Company: CNCKW
Filing Date: 2025-08-21
Form Type: 6-K
Source: 0001628280-25-040947
Chunk: 0

Company: Coincheck Group N.V.
Filing Date: 2025-08-21
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 August 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>

On August 21, 2025, Coincheck Group N.V. (“Coincheck Group”) announced the convocation of an annual general meeting of shareholders to be held on September 23, 2025. The notice of the annual general meeting of shareholders is furnished as Exhibit 99.1 to this Report on Form 6-K and posted to Coincheck Group’s website (https://www.coincheckgroup.com/) under “Governance—General Meetings,” along with related materials. Coincheck Group uses its website to distribute company information and makes available free of charge a variety of information for investors, including its filings with the Securities and Exchange Commission (“SEC”), as soon as reasonably practicable after electronically filing that material with, or furnishing it to, the SEC. The information that Coincheck Group posts on its website may be deemed material. Accordingly, investors should monitor Coincheck Group’s website, in addition to following its press releases, filings with the SEC, and public conference calls and webcasts. In addition, investors may opt in to automatically receive email alerts and other information about Coincheck Group when enrolling their email address by visiting the “Email Alerts” section of the Coincheck Group website. Coincheck Group does not incorporate the information contained on, or accessible through, Coincheck Group’s website or related social media channels into this Report on Form 6-K.

The information in this Report on Form 6-K is incorporated by reference into Coincheck Group’s Registration Statement on Form S-8 (File No. 333-286190), to the extent not supers