Private Units Subscription Agreement dated November 14, 2024, between the Company and the Sponsor

EXHIBIT 10.1

PRIVATE UNIT SUBSCRIPTION AGREEMENT

BETWEEN THE REGISTRANT AND THE SPONSOR

Horizon Space Acquisition II Corp.

1412 Broadway

21st Floor, Suite 21V

New York, NY 10018

November 14, 2024

Ladies and Gentlemen:

Horizon Space Acquisition II Corp. (the “Company”), a blank check company formed for the purpose of acquiring one or more businesses or entities (a “Business Combination”), intends to register its securities under the Securities Act of 1933, as amended (“Securities Act”), in connection with its initial public offering (“IPO”), pursuant to a registration statement on Form S-1 (File No. 333- 282758) (“Registration Statement”).

The undersigned hereby commits that it will purchase 200,000 units (or up to 213,500 units if the overallotment option is exercised in full by Maxim Group LLC, the representative of underwriters of the IPO) of the Company (“Private Units”), each Private Unit consisting of one ordinary share of the Company, par value $0.0001 per share (the “Ordinary Share”), and one right to receive one-tenth (1/10) of one Ordinary Share (each a “Right”), at $10.00 per Private Unit, for a purchase price of $2,000,000 (or up to $2,135,000 if the over-allotment option is exercised in full by Maxim Group LLC) (the “Private Unit Purchase Price”).

At least twenty-four (24) hours prior to the effective date of the Registration Statement, the undersigned will cause the Private Unit Purchase Price to be delivered to the Company by wire transfer as set forth in the instructions attached as Exhibit A to hold in a non-interest bearing account until the Company consummates the IPO.

The consummation of the purchase and issuance of the Private Units shall occur simultaneously with the consummation of the IPO. Simultaneously with the consummation of the IPO, the Company shall deposit the Private Unit Purchase Price, without interest or deduction, into the trust fund (“Trust Fund”) established by the Company for the benefit of the Company’s public shareholders as described in the Registration Statement. If the Company does not complete the IPO within ten (10) days from the date of this letter, the Private Unit Purchase Price (without interest or deduction) will be returned to the undersigned.

The Private Units will be identical to the units to be sold by the Company in the IPO. Additionally, the undersigned agrees:

Further, the undersigned agrees that its Private Units, and any underlying securities are not transferable or salable until the completion of the Company’s initial Business Combination, except for transfer (i) among the founders or to the Company’s founders’ members, officers, directors, consultants or their affiliates, (ii) to a holder’s shareholders or members upon the holder’s liquidation, in each case if the holder is an entity, (iii) by bona fide gift to a member of the holder’s immediate family or to a trust, the beneficiary of which is the holder or a member of the holder’s immediate family, in each case for estate planning purposes, (iv) by virtue of the laws of descent and distribution upon death, (v) pursuant to a qualified domestic relations order, (vi) to the Company for no value for cancellation in connection with the consummation of a Business Combination, (vii) in connection with the consummation of a Business Combination at prices no greater than the price at which the securities were originally purchased, (viii) in the event of the Company’s liquidation prior to its consummation of an initial Business Combination or (ix) in the event that, subsequent to the consummation of an initial Business Combination, the Company completes a liquidation, merger, capital share exchange or other similar transaction which results in all of the Company’s shareholders having the right to exchange their ordinary shares for cash, securities or other property, in each case (except for clauses (vi), (viii) or (ix) or with the Company’s prior written consent) on the condition that prior to such registration for transfer, the security agent shall be presented with written documentation pursuant to which each transferee or the trustee or legal guardian for such permitted transferee agrees to be bound by the transfer restrictions contained in any applicable agreement the transferor is bound by.

The undersigned acknowledges and agrees that the purchaser of the Private Units will execute agreements in form and substance typical for transactions of this nature necessary to effectuate the foregoing agreements and obligations prior to the consummation of the IPO as are reasonably acceptable to the undersigned, including but not limited to an insider letter.

The undersigned hereby represents and warrants that:

The Company represents and warrants that neither the Company nor, to its knowledge, any of its affiliates, members, officers, directors or beneficial shareholders of 20% or more of its outstanding securities, has experienced a disqualifying event as enumerated pursuant to Rule 506(d) of Regulation D under the Securities Act.

This letter agreement constitutes the entire agreement between the undersigned and the Company with respect to the purchase of the Private Units, and supersedes all prior and contemporaneous understandings, agreements, representations and warranties, both written and oral, with respect to the same.

This Agreement, the entire relationship of the parties hereto, and any litigation between the parties (whether grounded in contract, tort, statute, law or equity) shall be governed by, construed in accordance with, and interpreted pursuant to the laws of the State of New York, without giving effect to its choice of laws principles. The parties hereby irrevocably and unconditionally (i) submit to the jurisdiction of the state courts of New York and the United States District Court for the Southern District of New York for the purpose of any suit, action or other proceeding arising out of or based upon this Agreement, (ii) agree not to commence any suit, action or other proceeding arising out of or based upon this Agreement except in state courts of New York or the United States District Court for the Southern District of New York, and (iii) waive, and agree not to assert, by way of motion, as a defense, or otherwise, in any such suit, action or proceeding, any claim that it is not subject personally to the jurisdiction of the above-named courts, that its property is exempt or immune from attachment or execution, that the suit, action or proceeding is brought in an inconvenient forum, that the venue of the suit, action or proceeding is improper or that this Agreement or the subject matter hereof may not be enforced in or by such court. THE PARTIES HERETO HEREBY WAIVE ANY RIGHT TO A JURY TRIAL IN CONNECTION WITH ANY LITIGATION PURSUANT TO THIS AGREEMENT AND THE TRANSACTIONS CONTEMPLATED HEREBY.

All of the terms, agreements, covenants, representations, warranties, and conditions of this Agreement are binding upon, and inure to the benefit of and are enforceable by, the parties hereto and their respective successors. Nothing in this Agreement, express or implied, is intended to confer upon any party other than the parties hereto or their respective successors and assigns any rights, remedies, obligations or liabilities under or by reason of this Agreement, except as expressly provided in this Agreement. Except as otherwise specifically provided herein, no party hereto may assign either this Agreement or any of its rights, interests, or obligations hereunder without the prior written approval of the other party.

[signature page follows]

[signature page to private units subscription agreement – Horizon Space Acquisition II Corp.]

Exhibit A

Wire Instructions

Bank Name:

Bank Address:

Account Name:

Account Number:

Routing/ABA Number (Domestic Wires):

Swift Code (Foreign Wire):

Note: