X0202 SCHEDULE 13D/A 0000950103-26-005840 0001760624 XXXXXXXX LIVE 3 Class A Common Stock 04/22/2026 false 0001780312 00217D100 AST SpaceMobile, Inc.

c/o Rakuten Mobile, Inc. 1-14-1 Tamagawa, Setagaya-Ku Tokyo M0 158-0094

Hiroshi Mikitani 81-50-5581-6910 c/o Rakuten Mobile, Inc. 1-14-1 Tamagawa, Setagaya-Ku Tokyo M0 158-0094 0002035591 N Rakuten Mobile, Inc. OO N M0 21020155.00 0.00 21020155.00 0.00 21020155.00 N 7.2 CO (1) Comprised of 21,020,155 shares of Class A Common Stock of the Issuer. As discussed in Item 2 of this Schedule 13D/A, the other Stockholder Parties (as defined herein) are not included as reporting persons in this Schedule 13D/A, and the Reporting Persons expressly disclaim beneficial ownership of the shares of Class A Common Stock held by the other Stockholder Parties. (2) Calculations of the percentage of the shares of Class A Common Stock beneficially owned is based on 292,637,039 shares of Class A Common Stock outstanding as of February 26, 2026, as reported in the Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed by the Issuer with the SEC on March 2, 2026 (the "Form 10-K"). 0001760624 N Hiroshi Mikitani OO N M0 21020155.00 0.00 21020155.00 0.00 21020155.00 N 7.2 IN (1) Comprised of 21,020,155 of Class A Common Stock of the Issuer. Hiroshi Mikitani ("Mr. Mikitani") is the founder, Chairman and Chief Executive Officer of Rakuten Group, Inc. ("Rakuten Group") and Rakuten Mobile, Inc. ("Rakuten Mobile") and has voting and investment discretion with respect to the securities held of record by Rakuten Mobile. By reason of the provisions of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, Mr. Mikitani may be deemed to be the beneficial owner of the securities beneficially owned by Rakuten Mobile. Mr. Mikitani hereby disclaims beneficial ownership of all such securities, except to the extent of any indirect pecuniary interest therein. As discussed in Item 2 of this Schedule 13D, the other Stockholder Parties (as defined herein) are not included as reporting persons in this Schedule 13D, and the Reporting Persons expressly disclaim beneficial ownership of the shares of Class A Common Stock held by the other Stockholder Parties. (2) Calculations of the percentage of the shares of Class A Common Stock beneficially owned is based on 292,637,039 shares of Class A Common Stock outstanding as of February 26, 2026, as reported in the Annual Report on Form 10-K. 0001294591 N Rakuten Group, Inc. OO N M0 21020155.00 0.00 21020155.00 0.00 21020155.00 N 7.2 CO (1) Comprised of 21,020,155 of Class A Common Stock of the Issuer. Rakuten Mobile is a wholly-owned subsidiary of Rakuten Group. By reason of the provisions of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, Rakuten Group may be deemed to be the beneficial owner of the securities beneficially owned by Rakuten Mobile. Rakuten Group hereby disclaims beneficial ownership of all such securities, except to the extent of any indirect pecuniary interest therein. As discussed in Item 2 of this Schedule 13D, the other Stockholder Parties (as defined herein) are not included as reporting persons in this Schedule 13D, and the Reporting Persons expressly disclaim beneficial ownership of the shares of Class A Common Stock held by the other Stockholder Parties. (2) Calculations of the percentage of the shares of Class A Common Stock beneficially owned is based on 292,637,039 shares of Class A Common Stock outstanding as of February 26, 2026, as reported in the Annual Report on Form 10-K. Class A Common Stock AST SpaceMobile, Inc. c/o Rakuten Mobile, Inc. 1-14-1 Tamagawa, Setagaya-Ku Tokyo M0 158-0094 This Schedule 13D/A (this "Schedule 13D/A") amends and supplements the Schedule 13D filed by the Reporting Persons (as defined below) on April 6, 2021 (the "Original Schedule 13D"), as amended by Amendment No.1 filed on October 10, 2024 ("Amendment No. 1") and amended by Amendment No. 2 filed on April 16, 2026 ("Amendment No. 2") (the Original Schedule 13D, as amended and supplemented by Amendment No. 1, Amendment No. 2, and this Schedule 13D/A, the "Schedule 13D") with respect to the Class A Common Stock. Capitalized terms used in this Schedule 13D/A and not defined herein shall have the same meanings ascribed to them in the Original Schedule 13D. Item 3 of the Original Schedule 13D is hereby amended to add the following: The information set forth in Items 5 and 6 of this Schedule 13D/A is incorporated by reference into this Item 3. Item 5 of the Original Schedule 13D is hereby amended to add the following: Mr. Mikitani is the founder, Chairman and Chief Executive Officer of Rakuten Group and Rakuten Mobile and has voting and investment discretion with respect to the securities held of record by Rakuten Mobile. By reason of the provisions of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, Mr. Mikitani may be deemed to be the beneficial owner of the securities beneficially owned by Rakuten Mobile. Mr. Mikitani hereby disclaims beneficial ownership of all such securities, except to the extent of any indirect pecuniary interest therein. Amount beneficially owned: 21,020,155 shares of Class A Common Stock. Percent of Class: 7.2% Number of shares the Reporting Persons have: Sole power to vote or direct the vote: 21,020,155 shares of Class A Common Stock. Each share of Class A Common Stock carries one vote per share. Shared power to vote: 0 Sole power to dispose or direct the disposition of: 21,020,155 shares of Class A Common Stock. Shared power to dispose or direct the disposition of: 0 Calculations of the percentage of the shares of Class A Common Stock beneficially owned is based on 292,637,039 shares of Class A Common Stock outstanding as of February 26, 2026, as reported in the Annual Report on Form 10-K. Except as described in this Schedule 13D/A, during the past 60 days, the Reporting Persons effected the following transactions with respect to Class A Common Stock: Date: April 17, 2026 Transaction: Sale Number of Shares: 860,000 Average Price Per Share: $87.9255 Date: April 20, 2026 Transaction: Sale Number of Shares: 700,000 Average Price Per Share: $79.4141 Date: April 21, 2026 Transaction: Sale Number of Shares: 800,000 Average Price Per Share: $82.7550 Date: April 22, 2026 Transaction: Sale Number of Shares: 2,200,000 Average Price Per Share: $84.6923 Date: April 23, 2026 Transaction: Sale Number of Shares: 250,000 Average Price Per Share: $79.7797 Date: April 24, 2026 Transaction: Sale Number of Shares: 250,000 Average Price Per Share: $77.4017 The sales set forth above were effected pursuant to the Trading Plan in open market transactions. None. Not applicable. The information set forth or incorporated by reference in Items 3 and 5 of this Schedule 13D/A is incorporated by reference in its entirety into this Item 6. Except as set forth in the Schedule 13D, the Reporting Persons do not have any contracts, arrangements, understandings or relationships (legal or otherwise) with any person with respect to any securities of the Issuer, including but not limited to any contracts, arrangements, understandings or relationships concerning the transfer or voting of such securities, finder's fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or losses, or the giving or withholding of proxies. Rakuten Mobile, Inc. /s/ Atsushi Maeda 04/24/2026 Hiroshi Mikitani /s/ Hiroshi Mikitani 04/24/2026 Rakuten Group, Inc. /s/ Kentaro Hyakuno 04/24/2026