Dynamix Corp IV Sample Contracts

UNDERWRITING AGREEMENT
Underwriting Agreement • February 17th, 2026 • Dynamix Corp IV • Blank checks • New York

The undersigned, Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), hereby confirms its agreement with Cohen & Company Capital Markets, a division of Cohen & Company Securities, LLC (the “Representative”) and with the other underwriters named on Schedule A hereto (if any), for which the Representative is acting as representative (the Representative and such other underwriters being collectively referred to herein as the “Underwriters” or, each underwriter individually, an “Underwriter,” provided that, if only the Representative is listed on such Schedule A, any references to Underwriters shall refer exclusively to the Representative) as follows:

UNDERWRITING AGREEMENT
Underwriting Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks • New York

The undersigned, Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), hereby confirms its agreement with Cohen & Company Capital Markets, a division of Cohen & Company Securities, LLC (the “Representative”) and with the other underwriters named on Schedule A hereto (if any), for which the Representative is acting as representative (the Representative and such other underwriters being collectively referred to herein as the “Underwriters” or, each underwriter individually, an “Underwriter,” provided that, if only the Representative is listed on such Schedule A, any references to Underwriters shall refer exclusively to the Representative) as follows:

WARRANT AGREEMENT
Warrant Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks • New York

THIS WARRANT AGREEMENT (this “Agreement”), dated as of is by and between Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), and Odyssey Transfer and Trust Company, a Minnesota corporation, as warrant agent (in such capacity, the “Warrant Agent,” and also referred to herein as the “Transfer Agent”).

INVESTMENT MANAGEMENT TRUST AGREEMENT
Investment Management Trust Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks

This Investment Management Trust Agreement (this “Agreement”) is made effective as of , by and between Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), and Odyssey Transfer and Trust Company (the “Trustee”).

REGISTRATION RIGHTS AGREEMENT
Registration Rights Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks • New York

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of ___________, is made and entered into by and among Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), DynamixCore Holdings IV, LLC, a Delaware limited liability company (the “Sponsor”), Cohen & Company Capital Markets, a division of Cohen & Company Securities, LLC, and (the “Subscribers”), and each of the undersigned parties listed on the signature page hereto under “Holders” (each such party, together with the Sponsor and the Subscribers 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”).

FORM OF INDEMNITY AGREEMENT
Indemnity Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks • New York

THIS INDEMNITY AGREEMENT (this “Agreement”) is made as of , by and between Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), and the undersigned (“Indemnitee”).

Dynamix Corporation IV
Administrative Services Agreement • February 17th, 2026 • Dynamix Corp IV • Blank checks

This letter agreement by and between Dynamix Corporation IV (the “Company”) and Volta Tread LLC (the “Services Provider”), an affiliate of our sponsor, DynamixCore Holdings IV, LLC (“Sponsor”), dated as of the date hereof, will confirm our agreement that, commencing on the date the securities of the Company are first listed on The New York Stock Exchange (the “Listing Date”), pursuant to a Registration Statement on Form S-1 and prospectus filed with the U.S. Securities and Exchange Commission (the “Registration Statement”) and continuing until the earlier of the consummation by the Company of an initial business combination and the Company’s liquidation (in each case as described in the Registration Statement) (such earlier date hereinafter referred to as the “Termination Date”):

ADVISORY SERVICES AGREEMENT
Advisory Services Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks • New York

THIS ADVISORY SERVICES AGREEMENT (the “Agreement”), is made and entered into as of , by and between Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), and Volta Tread LLC, a Texas limited liability company (“Volta”). Capitalized terms used herein but not otherwise defined have the meaning set forth in Section 1.

Dynamix Corporation IV
Administrative Services Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks

This letter agreement by and between Dynamix Corporation IV (the “Company”) and Volta Tread LLC (the “Services Provider”), an affiliate of our sponsor, DynamixCore Holdings IV, LLC (“Sponsor”), dated as of the date hereof, will confirm our agreement that, commencing on the date the securities of the Company are first listed on the Nasdaq Global Market (the “Listing Date”), pursuant to a Registration Statement on Form S-1 and prospectus filed with the U.S. Securities and Exchange Commission (the “Registration Statement”) and continuing until the earlier of the consummation by the Company of an initial business combination and the Company’s liquidation (in each case as described in the Registration Statement) (such earlier date hereinafter referred to as the “Termination Date”):

Dynamix Corporation IV PO Box 309, Ugland House
Securities Subscription Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks • New York

Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), is pleased to accept the offer DynamixCore Holdings IV, LLC, a Delaware limited liability company (the “Subscriber” or “you”), has made to subscribe for 6,708,333 Class B ordinary shares of the Company (the “Shares”), $0.0001 par value per share (the “Class B Ordinary Shares”), up to 875,000 of which are subject to complete or partial forfeiture by you if the underwriters of the Company’s initial public offering (“IPO”) of units do not fully exercise their over-allotment option (the “Over-allotment Option”). For the purposes of this Agreement, references to “Ordinary Shares” are to, collectively, the Class B Ordinary Shares and the Company’s Class A ordinary shares, $0.0001 par value per share (the “Class A Ordinary Shares”). Pursuant to the Company’s memorandum and articles of association, as amended to the date hereof (the “Articles”), Class B Ordinary Shares will convert into Class A Ordinary Shares on a one-

PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT
Private Placement Warrants Purchase Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks • New York

This PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT (this “Agreement”) is made as of the day of , by and between Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), and Cohen & Company Capital Markets, a division of Cohen & Company Securities, LLC, and (collectively, the “Subscriber”).

Insert Date] Dynamix Corporation IV 1980 Post Oak Blvd., Suite 100 PMB 6373 Houston, TX 77056
Underwriting Agreement • February 17th, 2026 • Dynamix Corp IV • Blank checks

This letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and between Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), and Cohen & Company Capital Markets, a division of Cohen & Company Securities, LLC as the representative (the “Representative”) of the underwriters (the “Underwriters”), relating to an underwritten initial public offering (the “Public Offering”) of up to 20,125,000 of the Company’s units (including up to 2,625,000 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-third of 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 share, subject to adjustment. The Units shall be sold in the

PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT
Private Placement Warrants Purchase Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks • New York

THIS PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT, dated as of , (as it may from time to time be amended, this “Agreement”), is entered into by and between Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), and DynamixCore Holdings IV, LLC, a Delaware limited liability company (the “Purchaser”).

Insert Date] Dynamix Corporation IV 1980 Post Oak Blvd., Suite 100 PMB 6373 Houston, TX 77056
Underwriting Agreement • December 3rd, 2025 • Dynamix Corp IV • Blank checks

This letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and between Dynamix Corporation IV, a Cayman Islands exempted company (the “Company”), and Cohen & Company Capital Markets, a division of Cohen & Company Securities, LLC as the representative (the “Representative”) of the underwriters (the “Underwriters”), relating to an underwritten initial public offering (the “Public Offering”) of up to 20,125,000 of the Company’s units (including up to 2,625,000 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-third of 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 share, subject to adjustment. The Units shall be sold in the