MaxCyte Investor Presentation Deck

Disclaimer M MaxCyte The content of this document (the "Presentation") has not been approved by an authorized person within the meaning of the Financial Services and Markets Act 2000 ("FSMA"), as amended. Reliance on this document for the purpose of engaging in any investment activity may expose an individual or organization to a significant risk of losing all of their investment. If you are in any doubt about the investment to which this Presentation relates, you should consult a person authorized by the Financial Conduct Authority who specializes in advising on securities of the kind described in this Presentation or your stockbroker, bank manager, solicitor, accountant or other financial adviser. This Presentation has been issued by MaxCyte Inc (the "Company") and does not constitute or form of, not be construed as an offer or invitation to sell or issue or any solicitation of, any offer to purchase or subscribe for any securities in the Company in any jurisdiction. Neither the Presentation, nor any part of it nor anything contained or referred to in it, nor the fact of its distribution, should form the basis of or be relied on in any connection with or act as an inducement in relation to a decision to purchase or subscribe for or enter into any contract or make any other commitment whatsoever in relation to any such securities. This Presentation does not constitute a recommendation regarding the securities of the Company. This presentation is only addressed to and directed at (i) persons who are outside the United Kingdom, (ii) persons who have professional experience in matters relating to investments falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, as amended (the "Order"), (iii) persons who are high net worth entities falling within Article 49(2)(a) to (d) of the Order, and/or (iv) any other persons to whom this presentation may otherwise lawfully be communicated without contravention of section 21 of the Financial Services and Markets Act 2000 or to whom it may otherwise lawfully be distributed (all such persons together being referred to as "relevant persons"). This presentation may not be acted on or relied on by persons who are not relevant persons. Any investment or investment activity to which this presentation relates is available only to relevant persons. Certain statements in this Presentation are, or may be deemed to be, forward looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1955, including but not limited to statements regarding our expected potential future revenue. The words "may," "might," "will," "could," "would," "should," "expect," "plan," "anticipate," "intend," "believe," "expect," "estimate," "seek," "predict," "future," "project," "potential," "continue," "target" and similar words or expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Any forward-looking statements in this presentation are based on management's current expectations and beliefs and are subject to a number of risks, uncertainties and important factors that may cause actual events or results to differ materially from those expressed or implied by any forward-looking statements contained in this press release, including, without limitation, statements regarding the Company's future growth, results of operations, performance, future capital and other expenditures (including the amount, nature and sources of funding thereof), competitive advantages, business prospects and opportunities. These and other risks and uncertainties are described in greater detail in the section entitled "Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the Securities and Exchange Commission on March 15, 2023 as well as discussions of potential risks, uncertainties, and other important factors in the other filings that we make with the Securities and Exchange Commission from time to time. These documents are available through the Investor Menu, Financials section under "SEC filings" on the Investors page of our website at http://investors.maxcyte.com. No statement in the presentation is intended to be, or intended to be construed as, a profit forecast or profit estimate or to be interpreted to mean that earnings per Company share for the current or future financial years will necessarily match or exceed the historical earnings per Company share. As a result, no undue reliance should be placed on such statements. Any forward-looking statements represent our views only as of the date of this press release and should not be relied upon as representing our views as of any subsequent date. We explicitly disclaim any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise. No representations or warranties (expressed or implied) are made about the accuracy of any such forward-looking statements. 2 © 2023 MaxCyte, Inc. All Rights Reserved

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