15.7% ScanTech AI (STAI) stake reported in Schedule 13D amendment

Rhea-AI Filing Summary

ScanTech AI Systems Inc. major shareholders filed Amendment No. 3 to a Schedule 13D reporting their current stake in the company. Seaport Global Asset Management LLC, Seaport Group SIBS LLC, and Stephen C. Smith report beneficial ownership of 731,867 shares of common stock, representing 15.7% of the class, based on 4,663,381 shares outstanding. All voting and dispositive power over these shares is reported as shared among the reporting persons.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 3)

ScanTech AI Systems Inc.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

80603V203

(CUSIP Number)

Stephen C. Smith
360 Madison Avenue, 22nd Floor
New York, NY, 10017
(212) 616-7700

Louis Rambo
Proskauer Rose LLP, 1001 Pennsylvania Ave. NW, Suite 600
Washington, DC, 20004
(202) 416-6800

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

02/10/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP No. 80603V203

1

Name of reporting person

Seaport Global Asset Management LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

NEW YORK

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 731,867.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 731,867.00

11

Aggregate amount beneficially owned by each reporting person

731,867.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

15.7 %

14

Type of Reporting Person (See Instructions)

IA, HC

SCHEDULE 13D

CUSIP No. 80603V203

1

Name of reporting person

Seaport Group SIBS LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 731,867.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 731,867.00

11

Aggregate amount beneficially owned by each reporting person

731,867.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

15.7 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

CUSIP No. 80603V203

1

Name of reporting person

Stephen C. Smith

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 731,867.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 731,867.00

11

Aggregate amount beneficially owned by each reporting person

731,867.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

15.7 %

14

Type of Reporting Person (See Instructions)

IN, HC

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $0.0001 per share
(b)	Name of Issuer: ScanTech AI Systems Inc.
(c)	Address of Issuer's Principal Executive Offices: 1735 Enterprise Drive, Buford, GEORGIA , 30518.
Item 5.	Interest in Securities of the Issuer
(a)	Items 5(a)-(c) of the Schedule 13D are amended and supplemented as follows: The information set forth in rows 11 and 13 of the cover pages to this Schedule 13D is incorporated herein by reference. The percentages set forth in row 13 are based on 4,663,381 shares of Common Stock outstanding, as reported by the Issuer to the Reporting Persons.
(b)	The information set forth in rows 7 through 10 of the cover pages to this Schedule 13D is incorporated herein by reference.
(c)	Schedule A to this Amendment No. 3 is incorporated by reference into this Item 5(c). Other than with respect to the transactions set forth in the disclosure incorporated by reference to this Item 5(c), none of the Reporting Persons has effected any transaction in the Issuer's securities since the filing of Amendment No. 2 to the Schedule 13D on December 18, 2025.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Seaport Global Asset Management LLC

Signature:	/s/ Stephen C. Smith
Name/Title:	Stephen C. Smith, Authorized Signatory
Date:	02/12/2026

Seaport Group SIBS LLC

Signature:	/s/ Stephen C. Smith
Name/Title:	Stephen C. Smith, Authorized Signatory
Date:	02/12/2026

Stephen C. Smith

Signature:	/s/ Stephen C. Smith
Name/Title:	Stephen C. Smith
Date:	02/12/2026

FAQ

What percentage of ScanTech AI Systems Inc. (STAI) is owned by the reporting group?

The reporting group holds a 15.7% beneficial ownership in ScanTech AI Systems Inc. This corresponds to 731,867 shares of common stock, based on 4,663,381 shares outstanding as reported by the company to the reporting persons.

How many ScanTech AI Systems Inc. (STAI) shares are beneficially owned by the reporting persons?

The reporting persons collectively report beneficial ownership of 731,867 shares of ScanTech AI Systems Inc. common stock. This stake represents 15.7% of the outstanding shares, calculated using 4,663,381 shares of common stock outstanding as provided by the issuer.

Who are the reporting persons in the ScanTech AI Systems Inc. Schedule 13D/A?

The Schedule 13D/A lists Seaport Global Asset Management LLC, Seaport Group SIBS LLC, and Stephen C. Smith as reporting persons. Each reports shared voting and dispositive power over the same 731,867 shares of ScanTech AI Systems Inc. common stock.

What type of ownership power do the ScanTech AI (STAI) reporting persons have over their shares?

Each reporting person shows 0 shares with sole voting or dispositive power and 731,867 shares with shared voting and shared dispositive power. This means decisions regarding these shares are made jointly, rather than individually, by the reporting persons.

What share count did ScanTech AI Systems Inc. report as outstanding in this Schedule 13D/A?

The filing states that the 4,663,381 shares of common stock outstanding figure was reported by ScanTech AI Systems Inc. to the reporting persons. The 15.7% ownership percentage for the group is calculated using this outstanding share count as the denominator.

What event date triggered Amendment No. 3 to the ScanTech AI Systems Inc. Schedule 13D?

The Schedule 13D/A identifies February 10, 2026 as the date of the event requiring the filing. The amendment updates the reporting persons’ disclosure of their beneficial ownership in ScanTech AI Systems Inc. common stock as of that event date.