The Nasdaq-100 is an index of the 100 largest companies listed on the Nasdaq stock exchange, excluding banks and financial institutions. But for young investors in their 20s, taking a little more risk for the opportunity to earn higher returns can be a worthwhile compromise. Continue »Therefore, if I were that age today, here's why I'd buy the Invesco QQQ Trust (NASDAQ: QQQ), an exchange-traded fund (ETF) that mimics the Nasdaq-100, with the intention of holding it until retirement. Many of those tech companies have blossomed into trillion-dollar giants and now sit among the top 10 holdings in the Nasdaq-100 and Invesco QQQ ETF. Stock Invesco ETF Portfolio Weighting Market Capitalization 1.