[425] SkyWater Technology, Inc Business Combination Communication

Participants in the Solicitation

IonQ, SkyWater and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of
proxies from the stockholders of SkyWater in connection with the Transaction under the rules of the SEC. Information about the interests of the directors and executive officers of IonQ and SkyWater and other persons who may be deemed to be
participants in the solicitation of stockholders of SkyWater in connection with the Transaction and a description of their direct and indirect interests, by security holdings or otherwise, will be included in the Proxy Statement/Prospectus, which
will be filed with the SEC. Information about SkyWater’s directors and executive officers is set forth in SkyWater’s proxy statement for its 2025 Annual Meeting of Stockholders on Schedule 14A filed with the SEC on April 8, 2025,
SkyWater’s Annual Report on Form 10-K for the year ended December 29, 2024 and any subsequent filings with the SEC. Information about certain of IonQ’s directors and executive officers is set
forth in IonQ’s proxy statement for its 2025 Annual Meeting of Stockholders on Schedule 14A filed with the SEC on April 28, 2025 and any subsequent filings with the SEC. Additional information regarding the direct and indirect interests
of those persons and other persons who may be deemed participants in the Transaction may be obtained by reading the Proxy Statement/Prospectus regarding the Transaction when it becomes available. Free copies of these documents may be obtained as
described above.

No Offer or Solicitation

This communication is for informational purposes only and does not constitute, or form a part of, an offer to sell or the solicitation of an
offer to buy any securities or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the
securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act, as amended, and otherwise in accordance with applicable law.

Note to Investors Regarding Forward-Looking Statements

This document contains “forward-looking statements” within the meaning of the federal securities laws, including Section 27A
of the U.S. Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements contained in this document other than statements of historical fact are forward-looking statements. These
forward-looking statements are based on IonQ’s and SkyWater’s current expectations, estimates and projections about the expected date of closing of the Transaction and the potential benefits thereof, their respective businesses and
industries, management’s beliefs and certain assumptions made by IonQ and SkyWater, all of which are subject to change. All forward-looking statements by their nature address matters that involve risks and uncertainties, many of which are
beyond our control and are not guarantees of future results, such as statements about the consummation of the Transaction and the anticipated benefits thereof. These and other forward-looking statements, including the failure to consummate the
Transaction or to make or take any filing or other action required to consummate the transactions in a timely matter or at all, are not guarantees of future results and are subject to risks, uncertainties and assumptions that could cause actual
results to differ materially from those expressed in any forward-looking statements. Accordingly, there are or will be important factors that could cause actual results to differ materially from those indicated in such statements and, therefore, you
should not place undue reliance on any such statements and caution must be exercised in relying on forward-looking statements. Important risk factors that may cause such a difference include, but are not limited to: (i) the completion of the
Transaction on anticipated terms and timing, including obtaining stockholder and regulatory approvals, anticipated tax treatment, unforeseen liabilities, future capital expenditures, revenues, expenses, earnings, synergies, economic performance,
indebtedness, financial condition, losses, future prospects, business and management strategies, expansion and growth of SkyWater’s and IonQ’s businesses and other conditions to the completion of the Transaction; (ii) failure to
realize the anticipated benefits of the Transaction, including as a result of delay in completing the transactions or integrating the businesses of IonQ and SkyWater; (iii) IonQ’s and SkyWater’s ability to implement their business
strategies; (iv) potential litigation relating to the Transaction that could be instituted against IonQ, SkyWater or their respective directors; (v) the risk that disruptions from the Transaction will harm IonQ’s or SkyWater’s
businesses, including current plans and operations; (vi) the ability of IonQ or SkyWater to retain and hire key personnel; (vii) potential adverse reactions or changes to

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