Sec Form 4 Filing - SINGER DAVID B @ Infleqtion, Inc. - 2026-05-21

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person SINGER DAVID B 2. Issuer Name and Ticker or Trading Symbol Infleqtion, Inc. [ INFQ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O INFLEQTION, INC., 1315 WEST CENTURY DRIVE, SUITE 150 3. Date of Earliest Transaction (MM/DD/YY) 05/21/2026 (Street) LOUISVILLE, CO80027 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/21/2026 S 55,939 D $ 14.6934 19,761 I See Footnotes ( 1 ) ( 8 ) Common Stock 05/21/2026 S 100,350 D $ 14.6934 35,450 I See Footnotes ( 2 ) ( 8 ) Common Stock 05/21/2026 S 1,432,671 D $ 14.6934 4,784,711 I See Footnotes ( 3 ) ( 8 ) Common Stock 05/21/2026 S 390,066 D $ 14.6934 137,795 I See Footnotes ( 4 ) ( 8 ) Common Stock 05/21/2026 S 2,262,112 D $ 14.6934 7,554,800 I See Footnotes ( 5 ) ( 8 ) Common Stock 05/21/2026 S 2,128,025 D $ 14.6934 751,744 I See Footnotes ( 6 ) ( 8 ) Common Stock 05/22/2026 S 19,761 D $ 17.0408 0 I See Footnotes ( 1 ) ( 8 ) Common Stock 05/22/2026 S 35,450 D $ 17.0408 0 I See Footnotes ( 2 ) ( 8 ) Common Stock 05/22/2026 S 1,669,369 D $ 16.7033 ( 7 ) 3,115,342 I See Footnotes ( 3 ) ( 8 ) Common Stock 05/22/2026 S 137,795 D $ 17.0408 0 I See Footnotes ( 4 ) ( 8 ) Common Stock 05/22/2026 S 2,635,848 D $ 16.7033 ( 7 ) 4,918,952 I See Footnotes ( 5 ) ( 8 ) Common Stock 05/22/2026 S 751,744 D $ 17.0408 0 I See Footnotes ( 6 ) ( 8 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other SINGER DAVID B C/O INFLEQTION, INC. 1315 WEST CENTURY DRIVE, SUITE 150 LOUISVILLE, CO80027 X Signatures /s/ Jason D. Hall, Attorney-in-Fact for David B. Singer 05/27/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Held directly by Maverick Long Fund, Ltd. ("Maverick Long Fund"). The Reporting Person may be deemed to have a pecuniary interest in such securities by virtue of his limited partner interest in Maverick Long Fund. ( 2 )Held directly by Maverick Fund II, Ltd. ("Maverick Fund II"). The Reporting Person may be deemed to have a pecuniary interest in such securities by virtue of his limited partner interest in Maverick Fund II. ( 3 )Held directly by Maverick Advisors Fund, L.P. ("Maverick Advisors Fund"). Maverick Capital Ventures, LLC ("Maverick Ventures") is the general partner of Maverick Advisors Fund. The Reporting Person is a managing partner of Maverick Ventures. ( 4 )Held directly by Maverick Designated Investments Fund, L.P. ("MDI"). The Reporting Person may be deemed to have a pecuniary interest in such securities by virtue of his indirect limited partner interest in MDI. ( 5 )Held directly by Maverick Ventures Investment Fund, L.P. ("Maverick Ventures Fund"). Maverick Ventures is the general partner of Maverick Ventures Fund. ( 6 )Held directly by Maverick Silicon Fund, L.P. ("Maverick Silicon Fund"). The Reporting Person may be deemed to have a pecuniary interest in such securities by virtue of his limited partner interest in Maverick Silicon Fund. ( 7 )The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.5565 to $17.0408 inclusive. The Reporting Person undertakes to provide the Issuer, any securityholder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within such range. ( 8 )The Reporting Person disclaims, for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended, beneficial ownership of these securities, except to the extent of his pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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