Yes, you can trade any stock listed in the PSE, provided that the stock is not suspended for trading.
The PSE has two listing boards: the Main Board and the SME board. The SME board, as the acronym suggest, is meant for the trading of shares in small and medium enterprises. The capital, profitability, and other financial requirements for listing in the SME board are less stringent than the Main Board. Potential investors should note that companies listed at SME Board are comparatively exposed to higher investment risk.