Investor Presentaiton

Safe Harbor Statement Dexcom This presentation contains "forward" looking statements that are based on our management's beliefs and assumptions and on information currently available to management. We intend for such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements include information concerning our possible or assumed strategy, future operations, financing plans, operating model, financial position, future revenues, gross margin, operating margin, projected costs, competitive position, industry environment, potential growth opportunities, potential market opportunities, plans and objectives of management and the effects of competition on our business. This presentation also contains estimates and other statistical data made by independent parties relating to market size and growth and other data about our industry. This data involves a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. Forward-looking statements include all statements that are not historical facts and can be identified by terms such as "anticipates," "believes," "could," "seeks," "estimates," "targets," "guidance," "expects," "intends," "may," "plans," "potential," "predicts," "prospects," "projects," "should," "will," "would" or similar expressions and the negatives of those terms, although not all forward-looking statements contain these identifying words. Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. We cannot guarantee that we will achieve the plans, intentions, or expectations disclosed in our forward-looking statements, and you should not place undue reliance on our forward-looking statements. The risks and uncertainties that may cause actual results to differ materially from our current expectations are more fully described in our annual report on Form 10- K for the period ended December 31, 2022, as filed with the Securities and Exchange Commission on February 9, 2023, our most recent quarterly report on Form 10-Q for the period ended June 30, 2023, as filed with the Securities and Exchange Commission on July 27, 2023, and our other reports, each as filed with the Securities and Exchange Commission. We assume no obligation to update any such forward-looking statement after the date of this presentation or to conform these forward-looking statements to actual results. We report non-GAAP financial measures in addition to, and not as a substitute for, or superior to, measures of financial performance prepared in accordance with GAAP. These non-GAAP financial measures are not based on any comprehensive set of accounting rules or principles, differ from GAAP measures with the same names, and may differ from non-GAAP financial measures with the same or similar names that are used by other companies. We believe that non-GAAP financial measures should only be used to evaluate our results of operations in conjunction with the corresponding GAAP financial measures. We encourage investors to carefully consider our results under GAAP, as well as our supplemental non-GAAP information and the reconciliations between these presentations, to more fully understand our business. 2

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