Company: CNCKW
Filing Date: 2025-11-28
Form Type: 6-K
Source: 0001913847-25-000036
Chunk: 1

Company: Coincheck Group N.V.
Filing Date: 2025-11-28
Form: 6-K
Chunk 1
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’s other filings made with the SEC, in particular the Company’s most recent Annual Report on Form 20-F and most recent reports on Form 6-K. The information in this report is incorporated by reference into Coincheck Group’s Registration Statement on Form S-8 (File No. 333-286190), to the extent not superseded by documents or reports subsequently filed or furnished.

The Presentation contains “forward-looking statements.” Any statements that express or involve matters regarding predictions, expectations, beliefs, plans, projections, objectives, goals, assumptions, or future events or performance are not statements of historical facts and may be “forward-looking statements.” Forward-looking statements are based on expectations, estimates, and projections at the time the statements are made and involve a number of risks and uncertainties which could cause actual results or events to differ materially from those presently anticipated, including the risks discussed in the filings of Coincheck Group N.V. with the SEC, including its Annual Report on Form 20-F for the fiscal year ended March 31, 2025, as such factors may be updated from time to time, which are or will be accessible on the SEC’s website at www.sec.gov. Forward-looking statements may be identified through the use of words such as “expects,” “will,” “anticipates,” “estimates,” “believes,” or by statements indicating certain actions "may,” "could,” “should,” or “might” occur or similar words or phrases, or the negatives of those words or phrases. The Company undertakes no obligation to publicly update or review any forward-looking statement, whether as a result of new information, future developments, or otherwise, except as required by law. You are cautioned not to place undue reliance on these forward-looking statements.

### EXHIBIT INDEX
| Exhibit No. |     | Description  |
| 99.1        |     | Presentation |

<div align='center'>1</div>

### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

| Date: November 28, 2025 |     | COINCHECK GROUP N.V. 
 By:                  |     | /s/ Gary A. Simanson |     |                                       |
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