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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.

Updated October 16, 2026

How these figures are calculated: methodology.

Best for

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

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Visual comparison

Key metrics

Projected income on $10K

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

Total returns

100% reinvested · ex-date convention. Period returns use this fixed assumption, independent of chart settings. YTD and 1Y are cumulative period returns; 3Y, 5Y, and 10Y are annualized. The shared Since-start window is annualized only when it covers at least one year.

OEF has lagged VOO over the trailing twelve months, posting a 16.00% total return against 16.84%. The picture flips over 10 years, though — OEF has compounded at 16.60% a year, ahead of VOO at 15.49%. 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.
SymbolYTD cumulative1Y cumulative3Y annualized5Y annualized10Y annualizedSince Sep 2010Volatility Sharpe Sortino Max drawdown
OEF11.61%16.00%23.95%14.43%16.60%15.37%16.0%1.091.59-19.8%
VOO12.85%16.84%22.07%12.91%15.49%14.83%14.8%1.071.55-18.7%

Total return with all distributions reinvested on the ex-dividend date (a modeling convention, not the cash-settlement date), split-adjusted, as of October 16, 2026. YTD and 1Y are cumulative period returns; 3Y, 5Y, and 10Y are annualized. The shared Since-start window is annualized only when it covers at least one year. “Since Sep 2010” measures every fund from September 9, 2010 — the start of shared available history — 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$380.18 as of October 16, 2026$701.61 as of October 16, 2026
Distribution rate0.80%1.04%
Trailing 12-month yield0.86%1.06%
Distribution Safety Score™ 9297
Safety-Adjusted Yield 0.74%1.01%
Expense ratio0.20%0.03%
AUM$20.8B$1.04T
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$0.76284$1.8226
Ex-dividend date09/15/202609/28/2026

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 rate0.80%1.04%
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iShares
ETFs467
Total AUM$4.64T

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

iShares, operated by BlackRock, is one of the largest and most established ETF providers globally, known for offering broad, liquid index-tracking funds across nearly all asset classes and investment styles. The lineup encompasses a comprehensive range of strategies including core equity and bond exposure, dividend and income-focused funds, covered call strategies, ESG and thematic investments, factor-based approaches, alternatives, commodities, and municipal bonds, serving both individual and institutional investors. With numerous popular ticker symbols and extensive diversification across geographies, sectors, and investment objectives, iShares provides one of the market's widest selections of ETFs for building diversified portfolios.

See our curated list of related YouTube videos on OEF.

See all ETFs from iShares
Vanguard
ETFs116
Total AUM$4.66T

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 ETFs from Vanguard

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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 1.04% vs 0.80% 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 ($1.04T), but assets alone do not establish trading costs or liquidity.

Deep dive

Yield & income

On a $10,000 investment, OEF would generate roughly $20.00 cash per distribution, while VOO would produce $26.00 cash per distribution, at current distribution rates. Both pay quarterly distributions.

OEF yield0.80%
VOO yield1.04%
Cash diff on $10K$6.00

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 $20.8B in assets. VOO is managed by Vanguard (launched 09/07/2010) with $1.04T in assets.

OEF AUM$20.8B
VOO AUM$1.04T
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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 0.80% and 1.04% as of October 2026. Holding both mostly duplicates large-cap US stocks.

What is the current distribution rate for OEF and VOO?

OEF currently distributes 0.80% and VOO 1.04%, based on fund data updated October 2026. Distribution rate 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 97, OEF scores 92, 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 $20.00 cash per distribution ($80.00 annually). The same in VOO would produce about $26.00 cash per distribution ($104.00 annually).

Which has performed better historically, OEF or VOO?

OEF has lagged VOO over the trailing twelve months, posting a 16.00% total return against 16.84%. The picture flips over 10 years, though — OEF has compounded at 16.60% a year, ahead of VOO at 15.49%. 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 October 17, 2026.

Overview

OEF and VOO are both broad U.S. equity ETFs tracking large-cap indexes, but they differ in scope and underlying holdings. firms. This structural difference means OEF is more concentrated, whereas VOO offers wider diversification across the large-cap universe.

How they differ

The most significant distinction is breadth: OEF holds 100 stocks versus VOO's 500, making OEF substantially more concentrated.

On fees, VOO is dramatically cheaper, with an expense ratio of 0.03% versus OEF's 0.20%—a difference of 0.17% percentage points. VOO also dwarfs OEF in asset base: VOO holds $1045B compared to OEF's $20.8B, a roughly 50-fold difference in capital managed. OEF's beta of 1.05 slightly exceeds VOO's 1.0, suggesting marginally higher volatility relative to the broader market.

Who each is best for

  • OEF: Fits investors drawn to concentrated exposure to America's largest 100 companies and willing to accept higher costs and tighter holdings for that specificity. Works as a satellite position within a broader equity allocation.
  • VOO: Designed for investors seeking low-cost, highly liquid core large-cap exposure with minimal drag from fees. Suits those prioritizing simplicity and broad diversification across 500 names rather than the top tier alone.

Key risks to know

  • Concentration risk in OEF: With only 100 holdings versus 500, OEF's portfolio is materially more concentrated. Sector or company-level shocks that spare the S&P 500 overall may weigh more heavily on OEF returns.
  • Dividend timing and composition: OEF's lower distribution rate (0.80%) versus VOO's (1.04%) reflects differences in which stocks dominate each index, not superior underlying valuation. Shifts in mega-cap dividend policy could narrow or widen this gap unexpectedly.
  • Fee drag compounding: Over 20-30 year horizons, OEF's 0.20% fee versus VOO's 0.03% compounds into a material performance drag even if index returns are identical, likely eroding 0.5–1.0% of cumulative wealth.
  • Beta and tracking: OEF's 1.05 beta suggests slightly amplified moves relative to the market; investors should verify this behavior during sharp downturns or rallies in the S&P 100 versus broader indexes.

Bottom line

If you want maximum diversification and lowest cost within large-cap U.S. equity, VOO's $1045B asset base, 0.03% fee, and 500-stock breadth create a compelling core holding. If you specifically want concentrated exposure to just the largest 100 names and accept higher fees to get it, OEF fills that niche. 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.

Learn the method

The metrics behind this comparison, explained in the Academy.

How to read a fund's stats How expense ratios eat returns Correlation between two funds

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These comparisons follow the Dividend Vision methodology.