Wealthspring Capital & Matthew Simpson joint filing (NASDAQ: BWIV) shows 5.20% stake

Rhea-AI Filing Summary

Blue Water Acquisition Corp. IV ownership update: Wealthspring Capital LLC and Matthew Simpson report beneficial ownership of 675,757 Class A ordinary shares, representing 5.20% of the class. The filing notes these shares are held as Units, each Unit including one Class A share and one-half of a redeemable warrant.

The report is a joint Schedule 13G filing signed on 04/09/2026 by Matthew Simpson as Manager and Control Person.

Key Figures

Beneficial ownership: 675,757 shares Percent of class: 5.20% Shared voting power: 675,757 +2 more

5 metrics

Beneficial ownership 675,757 shares Amount beneficially owned reported on Schedule 13G

Percent of class 5.20% Percent of Class A ordinary shares reported

Shared voting power 675,757 Shared voting power reported for Wealthspring Capital LLC and Matthew Simpson

Filing execution date 04/09/2026 Date signatures executed on the Schedule 13G and Joint Filing Agreement

Unit composition 1 share + 0.5 warrant per Unit Each Unit consists of one Class A ordinary share and one-half of one redeemable warrant

Key Terms

Units, redeemable warrant, shared voting power, Schedule 13G, +1 more

5 terms

Units financial

"held in the form of Units, where each Unit consists of one Class A ordinary share"

Units are bundled securities sold as one package in a financing—commonly a share paired with an instrument that gives the holder the right to buy more shares later. For investors this matters because a unit’s extra component can change future supply of shares and potential returns, similar to buying a combo with a coupon that can be redeemed later and alter what you actually receive and what others might own.

redeemable warrant financial

"one-half of one redeemable warrant"

A redeemable warrant is a financial tool that gives its holder the right to buy shares of a company at a fixed price within a certain period. If the holder chooses to do so, the company can buy back or cancel the warrant before it expires, often to encourage investment or manage share issuance. For investors, it provides an option to potentially buy shares at a favorable price while offering some flexibility for the issuing company.

shared voting power regulatory

"Shared Voting Power 675,757.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

Schedule 13G regulatory

"the undersigned hereby agree to the joint filing with all other Reporting Persons"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Joint Filing Agreement regulatory

"Exhibit 99.1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)"

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/09/2026 - 04:43 PM Learn about SEC filing dates

FAQ

What stake does Wealthspring Capital report in Blue Water Acquisition Corp. IV (BWIV)?

Wealthspring Capital reports beneficial ownership of 675,757 Class A ordinary shares, equal to 5.20% of the class. The filing states these are held in the form of Units combining one Class A share and one-half of a redeemable warrant.

Who is listed as the reporting person on the Schedule 13G for BWIV?

The Schedule 13G lists Wealthspring Capital LLC and Matthew Simpson as reporting persons. Matthew Simpson signed the joint filing agreement and the Schedule 13G on 04/09/2026 as Manager and Control Person.

How are the reported shares held according to the BWIV filing?

The filing states the 675,757 ordinary shares are held as Units, where each Unit consists of one Class A ordinary share and one-half of one redeemable warrant. The Schedule 13G explicitly ties the holdings to this Unit structure.

What voting and disposition powers are reported for BWIV holdings?

Both Wealthspring Capital LLC and Matthew Simpson report 0 sole voting and dispositive power and 675,757 shared voting and dispositive power. The filing therefore records shared control over the reported shares.

When was the joint filing agreement executed for the BWIV Schedule 13G?

The Exhibit 99.1 Joint Filing Agreement is executed and dated April 9, 2026. The Agreement accompanies the Schedule 13G and binds the reporting persons to a joint filing and responsibility for their respective information.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Blue Water Acquisition Corp. IV

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G1368A120

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G1368A120

1

Names of Reporting Persons

Wealthspring Capital LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

NEW YORK

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 675,757.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 675,757.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

675,757.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.2 %

12

Type of Reporting Person (See Instructions)

IA, PN

Comment for Type of Reporting Person: The holdings figures reported throughout this Schedule 13G consist of 675,757 ordinary shares held in the form of Units, where each Unit, each consisting of one Class A ordinary share and one-half of one redeemable warrant.

SCHEDULE 13G

CUSIP Number(s): G1368A120

1

Names of Reporting Persons

Matthew Simpson

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 675,757.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 675,757.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

675,757.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.2 %

12

Type of Reporting Person (See Instructions)

HC, IA, IN

Comment for Type of Reporting Person: The holdings figures reported throughout this Schedule 13G consist of 675,757 ordinary shares held in the form of Units, where each Unit, each consisting of one Class A ordinary share and one-half of one redeemable warrant.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Blue Water Acquisition Corp. IV
(b)	Address of issuer's principal executive offices: 15 E. Putnam Avenue Suite 363, Greenwich, Connecticut 06830
Item 2.
(a)	Name of person filing: Wealthspring Capital LLC Matthew Simpson
(b)	Address or principal business office or, if none, residence: 2 WESTCHESTER PARK DRIVE SUITE 108 WEST HARRISON, New York 10604
(c)	Citizenship: Wealthspring Capital LLC - NEW YORK Matthew Simpson - UNITED STATES
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP Number(s): G1368A120
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 675,757
(b)	Percent of class: 5.20 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Wealthspring Capital LLC - 0 Matthew Simpson - 0
	(ii) Shared power to vote or to direct the vote: Wealthspring Capital LLC - 675,757 Matthew Simpson - 675,757
	(iii) Sole power to dispose or to direct the disposition of: Wealthspring Capital LLC - 0 Matthew Simpson - 0
	(iv) Shared power to dispose or to direct the disposition of: Wealthspring Capital LLC - 675,757 Matthew Simpson - 675,757
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Wealthspring Capital LLC

Signature:	Matthew Simpson
Name/Title:	Manager
Date:	04/09/2026

Matthew Simpson

Signature:	Matthew Simpson
Name/Title:	Control Person
Date:	04/09/2026

Exhibit Information

Exhibit 99.1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with all other Reporting Persons (as such term is defined in the Schedule 13G referred to below) on behalf of each of them a statement on Schedule 13G (including amendments thereto, if any) with respect to the ordinary shares of Blue Water Acquisition Corp. IV., and that this Agreement may be included as an Exhibit to such joint filing. Each of the undersigned agrees to be responsible for the timely filing of the Schedule 13G and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate. IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of April 9, 2026. Wealthspring Capital LLC /s/ Matthew Simpson Name: Matthew Simpson Title: Manager /s/ Matthew Simpson Name: Matthew Simpson