Company: CNCKW
Filing Date: 2025-08-21
Form Type: 6-K
Source: 0001628280-25-040947
Chunk: 1

Company: Coincheck Group N.V.
Filing Date: 2025-08-21
Form: 6-K
Chunk 1
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eded by documents or reports subsequently filed or furnished.

### EXHIBIT INDEX

#### Exhibit No.

#### Description

### 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: August 21, 2025 |     | COINCHECK GROUP N.V. 
 By:                  |     | /s/ Gary A. Simanson |     |                                       |
|:----------------------|:----|:---------------------|:----|:---------------------|:----|:--------------------------------------|
|                       |     |                      |     | Name:                |     | Gary A. Simanson                      |
|                       |     |                      |     | Title:               |     | Chief Executive Officer and President |