Spire Global Inc-A美股招股说明书(2026-08-13版)

5,000,000 Shares of Class A Common Stock This prospectus supplement amends and supplements the prospectus dated May 4, 2026 (as supplemented or amended from time to time, the “Prospectus”), which forms apart of our Registration Statement on Form S-1 (No. 333-295274). This prospectus supplement is being filed to update and supplement the information in the Prospectus with the information contained in our Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on August 13, 2026 (the “Quarterly Report”). Accordingly, we have attached the Quarterly Report to this prospectussupplement. This prospectus supplement updates and supplements the information in the Prospectus and is not complete without, and may not be delivered or utilized except incombination with, the Prospectus, including any amendments or supplements thereto. This prospectus supplement should be read in conjunction with the Prospectus and if thereis any inconsistency between the information in the Prospectus and this prospectus supplement, you should rely on the information in this prospectus supplement. Our Class A common stock is traded on the New York Stock Exchange (“NYSE”) under the symbol “SPIR.” On August 11‚ 2026, the last quoted sale price for our ClassA common stock as reported on NYSE was $14.82 per share. Investing in our securities involves a high degree of risk. Before buying any securities, you should carefully read the discussion of the risks of investing in oursecurities in the section titled “Risk Factors” beginning on page 5 of the Prospectus. You should rely only on the information contained in the Prospectus, this prospectus supplement and any other prospectus supplement or amendment hereto.We have not authorized anyone to provide you with different information. NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVEDOF THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS ACRIMINAL OFFENSE. The date of this prospectus is August 13, 2026 (Exact Name of Registrant as Specified in its Charter) Table of Contents FINANCIAL INFORMATION PART I. Item 1. Unaudited Condensed Consolidated Financial StatementsCondensed Consolidated Balance SheetsCondensed Consolidated Statements of OperationsCondensed Consolidated Statements of Comprehensive LossCondensed Consolidated Statements of Changes in Stockholders’ EquityCondensed Consolidated Statements of Cash FlowsNotes to Unaudited Condensed Consolidated Financial StatementsManagement’s Discussion and Analysis of Financial Condition and Results of OperationsQuantitative and Qualitative Disclosures About Market RiskControls and Procedures Item 2.Item 3.Item 4. OTHER INFORMATION PART II. Item 1.Item 1A.Item 2.Item 3.Item 4.Item 5.Item 6.Signatures Legal ProceedingsRisk FactorsUnregistered Sales of Equity Securities and Use of ProceedsDefaults Upon Senior SecuritiesMine Safety DisclosuresOther InformationExhibits SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the federal securities laws, which statements involve substantial risksand uncertainties. Forward-looking statements generally relate to future events or our future financial or operating performance. In some cases, you can identify forward-looking statements because they contain words such as “may,” “will,” “should,” “expect,” “plan,” “anticipate,” “could,” “would,” “intend,” “target,” “project,”“contemplate,” “believe,” “estimate,” “predict,” “potential,” “seek” or “continue” or the negative of these words or other similar terms or expressions that concern ourexpectations, strategy, plans or intentions. Forward-looking statements contained in this Quarterly Report on Form 10-Q include, but are not limited to, statements about: •significant political, trade, regulatory developments, and other circumstances beyond our control, including as a result of geopolitical uncertainty and instabilityand tariffs, which could have a material adverse effect on our financial condition or results of operations;•global and domestic economic conditions, including currency exchange rate fluctuations, inflation, interest rates and their impact on demand and pricing for ourofferings in affected markets;•changes in our growth, strategy, future operations, financial position, estimated revenues and losses, projected costs, prospects, and plans;•our ability to remedy identified material weaknesses;•the ability to develop new offerings, services, solutions and features and bring them to market in a timely manner and make enhancements to our business;•the quality and effectiveness of and advancements in our technology and our ability to accurately and effectively use data and engage in predictive analytics;•overall level of customer demand for our products and services;•expectations and timing related to product