The Missing Regulation on "Win Rate" Claims: Gaps in Advertising Regulation for FX/CFD Information Products in Japan, and Four Proposals for Reform

This paper points out, through case analysis and international comparison, that Japan's regulatory framework under the Financial Instruments and Exchange Act lacks specificity in regulating the advertising of FX/CFD-related information products and paid content, when compared with other jurisdictions. In particular, advertisements that highlight only a "win rate" are statistically incomplete: a high win rate can coexist with an annual net loss, and a low win rate can coexist with an annual net profit, as this paper demonstrates with concrete numerical examples. Whereas the EU and UK legally mandate the disclosure of a provider's actual client loss rate in CFD advertising, Japan's FSA supervisory guidelines contain no explicit list of prohibited advertising phrases, relying instead on ad hoc, after-the-fact substantive judgment in individual cases. This paper presents four concrete proposals to close this institutional gap: (1) explicit prohibition of specific advertising phrases, (2) prohibition of monetizing unregistered advisory-equivalent activity itself, (3) a "freshness" limit on the use of past performance claims, and (4) a mandatory minimum verification period for disclosed performance results.