425

425 1 d139536d425.htm 425 425

Filed by SkyWater Technology, Inc.

Pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12

under the Securities Act of 1934

Subject Company: SkyWater Technology, Inc.

Commission File No.: 001-40345

Date: April 21, 2026

LOGO

April 21, 2026

The important Special Meeting of SkyWater Technology, Inc. Stockholders is fast

approaching—please take a moment of your time to vote your shares TODAY!

Dear Fellow Stockholder:

According to our latest records, we have not yet received your vote for the upcoming Special Meeting at which we seek your approval of the proposed acquisition by IonQ. Your Board of Directors unanimously recommends that you vote FOR the Merger Agreement proposal and related proposal.

Remember, because not voting will have the same effect as voting against the Merger Agreement proposal, your vote is extremely important. To ensure that your shares are represented, we encourage you to take a moment of your time to vote by Internet or by telephone—TODAY. If you received this letter by email, you may simply click on the “VOTE NOW” link provided in the email.

On behalf of SkyWater Technology, thank you for your support.

Sincerely,

Christopher Hilberg

Secretary

YOUR VOTE IS IMPORTANT—PLEASE VOTE TODAY!

You can vote your shares online or by phone; please just follow

the easy instructions on the enclosed proxy card.

(If you received this letter by email, you may simply click on the

“VOTE NOW” link provided in the email.)

If you have any questions or need assistance in voting

your shares, please call our proxy solicitor:

INNISFREE M&A INCORPORATED

(888) 750-5835 (toll-free from the U.S. and Canada) or

+1 (412) 232-3651 (from other countries)

* * * *

Required Disclosures

Important Information and Where to Find It

In connection with the proposed transaction (the “Transaction”) between IonQ, Inc. (“IonQ”) and SkyWater Technology, Inc. (“SkyWater”), IonQ has filed with the Securities and Exchange Commission (the “SEC”) a Registration Statement on Form S-4 (the “Registration Statement”), which included a preliminary prospectus with respect to the shares of IonQ common stock (the “IonQ Shares”) to be issued in the Transaction and a preliminary proxy statement for SkyWater’s stockholders. The Registration Statement was declared effective on March 31, 2026, and the definitive proxy statement/prospectus was mailed to stockholders of SkyWater on the same date. This communication is not a substitute for the Registration Statement, the proxy statement/prospectus or any other document that IonQ or SkyWater may file with the SEC or mail to SkyWater’s stockholders in connection with the Transaction. INVESTORS AND SECURITY HOLDERS OF IONQ AND SKYWATER ARE URGED TO READ THE REGISTRATION STATEMENT AND THE PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE REGISTRATION STATEMENT AND THE PROXY STATEMENT/PROSPECTUS (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO), BECAUSE THEY CONTAIN IMPORTANT INFORMATION REGARDING IONQ, SKYWATER, THE TRANSACTION AND RELATED MATTERS. The documents filed by IonQ and SkyWater with the SEC may be obtained free of charge through the website maintained by the SEC at www.sec.gov. The documents filed by IonQ with the SEC also may be obtained free of charge at IonQ’s website at investors.IonQ.com. The documents filed by SkyWater with the SEC also may be obtained free of charge at SkyWater’s website at ir.skywatertechnology.com.

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, is included in the definitive proxy statement/prospectus, which has been filed with the SEC. To the extent that holdings of SkyWater’s securities by the directors and executive officers of SkyWater have changed from the amounts set forth in the definitive proxy statement/prospectus, such changes have been or will be reflected on Statements of Changes in Beneficial Ownership on Form 4 filed 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. Free copies of these documents may be obtained as described above.

SEC Form 425 filed by SkyWater Technology Inc.