Zayo Expands and Upgrades Long Haul Fibre in the UK

Unique Northern England network provides access to latest subsea cables

BOULDER, Colo. – November 30, 2018 – Zayo Group Holdings, Inc. (NYSE: ZAYO) announced today that it is extending and upgrading a new long haul fibre ring in the UK to enable its multinational customers to traverse the country via the most direct, low-latency paths. The 500-kilometer ring, which includes new build, will also provide access to the UK’s latest subsea cable crossings in both the Irish and North Seas.

As part of the project, Zayo will increase the overall fibre count on its existing UK network, and add two new unique routes, spanning from coast-to-coast, in order to complete the ring. The project, expected to be completed in less than 12 months, incorporates advanced, high-count, ultra-low loss fibre types, built over the shortest physical paths, providing Zayo customers with maximum scalability and throughput.

Based on demand from multiple tenants, Zayo expects a strong return on capital on these unique fibre routes. The routes will also be available for wavelengths.

The project, the largest build Zayo has undertaken in Europe to date, is another example of the momentum of Zayo’s European business. Zayo’s network extends across eight European countries and major cities and includes more than one million fibre kilometers. Zayo recently announced additional success-based metro expansions in London, Paris, Dublin and Amsterdam.

“Our continued expansion underscores our commitment to Europe and provides opportunity for customers who can benefit from our fibre network, data centre footprint and extensive connectivity across our global network,” said Annette Murphy, Managing Director of Zayo Europe.

For more information about Zayo, please visit zayo.com.

About Zayo Group

Zayo Group Holdings, Inc. (NYSE: ZAYO) provides communications infrastructure solutions, including fibre and bandwidth connectivity, colocation and cloud infrastructure to the world’s leading businesses. Customers include wireless and wireline carriers, media and content companies and finance, healthcare and other large enterprises. Zayo’s 130,000-mile network in North America and Europe includes extensive metro connectivity to thousands of buildings and data centres. In addition to high-capacity dark fibre, wavelength, Ethernet and other connectivity solutions, Zayo offers colocation and cloud infrastructure in its carrier-neutral data centres. Zayo provides users with flexible, customized solutions and self-service through Tranzact, an innovative online platform for managing and purchasing bandwidth. For more information, visit zayo.com.

Forward Looking Statements

This press release contains a number of forward-looking statements. Words, and variations of words such as “believe,” “expect,” “plan,” “continue,” “will,” “should,” and similar expressions are intended to identify our forward-looking statements. 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. These forward-looking statements involve risks and uncertainties, many of which are beyond our control. For additional information on these and other factors that could affect our forward-looking statements, see our risk factors, as they may be amended from time to time, set forth in our filings with the SEC, including our 10-K dated August 24, 2018. We disclaim and do not undertake any obligation to update or revise any forward-looking statement in this press release, except as required by applicable law or regulation.