December 19, 2018

Arch Insurance Announces Closing of Acquisition of McNeil & Co.

PEMBROKE, Bermuda–()–Arch Capital Group Ltd. [NASDAQ: ACGL] today announced the completion of
its previously disclosed acquisition of McNeil & Co. (“McNeil”), a
nationwide leader in specialized risk management and insurance programs.

“We know that McNeil’s reputation and
talented workforce will be a real asset to our operations and will
enable us to continue to expand what is possible for our clients in the
United States.”

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McNeil & Co., headquartered in Cortland, New York, will operate as an
independent, wholly owned subsidiary of Arch Insurance.

“We are excited to complete this transaction, which will allow us to
deploy Arch’s substantial resources to help McNeil expand their presence
in the program space,” said Nicolas Papadopoulo, Chairman and CEO of
Arch Worldwide Insurance Group. “We know that McNeil’s reputation and
talented workforce will be a real asset to our operations and will
enable us to continue to expand what is possible for our clients in the
United States.”

About Arch Capital Group Ltd.

Arch Capital Group Ltd., a Bermuda-based company with approximately
$11.21 billion in capital at September 30, 2018, provides insurance,
reinsurance and mortgage insurance on a worldwide basis through its
wholly owned subsidiaries.

Cautionary Note Regarding Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 provides a “safe
harbor” for forward−looking statements. This release or any other
written or oral statements made by or on behalf of Arch Capital Group
Ltd. and its subsidiaries may include forward−looking statements, which
reflect our current views with respect to future events and financial
performance. All statements other than statements of historical fact
included in or incorporated by reference in this release are
forward−looking statements.

Forward−looking statements can generally be identified by the use of
forward−looking terminology such as “may,” “will,” “expect,” “intend,”
“estimate,” “anticipate,” “believe” or “continue” or their negative or
variations or similar terminology. Forward−looking statements involve
our current assessment of risks and uncertainties. Actual events and
results may differ materially from those expressed or implied in these
statements. A non-exclusive list of the important factors that could
cause actual results to differ materially from those in such
forward-looking statements includes the following: adverse general
economic and market conditions; increased competition; pricing
and policy term trends; fluctuations in the actions of
rating agencies and our ability to maintain and improve our
ratings; investment performance; the loss of key personnel; the
adequacy of our loss reserves, severity and/or frequency of
losses, greater than expected loss ratios and adverse development on
claim and/or claim expense liabilities; greater frequency or
severity of unpredictable natural and man-made catastrophic events; the
impact of acts of terrorism and acts of war; changes in regulations
and/or tax laws in the United States or elsewhere; our
ability to successfully integrate, establish and maintain operating
procedures as well as integrate the businesses we have acquired or may
acquire into the existing operations; changes in accounting
principles or policies; material differences between actual
and expected assessments for guaranty funds and mandatory pooling
arrangements; availability and cost to us of reinsurance to
manage our gross and net exposures; the failure of others to
meet their obligations to us; and other factors identified
in our filings with the U.S. Securities and Exchange Commission.

The foregoing review of important factors should not be construed as
exhaustive and should be read in conjunction with other cautionary
statements that are included herein or elsewhere. All subsequent written
and oral forward−looking statements attributable to us or persons acting
on our behalf are expressly qualified in their entirety by these
cautionary statements. We undertake no obligation to publicly update or
revise any forward−looking statement, whether as a result of new
information, future events or otherwise.

Contacts

Arch Capital Group Ltd.
François Morin
441-278-9250
or
Arch
Insurance Group

Mark Lange
860-713-2026