Company: CNCKW
Filing Date: 2025-11-28
Form Type: 6-K
Source: 0001913847-25-000036
Chunk: 0

Company: Coincheck Group N.V.
Filing Date: 2025-11-28
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>

On November 28, 2025, Coincheck Group N.V. (“Coincheck Group” or the “Company”) posted on its website, www.coincheckgroup.com, a presentation regarding itself and its subsidiaries (the “Presentation”), which is furnished as Exhibit 99.1 to this Report on Form 6-K (“this report”). Coincheck Group uses its website to distribute company information, such as the Presentation, 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; however, by filing this report, and furnishing the information contained in the Presentation, the Company makes no admission as to the materiality of any such information. 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. The information contained in the Presentation is not intended to be comprehensive about the subject matter it covers, and should be read only as a supplement to Coincheck’s public disclosures and in conjunction with the Company