Company: CNCKW
Filing Date: 2025-05-20
Form Type: 424B3
Source: 0001213900-25-046039
Chunk: 0

Company: Coincheck Group N.V.
Filing Date: 2025-05-20
Form: 424B3
Chunk 0
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| PROSPECTUS SUPPLEMENT NO. 1             
 (to the Prospectus dated April 8, 2025) |     | Filed Pursuant to Rule 424(b)(3) 
 Registration No. 333-284537      |

<div align='center'>COINCHECK GROUP N.V.

Primary Offering of4,860,148 Ordinary Shares Underlying Warrants

Secondary Offering of127,895,040 Ordinary Shares
129,611 Warrants to Purchase Ordinary Shares and
129,611 Ordinary Shares Underlying Warrants</div>

This prospectus supplement amends the prospectus
dated April 8, 2025 (as supplemented or amended from time to time, the “Prospectus”) of Coincheck Group N.V., which forms
a part of our Registration Statement on Form F-1 (No. 333-284537). This prospectus supplement is being filed to update and supplement
the information included in the Prospectus with the information contained in the press release attached to our Report on Form 6-K, which
was furnished to the Securities and Exchange Commission on May 13, 2025 (the “SEC”), relating to our financial results for
our fourth quarter and year ended March 31, 2025. Accordingly, we have attached such press release to this prospectus supplement. Capitalized
terms used in this prospectus supplement and not otherwise defined herein have the meanings specified in the Prospectus.

Our Ordinary Shares and Public Warrants are listed
on the Nasdaq Global Market (“Nasdaq”) under the symbols “CNCK” and “CNCKW,” respectively. Holders
of Ordinary Shares and Public Warrants should obtain current market quotations for their securities. On May 19, 2025, the last reported
sale prices for our Ordinary Shares and Public Warrants on Nasdaq were $6.23 per share and $1.21 per warrant, respectively.

We are a “foreign private issuer” as
defined under the U.S. federal securities laws and, as such, may elect to comply with certain reduced public company disclosure and
reporting requirements. See “Prospectus Summary — Implications of Being a Foreign Private Issuer and a Controlled
Company.”

This prospectus supplement should be read in conjunction
with the Prospectus, including any amendments or supplements thereto, which is to be delivered with this prospectus supplement. This prospectus
supplement is qualified by reference to the Prospectus, including any amendments or supplements thereto,