This study investigates the disclosures of financial ratios of FTSE100 non-financial companies and the determinants of these disclosures. Among the determinants of the disclosure level, industry type has been found to be the major determinant. This study recommends further investigation to find other variables that may have an effect on financial ratio disclosure level and recommends the regulator to impose a standardised set of financial ratios to be mandatorily disclosed by companies in their annual reports.