IAMBIC THERAPEUTICS, INC.

2026 EQUITY INCENTIVE PLAN

1. Purposes of the Plan; Award Types.

(a) Purposes of the Plan. The purposes of this Plan areto attract and retain personnel for positions with the Company Group, to provide additional incentive to Employees, Directors, and Consultants (collectively, “Service Providers”), and to promote the success of the Company’s business.

(b) Award Types. The Plan permits the grant of Incentive Stock Options to any ISO Employee and the grant of Nonstatutory Stock Options, Stock Appreciation Rights, Restricted Stock, Restricted Stock Units, Performance Awards, and Other Stock Awards to any Service Provider.

2. Definitions. The following definitions are used in this Plan:

(a) “Administrator” means Administrator as defined in Section 4(a).

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**PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT **

THIS PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT, effective as of [●], 2026 (as it may from time to time be amended, this “Agreement”), is entered into by and between Harbour Island Acquisition Corp. I, a Cayman Islands exempted company (the “Company”), and Harbour Island Acquisition Sponsor LLC, a Delaware limited liability company (the “Purchaser”).

WHEREAS

The Company intends to consummate an initial public offering of the Company’s units (the “IPO”), each unit consisting of one Class A Ordinary Share, par value $0.0001 per share, of the Company (each, a “Class A Ordinary Share”), and one redeemable warrant (a “Warrant”) to purchase a Class A Ordinary Share (a “Warrant Share”) to be governed by the Warrant Agreement to be entered into between the Company and Continental Stock Transfer & Trust Company, as warrant agent (the “Warrant Agreement”), as set forth in the Company’s registration statement on Form S-1, filed with the Securities and Exchange Commission (the “SEC”), File Number 333

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INVESTMENT MANAGEMENT TRUST AGREEMENT

This Investment Management Trust Agreement (this “Agreement”) is made effective as of [●], 2026 by and between Harbour Island Acquisition Corp. I, a Cayman Islands exempted company (the “Company”), and Continental Stock Transfer & Trust Company, a New York limited liability trust company (the “Trustee”).

WHEREAS, the Company’s registration statement on Form S-1 (File No. 333-[•]) (the “Registration Statement”) and prospectus (the “Prospectus”) for the initial public offering of the Company’s units (the “Units”), each of which consists of one of the Company’s Class A ordinary shares, par value $0.0001 per share (the “Ordinary Shares”), and one redeemable warrant, each whole warrant entitling the holder thereof to purchase one Ordinary Share (such initial public offering hereinafter referred to as the “Offering”), has been declared effective as of the date hereof by the U.S. Securities and Exchange Commission;

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[●], 2026

Harbour Island Acquisition Corp. I

2875 South Ocean Boulevard

Palm Beach, FL 33480

Re: Initial Public Offering

Ladies and Gentlemen:

This letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and among Harbour Island Acquisition Corp. I, a Cayman Islands exempted company (the “Company”) and Clear Street LLC, as representative (the “Representative”) of the underwriters (the “Underwriters”), relating to an underwritten initial public offering (the “Public Offering”), of up to 11,500,000 of the Company’s units (including up to 1,500,000 units which may be purchased to cover over-allotments, if any) (the “Units”), each comprised of one Class A ordinary share, par value $0.0001 per share, of the Company (the “Class A Ordinary Shares”) and one redeemable warrant (each whole warrant, a “Warrant”). Each Warrant entitles the holder thereof to purchase one Class A Ordinary Share at a price of $11.50 per whole share, subject t

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REGISTRATION RIGHTS AGREEMENT

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of [●], 2026 is made and entered into by and among Harbour Island Acquisition Corp. I, a Cayman Islands exempted company (the “Company”), Harbour Island Acquisition Sponsor LLC, a Delaware limited liability company (the “Sponsor”), Clear Street LLC, as the representative of the underwriters (the “Representative”), and the undersigned parties listed under Holder on the signature pages hereto (each such party, and any person or entity who hereafter becomes a party to this Agreement pursuant to Section 5.2 of this Agreement, a “Holder” and collectively the “Holders”).

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RECITALS

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INDEMNITY AGREEMENT

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THIS INDEMNITY AGREEMENT (this “Agreement”) is made as of [●], 2026, by and between Harbour Island Acquisition Corp. I, a Cayman Islands exempted company (the “Company”), and the undersigned (“Indemnitee”).

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RECITALS

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WHEREAS, highly competent persons have become more reluctant to serve publicly-held companies as directors, officers or in other capacities unless they are provided with adequate protection through insurance or adequate indemnification against inordinate risks of claims and actions against them arising out of their service to and activities on behalf of such companies;

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WHEREAS, the Board of Directors of the Company (the “Board”) has determined that, in order to attract and retain qualified individuals, the Company will attempt to maintain on an ongoing basis, at its sole expense, liability insurance to protect persons serving the Company and its Subsidiaries (as defined below) from certain liabilities;

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PRIVATE WARRANTS PURCHASE AGREEMENT

THIS PRIVATE WARRANTS PURCHASE AGREEMENT, dated as of [__], 2026 (as it may from time to time be amended, this “Agreement”), is entered into between Allarity Acquisition Corp., a Cayman Islands exempted company (the “Company”), and ALLR Sponsor LLC, a Delaware limited liability company (the “Purchaser”).

WHEREAS, the Company intends to consummate an initial public offering (the “Public Offering”) of the Company’s units, each unit consisting of one Class A ordinary share, par value $0.0001 per share, of the Company (each, a “Class A Ordinary Share”), and one redeemable warrant, each whole warrant entitling the holder thereof to purchase one Class A Ordinary Share at an exercise price of $11.50 per Class A Ordinary Share, as set forth in the Company’s Registration Statement on Form S-1 (File No. 333-298851) (the “Registration Statement”), filed with the U.S. Securities and Exchange Commission (the “SEC”) under the Securities Act of 1933, as amended (the “Securities Act”)

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