Rosenberg takes 5.74% EWSB Bancorp (EWSB) stake after $10 subscription buy

Rhea-AI Filing Summary

J. David Rosenberg has disclosed a significant stake in EWSB Bancorp, Inc. He reports beneficial ownership of 58,250 shares of common stock, equal to 5.74% of the 1,014,220 shares deemed outstanding.

On June 29, 2026, he purchased 20,750 shares at $10 per share in a subscription offering using personal funds. Rosenberg states the investment is for investment purposes, but he may buy or sell more shares, use Rule 10b5-1 trading plans, pledge shares, and engage management and other shareholders on potential mergers, asset sales, capital structure, dividend policy, or other major corporate changes.

Insights

Equity ownership analyst

Investor reports a new 5.7% stake with potential for active engagement.

J. David Rosenberg now beneficially owns 58,250 shares of EWSB Bancorp, or 5.74% of 1,014,220 shares outstanding. Crossing the 5% threshold requires a Schedule 13D, which signals a sizable, potentially influential position in the company.

Rosenberg funded purchases with personal capital, including 20,750 shares at $10 per share in a subscription offering on June 29, 2026. He has sole voting and dispositive power over all reported shares, consolidating control of this stake.

He indicates flexibility: he may buy more, sell shares, enter or amend Rule 10b5-1 trading plans, pledge shares, or discuss strategic options such as mergers, asset transactions, or capital and dividend changes. The actual impact depends on future actions and any engagement with management or other shareholders.

Key Figures

Beneficial ownership: 58,250 shares Ownership percentage: 5.74% Shares outstanding: 1,014,220 shares +5 more

8 metrics

Beneficial ownership 58,250 shares EWSB Bancorp common stock currently owned by Rosenberg

Ownership percentage 5.74% Portion of 1,014,220 EWSB Bancorp shares deemed outstanding

Shares outstanding 1,014,220 shares EWSB Bancorp common stock deemed outstanding for ownership calculation

Recent purchase size 20,750 shares Shares bought on June 29, 2026 in subscription offering

Purchase price $10 per share Price paid for 20,750 shares in subscription offering

Percent of class (cover) 5.7% Percent of class represented on the cover page

Sole voting power 58,250 shares Shares over which Rosenberg has sole voting authority

Sole dispositive power 58,250 shares Shares over which Rosenberg has sole dispositive authority

Key Terms

Schedule 13D, beneficially owned, Rule 10b5-1 trading plans, subscription offering, +2 more

6 terms

Schedule 13D regulatory

"If the filing person has previously filed a statement on Schedule 13G to report the acquisition..."

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

beneficially owned financial

"11Aggregate amount beneficially owned by each reporting person 58,250.00"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Rule 10b5-1 trading plans regulatory

"whether pursuant to or outside of Rule 10b5-1 trading plans."

Rule 10b5-1 trading plans are written, pre-arranged instructions that allow company insiders (such as executives or directors) to automatically buy or sell their company's stock at specified times or under set conditions, like a standing instruction or automated thermostat for trades. They matter to investors because these plans provide a legal defense against insider‑trading accusations and create predictable insider trading patterns that can help signal whether sales are routine portfolio management or potentially meaningful to the company’s outlook.

subscription offering financial

"On June 29, 2026, the Reporting Person purchased 20,750 shares for a purchase price of $10 per share in a subscription offering."

A subscription offering is a company’s sale of new securities that investors agree to buy in advance, similar to signing up for a magazine subscription where you commit to receive future issues. It matters to investors because it changes how many shares exist and who owns them, and it provides the company with cash for growth, debt repayment or other plans—outcomes that can raise or lower the value of existing holdings.

dispositive power financial

"9 | Sole Dispositive Power 58,250.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

voting power financial

"7 | Sole Voting Power 58,250.00"

Voting power is the ability shareholders have to influence a company's major decisions—like electing the board, approving mergers, or changing corporate rules—based on the voting rights attached to the shares they hold. For investors it matters because greater voting power is like holding more keys to a building: it gives you a stronger say over management choices and the company’s strategy, which can affect future value and risk.

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Available on EDGAR 07/01/2026 - 06:51 PM Accepted by SEC EDGAR 07/01/2026 - 06:50 PM Learn about SEC filing dates

FAQ

What percentage of EWSB Bancorp (EWSB) shares does J. David Rosenberg own?

J. David Rosenberg beneficially owns 58,250 shares of EWSB Bancorp, representing 5.74% of the 1,014,220 common shares deemed outstanding. This crosses the 5% reporting threshold and positions him as a significant shareholder with potential influence on corporate decisions.

How many EWSB Bancorp (EWSB) shares did Rosenberg recently purchase and at what price?

On June 29, 2026, Rosenberg purchased 20,750 shares of EWSB Bancorp common stock at $10 per share in a subscription offering. These shares were bought with personal funds and form part of his total 58,250-share beneficial ownership position.

Why did J. David Rosenberg acquire shares of EWSB Bancorp (EWSB)?

Rosenberg acquired EWSB Bancorp shares for investment purposes. He plans to review the investment continuously, considering the bank’s business, financial condition, stock price, market conditions, and alternative opportunities, which may lead him to buy more shares, hold, or sell part of his position.

Does Rosenberg have control over how his EWSB Bancorp (EWSB) shares are voted and sold?

Yes. Rosenberg has sole voting and dispositive power over all 58,250 EWSB Bancorp shares he beneficially owns. This means he alone decides how these shares are voted and whether, when, and how they might be sold or otherwise transferred.

Could Rosenberg push for strategic changes at EWSB Bancorp (EWSB)?

He indicates he may discuss strategic options with management, directors, and shareholders. These could include mergers, asset sales or acquisitions, changes to capitalization or dividend policy, or other material corporate structure changes, depending on future evaluations and developments.

What trading plans or arrangements might Rosenberg use for his EWSB Bancorp (EWSB) stake?

Rosenberg may establish or amend Rule 10b5-1 trading plans for buying or selling EWSB Bancorp shares, and may also pledge shares under margin, loan, or other security agreements. Such arrangements can systematize trading while he maintains his overall investment review.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

EWSB Bancorp, Inc. /MD/

(Name of Issuer)

Common Stock, $0.01 Par Value

(Title of Class of Securities)

26929P107

(CUSIP Number)

J. David Rosenberg
1 East Fourth Street Suite 1400,
Cincinnati, OH, 45202
(513) 579-6422

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

06/29/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 26929P107

1

Name of reporting person

Rosenberg J. David

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 58,250.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 58,250.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

58,250.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

5.7 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, $0.01 Par Value
(b)	Name of Issuer: EWSB Bancorp, Inc. /MD/
(c)	Address of Issuer's Principal Executive Offices: 109 WEST SECOND STREET, KAUKAUNA, WISCONSIN , 54130.
Item 1 Comment: This statement relates to shares of common stock, $0.01 Par Value (the "Common Stock"), of EWSB Bancorp, Inc. ("Issuer"), whose principal executive office is located at 109 West Second Street, Kaukauna, Wisconsin 54130.
Item 2.	Identity and Background
(a)	J. David Rosenberg
(b)	1 East 4th Street, Suite 1400, Cincinnati, Ohio 45202
(c)	Mr. Rosenberg is a Senior Partner at Keating Muething and Klekamp PLL, 1 East 4th Street, Suite 1400, Cincinnati, Ohio 45202.
(d)	Mr. Rosenberg has not during the last five years, been convicted in any criminal proceeding (excluding traffic violations or similar misdemeanors.)
(e)	Mr. Rosenberg has not during the last five years, been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and has not, as a result of such proceeding, been subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.
(f)	Mr. Rosenberg is a U.S. citizen.
Item 3.	Source and Amount of Funds or Other Consideration
	The shares of the Issuer's Common Stock were purchased with personal funds.
Item 4.	Purpose of Transaction
	The Reporting Person acquired the securities described in this Schedule 13D for investment purposes and he intends to review his investments in the Issuer on a continuing basis. Any actions the Reporting Person might undertake will be dependent upon the Reporting Person's review of numerous factors, including, but not limited to: an ongoing evaluation of the Issuer's business, financial condition, operations and prospects; price levels of the Issuer's securities; general market, industry and economic conditions; the relative attractiveness of alternative business and investment opportunities; and other future developments. The Reporting Person may, at any time and from time to time, acquire additional securities of the Issuer, or retain or sell all or a portion of the securities then held, in the open market or in privately negotiated transactions whether pursuant to or outside of Rule 10b5-1 trading plans. The Reporting Person may in the future enter into and/or amend Rule 10b5-1 trading plans with respect to the acquisition or sale of Issuer securities involving amounts greater than or less than one percent of the Issuer's outstanding common stock. The Reporting Person also may attempt to pledge shares pursuant to margin, loan and other security agreements. In addition, the Reporting Person may engage in discussions with management, Directors, and shareholders of the Issuer and other relevant parties or encourage such persons to consider or explore extraordinary corporate transactions, such as: a merger; sales or acquisitions of assets or businesses; changes to the capitalization or dividend policy of the Issuer; or other material changes to the Issuer's business or corporate structure. Other than as described above, the Reporting Persons does not currently have any plans or proposals that relate to, or would result in, any of the matters listed in Items 4(a)-(j) of Schedule 13D, although, depending on the factors discussed herein, the Reporting Person may change his purpose or formulate different plans or proposals with respect thereto at any time.
Item 5.	Interest in Securities of the Issuer
(a)	As of the date hereof, Mr. Rosenberg owns, in the aggregate, 58,250 shares of the Issuer's Common Stock, representing 5.74% of the 1,014,220 shares of the Common Stock deemed outstanding for such purpose.
(b)	Mr. Rosenberg has sole voting and dispositive power with respect to 58,250 shares of the Issuer's Common Stock.
(c)	On June 29, 2026, the Reporting Person purchased 20,750 shares for a purchase price of $10 per share in a subscription offering.
(d)	None.
(e)	Not applicable.
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	See response to Item 4 above.
Item 7.	Material to be Filed as Exhibits.
	Not applicable.

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.

Rosenberg J. David

Signature:	/s/ J. David Rosenberg
Name/Title:	J. David Rosenberg
Date:	07/01/2026