NPA New Povidence Acquisition Corporation

Filed pursuant to Rule 424(b)(3)

Registration No. 333-257425

PROSPECTUS SUPPLEMENT NO. 1

(to prospectus dated July 2, 2021)

AST SPACEMOBILE, INC.

141,538,066 SHARES OF CLASS A COMMON STOCK

This prospectus supplement is being filed to update and supplement the information contained in the prospectus dated July 2, 2021 (the “Prospectus”), related to the possible issuance of up to 141,538,066 shares of Class A common stock, par value $0.0001 per share (the “Class A Common Stock”), of AST SpaceMobile, Inc., a Delaware corporation, in exchange for units of ownership interest (“AST Common Units”) in AST & Science, LLC, a Delaware limited liability company (“AST”), tendered for redemption by one or more of the members of AST, including those who become members of AST upon exercise of AST Incentive Equity Options (as defined below), pursuant to their contractual rights, and including the possible resale from time to time of some or all of such shares of common stock by the selling stockholders named in the Prospectus, with the information contained in our Current Report on Form 8-K, filed with the Securities and Exchange Commission (“SEC”) on July 9, 2021 (the “Current Report”). Accordingly, we have attached the Current Report to this prospectus supplement.

This prospectus supplement updates and supplements the information in the Prospectus and is not complete without, and may not be delivered or utilized except in combination with, the Prospectus, including any amendments or supplements thereto. This prospectus supplement should be read in conjunction with the Prospectus and if there is any inconsistency between the information in the Prospectus and this prospectus supplement, you should rely on the information in this prospectus supplement.

Our shares of Class A Common Stock are listed on The Nasdaq Capital Market LLC (“Nasdaq”) under the symbol “ASTS.” On July 8, 2021, the closing sale price per share of our Class A Common Stock was $12.46.

Investing in shares of our Class A Common Stock involves risks that are described in the “Risk Factors” section beginning on page 5 of the Prospectus.

Neither the SEC nor any state securities commission has approved or disapproved of the securities to be issued under the Prospectus or determined if the Prospectus or this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is July 9, 2021.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

(432) 276-3966

Registrant’s telephone number, including area code

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company [X]

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. [  ]

Item 4.01 Changes in Registrant’s Certifying Accountant.

Marcum LLP (“Marcum”) served as the independent registered public accounting firm for AST SpaceMobile, Inc., a Delaware corporation formerly known as New Providence Acquisition Corp. (the “Company”), and its subsidiaries for the period from May 28, 2019 (inception) through the year ended December 31, 2020, and the subsequent interim period until July 6, 2021. On July 6, 2021, the Audit Committee of the Board of Directors of the Company approved the change in the Company’s independent registered public accounting firm, effective July 6, 2021, to KPMG LLP (“KPMG”).

Marcum’s report on the Company’s financial statements as of December 31, 2020 and 2019, and for the year ended December 31, 2020 and the period from May 28, 2019 (inception) through December 31, 2019, did not contain an adverse opinion or disclaimer of opinion, nor were such reports qualified or modified as to uncertainty, audit scope or accounting principles, except that such audit report contained an explanatory paragraph in which Marcum expressed substantial doubt as to the Company’s ability to continue as a going concern if it did not complete a business combination. During the period of Marcum’s engagement by the Company, and the subsequent interim period preceding Marcum’s dismissal, there were no disagreements with Marcum on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure, which disagreements if not resolved to the satisfaction of Marcum, would have caused it to make a reference to the subject matter of the disagreement in connection with its reports covering such periods. In its Annual Report on Form 10-K/A, the Company disclosed control deficiencies which are material weaknesses. No other “reportable events,” as defined in Item 304(a)(1)(v) of Regulation S-K, occurred within the period of Marcum’s engagement and subsequent interim period preceding Marcum’s dismissal.

During the period from May 28, 2019 (inception) through December 31, 2020 and the subsequent interim period preceding the engagement of KPMG, neither the Company nor anyone on its behalf consulted KPMG regarding either: (i) the application of accounting principles to a specified transaction, either completed or proposed; or the type of audit opinion that might be rendered on the Company’s financial statements, and neither a written report was provided to the Company or oral advice was provided that KPMG concluded was an important factor considered by the Company in reaching a decision as to the accounting, auditing, or financial reporting issue; or (ii) any matter that was the subject of a disagreement (as described in Item 304(a)(1)(iv) of Regulation S-K) or a “reportable event” (as described in Item 304(a)(1)(v) of Regulation S-K)

The Company provided Marcum with a copy of the disclosures made pursuant to this Item 4.01 prior to the filing of this Current Report on Form 8-K and requested that Marcum furnish a letter addressed to the Securities and Exchange Commission, as required by Item 304(a)(3) of Regulation S-K, which is attached hereto as Exhibit 16.1, stating whether it agrees with such disclosures, and if not, stating the respects in which it does not agree.

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