X0202 SCHEDULE 13D/A 0001012975-26-000188 0000934639 XXXXXXXX LIVE 1 Common Stock, $0.0001 par value per share 05/21/2026 false 0002007825 45676K103 Infleqtion, Inc.

1315 West Century Drive Suite 150 Louisville CO 80027

Maverick Capital, Ltd. (214) 880-4000 Attn: Legal Department 1900 N. Pearl Street, 20th Floor Dallas TX 75201 Y MCV Management Company, LLC AF N DE 0 8069034 0 8069034 8069034 N 3.6 IA OO 0001286655 N Maverick Capital Management, LLC AF N TX 0 8069034 0 8069034 8069034 N 3.6 OO 0001632191 N Maverick Ventures Investment Fund, L.P. WC N DE 0 4953692 0 4953692 4953692 N 2.3 PN 0001632167 N Maverick Advisors Fund, L.P. WC N DE 0 3115342 0 3115342 3115342 N 1.4 PN 0001632173 N Maverick Capital Ventures, LLC AF N DE 0 8069034 0 8069034 8069034 N 3.6 OO 0002055345 N Maverick Silicon Fund, L.P. WC N DE 0 0 0 0 0 N 0 PN 0000913446 N Maverick Fund USA, Ltd. WC N TX 0 0 0 0 0 N 0 PN Y Maverick Designated Investments Fund, L.P. WC N E9 0 0 0 0 0 N 0 PN 0001979415 N Maverick Long Fund, Ltd. WC N E9 0 0 0 0 0 N 0 CO 0001979196 N Maverick Long Enhanced Fund, Ltd. WC N E9 0 0 0 0 0 N 0 CO 0000851056 N Maverick Fund II, Ltd. WC N E9 0 0 0 0 0 N 0 CO 0000934639 N Maverick Capital, Ltd. AF N TX 0 8069034 0 8069034 8069034 N 3.6 PN 0001286654 N Lee S. Ainslie III AF N X1 0 8069034 0 8069034 8069034 N 3.6 IN 0001240366 N David B. Singer AF N X1 0 8069034 0 8069034 8069034 N 3.6 IN Y Maverick Silicon, L.P. AF N DE 0 0 0 0 0 N 0 PN IA Common Stock, $0.0001 par value per share Infleqtion, Inc. 1315 West Century Drive Suite 150 Louisville CO 80027 Item 5 of the Schedule 13D is amended and supplemented as follows: The information set forth in rows 11 and 13 of the cover pages to this Schedule 13D is incorporated by reference. The percentages set forth in row 13 are based on 218,196,891 Shares outstanding as of May 12, 2026, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 15, 2026, and assume the exercise of options beneficially owned by certain of the Reporting Persons for an aggregate of 34,740 Shares. Mr. Singer holds options immediately exercisable for 34,740 Shares. Maverick Ventures Fund has the right to receive the director compensation provided in respect of Mr. Singer's board service through a management fee offset. The information set forth in rows 7 through 10 of the cover pages to this Schedule 13D is incorporated by reference. Except as set forth on Schedule A attached hereto, none of the Reporting Persons has effected any transactions of securities of the Issuer during the past 60 days. No person other than the Reporting Persons disclosed in this Schedule 13D is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Shares subject to this Schedule 13D. As of May 22, 2026, each of the Reporting Persons has ceased to be the beneficial owner of more than five percent of outstanding Shares of the Issuer. Item 7 of the Schedule 13D is amended and supplemented as follows: Exhibit 99.4 Schedule A MCV Management Company, LLC By Maverick Capital, Ltd. 05/26/2026 By Maverick Capital Management, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Maverick Capital Management, LLC /s/ Trevor Wiessmann* 05/26/2026 Maverick Ventures Investment Fund, L.P. By Maverick Capital Ventures, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Maverick Advisors Fund, L.P. By Maverick Capital Ventures, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Maverick Capital Ventures, LLC /s/ Trevor Wiessmann* 05/26/2026 Maverick Silicon Fund, L.P. By Maverick Silicon Fund GP, LLC 05/26/2026 By Maverick Capital Management, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Maverick Fund USA, Ltd. By Maverick Capital Ltd 05/26/2026 By Maverick Capital Management, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Maverick Designated Investments Fund, L.P. By Maverick Capital Ltd 05/26/2026 By Maverick Capital Management, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Maverick Long Fund, Ltd. By Maverick Capital Ltd 05/26/2026 By Maverick Capital Management, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Maverick Long Enhanced Fund, Ltd. By Maverick Capital, Ltd 05/26/2026 By Maverick Capital Management, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Maverick Fund II, Ltd. By Maverick Capital, Ltd 05/26/2026 By Maverick Capital Management, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Maverick Capital, Ltd. By Maverick Capital Management, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 Lee S. Ainslie III /s/ Trevor Wiessmann* 05/26/2026 David B. Singer /s/ Trevor Wiessmann** 05/26/2026 Maverick Silicon, L.P. By Maverick Capital Management, LLC 05/26/2026 /s/ Trevor Wiessmann* 05/26/2026 *Under Power of Attorney dated March 15, 2018; **Under Power of Attorney dated January 28, 2026