Mobix Labs Inc. - 美股招股说明书（2026年4月9日版）

PROSPECTUS SUPPLEMENT NO. 2 MOBIX LABS, INC.UP TO 2,412,711 SHARES OF CLASS A COMMON STOCK This prospectus supplement amends the prospectus dated March 12, 2026 (as supplemented to date, the “Prospectus”) ofMobix Labs, Inc. a Delaware corporation (the “Company”), which forms a part of the Company’s Registration Statement on Form S-1,as amended (No. 333-290247). This prospectus supplement is being filed to update and supplement the information included orincorporated by reference in the Prospectus with the information contained in the Current Report on Forms 8-K filed with the Shares of our Class A Common Stock are listed on the Nasdaq Stock Market LLC (“Nasdaq”) under the symbol “MOBX”.On April 8, 2026, the closing price of our Class A Common Stock was $3.04. Investing in the Company’s Class A Common Stock involves risks. See “Risk Factors” beginning on page 5 of theProspectus and under similar headings in any amendments or supplements to the Prospectus. Neither the SEC nor any other regulatory body has approved or disapproved of these securities or passed upon theadequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense. The date of this Prospectus Supplement No. 2 is April 9, 2026