ETF Size: Multi-Cap ETFs, or exchange-traded funds, are a type of investment vehicle that allows investors to pool their money together and invest in a basket of assets. ETFs trade on stock exchanges and can be bought and sold throughout the day. One type of ETF is a multi-cap ETF, which invests in companies of all sizes. Multi-cap ETFs offer exposure to a wide range of companies and can provide diversification benefits. However, they may also be more volatile than ETFs that focus on specific market capitalizations. investors should carefully consider their goals and risk tolerance before investing in any ETF.