# EDGAR Filing Document

**Accession Number:** 0001346609
**File Stem:** 0001213900-26-056748
**Filing Date:** 2026-5
**Character Count:** 23250
**Document Hash:** 93ac5eb09a4a71b714159f4e6271b09f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-26-056748.hdr.sgml**: 20260514

**ACCESSION NUMBER**: 0001213900-26-056748

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260514

**DATE AS OF CHANGE**: 20260514

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Coincheck Group N.V.
- **CENTRAL INDEX KEY:** 0001913847
- **STANDARD INDUSTRIAL CLASSIFICATION:** FINANCE SERVICES [6199]
- **ORGANIZATION NAME:** 09 Crypto Assets
- **EIN:** 000000000
- **STATE OF INCORPORATION:** P7
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-94856
- **FILM NUMBER:** 26979988

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** NIEUWEZIJDS VOORBURGWAL 162
- **CITY:** 1012 SJ AMSTERDAM
- **PROVINCE COUNTRY:** P7
- **BUSINESS PHONE:** 31-20-522-2555

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** NIEUWEZIJDS VOORBURGWAL 162
- **CITY:** 1012 SJ AMSTERDAM
- **PROVINCE COUNTRY:** P7

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Coincheck Group B.V.
- **DATE OF NAME CHANGE:** 20220228
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MONEX GROUP, INC.
- **CENTRAL INDEX KEY:** 0001346609
- **STANDARD INDUSTRIAL CLASSIFICATION:** UNKNOWN SIC - 8880 [8880]
- **ORGANIZATION NAME:** International Corp Fin
- **EIN:** 000000000

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** PACIFIC CENTURY PLACE MARUNOUCHI 19F
- **STREET 2:** 1-11-1 MARUNOUCHI, CHIYODA-KU
- **CITY:** TOKYO 100-6219
- **STATE:** M0
- **ZIP:** 00000
- **BUSINESS PHONE:** 212-455-2344

**MAIL ADDRESS:**
- **STREET 1:** PACIFIC CENTURY PLACE MARUNOUCHI 19F
- **STREET 2:** 1-11-1 MARUNOUCHI, CHIYODA-KU
- **CITY:** TOKYO 100-6219
- **STATE:** M0
- **ZIP:** 00000

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MONEX BEANS HOLDINGS INC
- **DATE OF NAME CHANGE:** 20051212

## Exhibit 99.4

**Exhibit 99.4**

**Execution Version**

**COINCHECK GROUP N.V.** 

**ACKNOWLEDGEMENT AGREEMENT**

*May 12, 2026*

 

**TABLE OF CONTENTS**

---

| | | | |
|:---|:---|:---|:---|
|  |  |  | ***Page*** |
| **1** | **GENERAL** | **GENERAL** | **1** |
|  | 1.1 | Certain Definitions | 1 |
|  | 1.2 | Effect of this Agreement | 1 |
| **2** | **GOVERNANCE OF THE COMPANY** | **GOVERNANCE OF THE COMPANY** | **1** |
|  | 2.1 | Voting and Designation of Non-Executive Directors | 1 |
| **3** | **TERMINATION OF THIS AGREEMENT** | **TERMINATION OF THIS AGREEMENT** | **2** |
|  | 3.1 | Termination of this Agreement | 2 |
| **4** | **MISCELLANEOUS** | **MISCELLANEOUS** | **2** |
|  | 4.1 | No Joint and Several Liability | 2 |
|  | 4.2 | No Company Information Sharing | 2 |
|  | 4.3 | Amendment | 2 |
|  | 4.4 | No assignment | 3 |
|  | 4.5 | Notices | 3 |
|  | 4.6 | Severability | 3 |
|  | 4.7 | Waiver | 4 |
|  | 4.8 | Publicity | 4 |
|  | 4.9 | Costs and fees | 4 |
|  | 4.10 | Governing Law and Jurisdiction | 4 |
|  | 4.11 | Counterparts | 4 |
|  | 4.12 | Entire agreement | 4 |
|  | 4.13 | Further assurances | 4 |
|  | 4.14 | Good faith consultation | 5 |
|  | 4.15 | Specific Performance | 5 |
| **EXHIBIT 1.1** | **EXHIBIT 1.1** | **Definitions** | **8** |

---

-i-

**ACKNOWLEDGEMENT AGREEMENT**

**THIS ACKNOWLEDGEMENT AGREEMENT (THIS "*AGREEMENT*") IS DATED MAY 12, 2026 (THE "*EXECUTION DATE*") AND MADE BETWEEN:**

(1) **MONEX GROUP, INC.,** a stock company (*kabushiki kaisha*), with its registered address at ARK Mori Building 25F, 1-12-32 Akasaka,
 Minato-ku, Tokyo 107-6025, Japan, and incorporated under the laws of Japan ()"**Monex** ");
 and

(2) **KDDI CORPORATION,** a stock company (*kabushiki kaisha*), with its registered address at 2-3-2, Nishishinjuku, Shinjuku-ku, Tokyo,
 Japan, and incorporated under the laws of Japan ()"**KDDI** "),

together the "**Parties**" and each a "**Party**."

**BACKGROUND:**

WHEREAS, KDDI and Coincheck Group N.V. (the "**Company**") have entered into the "Share Subscription and Investor Rights Agreement" dated as of the Execution Date (the "**SSA**");

WHEREAS, pursuant to the SSA, KDDI has the right, in accordance with the terms of the SSA, to designate one (1) non-executive director nominee to serve on the board of directors of the Company; and

WHEREAS, Monex has agreed to enter into this Agreement with KDDI to confirm its acknowledgement of the said right of KDDI, and the execution and delivery of this Agreement by the Parties is a condition precedent to the completion and closing of the SSA.

NOW, THEREFORE, in consideration of the mutual covenants and agreements hereinafter set forth and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties agree as follows:

---

| | |
|:---|:---|
| **1** | **GENERAL** |

---

**1.1** **Certain Definitions** 

The terms set out in Exhibit 1.1, when used in this Agreement, shall have the meanings ascribed to them therein.

**1.2** **Effect of this Agreement** 

Except for the provisions of Sections 1, 3, and 4, which shall take effect on the Execution Date, this Agreement shall enter into effect on the date KDDI becomes a holder of the Company's ordinary shares ("Ordinary Shares") issued by the Company pursuant to the SSA.

---

| | |
|:---|:---|
| **2** | **GOVERNANCE OF THE COMPANY** |

---

**2.1** **Voting and Designation of Non-Executive Directors** 

2.1.1 Monex acknowledges that, under the SSA, KDDI has the right to nominate one (1) director to serve as
 non-executive director of the Company for appointment by the general meeting of shareholders of the Company in accordance with, and
 subject to, the terms and conditions of the SSA related thereto (each such nominee from time to time, the **"Investor Nominee"**).

2.1.2 Monex shall vote all Ordinary Shares (and any other voting securities) of the Company held by it to elect, at each general meeting of
the Company where the Investor Nominee is to be voted upon, the Investor Nominee, as proposed by the Board in accordance with the SSA
and in accordance with the governance documents of the Company publicly disclosed on the Company's website (https://www.coincheckgroup.com/corporate-governance/governance-documents),
as a member of the Board, unless the appointment of such Investor Nominee would constitute a violation of any applicable Laws.

---

| | |
|:---|:---|
| **3** | **TERMINATION OF THIS AGREEMENT** |

---

**3.1** **Termination of this Agreement** 

3.1.1 This Agreement may be terminated only if:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) the Parties agree in writing to terminate this Agreement;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) KDDI ceases to have the right to nominate an Investor Nominee
under the SSA; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) the SSA is terminated.

3.1.2 The termination of this Agreement shall not release any Party from any liability or obligation which has already accrued as of or before
the effective date of termination, nor constitute a waiver or release of any such liability or obligation.

3.1.3 The rights and obligations of the Parties under Section 3.1.2, this Section 3.1.3, Section 4.1, Section 4.2 and Section 4.4 to Section
4.12 shall survive any termination of this Agreement, and any termination of this Agreement shall only be effective prospectively and
shall not affect the validity of the obligations under this Agreement before such termination.

---

| | |
|:---|:---|
| **4** | **MISCELLANEOUS** |

---

**4.1** **No Joint and Several Liability** 

The obligations and claims of each Party under this Agreement to the other Party shall not constitute joint and several liabilities with any other Person.

**4.2** **No Company Information Sharing** 

The Parties acknowledge and agree that this Agreement is solely about Monex agreeing to vote its Ordinary Shares in a manner consistent with KDDI's rights to nominate the Investor Nominee under the SSA, and that this Agreement contemplates no information sharing by Monex regarding Company business, affairs, or other information, and that any information rights KDDI may have concerning the Company are set forth in, and governed by, solely the SSA and applicable Law.

**4.3** **Amendment** 

No amendment of this Agreement shall be effective unless such amendment is in writing and signed by or on behalf of each Party.

**4.4** **No assignment** 

Except as otherwise agreed by the Parties, no Party may assign this Agreement or assign or encumber any of their rights under this Agreement to any other Person, without the written consent of the other Party; it being understood that without this consent, no assignment, encumbrance or transfer may be effected.

**4.5** **Notices** 

4.5.1 Any notice, request, consent, claim, demand and other communication between the Parties in connection with this Agreement must be in
writing and be given and be deemed to have been duly given if written in the English language and:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) delivered personally;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) sent by an internationally recognized overnight courier service,
with a copy by email, which copy does not constitute a notice; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) sent by email (following confirmation of receipt).

4.5.2 The notices under this Agreement shall be deemed to be:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) in the case of notices delivered personally, sent and received
on the date of receipt;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) in the case of notices sent by internationally recognized
overnight courier service, sent at the date of collection shown on the monitoring document produced by the international courier service
and received on the third Business Day following the day of sending; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) in the case of notices sent by e-mails, any such notice shall
be deemed received at the time it is received in the recipient's time zone; provided that (i) if received between 12:00 a.m. and
5:00 p.m. in the recipient's time zone, it shall be deemed received on such day (or, if such day is not a Business Day, on the
next Business Day), and (ii) if received between 5:00 p.m. and 11:59 p.m. in the recipient's time zone, it shall be deemed received
on the following day (or, if such following day is not a Business Day, on the next Business Day).

4.5.3 All notices must be sent to the Persons and at the addresses set out in Exhibit 4.5.3, or such other Persons or addresses as notified
to the other Party from time to time. Any change to the designated Persons or addresses shall be promptly notified to the other Party
and shall not be effective unless and until written notice of such change has been given to the other Party in accordance with this Section
4.5. **4.6** **Severability** 

If any provision of this Agreement becomes or is declared by a court of competent jurisdiction to be illegal, unenforceable or void, such provision or part shall to that extent be deemed not to form part of this Agreement, but the legality, validity and enforceability of the remainder of this Agreement shall not be affected. The Parties shall use reasonable efforts to agree a replacement provision that is legal, valid and enforceable and that achieves, so far as possible, the intended effect of the illegal, invalid or unenforceable provision.

**4.7** **Waiver** 

No failure to exercise, nor any delay in exercising, by a Party, any right or remedy under this Agreement will operate as a waiver. No single or partial exercise of any right or remedy will prevent any further or other exercise or the exercise of any other right or remedy.

**4.8** **Publicity** 

The Parties shall consult with each other before issuing press releases or otherwise making any public statements with respect to this Agreement, and neither Party shall issue any such press release or public statement without the prior written consent of the other Party, provided that such consent shall not be required to the extent the public announcement is (i) required by Law or by the rules, requests, orders, notices, administrative guidance, or other determinations, whether oral or in writing, of any Governmental Authority, and (ii) following reasonable consultation with the other Party, cannot or can no longer be delayed under applicable Law.

**4.9** **Costs and fees** 

Each Party shall bear and pay all of its own expenses in connection with this Agreement and the transactions contemplated hereby.

**4.10** **Governing Law and Jurisdiction** 

This Agreement shall be governed by, and construed in accordance with, the laws of Japan. With respect to any dispute arising out of or in relation to this Agreement, the Parties shall first discuss with each other in good faith with a view to resolving such dispute. If the Parties are not able to reach an agreement through such discussion, the Parties agree to submit to the exclusive jurisdiction of the Tokyo District Court to resolve such dispute.

**4.11** **Counterparts** 

This Agreement may be entered into in any number of counterparts, all of which taken together shall constitute one and the same instrument. The Parties may enter into this Agreement by signing any such counterpart.

**4.12** **Entire agreement** 

This Agreement contains the entire agreement between the Parties relating to the subject matter of this Agreement, to the exclusion of any terms implied by Law which may be excluded by contract, and supersedes any previous written or oral agreement between the Parties to this Agreement in relation to the matters dealt with in this Agreement.

**4.13** **Further assurances** 

The Parties shall at their own costs and expenses from time to time execute and procure to be executed such documents and perform and procure to be performed such acts as may be reasonable required by each of them to give the Parties the full benefit of this Agreement.

**4.14** **Good faith consultation** 

The Parties shall consult in good faith to resolve matters not set forth in this Agreement or any questions arising in connection with this Agreement.

**4.15** **Specific Performance** 

The Parties agree that the obligations imposed on them in this Agreement are special, unique and of an extraordinary character, and that, in the event of breach by any Party, damages would not be an adequate remedy and the other Party shall be entitled to specific performance and injunctive relief in addition to any other remedy to which it may be entitled, at law or in equity; and the Parties further agree to waive any requirement for the securing or posting of any bond in connection with the obtaining of any such injunctive or other equitable relief.

(*signature page follows*)

IN WITNESS WHEREOF, this Agreement has been executed by the Parties as of the Execution Date.

---

| | |
|:---|:---|
| **MONEX GROUP, INC.** | **MONEX GROUP, INC.** |
| /s/ Yuko Seimei | /s/ Yuko Seimei |
| By: | Yuko Seimei |
| Title: | Representative Executive Officer & CEO |

---

***Signature page to Acknowledgement Agreement***

IN WITNESS WHEREOF, this Agreement has been executed by the Parties as of the Execution Date.

---

| | |
|:---|:---|
| **KDDI CORPORATION** | **KDDI CORPORATION** |
| /s/ Hiromichi Matsuda | /s/ Hiromichi Matsuda |
| By: | Hiromichi Matsuda |
| Title: | President, Representative Director, CEO |

---

***Signature page to Acknowledgement Agreement***

**EXHIBIT 1.1**

<u>Definitions</u>

---

| | |
|:---|:---|
| **Defined Term** | **Meaning** |
| Agreement | This term has the meaning set forth in the Preamble |
| Business Day | Any day (other than a Saturday, Sunday or public holiday) on which banks are open for normal business (other than internet banking services only) in the Netherlands, the United States and Japan |
| Board | The board of directors of the Company |
| Company | This term has the meaning set forth in the Recitals |
| Execution Date | This term has the meaning set forth in the Preamble |
| Governmental Authority | Any supranational, national, state, provincial, municipal or other governmental authority or court, tribunal, arbitrator, administrative agency, commission or other authority or instrumentality, or any stock exchange or similar self-regulatory organization of a relevant jurisdiction (including any subdivision thereof) or any quasi-governmental or private body exercising any regulatory, taxing, importing or other governmental or quasi-governmental authority, including the European Union, in each case to the extent such authority has jurisdiction in respect of the relevant matter |
| Investor Nominee | This term has the meaning set forth in Section 2.1.1 |
| KDDI | This term has the meaning set forth in the Preamble |
| Law | Any applicable statute, law, directive, rule, (executive or other) order, code, judgment, injunction decree or other binding requirement of any Governmental Authority, in each case as may be in force from time to time |
| Monex | The term has the meaning set forth in the Preamble |
| Ordinary Shares | This term has the meaning set forth in Section 1.2 |
| Party or Parties | These terms have the meanings set forth in the Preamble |
| Person | An individual, a company or corporation, a partnership, a limited liability company, a trust, an association, a foundation or other legal entity or unincorporated organization, including any Governmental Authority |
| SSA | This term has the meaning set forth in the Recitals |

---

**EXHIBIT 4.5.3**

<u>Notices</u>

[Omitted]

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 1)**

**Coincheck Group N.V.**

*(Name of Issuer)*

**Ordinary Shares**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Yuko Seimei**<br>Monex Group, Inc.<br>ARK Mori Building 25F 1-12-32<br>Akasaka, Minato-ku, Tokyo M0 107-6025<br>81-3-4323-8698

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

**05/12/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**MONEX GROUP, INC.** | Name of reporting person<br>**MONEX GROUP, INC.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**M0** | Citizenship or place of organization<br>**M0** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**136247594.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**136247594.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**136247594.00** | Aggregate amount beneficially owned by each reporting person<br>**136247594.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**83.6%** | Percent of class represented by amount in Row (11)<br>**83.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Ordinary Shares

**(b) Name of Issuer:**
Coincheck Group N.V.

**(c) Address of Issuer's Principal Executive Offices:**
Nieuwezijds Voorburgwal 162, Amsterdam, P7, 1012 SJ

This Amendment No. 1 ("Amendment No. 1") to Schedule 13D relates to the ordinary shares ("Ordinary Shares") of Coincheck Group N.V. (the "Issuer"), and amends and supplements the initial statement on Schedule 13D filed on March 19, 2026 (as so amended, the "Schedule 13D"). Capitalized terms used but not defined in this Amendment No. 1 shall have the same meanings ascribed to them in the Schedule 13D.

**Item 4. Purpose of Transaction**

Item 4 of the Schedule 13D is hereby amended and supplemented by the following:

The information in Item 6 of this Schedule 13D is incorporated herein by reference.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

Item 6 of the Schedule 13D is hereby amended and supplemented by the following:

On May 12, 2026, the Issuer and KDDI Corporation ("KDDI") entered into a Share Subscription and Investor Rights Agreement ("SSA"), pursuant to which, among other things, KDDI has the right pursuant to the SSA to designate one non-executive director nominee (the "KDDI Nominee") to serve on the board of directors of the Issuer (the "Board").  Concurrently with entering into the SSA, the Reporting Person agreed to enter into an Acknowledgement Agreement with KDDI (the "Acknowledgement Agreement"), the execution and delivery of which is a condition precedent to the completion and closing of the SSA.  Pursuant to the terms of the Acknowledgement Agreement, the Reporting Person has agreed to vote all Ordinary Shares (and any other voting securities) of the Issuer held by it to elect, at each general meeting of the Issuer where the KDDI Nominee is to be voted upon, the KDDI Nominee, as proposed by the Board in accordance with the SSA and the governance documents of the Issuer, as a member of the Board, unless the appointment of such nominee would constitute a violation of any applicable laws.

The Acknowledgement Agreement shall be terminated if the parties agree in writing to terminate such agreement, KDDI ceases to have the right to nominate a KDDI Nominee under the SSA, or the SSA is terminated.

The foregoing description of the Acknowledgement Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of such agreement, a copy of which is filed as Exhibit 99.4 to this Schedule 13D and is incorporated herein by reference.

### 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.

**Reporting Person:** MONEX GROUP, INC.

**Signature:** /s/ Yuko Seimei

**Name/Title:** Yuko Seimei, Representative Executive Officer

**Date:** 05/14/2026