Repligen to Acquire Metenova AB

Safe Harbor / Non-GAAP Financial Measures This press release contains forward-looking statements within the meaning of the federal securities laws. Investors are cautioned that statements in this press release which are not strictly historical statements, including, without limitation, express or implied statements or guidance regarding the expected results of the proposed acquisition of Metenova AB (Metenova) on Repligen's future financial performance, including the accretive nature and the timing of the accretive nature of the acquisition, expected synergies and revenue contribution following the closing of the Metenova acquisition, customer adoption of Metenova products and beliefs about the single-use market, the expected expansion of Repligen's product lines, and other statements identified by words like "believe," "expect," "anticipate," "may," "will," "should," "targeted," "seek," or "could" and similar expressions, constitute forward-looking statements. Such forward-looking statements are subject to a number of risks and uncertainties that could cause actual results to differ materially from those anticipated, including, without limitation, risks associated with: the risk that the proposed acquisition may not be completed in a timely manner, or at all; the occurrence of any event, change or other circumstance that could give rise to the termination of the acquisition; Repligen's ability to integrate Metenova's business and personnel and to achieve expected synergies and accretion; Repligen's ability to maintain or expand Metenova's historical sales; Repligen's ability to accurately forecast the acquisition, related restructuring costs and allocation of the purchase price, goodwill and other intangibles acquisition related and other asset adjustments; and other risks detailed in Repligen's most recent Annual Report on Form 10-K subsequently filed Quarterly Reports on Form-10-Q and Current Reports on Form 8-K on file with the Securities and Exchange Commission, and the other reports that Repligen periodically files with the Securities and Exchange Commission. Actual results may differ materially from those Repligen contemplated by these forward-looking statements. Therefore, you should not rely on any of these forward-looking statements. These forward-looking statements reflect management's current views and are based only on information currently available to us. Repligen does not undertake to update, whether written or oral, any of these forward-looking statements to reflect a change in its views or events or circumstances, whether as a result of new information or otherwise, that occur after the date hereof except as required by law. The industry and market data contained in this presentation are based on management's own estimates, independent publications, government publications, reports by market research firms or other published independent sources, and, in each case, are believed by management to be reasonable estimates. Although we believe these sources are reliable, we have not independently verified the information. R REPLIGEN metem nova 2

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