This paper examines the relationship between factors that deter or promote disclosures and the quantity or quality of segment information in Japanese firms. Deterring factors are divided into proprietary and agency costs, while promoting factors include stock compensation and investor multi-nationality. The multivariable analysis with manually collected data demonstrates that the relationships between disclosure and these costs or motivations are divergent. Notably, proprietary costs sometimes have the opposite impact depending on the product market competition types. Regarding the promoting factors, stock compensation tends to deter disclosure, in contrast to the relatively insignificant impact of foreign investors. In addition, the interaction of both factors implies some indirect effects on segment information through other factors, although the results are inconclusive and unclear. These findings can contribute to the inconsistent literature on disclosure determinants by indicating a potential solution: considering their multiple aspects and interactive nature.