an investment portfolio
a property portfolio
have/hold a portfolio These funds are less risky because you hold a portfolio selected and monitored by a specialist manager.
build (up) a portfolio You could build up a portfolio including UK funds.
a balanced/diversified portfolio It's a diversified portfolio, which will lower the risk.
a global/international portfolio These funds are impossible to ignore if you want a broad international portfolio.
a bond/stock/share portfolio These shares should amount to no more than 10 or 20% of a stock portfolio.