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Zayo Expands and Upgrades Long Haul Fiber in the UK

Unique Northern England and UK network provides access to latest subsea cables

BOULDER, Colo. –
Zayo Group Holdings, Inc. (NYSE: ZAYO) announced today that it is extending and
upgrading a new long-haul fiber ring and networks 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 a 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 fiber 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 fiber 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 fiber internet routes in the UK. 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 fiber 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 fiber network,
data center 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 fiber 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 centers. In
addition to high-capacity dark fiber, wavelength, Ethernet and other
connectivity solutions, Zayo offers colocation and cloud infrastructure
in its carrier-neutral data centers. 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.

Media:
Shannon Paulk, Corporate Communications
303-577-5897
press@zayo.com

Investors:
Brad Korch, Investor Relations
720-306-7556
IR@zayo.com