有些不一样

- In the United States, the top 3,000 stocks (those of the 3,000 largest companies)make up the broad-market Russell 3000 Index. The top 1,000 of those companiesmake up the large-cap Russell 1000 Index, and the bottom 2,000 (the smallest companies) make up the small-cap Russell 2000 Index. 

Russell 2000 占8%，Russell 1000 占92%

- The Nasdaq Composite Index is the market capitalization-weighted index of approximately 3,000 common equities listed on the Nasdaq stock exchange. The types of securities in the index include American depositary receipts, common stocks, real estate investment trusts (REITs) and tracking stocks, as well as limited partnership interests. The index includes all Nasdaq-listed stocks that are not derivatives, preferred shares, funds, exchange-traded funds (ETFs) or debenture securities.

QQQ 是NASDAQ 100，其中AAPL，GOOG/GOOGL，AMZN，FB，MSFT，NFLX 占了40%