Filed pursuant to Rule 424(b)(3)

Registration No. 333-256659

PROSPECTUS SUPPLEMENT No. 5

(To Prospectus Dated June 23, 2022)

Garrett Motion Inc.

37,680,203 Shares of Common Stock

219,552,835 Shares of Series A Cumulative Convertible Preferred Stock

219,552,835 Shares of Common Stock Issuable Upon Conversion of Series A

Cumulative Convertible Preferred Stock

This prospectus supplement no. 5 supplements the prospectus dated June 23, 2022 (the “Prospectus”) filed pursuant to the Securities Act of 1933, as amended, by Garrett Motion Inc. Pursuant to the Prospectus, this prospectus supplement relates to the offer and sale by the selling security holders identified in the Prospectus of up to (i) 219,552,835 shares of our Series A Cumulative Convertible Preferred Stock (the “Series A Preferred Stock”), (ii) 37,680,203 shares of our common stock, par value $0.001 per share (the “Common Stock” and together with the Series A Preferred Stock, the “Securities”) and (iii) 219,552,835 shares of our Common Stock issuable upon conversion of the Series A Preferred Stock.

This prospectus supplement incorporates into the Prospectus the information contained in our attached:

You should read this prospectus supplement in conjunction with the Prospectus, including any supplements and amendments thereto. This prospectus supplement is qualified by reference to the Prospectus except to the extent that the information in this prospectus supplement supersedes the information contained in the Prospectus.

This prospectus supplement is not complete without, and may not be delivered or utilized except in connection with, the Prospectus.

Our Common Stock is quoted on the Nasdaq Global Select Market (“Nasdaq”) under the symbol “GTX.” Our Series A Preferred Stock is quoted on the Nasdaq under the symbol “GTXAP”.

Investing in our Securities involves risks. Please see “Risk Factors” beginning on page 4 of the Prospectus.

Neither the SEC nor any state securities commission has approved or disapproved of these securities or passed on the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is November 8, 2022.

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. ☐

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

Date of Report (Date of earliest event reported): November 2, 2022

GARRETT MOTION INC.

(Exact name of Registrant as specified in its charter)

+41 21 695 30 00

(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:

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 ☐

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. ☐

On November 2, 2022, the Board of Directors of Garrett Motion Inc. (the “Company”) extended the Company’s existing $100 million share repurchase program by one year, to November 15, 2023. As of September 30, 2022, approximately $76 million remained under the program for purchases of the Company’s common stock and Series A preferred stock. The share repurchase program is described further in the Company’s Quarterly Report on Form 10-Q for the period ended September 30, 2022, filed with the Securities and Exchange Commission on October 26, 2022.

SIGNATURE

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