Blue Water Acquisition Corp. IV Sample Contracts

PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT
Private Placement Units Purchase Agreement • December 5th, 2025 • Blue Water Acquisition Corp. IV • New York

THIS PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT, dated as of [___], 2025 (as it may from time to time be amended, this “Agreement”), is entered into by and between Blue Water Acquisition Corp. IV, a Cayman Islands exempted company (the “Company”), and Blue Water Acquisition IV LLC, a Delaware limited liability company (the “Purchaser”).

INVESTMENT MANAGEMENT TRUST AGREEMENT
Investment Management Trust Agreement • December 5th, 2025 • Blue Water Acquisition Corp. IV

This Investment Management Trust Agreement (this “Agreement”) is made effective as of [___], 2025 by and between Blue Water Acquisition Corp. IV, a Cayman Islands exempted company (the “Company”), and Continental Stock Transfer & Trust Company, a New York corporation (the “Trustee”).

REGISTRATION RIGHTS AGREEMENT
Registration Rights Agreement • December 5th, 2025 • Blue Water Acquisition Corp. IV • New York

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of [___], 2025, is made and entered into by and among Blue Water Acquisition Corp. IV, a Cayman Islands exempted company (the “Company”), Blue Water Acquisition IV LLC, a Delaware limited liability company (the “Sponsor”), BTIG, LLC (the “Representative”) (each party, together with the Sponsor, the Representative 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”).

PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT
Private Placement Units Purchase Agreement • December 5th, 2025 • Blue Water Acquisition Corp. IV • New York

This PRIVATE PLACEMENT UNITS PURCHASE AGREEMENT (this “Agreement”) is made as of the [__] day of [__], 2025, by and between Blue Water Acquisition Corp. IV, a Cayman Islands exempted company (the “Company”) and BTIG, LLC (“BTIG” or the “Subscriber”).

Blue Water Acquisition Corp. IV Suite 363 Greenwich, CT 06830
Securities Subscription Agreement • December 5th, 2025 • Blue Water Acquisition Corp. IV • New York

This agreement (the “Agreement”) is between Blue Water Acquisition IV LLC, a Delaware limited liability company (the “Subscriber” or “you”), and Blue Water Acquisition Corp. IV, a Cayman Islands exempted company (the “Company,” “we” or “us”). Pursuant to the terms hereof, the Company hereby accepts the offer the Subscriber has made to subscribe for and purchase 4,791,667 Class B Ordinary Shares, $0.0001 par value per share of the Company (the “Shares”), up to 625,000 of which are subject to surrender and cancellation by you if the underwriters of the initial public offering (“IPO”) of units (“Units”) of the Company, do not fully exercise their over-allotment option (the “Over-allotment Option”). The Company and the Subscriber’s agreements regarding such Shares are as follows:

Blue Water Acquisition Corp. IV
Administrative Services Agreement • December 5th, 2025 • Blue Water Acquisition Corp. IV

This letter agreement by and between Blue Water Acquisition Corp. IV (the “Company”) and Blue Water Acquisition IV LLC, our sponsor, (the “Services Provider” or “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”):

Blue Water Acquisition Corp. IV Greenwich, CT 06830
Underwriting Agreement • December 5th, 2025 • Blue Water Acquisition Corp. IV

This letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and among Blue Water Acquisition Corp. IV, a Cayman Islands exempted company (the “Company”) and BTIG, LLC as representative (the “Representative”) of the underwriters (the “Underwriters”), relating to an underwritten initial public offering (the “Public Offering”), of up to 14,375,000 of the Company’s units (including up to 1,875,000 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-half 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 Public Offering pursuant to the registration statement on Form S-1

INDEMNITY AGREEMENT
Indemnity Agreement • December 5th, 2025 • Blue Water Acquisition Corp. IV • New York

THIS INDEMNITY AGREEMENT (this “Agreement”) is made as of [___], 2025, by and between Blue Water Acquisition Corp. IV, a Cayman Islands exempted company (the “Company”), and the undersigned (“Indemnitee”).

WARRANT AGREEMENT
Warrant Agreement • December 5th, 2025 • Blue Water Acquisition Corp. IV • New York

THIS WARRANT AGREEMENT (this “Agreement”), dated as of [___], 2025, is by and between Blue Water Acquisition Corp. IV, a Cayman Islands exempted company (the “Company”), and Continental Stock Transfer & Trust Company, a New York corporation, as warrant agent (in such capacity, the “Warrant Agent,” and also referred to herein as the “Transfer Agent”).