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Dividend Vision

ETF Comparison

OEF vs VOO: The Biggest 100, or the Full S&P 500?

A head-to-head of iShares S&P 100 and Vanguard S&P 500 covering concentration, cost, and overlap.

Data updated September 4, 2026

Best for

  • OEFInvestors who want broad equity exposure.
  • VOOInvestors who want simple, diversified core exposure in one low-cost fund.

Jump to the side-by-side numbers

Visual comparison

Key metrics

Projected income on $10K

Projections assume the current yield and share price remain constant. Actual results will vary.

Total returns

OEF has lagged VOO over the trailing twelve months, posting a 20.45% total return against 21.07%. The picture flips over 10 years, though — OEF has compounded at 16.44% a year, ahead of VOO at 15.32%. Figures are total returns: price change plus every distribution reinvested.

Total return and risk statistics by fund. Each row is one fund; each column is one period or statistic.
SymbolYTD1Y3Y5Y10YSince Sep 2010Volatility Sharpe Sortino Max drawdown
OEF12.18%20.45%23.10%14.17%16.44%15.52%16.0%1.021.48-19.8%
VOO13.37%21.07%21.29%12.77%15.32%14.99%14.9%1.001.44-18.7%

Total return with all distributions reinvested on the ex-dividend date (a modeling convention, not the cash-settlement date), split-adjusted, as of September 4, 2026. YTD and 1Y are cumulative; windows of one year or longer are annualized. “Since Sep 2010” measures every fund from September 9, 2010 — the youngest fund's first trading day — so all funds share one comparison window. Volatility is the annualized standard deviation of daily total returns over the trailing 3 years. Sharpe and Sortino divide the annualized return in excess of the risk-free rate by, respectively, that volatility and the downside deviation (both over the trailing 3 years) — higher is better. Max drawdown is the largest peak-to-trough total-return decline over the same window — shallower is better.

Side-by-side snapshot

Side-by-side snapshot. Each row is one metric; each column is one fund.
MetricOEFVOO
Full nameiShares S&P 100 ETFVanguard S&P 500 ETF
IssueriSharesVanguard
Underlying indexS&P 100 IndexS&P 500 Index
Last Close$382.19 as of September 4, 2026$708.01 as of September 4, 2026
Distribution yield0.77%1.11%
Distribution Safety Score™ 96100
Safety-Adjusted Yield 0.74%1.11%
Expense ratio0.20%0.03%
AUM$20.3B$1041B
Distribution frequencyQuarterlyQuarterly
ObjectiveProvide exposure to the fund's underlying index or strategy per issuer materials.Track the performance of the S&P 500 Index, representing 500 of the largest U.S. companies.
Asset classEquityEquity
Inception date10/23/200009/07/2010
Beta1.051.0
Last dividend$0.7312$1.9622
Ex-dividend date06/15/202606/26/2026

Bottom lineChoose OEF if you want broad equity exposure. Choose VOO if you want simple, diversified core exposure in one low-cost fund.

OEF vs VOO: S&P 100 or S&P 500?

OEF is the mega-cap 100. VOO is the 500. Holding both mostly duplicates large-cap US stocks already inside VOO.

OEFVOO
IndexS&P 100S&P 500 Index
Expense ratio0.20%0.03%
Distribution yield0.77%1.11%
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iShares
ETFs466
Total AUM$4642B

ETFs and AUM reflect what Dividend Vision tracks — the issuer's full lineup may be larger.

iShares is one of the largest ETF providers globally, known for offering a broad, diversified lineup of exchange-traded funds across multiple asset classes and investment strategies. The company operates 215 funds spanning 15 distinct families, including popular offerings in dividend income, covered call strategies, bonds, equities, ESG-focused investments, and factor-based approaches, with widely-held tickers like AGG (bond), ACWI (global equity), and AOA (allocation). iShares is characterized by its comprehensive fund ecosystem that serves both core portfolio holdings and specialized investment strategies, making it a prominent player for investors seeking both traditional and alternative income-generating ETF solutions.

See our curated list of related YouTube videos on OEF.

See all iShares ETFs
Vanguard
ETFs116
Total AUM$4650B

ETFs and AUM reflect what Dividend Vision tracks — the issuer's full lineup may be larger.

Vanguard is one of the largest and most established ETF issuers, known for low-cost, broadly diversified fund offerings built on passive indexing principles. Their lineup spans multiple asset classes and strategies, including core equity and bond index funds, dividend-focused portfolios, ESG-screened options, factor-based strategies, sector exposure, target-date retirement funds, and international investments across developed and emerging markets. The platform is characterized by its emphasis on accessibility and cost efficiency across a comprehensive range of fund families, serving both individual investors seeking broad market exposure and those pursuing specific income, sustainability, or thematic objectives.

See our curated list of related YouTube videos on VOO.

See all Vanguard ETFs

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Quick verdict

OEF (iShares S&P 100 ETF) and VOO (Vanguard S&P 500 ETF) are both quarterly-pay dividend ETFs, but they take different approaches.

VOO offers the higher yield at 1.11% vs 0.77% for OEF. A higher yield means more current income per dollar invested, though it may come with different risk characteristics.

VOO is cheaper with an expense ratio of 0.03% compared to 0.20%.

They have different reference exposures: OEF is linked to S&P 100 Index while VOO is linked to S&P 500 Index, which means their performance drivers differ.

VOO is the larger fund by assets ($1041B), which generally means tighter spreads and better liquidity.

Deep dive

Yield & income

On a $10,000 investment, OEF would generate roughly $6.42/month, while VOO would produce $9.25/month, at current distribution rates. Both pay quarterly distributions.

OEF yield0.77%
VOO yield1.11%
Monthly diff on $10K$2.83

Cost & efficiency

Over 10 years on $10,000, OEF would cost approximately $200 in fees vs $30 for VOO (simplified, not compounded). The $170.00 difference may be offset by yield or performance.

OEF ER0.20%
VOO ER0.03%

Strategy & risk

OEF tracks S&P 100 Index with an index approach, while VOO tracks S&P 500 Index with a large cap approach. Beta is 1.05 for OEF and 1.0 for VOO, making VOO the less volatile of the two by this measure.

OEF beta1.05
VOO beta1.0

Fund details

OEF is managed by iShares (launched 10/23/2000) with $20.3B in assets. VOO is managed by Vanguard (launched 09/07/2010) with $1041B in assets.

OEF AUM$20.3B
VOO AUM$1041B
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Frequently asked questions

What is the difference between OEF and VOO?

OEF (iShares S&P 100 ETF) tracks the S&P 100 — mega-caps. VOO (Vanguard S&P 500 ETF) tracks S&P 500 Index. OEF is a concentrated slice of what VOO already holds. Cost is 0.20% versus 0.03%; distributions are 0.77% and 1.11% as of September 2026. Holding both mostly duplicates large-cap US stocks.

What is the current distribution yield for OEF and VOO?

OEF currently distributes 0.77% and VOO 1.11%, based on fund data updated September 2026. Distribution yield moves with both the payout and the share price, so check the as-of date before relying on either figure.

Is OEF or VOO better for dividend income?

It depends on your goals. VOO currently offers the higher distribution yield, which means more income per dollar invested. However, a lower-yield fund may offer better total return or lower volatility. Consider your time horizon and risk tolerance.

Can I hold both OEF and VOO?

Yes — nothing prevents holding both. Whether the combination actually diversifies depends on how much the underlying exposures overlap, which isn't fully measurable from the data on this page; review each security's holdings, sector, and strategy before treating them as complementary.

Is OEF or VOO safer?

By Dividend Vision's Distribution Safety Score — a rules-based 0–100 estimate of how resilient a distribution looks, where higher is safer — VOO scores 100, OEF scores 96, so VOO's payout currently looks the more resilient of the two. No score makes an investment risk-free — treat this as a screening signal, not a guarantee.

Which has lower fees, OEF or VOO?

OEF has an expense ratio of 0.20% while VOO charges 0.03%. Lower fees mean more of your investment returns stay in your pocket over time.

How much income does $10,000 in OEF vs VOO generate?

At current rates, $10,000 in OEF would generate roughly $6.42 per month ($77.00 annually). The same in VOO would produce about $9.25 per month ($111.00 annually).

Which has performed better historically, OEF or VOO?

OEF has lagged VOO over the trailing twelve months, posting a 20.45% total return against 21.07%. The picture flips over 10 years, though — OEF has compounded at 16.44% a year, ahead of VOO at 15.32%. Figures are total returns: price change plus every distribution reinvested. Past performance does not guarantee future results.

More comparisons to explore

OEF vs VOO — at a glance

Generated August 29, 2026.

Overview

OEF and VOO are both large-cap U.S. equity ETFs tracking broad market indexes, but they differ fundamentally in scope. OEF tracks the S&P 100—the 100 largest U.S. companies—while VOO tracks the full S&P 500, capturing the next 400 mid-large companies as well. The result is a meaningful difference in diversification, concentration, and yield despite both funds' index-tracking mandates.

How they differ

OEF's S&P 100 universe is roughly one-fifth the size of VOO's S&P 500, creating significantly higher concentration risk. The funds' top holdings overlap substantially, but OEF excludes the broader mid-large universe that VOO includes, making it a narrower play on mega-cap stocks. VOO offers a lower expense ratio at 0.03% versus OEF's 0.20%—a 17-basis-point drag that compounds over time. OEF's distribution rate stands at 0.77% compared to VOO's 1.11%, reflecting its tighter company universe and potentially higher valuation multiples among the largest 100 firms. VOO is substantially larger, with $1041B in AUM versus OEF's $20.3B, which typically means tighter bid-ask spreads and lower trading friction.

Who each is best for

OEF: Investors seeking concentrated exposure to the U.S. ultra-large-cap segment who believe the 100 largest companies offer sufficient diversification and want to avoid mid-large-cap holdings in the 101–500 range.

VOO: Investors who want broad exposure to large U.S. equities with minimal fees and prefer the diversification of a 500-stock index over a 100-stock one, or who prioritize lower trading costs via higher liquidity.

Key risks to know

  • Concentration and sector tilt: OEF's 100-stock portfolio is materially more concentrated than VOO's 500 stocks. A downturn affecting the largest-cap names will hit OEF harder, and any sector overweight within the top 100 (tech, financials) compounds that risk.
  • Valuation gap: The S&P 100 typically carries higher valuations than the S&P 500 due to its mega-cap tilt. In a multiple-compression environment, OEF may underperform VOO beyond the expense-ratio difference alone.
  • Fee drag over long holding periods: OEF's 17-basis-point expense-ratio disadvantage costs roughly 1.7% of returns per decade before accounting for compounding. For buy-and-hold investors, this friction is material.
  • Liquidity and trading costs: VOO's $1041B AUM versus OEF's $20.3B creates a vast gap in market depth. Traders in OEF may encounter wider bid-ask spreads, especially for large blocks.

Bottom line

If you want the broadest large-cap U.S. equity exposure at the lowest possible cost, VOO's 500-stock mandate and 0.03% expense ratio stand out. If you're specifically seeking concentrated mega-cap upside and accept higher fees and concentration risk as a tradeoff, OEF's narrower focus may fit a tactical sleeve. Past performance does not guarantee future results.

AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.

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