Company: CNCKW
Filing Date: 2025-11-07
Form Type: 6-K
Source: 0001913847-25-000019
Chunk: 0

Company: Coincheck Group N.V.
Filing Date: 2025-11-07
Form: 6-K
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, DC 20549

#### FORM 6-K

### REPORT OF FOREIGN PRIVATE ISSUER

#### PURSUANT TO RULE 13a-16 OR 15d-16 UNDER

#### THE SECURITIES EXCHANGE ACT OF 1934

#### For the month of

#### November 2025

#### Commission File Number: 001-42438

#### COINCHECK GROUP N.V.
<div align='center'>(Translation of registrant’s name into English)</div>

#### Nieuwezijds Voorburgwal 162

#### 1012 SJ Amsterdam

#### The Netherlands
<div align='center'>(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F: Form 20-F ☒ Form 40-F ☐</div>

Coincheck Group N.V. (“Coincheck Group”) is furnishing this Report on Form 6-K to provide the below update to investors:

On November 7, 2025, Monex Group, Inc. (“Monex”), a Japanese joint stock company (kabushiki kaisha) listed on the Tokyo Stock Exchange, and the controlling shareholder of Coincheck Group, released its financial results for the second quarter of the fiscal year ended March 31, 2026. Monex’s update includes certain information related to Coincheck Group, which is denoted as “Crypto Asset Segment,” “Coincheck, Inc.,” “Coincheck Group N.V.” and “Coincheck.” The results are publicly available at https://www.monexgroup.jp/en/investor.html, where Monex has posted a Consolidated Financial Summary, Presentation Materials, and a DATABOOK. The aforementioned information relates to Monex on a consolidated basis, which includes certain segment data related to Coincheck Group, in addition to data for other segments that are not related to the results of Coincheck Group. Such information should not be viewed as a substitute for the earnings information for the second quarter of the fiscal year ending March 31, 2026 that Coincheck Group plans to announce on Wednesday, November 12, 2025, as previously disclosed. The results published by Monex present only limited metrics related to Coincheck Group and are based on different accounting standards and presentation styles as compared to the standards and formatting utilized by Coincheck Group. Furthermore, the Monex