Sidus Space, Inc. (the Company) entered into an At-The-Market (ATM) sales agreement with ThinkEquity LLC (the Sales Agent) on February 26, 2026. The agreement allows the Company to offer and sell, from time to time, up to $100,000,000 of its Class A common stock, par value $0.0001 per share, through the Sales Agent. Sales will be conducted as at-the-market offerings, including directly on or through The Nasdaq Capital Market, in negotiated transactions at prevailing market prices, or by any other legally permitted method. The Company is not obligated to make any sales of shares under the agreement, and the Sales Agent is not obligated to purchase shares on a principal basis. Sidus Space will pay the Sales Agent a fixed commission rate of 3.0% of the aggregate gross proceeds from the sales price of shares sold. The offering is being made pursuant to the Company's shelf registration statement on Form S-3 (File No. 333-292839), which was declared effective by the SEC on February 4, 2026, and an accompanying prospectus supplement dated February 25, 2026.