This research aimed is to find out the factors influencing decision-making in mining firms listed in Indonesian Stock Exchange, Bursa Malaysia, the stock Exchange of Thailand, the Philippines Stock Exchange and Singapore Exchange from 2014 to 2018. This study employed multiple linear regression to examine independent variable influences such as cash flow, firm size, leverage and investment opportunities. Total asset growth is the metric used to calculate investment decision. Secondary data were retrieved by the audited Mining Corporation Report and Annual Reports from the Indonesian Stock Exchange, Bursa Malaysia, the Philippines Stock Exchange, the Singapore Exchange and the Stock Exchange of Thailand from 2014 to 2018 in web.idx.id, www.bursamalaysia.com.com, www.pse.com.ph, www.set.or.th and the www2.sgx.com/ The findings suggest that cash flow and firm size have a beneficial impact on investment decision-making, leverage has a detrimental influence on investment decision-making whereas acquisition incentives have little impact on investment decision-making.