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Highly Purified Peptide/Protein Biosimilar Interchangeable Proprietary Injectables Inhalation Intranasal New Molecular Peptides Oncology Ophthalmology RheumatologyWells Fargo 21st Annual Healthcare Conference September 8th, 2026
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2 Forward Looking Statements This presentation and the accompanying oral presentation contain forward-looking statements, of Amphastar Pharmaceuticals, Inc. (“Amphastar”, “we”. “our” and that are based on our management’s current expectations and assumptions and on information currently available to management. Forward-looking statements include all statements other than statements of historical fact contained in this presentation, including, but not limited to, information concerning our business plans and objectives, potential growth opportunities, product development, regulatory approvals, market potential, efficiencies, competitive position, and industry environment, among other statements. All statements in this presentation referenced above that are not historical are forward-looking statements, including, among other things, statements relating to our expectations regarding future financial performance and business trends, our future growth, and our ability to continue to scale, sales and marketing of our products, market size and expansion, product portfolio, product development, the timing of FDA filings or approvals, the timing of product launches, acquisitions and other matters related to our pipeline of product candidates, the timing and results of clinical trials, the impact of our products, including their potential for continued revenue growth, the strategic trajectory of and market for our product pipeline, our long-term strategic vision, our ability to leverage our existing expertise and technology, the impacts of any licensing agreements and ability to commercialize additional therapies, our in-house manufacturing expertise, our ability to deliver high-quality, affordable therapies to patients, our commercial momentum and position in the market. These statements are not facts but rather are based on Amphastar’s historical performance and our current expectations, estimates, and projections regarding our business, operations, and other similar or related factors. Words such as “may,” “might,” “will,” “could,” “would,” “should,” “anticipate,” “predict,” “potential,” “continue,” “expect,” “intend,” “plan,” “project,” “believe,” “estimate,” and other similar or related expressions are used to identify these forward-looking statements, although not all forward-looking statements contain these words. You should not place undue reliance on forward-looking statements because they involve known and unknown risks, uncertainties, and assumptions that are difficult or impossible to predict and, in some cases, beyond Amphastar’s control. Actual results may differ materially from those in the forward-looking statements as a result of a number of factors, including those described in Amphastar’s filings with the Securities and Exchange Commission (“SEC”), including in our Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on February 26, 2026, in our Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, filed with the SEC on May 7, 2026, in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2026, filed with the SEC on August 6, 2026, and our other filings or reports that we may file with the SEC. You can locate these reports through our website at http://ir.amphastar.com and on the SEC’s website at www.sec.gov. The forward-looking statements in this release speak only as of the date of the release. Amphastar undertakes no obligation to revise or update information or any forward-looking statements in this presentation referenced above to reflect events or circumstances in the future, even if new information becomes available or if subsequent events cause our expectations to change. The forward-looking statements in this presentation speak only as of the date of the release. Amphastar undertakes no obligation to revise or update information or any forward looking statements in this press release or the conference call referenced above to reflect events or circumstances in the future, even if new information becomes available or if subsequent events cause our expectations to change. You should not rely upon forward-looking statements as predictions of future events. Although our management believes that the expectations reflected in our forward-looking statements are reasonable, we cannot guarantee that the future results, levels of activity, performance or events and circumstances described in the forward-looking statements will be achieved or occur as forward-looking statements are inherently susceptible to uncertainty and changes in circumstances as with any projections or forecasts. Moreover, neither we, nor any other person, assume responsibility for the accuracy and completeness of the forward-looking statements. Any forward-looking statements made by us in this presentation speak only as of the date of this presentation, and we undertake no obligation to update any forward looking statements for any reason after the date of this presentation, except as required by law. All third-party brand names and logos appearing in this presentation are trademarks or registered trademarks of their respective holders. Any such appearance does not necessarily imply any endorsement of the company.