UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 26, 2026

SIDUS SPACE, INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (321) 613-5620

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instructions A.2. below):

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 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§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 for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

On February 26, 2026, Sidus Space, Inc. (the “Company”) entered into an ATM sales agreement (the “Sales Agreement”) with ThinkEquity LLC (the “Sales Agent”), pursuant to which the Company may offer and sell, from time to time (the “Offering”) through the Sales Agent, shares (the “Shares”) of the Company’s Class A common stock, par value $0.0001 per share (the “Common Stock”), up to a maximum amount as set forth in the Sales Agreement, subject to the terms and conditions of the Sales Agreement.

Under the Sales Agreement, the Sales Agent may sell the Shares in sales deemed to be an “at-the-market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended (the “Securities Act”), including sales made directly on or through The Nasdaq Capital Market or any other existing trading market for the Common Stock, in negotiated transactions at market prices prevailing at the time of sale or at prices related to such prevailing market prices, and/or any other method permitted by law. The Company may instruct the Sales Agent not to sell the Shares if the sales cannot be effected at or above the price designated by the Company from time to time. The Company is not obligated to make any sales of the S

The Company is not obligated to make any sales of the Shares under the Sales Agreement. The offering pursuant to the Sales Agreement will terminate upon the termination of the Sales Agreement as permitted therein. The Company may terminate the Sales Agreement in its sole discretion at any time by giving ten days’ prior notice to the Sales Agent. The Sales Agent may terminate the Sales Agreement under the circumstances specified in the Sales Agreement and in its sole discretion at any time by giving ten days’ prior notice to the Company.

The Company will pay the Sales Agent a fixed commission rate of 3.0% of the aggregate gross proceeds of the sales price of the Shares sold through the Sales Agent pursuant to the Sales Agreement and has agreed to provide the Sales Agent with customary indemnification and contribution rights. The Sales Agreement contains customary representations and warranties and conditions to the sale of the Shares pursuant thereto. The Company also agreed to reimburse the Sales Agent for certain expenses.

The Shares are being offered and sold pursuant to the Company’s shelf registration statement on Form S-3 and an accompanying prospectus (File No. 333-292839) filed by the Company with the U.S. Securities and Exchange Commission (“SEC”) on January 20, 2026 and declared effective by the SEC on February 4, 2026 (the “Registration Statement”) and pursuant to a prospectus supplement dated February 25, 2026.

The foregoing description of the Sales Agreement is not complete and is qualified in its entirety by reference to the full text of such agreement, a copy of which is filed herewith as Exhibit 10.1 and is incorporated herein by reference. The opinion of Sheppard, Mullin, Richter & Hampton LLP, the Company’s counsel, regarding the legality of the Shares that may be issued pursuant to the Sales Agreement is also filed herewith as Exhibit 5.1.

This Current Report on Form 8-K shall not constitute an offer to sell or the solicitation of an offer to buy the Shares discussed herein, nor shall there be any offer, solicitation, or sale of the Shares in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.