Financial Guidance and Company Overview

Forward-Looking Statements This presentation contains "forward-looking statements". All statements, other than statements of historical fact, included herein, including without limitation those regarding our future product development and regulatory events and goals, product collaborations, our business intentions and financial estimates and anticipated results, are, or may be deemed to be, forward-looking statements. Words such as "expect," "anticipate,” “intend,” “plan,” “believe,” “seek," "estimate," "think," "may," "could," "will," "would," "should," "continue," "potential," "likely," "opportunity," "project" and similar expressions or variations of such words are intended to identify forward-looking statements, but are not the exclusive means of identifying forward-looking statements in this presentation. Although Halozyme's and Antares' management each believes that the expectations reflected in such forward-looking statements are reasonable, investors are cautioned that forward-looking information and statements are subject to various risks and uncertainties, many of which are difficult to predict and generally beyond the control of Halozyme and Antares, that could cause actual results and developments to differ materially from those expressed in, or implied or projected by, the forward-looking information and statements. These risks and uncertainties include among other things, risks related to Halozyme's and Antares' ability to complete the proposed acquisition on the proposed terms or on the proposed timeline, including the receipt of required regulatory approvals, the possibility that competing offers will be made, other risks associated with executing proposed acquisition, such as the risk that the businesses will not be integrated successfully, that such integration may be more difficult, time-consuming or costly than expected or that the expected benefits of the proposed acquisition will not be realized, risks related to future opportunities and plans for the combined company, including uncertainty of the expected financial performance and results of the combined company following completion of the proposed acquisition, disruption from the proposed acquisition making it more difficult to conduct business as usual or to maintain relationships with customers, employees, manufacturers or suppliers, and the possibility that, if the combined company does not achieve the perceived benefits of the proposed acquisition as rapidly or to the extent anticipated by financial analysts or investors, the market price of Halozyme's shares could decline, as well as other risks related Halozyme's and Antares' respective businesses, including the ability to grow sales and revenues from existing products and to develop, commercialize or market new products, competition, including potential generic competition, the uncertainties inherent in research and development, including future clinical data and analysis, regulatory obligations and oversight by regulatory authorities, such as the U.S. Food and Drug Administration, including decisions of such authorities regarding whether and when to approve any drug, device or biological application that may be filed for any product candidates as well as decisions regarding labelling and other matters that could affect the availability or commercial potential of any product candidates, the absence of a guarantee that any product candidates, if approved, will be commercially successful, Halozyme's ability to execute its share repurchase program according to plan, Halozyme's ability to benefit from external growth opportunities, to complete related transactions and/or obtain regulatory clearances, risks associated with Halozyme's and Antares' intellectual property and any related pending or future litigation and the ultimate outcome of such litigation, trends in exchange rates and prevailing interest rates, volatile economic and market conditions, cost containment initiatives and subsequent changes thereto, and the impact that COVID-19 will have on Halozyme and on Antares and their respective customers, suppliers, vendors, and other business partners, and the financial condition of any one of them, as well as on Halozyme's and Antares' employees and on the global economy as a whole. Any material effect of COVID-19 on any of the foregoing could also adversely impact Halozyme and Antares. This situation is changing rapidly and additional impacts may arise of which Halozyme and Antares are not currently aware and may exacerbate other previously identified risks. While the list of factors presented here is representative, no list should be considered a statement of all potential risks, uncertainties or assumptions that could have a material adverse effect on Halozyme's consolidated financial condition or results of operations. The foregoing factors should be read in conjunction with the risks and cautionary statements discussed or identified in the public filings with the U.S. Securities and Exchange Commission (the "SEC") made by Halozyme, including those listed under "Risk Factors" and "Cautionary Statement Regarding Forward-Looking Statements" in Halozyme's annual report on Form 10-K for the year ended December 31, 2021 and Antares' annual report on Form 10-K for the year ended December 31, 2021. The forward-looking statements speak only as of the date hereof and, other than as required by applicable law, Halozyme and Antares do not undertake any obligation to update or revise any forward-looking information or statements. Investors are urged not to place undue reliance on these forward-looking statements, which speak only as of the date of this presentation. Note: This presentation contains product names, trademarks and registered trademarks are property of their respective owners Halozyme

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