Document

424B3 1 a2026-q1424b32025earnings3.htm 424B3 Document

Filed pursuant to Rule 424(b)(3)

SEC File No. 333-288742

PROSPECTUS SUPPLEMENT NO. 4

(to Prospectus dated August 7, 2025)

Blaize Holdings, Inc.

20,326,158 Shares of Common Stock by the Selling Stockholder

769,231 Shares of Common Stock by Cantor

This prospectus supplement updates, amends and supplements the prospectus dated December 18, 2025 (as supplemented or amended from time to time, the “Prospectus”), which forms a part of our Registration Statement on Form S-1 (Registration No. 333-288742). Capitalized terms used in this prospectus supplement and 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 information contained in our Annual Report on Form 10-K filed with the SEC on March 24, 2026, which is set forth below.

This prospectus supplement is not complete without the Prospectus. This prospectus supplement should be read in conjunction with the Prospectus, which is to be delivered with this prospectus supplement, and is qualified by reference thereto, except to the extent that the information in this prospectus supplement updates or supersedes the information contained in the Prospectus. Please keep this prospectus supplement with your Prospectus for future reference.

Our Common Stock and Warrants are listed on the Nasdaq Stock Market LLC under the trading symbols “BZAI” and “BZAIW,” respectively. On March 23, 2026, the closing prices for our Common Stock and Warrants on the Nasdaq Stock Market LLC were $1.10 per share of Common Stock and $0.30 per Warrant.

Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page 12 of the Prospectus and other risk factors contained in the documents incorporated by reference therein for a discussion of information that should be considered in connection with an investment in our securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if the Prospectus or this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is March 24, 2026

SEC Form 424B3 filed by Blaize Holdings Inc.