Charles River Laboratories Announces Closing of Senior Notes Offering

Charles River Laboratories International, Inc. (NYSE: CRL) announced today that it has closed its previously announced offering of $500 million in aggregate principal amount of its 5.5% senior notes due 2026 (the “notes”) in an unregistered offering. Charles River is issuing the notes as a strategic complement to its long-term capital structure.

The notes have not been, and will not be, registered under the Securities Act of 1933, as amended (the “Securities Act”), or under the securities laws of any other jurisdiction. Unless they are registered, the notes may be offered only in transactions that are exempt from registration under the Securities Act and applicable state securities laws. The notes were offered only to persons reasonably believed to be qualified institutional buyers under Rule 144A under the Securities Act and to non-U.S. persons outside the United States under Regulation S of the Securities Act.

This press release does not constitute an offer to sell or a solicitation of an offer to buy the notes, nor shall there be any sale of the notes in any state or jurisdiction in which such an offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

Caution Concerning Forward-Looking Statements

This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by the use of words such as “anticipate,” “believe,” “expect,” “intend,” “will,” “may,” “estimate,” “plan,” “outlook,” and “project” and other similar expressions that predict or indicate future events or trends or that are not statements of historical matters. Forward-looking statements are based on Charles River’s current expectations and beliefs, and involve a number of risks and uncertainties that are difficult to predict and that could cause actual results to differ materially from those stated or implied by the forward-looking statements. A further description of these risks, uncertainties, and other matters can be found in the Risk Factors detailed in Charles River's Annual Report on Form 10-K as filed on February 13, 2018, as well as other filings we make with the Securities and Exchange Commission. Because forward-looking statements involve risks and uncertainties, actual results and events may differ materially from results and events currently expected by Charles River, and Charles River assumes no obligation and expressly disclaims any duty to update information contained in this news release except as required by law.

About Charles River

Charles River provides essential products and services to help pharmaceutical and biotechnology companies, government agencies and leading academic institutions around the globe accelerate their research and drug development efforts. Our dedicated employees are focused on providing clients with exactly what they need to improve and expedite the discovery, early-stage development and safe manufacture of new therapies for the patients who need them.

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Charles River Laboratories International, Inc.Investor Contact:Susan E. Hardy, 781-222-6190Corporate Vice President, Investor [e-mail] Contact:Amy Cianciaruso, 781-222-6168Corporate Vice President, Public [e-mail]