This study aims to examine the effect of biological assets disclosure on firm value with ownership concentration as a moderating variable. The sample used in this study was all agricultural companies listed on the Indonesia Stock Exchange in 2015-2018. The sample was selected by purposive sampling method. The analytical tool utilized was a multiple regression analysis using SPSS15. This study's results indicated that disclosure of biological assets positively influenced firm value, and ownership concentration did not affect biological assets disclosure on firm value. This study helps the standards board look at the disclosure of biological assets in Indonesia and increase Indonesian agricultural companies' competitiveness by increasing the disclosure of information on biological assets.