8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or Section 15(d) ofthe Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): December 11, 2025

ScanTech AI Systems Inc.

(Exact name of registrant as specified in its charter)

+1 (470) 655-0886

(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 to the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

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. ¨

To the extent required by Item 3.03 of Form 8-K, the information contained in Item 5.03 of this Current Report on Form 8-K (the “Current Report”) is incorporated herein by reference.

On December 11, 2025, ScanTech AI Systems Inc. (the “Company”) filed a certificate of amendment to the Company’s Amended and Restated Certificate of Incorporation (the “Amendment”) with the Secretary of State of the State of Delaware to effectuate a 1-for-20 reverse stock split (the “Reverse Stock Split”) of the outstanding shares of the Company’s common stock, par value $0.0001 per share (“Common Stock”). The Company’s stockholders previously approved future reverse stock splits and granted the board of directors the authority to determine the exact split ratios and when to proceed with any such reverse stock splits at the Company’s Annual Meeting of Stockholders (“Annual Meeting”) held on November 21, 2025.

The Reverse Stock Split will become effective on December 15, 2025, at 5:00 p.m., Eastern Time (the “Effective Time”) and the Common Stock is expected to begin trading on The Nasdaq Stock Market on a Reverse Stock Split-adjusted basis on December 16, 2025, at market open under the existing ticker symbol, “STAI.” As of the Effective Time, every 20 shares of the Company’s issued and outstanding Common Stock will be combined into one share of Common Stock.

The par value and other terms of the Common Stock will not be affected by the Reverse Stock Split. The Company’s post-Reverse Stock Split Common Stock CUSIP number will be 80603V203.

No fractional shares will be issued as a result of the Reverse Stock Split. Stockholders of record who would otherwise be entitled to receive a fractional share of Common Stock will receive a cash payment in lieu thereof at a price equal to the fraction to which the stockholder would otherwise be entitled multiplied by the closing price per share of the Common Stock (as adjusted for the Reverse Stock Split) on the Nasdaq Stock Market on December 15, 2025.

The foregoing description of the Amendment is qualified in its entirety by reference to the Amendment, a copy of which is filed as Exhibit 3.1 to this Current Report and is incorporated herein by reference.

Forward-Looking Statements

This Current Report includes forward-looking statements. These statements are made under the “safe harbor” provisions of the U.S. Private Securities Litigation Reform Act of 1995. These statements may be identified by words such as “will,” “would,” “expected,” or the negative of such terms, or other comparable terminology, and include statements about the Reverse Stock Split and the impacts, if any, on the Company’s Common Stock. Forward-Looking statements are statements that are not historical facts. Such forward-looking statements are not guarantees of future performance and are subject to risks and uncertainties, which could cause actual results to differ materially from the forward-looking statements contained herein due to many factors. These forward-looking statements and such risks, uncertainties and other factors speak only as of the date of this Current Report, and the Company expressly disclaims any obligation or undertaking to update or revise any forward-looking statement contained herein, or to reflect any change in our expectations with regard thereto or any other change in events, conditions, or circumstances on which any such statement is based, except to the extent otherwise required by applicable law.

(d) Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Exhibit 3.1

CERTIFICATEOF AMENDMENT TO

THE AMENDEDAND RESTATED CERTIFICATE OF INCORPORATION

OF

SCANTECHAI SYSTEMS INC.

(Pursuant to Sections 228 and 242 of the

General Corporation Law of the State of Delaware)

This Certificate of Amendment (this “Certificate of Amendment”) to the Amended and Restated Certificate of Incorporation was duly adopted in accordance with Sections 228 and 242 of the General Corporation Law of the State of Delaware (“Delaware Corporation Law”) and the amendments set forth below shall become effective upon the filing and effectiveness pursuant to the Delaware Corporation Law of this Certificate of Amendment to the Amended and Restated Certificate of Incorporation of the Company:

1. Article FOURTH of the Amended and Restated Certificate of Incorporation of the Company is hereby amended by adding the following paragraph at the end thereof:

“Upon the filing and effectiveness (the “Effective Time”) pursuant to the Delaware Corporation Law of this Certificate of Amendment to the Amended and Restated Certificate of Incorporation of the Corporation, as amended, each twenty (20) share(s) of the Corporation’s common stock, par value $0.0001 per share (the “Common Stock”), issued and outstanding immediately prior to the Effective Time shall automatically be combined into one (1) validly issued, fully paid and non-assessable share of Common Stock without any further action by the Corporation or the holder thereof (the “Reverse Stock Split”). No fractional shares will be issued as a result of the Reverse Stock Split and, in lieu thereof, (a) with respect to holders of one or more certificates, if any, which formerly represented shares of Common Stock that were issued and outstanding immediately prior to the Effective Time, upon surrender after the Effective Time of such certificate or certificates, any holder who would otherwise be entitled to a fractional share of Common Stock as a result of the Reverse Stock Split, following the Effective Time, shall be entitled to receive a cash payment (the “Fractional Share Payment”) equal to the fraction of which such holder would otherwise be entitled multiplied by the closing price per share of Common Stock on the date of the Effective Time as reported by The Nasdaq Global Market; provided that, whether or not fractional shares would be issuable as a result of the Reverse Stock Split shall be determined on the basis of (i) the total number of shares of Common Stock that were issued and outstanding immediately prior to the Effective Time formerly represented by certificates that the holder is at the time surrendering and (ii) the aggregate number of shares of Common Stock after the Effective Time into which the shares of Common Stock formerly represented by such certificates shall have been reclassified; and (b) with respect to holders of shares of Common Stock in book-entry form in the records of the Corporation’s transfer agent that were issued and outstanding immediately prior to the Effective Time, any holder who would otherwise be entitled to a fractional share of Common Stock as a result of the Reverse Stock Split (after aggregating all fractional shares), following the Effective Time, shall be entitled to receive the Fractional Share Payment automatically and without any action by the holder.”

2. This Certificate of Amendment shall become effective on December 15, 2025 at 5:00 p.m. Eastern Time.

3. Except as set forth in this Certificate of Amendment, the Amended and Restated Certificate of Incorporation, as amended, remains in full force and effect.

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IN WITNESS WHEREOF, ScanTech AI Systems Inc. has caused this Certificate of Amendment to be signed by its duly authorized officer this 11^th^ day of December, 2025.

[Signature Page to Certificate of Amendment]