While both VOOG (Vanguard S&P 500 Growth ETF) and QQQ

(Invesco QQQ Trust) are large-cap growth ETFs, VOOG tracks the S&P 500 Growth Index, focusing on the fastest-growing companies within the S&P 500, while QQQ tracks the Nasdaq-100 Index, which primarily includes large, non-financial companies listed on the Nasdaq stock exchange, making them similar but not identical in terms of the companies they hold; however, both are considered to have significant exposure to technology stocks like Apple and Microsoft. 

 

Key Differences: 

• Index Tracked: VOOG tracks the S&P 500 Growth Index, whereas QQQ tracks the Nasdaq-100 Index. 
   
• Composition: VOOG may have a broader range of sectors within the S&P 500, while QQQ is more focused on technology companies listed on the Nasdaq. 
   
• Expense Ratio: VOOG typically has a lower expense ratio compared to QQQ.