ROA = Net Income for Shareholders over past financial year/ Average total assets of the company over past financial year.
Net income for shareholders, and total assets can be found in annual reports of companies.
A higher return on Assets generally means the company is able to deliver more income with fewer or the same level of assets.
Companies that have high ROA in the STI
Thai Beverage: 18.6%
Sembcorp Marine: 9.9%
SIA engineering: 16.7%
Sing Tech Eng: 7.5%