**Key Points:**
The Vanguard S&P 500 ETF (NYSEMKT: VOO) has seen significant gains in recent years, largely driven by enthusiasm for AI, with its top ten holdings accounting for nearly 40% of the index. Currently, eight of its ten largest holdings are technology-related stocks, including Nvidia at 7.6%. In contrast, the Invesco S&P 500 Equal Weight ETF (NYSEMKT: RSP) shows less concentration, with its top ten holdings making up just over 3% of its total assets.
The Vanguard S&P 500 ETF has delivered an annualized total return exceeding 15% over the past decade, outperforming the historical average of around 10% for the S&P 500. However, the concentration of its largest stocks has doubled, surpassing levels seen during the dot-com bubble. Conversely, if Moderna—RSP’s top holding averaging around 0.6%—were to decline significantly, its impact on the ETF’s overall performance would be minimal.
Investors should be cautious about VOO’s heavy reliance on a few tech stocks, as potential downturns in these holdings could greatly affect returns. In a scenario where the top holdings exceed 50% of the ETF, a shift towards RSP may provide more downside protection.
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