$	1.24

Pro forma as adjusted net tangible book deficit per share after giving effect to this offering				$	(3.92	)

Dilution per share to new investors purchasing shares in this offering				$	26.42


	Year Ended June 30,
	2010			2011			2012			2013			2014
	(unaudited)
Consolidated Statements of Operations Data (in thousands, except for share data):
Revenue	$	197,889		$	282,143		$	375,526		$	1,004,354		$	1,123,187
Operating costs and expenses		184,766			244,165			305,707			894,781			1,067,161

Operating income		13,123			37,978			69,819			109,573			56,026
Other expenses, net		(23,047	)		(33,540	)		(52,845	)		(279,391	)		(200,375	)

Earnings/(loss) from continuing operations before income taxes		(9,924	)		4,438			16,974			(169,818	)		(144,349	)
Provision/(benefit) for income taxes		4,549			11,329			26,871			(24,205	)		37,295

Loss from continuing operations		(14,473	)		(6,891	)		(9,897	)		(145,613	)		(181,644	)
Earnings from discontinued operations, net of income taxes		6,761			5,331			8,673			8,396			2,350

Net loss	$	(7,712	)	$	(1,560	)	$	(1,224	)	$	(137,217	)	$	(179,294	)

Weighted-average shares used to compute net loss per share:
Basic and diluted		1,000			1,000			1,000			1,000			1,000
Loss from continuing operations per share:
Basic and diluted	$	(14,473	)	$	(6,891	)	$	(9,897	)	$	(145,613	)	$	(181,644	)
Income from discontinued operations per share:
Basic and diluted		6,761			5,331			8,673			8,396			2,350
Pro forma net loss per share (unaudited)(1):
Basic and diluted
Consolidated Balance Sheet Data (at period end) (in thousands):
Cash and cash equivalents	$	87,864		$	25,394		$	150,693		$	91,313		$	297,423
Property and equipment, net		297,889			518,513			754,738			2,437,707			2,808,314
Total assets		605,474			849,396			1,442,055			4,251,240			5,049,066
Long-term debt and capital lease obligations, including current portion		259,786			365,588			701,339			2,843,872			3,265,394
Total stockholder’s equity		243,323			258,083			410,314			606,253			416,385


Acquisition	Date		Acquisition Cost
			(In thousands)
Memphis Networx		July 31, 2007	$	9,173
PPL Telecom		August 24, 2007		46,301
Indiana Fiber Works		September 28, 2007		22,601
Onvoy		November 7, 2007		69,962
Voicepipe		November 7, 2007		2,800
Citynet Fiber Networks		February 15, 2008		99,238
Northwest Telephone		May 30, 2008		5,181
CenturyTel Tri-State Markets		July 22, 2008		2,700
Columbia Fiber Solutions		September 30, 2008		12,091
CityNet Holdings Assets		September 30, 2008		3,350
Adesta Assets		September 30, 2008		6,430
Northwest Telephone California		May 26, 2009		15
FiberNet		September 9, 2009		96,571
AGL Networks		July 1, 2010		73,666
Dolphini Assets		September 20, 2010		235
American Fiber Systems		October 1, 2010		114,141
360networks		December 1, 2011		317,891
MarquisNet		December 31, 2011		13,581
Arialink		May 1, 2012		17,129
AboveNet		July 2, 2012		2,210,043
FiberGate		August 31, 2012		118,335
USCarrier		October 1, 2012		16,092
FTS		December 14, 2012		109,700
Litecast		December 31, 2012		22,160
Core NAP		May 31, 2013		7,080
Corelink		August 1, 2013		16,128
Access		October 1, 2013		40,068
FiberLink		October 2, 2013		43,137
CoreXchange		March 4, 2014		17,503
Geo		May 16, 2014		292,332
Less portion of acquisition costs allocated to the discontinued operations of Onvoy				(62,823	)

Total			$	3,742,811


	June 30, 2014		June 30, 2013
Physical Infrastructure		861		584
Lit Services		623		546
Other		29		30

Total		1,513		1,160


	Estimated fair value as of June 30,
Common Units of CII	2014		2013		2012
Class A	$	2.47	$	1.50	$	0.92
Class B		2.22		1.34		0.81
Class C		1.92		1.14		0.68
Class D		1.86		1.10		0.65
Class E		1.62		0.95		0.55
Class F		1.44		0.75		0.49
Class G		0.82		0.46		n/a
Class H		0.70		0.38		n/a
Class I		0.45		n/a		n/a
Class J		0.33		n/a		n/a
Class K		0.29		n/a		n/a
ZPS Class A		0.09		0.20		n/a


	June 30, 2013		June 30, 2012
Physical Infrastructure		584		225
Lit Services		546		275
Other		30		—

Total		1,160		500


	Estimated fair value as of June 30,
Common Units	2013		2012		2011
Class A	$	1.50	$	0.92	$	0.81
Class B		1.34		0.81		0.58
Class C		1.14		0.68		0.33
Class D		1.10		0.65		0.31
Class E		0.95		0.55		0.23
Class F		0.75		0.49		n/a
Class G		0.46		n/a		n/a
Class H		0.38		n/a		n/a
ZPS Class A		0.20		n/a		n/a


	For the year ended June 30, 2014
	Physical Infrastructure			Lit Services			Other			Corp/ eliminations			Total
	(in millions)
Segment and consolidated Adjusted EBITDA	$	324.9		$	325.9		$	8.0		$	(5.2	)	$	653.6
Interest expense		(121.8	)		(81.2	)		—			(0.5	)		(203.5	)
Depreciation and amortization expense		(205.1	)		(131.4	)		(1.8	)		—			(338.3	)
Transaction costs		(2.8	)		(1.0	)		—			(1.5	)		(5.3	)
Stock-based compensation		(163.4	)		(90.0	)		(0.3	)		—			(253.7	)
Loss on extinguishment of debt		(1.1	)		(0.8	)		—			—			(1.9	)
Unrealized foreign currency gains		—			—			—			4.7			4.7

(Loss)/earnings from continuing operations before provision for income taxes		(169.3	)		21.5			5.9			(2.5	)		(144.4	)
Provision for income taxes		—			—			—			(37.3	)		(37.3	)
Earnings from discontinued operations, net of income taxes		—			—			—			2.4			2.4

Net (loss)/earnings	$	(169.3	)	$	21.5		$	5.9		$	(37.4	)	$	(179.3	)


	For the year ended June 30, 2013
	Physical Infrastructure			Lit Services			Other			Corp/ eliminations			Total
	(in millions)
Segment and consolidated Adjusted EBITDA	$	275.7		$	277.9		$	6.1		$	(5.3	)	$	554.4
Interest expense		(119.0	)		(83.5	)		—			—			(202.5	)
Depreciation and amortization expense		(183.5	)		(139.1	)		(1.9	)		—			(324.5	)
Transaction costs		(7.2	)		(7.0	)		—			—			(14.2	)
Stock-based compensation		(46.4	)		(58.7	)		(0.7	)		—			(105.8	)
Loss on extinguishment of debt		(45.1	)		(32.2	)		—			—			(77.3	)
Unrealized foreign currency gains		—			—			—			0.1			0.1

Earnings/(loss) from continuing operations before benefit for income taxes		(125.5	)		(42.6	)		3.5			(5.2	)		(169.8	)
Benefit for income taxes		—			—			—			24.2			24.2
Earnings from discontinued operations, net of income taxes		—			—			—			8.4			8.4

Net (loss)/earnings	$	(125.5	)	$	(42.6	)	$	3.5		$	27.4		$	(137.2	)


	For the year ended June 30, 2012
	Physical Infrastructure			Lit Services			Other		Corp/ eliminations			Total
	(in millions)
Segment and consolidated Adjusted EBITDA	$	101.1		$	92.1		$	—	$	(5.4	)	$	187.8
Interest expense		(23.2	)		(27.5	)		—		—			(50.7	)
Depreciation and amortization expense		(38.6	)		(46.4	)		—		—			(85.0	)
Transaction costs		(2.2	)		(4.4	)		—		—			(6.6	)
Impairment of cost method investment		—			(2.2	)		—		—			(2.2	)
Stock-based compensation		(13.6	)		(12.7	)		—		—			(26.3	)

Earnings/(loss) from continuing operations before provision for income taxes		23.5			(1.1	)		—		(5.4	)		17.0
Provision for income taxes		—			—			—		(26.9	)		(26.9	)
Earnings from discontinued operations, net of income taxes		—			—			—		8.7			8.7

Net earnings/(loss)	$	23.5		$	(1.1	)	$	—	$	(23.6	)	$	(1.2	)


	Total		Less Than 1 Year		1-3 Years		3-5 Years		More Than 5 Years
	(in thousands)
Long-term debt (principal and interest)	$	4,368,768	$	217,956	$	433,656	$	420,836	$	3,296,320
Operating leases		858,414		98,665		150,535		111,332		497,882
Purchase commitments		157,105		157,105		—		—		—
Capital leases (principal and interest)		31,948		4,012		7,982		6,778		13,176

Total	$	5,416,235	$	477,738	$	592,173	$	538,946	$	3,807,378


	Estimated fair value per unit as of
Common Units	June 30, 2014		June 30, 2013		June, 30 2012
Class A	$	2.47	$	1.50	$	0.92
Class B		2.22		1.34		0.81
Class C		1.92		1.14		0.68
Class D		1.86		1.10		0.65
Class E		1.62		0.95		0.55
Class F		1.44		0.75		0.49
Class G		0.82		0.46		n/a
Class H		0.70		0.38		n/a
Class I		0.45		n/a		n/a
Class J		0.33		n/a		n/a
Class K		0.29		n/a		n/a
ZPS Class A		0.09		0.20		n/a


Land			N/A
Buildings improvements and site improvements			15 to 20
Furniture, fixtures and office equipment			3 to 7
Computer hardware			3 to 5
Software			3
Machinery and equipment			5 to 7
Fiber optic equipment			8
Circuit switch equipment			10
Packet switch equipment			5
Fiber optic network			15 to 20
Construction in progress			N/A