螺栓项目控股有限公司美股招股说明书(2025-10-20版)

Prospectus Supplement No. 10(To Prospectus dated April 3, 2025) BOLT PROJECTS HOLDINGS, INC. This prospectus supplement updates, amends and supplements the prospectus dated April 3, 2025 (the “Prospectus”), which forms apart of our Registration Statement on Form S-1 (Registration No. 333-286083). Capitalized terms used in this prospectus supplementand not otherwise defined herein have the meanings specified in the Prospectus. This prospectus supplement is being filed to update, amend and supplement the information included in the Prospectus with theinformation contained in our Current Report on Form 8-K, filed with the Securities and Exchange Commission (“SEC”) on October17, 2025, which is set forth below. This prospectus supplement is not complete without the Prospectus. This prospectus supplement should be read in conjunction withthe Prospectus, which is to be delivered with this prospectus supplement, and is qualified by reference thereto, except to the extent thatthe information in this prospectus supplement updates or supersedes the information contained in the Prospectus. Please keep thisprospectus supplement with your Prospectus for future reference. INVESTING IN OUR SECURITIES INVOLVES CERTAIN RISKS. SEE “RISK FACTORS” BEGINNING ON PAGE 7 OF THEPROSPECTUS. Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if the Prospectusor this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense. The date of this prospectus supplement is October 17, 2025 UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549 FORM 8-K CURRENT REPORTPURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 17, 2025 Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrantunder any of the following provisions: ☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) 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(Sec.230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (Sec.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 forcomplying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year On October 17, 2025, the Board of Directors of Bolt Projects Holdings, Inc. (the Company) approved and adopted amendments to theCompanys Amended and Restated Bylaws (the Amended and Restated Bylaws), which became effective the same day. Among otherthings, the amendments contained in the Amended and Restated Bylaws: ●reduce the quorum needed for stockholder meetings to one-third (33.33%) of the Companys voting power of the issued andoutstanding shares of capital stock of the Company entitled to vote thereat, present in person or represented by proxy;●address the universal proxy rules adopted by the U.S. Securities and Exchange Commission, by clarifying that no person maysolicit proxies in support of a director nominee other than the Boards nominees unless such person has complied with Rule14a-19 under the Securities Exchange Act of 1934, as amended, including applicable notice and solicitation requirements;●establish procedural mechanics and disclosure requirements in connection with stockholder nominations of directors andsubmissions of proposals regarding other business at stockholder meetings, including, without limitation: requiring certainbackground information and disclosures regarding proposing stockholders, proposed nominees and business, and otherpersons related to a stockholders solicitation of proxies; regarding the proposed nominees, including a representation thatsuch candidate intends to serve the entire term, if elected; and prohibiting a stockholder from nominating a greater number ofdirector candidates than are subject to election by stockholders at the applicable meeting;●require that a stockholder directly or indirectly soliciting proxies from other stockholders use a proxy card color other thanwhite, which will be reserved for exclusive use by the Board;●update those who may preside at meetings of stockholders and the scope of such persons rights and authority at suchmeetings; and●update ho