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Colocation Provider Selects Zayo for Major Network Upgrade

Zayo to provide 100G wavelength connectivity

BOULDER, Colo. –
Zayo Group Holdings, Inc. (NYSE: ZAYO) has been selected by a leading
colocation provider for a wavelengths network to connect its facilities
in the U.S. Zayo will provide a high-performance 100G wavelength
solution connecting its data centers that will serve as the company’s
backbone. The solution leverages Zayo’s existing fiber network,
including recently acquired network from Electric Lightwave.

Resilient, secure, high-speed connectivity is a critical requirement for
optimal data center performance. Increasingly, data center providers are
investing to upgrade their interconnect solutions, as the risk of poor
performance or downtime can be damaging and costly.

“Zayo’s expansive long haul wavelength network will enable this customer
to significantly upgrade its network to accommodate current workloads,
new traffic and future growth,” said Jack Waters, CTO and president of
Network Solutions at Zayo. “Our dense fiber assets and ability to meet
strict diversity requirements for every route were the key
differentiators.”

The solution, which includes more than 20 diverse routes, will also
enable the customer to consolidate infrastructure providers, eliminating
complexity and significantly improving efficiency.

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

About Zayo Group

Zayo Group Holdings, Inc. (NYSE: ZAYO) provides communications
infrastructure services, 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
126,000-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 clients with
flexible, customized solutions and self-service through Tranzact, an
innovative online platform for managing and purchasing bandwidth and
services. 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 25, 2016. 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.

Zayo Group Holdings, Inc.
Media:
Shannon Paulk,
Corporate Communications
303-577-5897
press@zayo.com
or
Investors:
Brad
Korch
, Investor Relations
720-306-7556
IR@zayo.com