0001829126-25-003009 Sample Contracts

COMPANY SHAREHOLDER SUPPORT AGREEMENT
Company Shareholder Support Agreement • April 29th, 2025 • Black Hawk Acquisition Corp • Blank checks

This COMPANY SHAREHOLDER SUPPORT AGREEMENT (this “Agreement”), dated as of April 26, 2025, is made by and among Black Hawk Acquisition Corporation, a Cayman Islands exempted company (which shall de-register in the Cayman Islands and transfer by way of continuation out of the Cayman Islands and into the State of Delaware so as to migrate to and domesticate as a Delaware corporation on the day that is one Business Day prior to the Closing Date (as defined below)) (prior to the Domestication Effective Time, “Parent”, and at and after the Domestication Effective Time, “PubCo”), Vesicor Therapeutics, Inc., a California corporation (the “Company”) and the undersigned stockholder of the Company set forth on Schedule I (the “Stockholder”). Parent, Company and Stockholder shall be referred to herein from time to time collectively as the “Parties.” Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to such terms in the Business Combination Agreement (as defi

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FORM OF LOCK-UP AGREEMENT
Lock-Up Agreement • April 29th, 2025 • Black Hawk Acquisition Corp • Blank checks • Delaware

This FORM OF LOCK-UP AGREEMENT (this “Agreement”) is dated as of [●], 2025, by and among the shareholder(s) set forth on the signature page to this Agreement (individually, the “Holder” or “Warrant Holder,” collectively, the “Holders”) and Black Hawk Acquisition Corporation, a Cayman Islands exempted company (which shall de-register in the Cayman Islands and transfer by way of continuation out of the Cayman Islands and into the State of Delaware so as to migrate to and domesticate as a Delaware corporation on the day that is one Business Day prior to the Closing Date (as defined below)) (prior to the Domestication Effective Time, “Parent”, and at and after the Domestication Effective Time, “PubCo”). Capitalized terms used and not otherwise defined herein shall have the meanings given such terms in the Business Combination Agreement (as defined below). Parent, PubCo, the Holders may also be referred to individually as a “party” and collectively as the “parties”.

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BUSINESS COMBINATION AGREEMENT dated April 26, 2025 by and among Vesicor Therapeutics, Inc., Black Hawk Acquisition Corp., and BH Merger Sub, Inc.
Business Combination Agreement • April 29th, 2025 • Black Hawk Acquisition Corp • Blank checks • Delaware

This BUSINESS COMBINATION AGREEMENT, dated as of April 26, 2025 (this “Agreement”), is entered into by and among Vesicor Therapeutics, Inc., a California corporation (which shall reincorporate into the State of Delaware so as to migrate to and domesticate as a Delaware corporation on the day that is one (1) Business Day prior to the Closing Date (as defined below) (the “Company”), Black Hawk Acquisition Corporation, a Cayman Islands exempted company (which shall de-register in the Cayman Islands and transfer by way of continuation out of the Cayman Islands and into the State of Delaware so as to migrate to and domesticate as a Delaware corporation on the day that is one Business Day prior to the Closing Date (as defined below)) (prior to the Domestication Effective Time, “Parent”, and at and after the Domestication Effective Time, “PubCo”), and BH Merger Sub, Inc., a Delaware corporation and wholly-owned subsidiary of Parent (“Merger Sub”). Company, Parent, and Merger Sub may also be r

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FORM OF AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT
Registration Rights Agreement • April 29th, 2025 • Black Hawk Acquisition Corp • Blank checks • Delaware

THIS FORM OF AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of [●], is made and entered into by and among [●], a Delaware corporation (the “Company”) (formerly known as Black Hawk Acquisition Corporation, a Cayman Islands exempted company, prior to its domestication as a Delaware corporation) and each of the undersigned parties that are Pre-IPO Investors (as defined below), and any person or entity who hereafter becomes a party to this Agreement pursuant to Section 5.2 of this Agreement (together with the Pre-IPO Investors, the “Existing Holders”), and the undersigned parties listed as New Holders on the signature pages hereto (each such party, together with any person or entity deemed a “New Holder” who hereafter becomes a party to this Agreement pursuant to Section 5.2 of this Agreement, a “New Holder” and collectively, the “New Holders”). Existing Holders, collectively with New Holders, are referred to herein as “Holders.”

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