The Vanguard S&P 500 ETF (VOO) has delivered stronger returns than the SPDR Dow Jones Industrial Average ETF (DIA) so far in 2026.
As of May 8, 2026, VOO achieved an 8.47% year-to-date return, surpassing DIA's 3.24% return over the same period.
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Key Differences in Index Methodology
The performance gap stems from fundamental differences in how the two ETFs track their underlying indexes.
DIA follows the Dow Jones Industrial Average, which uses a price-weighting system. This means stocks with higher share prices have more influence, regardless of company size.
In contrast, VOO tracks the S&P 500 index using market-cap weighting. Companies with larger market capitalizations carry greater weight.
The Dow Jones Industrial Average consists of 30 manually selected blue-chip stocks, with heavy exposure to industrials, financials, and healthcare.
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Due to price-weighting, firms like UnitedHealth, Goldman Sachs, and Caterpillar hold larger positions than even massive companies like Apple, simply because their share prices are higher.
VOO's market-cap approach automatically allocates more to companies that the market rewards, leading to substantial exposure to mega-cap technology firms.
This strategy amplifies gains during tech-driven market expansions but can also magnify losses when leadership shifts away from technology.
Long-Term Performance and Costs
The performance difference widens significantly over longer time horizons.
Over the past five years, VOO returned 87.62%, while DIA returned 42.62%.
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Over ten years, VOO's return reached 318.99%, compared to DIA's 176.86%.
Cost structures also favor VOO. The Vanguard ETF has an expense ratio of 0.03%, while DIA's expense ratio is 0.16%.
However, DIA can outperform VOO during specific market conditions, such as value rotations and cyclical economic recoveries.
During these periods, financial and industrial stocks often outpace the broader technology sector, giving DIA a temporary edge.
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Investors should consider their investment horizon and risk tolerance when choosing between these two ETFs.
