Exhibit 99.1


Charles River Laboratories Announces First-Quarter 2021 Results

– First-Quarter Revenue of $824.6 Million –

– First-Quarter GAAP Earnings per Share of $1.20 and Non-GAAP Earnings per Share of $2.53 –

– Updates 2021 Guidance –

WILMINGTON, Mass.--(BUSINESS WIRE)--May 4, 2021--Charles River Laboratories International, Inc. (NYSE: CRL) today reported its results for the first quarter of 2021. For the quarter, revenue was $824.6 million, an increase of 16.6% from $707.1 million in the first quarter of 2020.

Acquisitions contributed 0.7% to consolidated first-quarter revenue growth. The impact of foreign currency translation benefited reported revenue growth by 2.9%. Excluding the effect of these items, organic revenue growth of 13.0% was driven by contributions from all three business segments. The year-over-year comparison to last year’s COVID-19-related revenue impact contributed approximately 140 basis points to the reported and organic revenue growth rates in the first quarter, principally in the Research Models and Services segment.

On a GAAP basis, first-quarter net income attributable to common shareholders was $61.5 million, an increase of 21.2% from net income of $50.8 million for the same period in 2020. First-quarter diluted earnings per share on a GAAP basis were $1.20, an increase of 17.6% from $1.02 for the first quarter of 2020. The increases in the GAAP net income and earnings per share were driven primarily by higher revenue and operating margin improvement, partially offset by debt extinguishment costs and the write-off of deferred financing costs related to debt refinancing activities in the first quarter of 2021.

On a non-GAAP basis, net income from continuing operations was $129.2 million for the first quarter of 2021, an increase of 40.7% from $91.8 million for the same period in 2020. First‑quarter diluted earnings per share on a non-GAAP basis were $2.53, an increase of 37.5% from $1.84 per share for the first quarter of 2020. The non-GAAP net income and earnings per share increases were driven primarily by higher revenue and operating margin improvement.

James C. Foster, Chairman, President and Chief Executive Officer, said, “Our first-quarter performance demonstrates the power of our unique, non-clinical portfolio and the strength of the biopharmaceutical market environment. A global focus on scientific innovation is driving record levels of investment in the biopharmaceutical industry, which is generating biomedical breakthroughs across multiple therapeutic areas at a rapid pace. We believe these factors are resulting in unprecedented client demand across most of our businesses.”


The following information was filed by Charles River Laboratories International Inc (CRL) on Tuesday, May 4, 2021 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-Q Quarterly Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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