Equity Investment

Hello Dear tutor According to IFRS 9 when a company buys the shares of another company. As far as I know the company can use either FVTPL or FVTOCI in order to recogise its investment at the year end ( in the owner's individual accounts). But what is there is no active market for those shares? I mean if the company buys the shares of unquoted company, then what should we do? I think we should use cost model but why IFRS 9 states nothing about this situation when the shares are unquoted?! Or maybe I am wrong? Regards