Generated June 2026 from current fund data.
Overview
SPY and VOO are both passively managed ETFs tracking the S&P 500 Index, holding the same 500 large-cap U.S. stocks in identical weights. The funds are nearly fungible on strategy but differ materially on cost: VOO's 0.03% expense ratio undercuts SPY's 0.10% by 7 basis points annually, and VOO has grown to become the larger fund by AUM ($1033B vs. $783B). SPY, launched in 1993, predates VOO by 17 years and carries a modest yield premium.
How they differ
The primary difference is expense ratio. VOO charges 0.03% while SPY charges 0.10%, a 7-basis-point gap that compounds over decades into meaningful performance separation. On a $100,000 investment, that spread costs SPY investors roughly $70 more per year in direct fees.
Second, VOO has captured significantly more assets—$1033B to SPY's $783B—which amplifies its scale advantage and narrows the cost-to-serve differential for new investors. SPY yields 1.04% against VOO's 1.11%, a modest 7-basis-point edge that partially offsets SPY's fee disadvantage but doesn't close it. Both funds settle quarterly distributions and carry identical market beta (1.0), so tracking error from holdings or rebalancing is immaterial.
Who each is best for
SPY: Fits investors with a long history trading the fund or those who value the 30-year track record and institutional familiarity that comes with the oldest U.S. equity ETF.
VOO: Designed for buy-and-hold investors prioritizing cost efficiency and willing to accept that VOO's newer inception date (2010) carries no meaningful risk penalty given identical index exposure and vastly lower fees.
Key risks to know
- Index concentration in mega-cap tech. Both funds carry identical exposure to the "Magnificent Seven" and other technology leaders, which now represent roughly a third of S&P 500 market weight. A sustained tech correction would hurt both equally.
- Tracking error from cash drag and fund flows. Large inflows or outflows can create temporary cash positions that lag the index; SPY's higher expense ratio may amplify this drag on a percentage basis, though the effect is typically small.
- Tax drag from quarterly dividend reinvestment timing. Investors must reinvest dividends at whatever price prevails at the distribution date; if markets rally sharply between ex-dividend and payment dates, reinvestment occurs at a higher cost. This timing risk is identical for both funds.
Bottom line
If you prioritize minimizing annual costs on a passive S&P 500 position, VOO's 7-basis-point fee advantage and larger asset base make it the economically cleaner choice over a multi-decade horizon. If you already own SPY or value its longer institutional history, the fee gap alone doesn't justify switching. Past performance does not predict future results.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.