James River Group Holdings, Ltd. to be Added to Russell 2000(R), Russell 3000(R) and Russell Microcap(R) Indexes

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CaribPR Wire, HAMILTON, Bermuda, March 25, 2015 — James River Group Holdings, Ltd. (Nasdaq:JRVR) announced that effective as of the close of the market on Monday, March 31, 2015, the Company will be added to the Russell 2000(R) index, the Russell 3000(R) index and the Russell Microcap(R) index, as part of the quarterly Initial Public Offering (IPO) update to the Russell indexes.

Over the past 30 years, Russell Indexes have provided tools to help investors build, track and manage investment portfolios.

The Russell 3000 Index measures the performance of the largest 3,000 U.S. companies representing approximately 98% of the investable U.S. equity market. The Russell 3000 Index is constructed to provide a comprehensive, unbiased and stable barometer of the broad market and is completely reconstituted annually to ensure new and growing equities are reflected. The Russell 2000 Index measures the performance of the small-cap segment of the U.S. equity universe. The Russell 2000 Index is a subset of the Russell 3000(R) Index representing approximately 10% of the total market capitalization of that index. The Russell 2000 is constructed to provide a comprehensive and unbiased small-cap barometer and is completely reconstituted annually to ensure larger stocks do not distort the performance and characteristics of the true small-cap opportunity set.

The Russell

Microcap(R) Index measures the performance of the microcap segment of the U.S. equity market. Microcap stocks make up less than 3% of the U.S. equity market (by market cap) and consist of the smallest 1,000 securities in the small-cap Russell 2000(R) Index, plus the next 1,000 smallest eligible securities by market cap.

Additional information about the Russell Investments indexes can be found at http://www.russell.com/indexes/americas/default.page

About James River Group Holdings, Ltd.

James River Group Holdings, Ltd. is a Bermuda-based insurance holding company which owns and operates a group of specialty insurance and reinsurance companies founded by members of our management team. The company operates in three specialty property-casualty insurance and reinsurance segments: Excess and Surplus Lines, Specialty Admitted Insurance and Casualty Reinsurance. The company tends to focus on accounts associated with small or medium-sized businesses in each of its segments. Each of the Company’s regulated insurance subsidiaries are rated “A-” (Excellent) with a “positive outlook” by A.M. Best Company.

Visit James River Group Holdings, Ltd. on the web at www.jrgh.net

CONTACT: Robert Myron

President and Chief Operating Officer

1-441-278-4583

[email protected]

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