SPY vs VOO ETF Comparison
Compare SPY and VOO across fund costs, diversification, holdings, performance, income, risk and current AlgovestIQ evidence.
What is the main difference between SPY and VOO?
SPY is State Street SPDR S&P 500 ETF, while VOO is Vanguard S&P 500 ETF. SPY is tied to Equity; VOO is tied to Large Cap Equity. VOO is broader by holdings count, with 505 positions versus 504 for SPY. SPY is more concentrated at the top, based on top-10 holdings weight.
| Metric | SPY | VOO | Type |
|---|---|---|---|
| Expense ratio | 0.09% | 0.03% | Fund |
| Holdings | 504 | 505 | Fund |
| Top-10 concentration | 58.1% | 58% | Fund |
| Underlying exposure | Equity | Large Cap Equity | Fund |
| Annualized volatility | 12.8% | 12.8% | Risk |
| Max drawdown | -9.1% | -9.2% | Risk |
| Beta | 1.00 | 1.00 | Risk |
| Sharpe ratio | 1.06 | 1.06 | Risk |
| Sortino ratio | 1.51 | 1.51 | Risk |
| AIQ Score | 62/100 | 60/100 | AlgovestIQ |
| AIQ Edge Score | 9/10 | 8/10 | AlgovestIQ |
| Momentum | 47/100 | 48/100 | AlgovestIQ |
| Risk Resilience | 89/100 | 89/100 | AlgovestIQ |
AlgovestIQ AIQ Comparison
State Street SPDR S&P 500 ETF vs Vanguard S&P 500 ETF
SPY leads
SPY leads by 2 AIQ points, primarily on Quality.
Fragile: 0 of 4 evidence groups support SPY, and its current signal state is conflicted.
State Street SPDR S&P 500 ETF
Vanguard S&P 500 ETF
The Algovestiq AIQ Score currently favors SPY over VOO, 62 versus 60 as of Sep 2, 2026. SPY's advantage is driven primarily by stronger quality. SPY also shows the stronger technical structure relative to its 50-day moving average. 0 of 4 covered evidence groups favor SPY today, and the comparison is rated Fragile on stability: the AIQ gap is narrow at 2 points. SPY lead: Stable — the AIQ differential has held near 2 points over 30 sessions.
Compare State Street SPDR S&P 500 ETF and Vanguard S&P 500 ETF across performance, expense ratio, dividend yield, drawdown, volatility and the Algovestiq AIQ Score.
AIQ Factor Divergence
Where the two separate, on the four dimensions behind the AIQ Score. Bars read outward from a shared zero: further from the centre is a wider gap.
- Quality30%84 vs 78SPY +6
- Value30%39 vs 37Even
- Momentum25%47 vs 48Even
- Risk Resilience15%89 vs 89Even
0 of 4 evidence groups favor SPY. SPY’s edge is concentrated in quality.
What changed since the last close
Latest scored session 2026-09-02, compared against the prior scored session 2026-09-01.
No factor moved materially.
No new signals fired.
No factor moved materially.
No new signals fired.
SPY's lead was unchanged in the latest snapshot.
Deeper signal detail for each name lives on its own signals page — SPY and VOO both carry a full feed there.
Which one fits your objective
The same two names rank differently depending on what you are optimizing for. All six reads are shown at once — none of them is hidden behind a toggle.
Balanced
SPYSPY on the overall AIQ Score, which weights Quality and Value at 30% each.
Growth
EvenGrowth figures are not covered for both names.
Value
EvenThe two are level on Value.
Momentum
EvenThe two are level on Momentum.
Lower downside
EvenDownside measures are level or not covered.
Analyst upside
EvenAnalyst targets are level or not covered for both names.
Fund facts, side by side
Two funds tracking overlapping universes are separated by cost and risk far more than by holdings. Those lead here.
| Measure | SPY | VOO | Why it matters |
|---|---|---|---|
| Expense ratio | 0.09% | 0.03% | Lower is better — it compounds against you every year you hold. |
| Assets under management | $811.9B | $1.70T | Larger funds generally carry tighter spreads. |
| Holdings | 504 | 505 | More holdings means broader diversification, not better returns. |
| Average volume | 73,651,172 | 8,521,334 | Liquidity — matters most if you trade size. |
| Annualized volatility | 12.8% | 12.8% | Lower is a steadier ride for the same exposure. |
| Max drawdown | -9.1% | -9.2% | The worst peak-to-trough loss on record for the fund. |
| Sharpe ratio | 1.06 | 1.06 | Return per unit of risk. Higher is better. |
| Beta | 1.00 | 1.00 | Sensitivity to the broad market. Neither direction is better — it depends on the role in your portfolio. |
Where the exposure actually sits
SPY and VOO share 149.58% of their weighted exposure across 500 common holdings.
SPY is the more concentrated of the two: its ten largest positions are 58.08% of the fund, against 57.99% for VOO (504 holdings vs 505). Concentration cuts both ways — it is what drives outperformance when the top names work, and what makes the drawdown deeper when they do not.
4 holdings are unique to SPY and 5 to VOO. Owning both adds little diversification — they are largely the same exposure in different wrappers.
Largest shared positions
| Holding | SPY | VOO | Shared |
|---|---|---|---|
| AAPLAPPLE INC | 14.06% | 14.1% | 14.06% |
| MSFTMICROSOFT CORP | 11.39% | 10.73% | 10.73% |
| AMZNAMAZON.COM INC | 7.68% | 8.26% | 7.68% |
| NVDANVIDIA CORP | 8.08% | 7.55% | 7.55% |
| GOOGLALPHABET INC CL A | 3.01% | 3.24% | 3.01% |
| MUMICRON TECHNOLOGY INC | 3.27% | 2.88% | 2.88% |
| BRK-BBERKSHIRE HATHAWAY INC CL B | 2.79% | 2.91% | 2.79% |
| LLYELI LILLY + CO | 2.76% | 2.82% | 2.76% |
Shared weight is the lower of the two positions — the portion of capital both funds genuinely have in the same security.
ETF comparison questions
Short answers to the fund-specific questions behind this comparison.
Which ETF is more diversified, SPY or VOO?
VOO currently has more reported holdings, with 505 positions versus 504.
Which has the lower expense ratio?
VOO has the lower reported expense ratio in the current fund profile.
Which ETF has the higher distribution yield?
The current dataset does not show a higher-yield winner.
Which ETF has been more volatile?
SPY has the higher annualized volatility in the current risk snapshot.
Which ETF has had the smaller drawdown?
SPY has the less severe max drawdown in the current risk snapshot.
Which ETF has the stronger current AlgovestIQ evidence?
SPY currently leads on supporting AlgovestIQ evidence, 62 to 60.
AIQ Agreement Matrix
0 of 4 covered evidence groups favor SPY. A wide gap backed by one group is a weaker case than a narrow gap backed by five.
| Evidence group | Favors | Reading |
|---|---|---|
| AIQ Score | Even | 62 vs 60 |
| Fundamentals | Not covered | Not covered |
| Valuation | Even | Value 39 vs 37 |
| Technicals | Even | Price vs 50-day 1.4% vs 1.4%; vs 200-day 7.2% vs 7.2% |
| Risk Resilience | Even | Risk Resilience 89 vs 89 |
| Analyst expectations | Not covered | Not covered |
✓ agrees with the overall verdict · ✕ points the other way. Groups marked “not covered” lack data on one or both of SPY and VOO and are excluded from the count.
AIQ Decision Stability
The conclusion is sensitive to small changes. Treat the lead as provisional and watch the flip conditions below.
- The AIQ gap is narrow at 2 points. (argues the conclusion is provisional)
- Only 0 of 4 covered evidence groups agree. (argues the conclusion is provisional)
- The lead has been steady session to session. (supports the conclusion holding)
- The leader is throwing conflicting signals. (argues the conclusion is provisional)
Stability combines the score gap, how broadly the evidence agrees, how steady the lead has been across daily snapshots, the current signal state on both names, and analyst dispersion on SPY.
How the comparison changed
120 daily snapshots · Apr 21 – Sep 2SPY lead: Stable — the AIQ differential has held near 2 points over 30 sessions.
- Today
- SPY +2
- 62 vs 60
- 7 sessions ago
- SPY +3
- 64 vs 61
- 30 sessions ago
- SPY +2
- 70 vs 68
- 90 sessions ago
- VOO +3
- 58 vs 61
The lead changed hands 10 times in this window, most recently on Aug 1 when SPY moved ahead of VOO.
AIQ Signal Divergence
Only the signals that bear on the head-to-head. A conflicted name is carrying bullish and bearish rules at the same time — the technical evidence is not pointing one way.
4 bullish / 1 bearish / 1 neutral, conflicted
- Golden Cross Active — bullish, trend, long horizon (6.20%)
- EMA Ribbon Expansion Bullish — bullish, trend, medium horizon
- 52-Week High Proximity — bullish, risk, long horizon (1.9%)
4 bullish / 1 bearish / 1 neutral, conflicted
- Golden Cross Active — bullish, trend, long horizon (6.17%)
- EMA Ribbon Expansion Bullish — bullish, trend, medium horizon
- 52-Week High Proximity — bullish, risk, long horizon (1.9%)
SPY leads the comparison while carrying a conflicted signal state, which is one reason the stability rating is not higher.
Price vs model alignment
Whether the latest session's price move confirms what the model did over the same session, or contradicts it.
Neither the price nor the AIQ Score moved enough in the latest session to confirm or contradict the other (price +0.44%, AIQ 0 points).
Neither the price nor the AIQ Score moved enough in the latest session to confirm or contradict the other (price +0.45%, AIQ 0 points).
What would flip this result
A state, not a forecast. These are the specific, observable changes that would reverse the verdict — not a price prediction.
- 1VOO closes the Quality gap — currently 6 points behind, the largest single contributor to SPY's edge.
- 2VOO generates a confirmed bullish trend signal it does not currently carry, such as MACD Bullish Crossover.
- 3SPY's conflicting signal state resolves bearish — it currently carries 4 bullish and 1 bearish rules at once.
- 4A regime shift changes factor weighting — the composite weights Quality and Value at 30% each, so a rotation toward either would move the result most.
The full evidence
Every number behind the verdict. The leader is called above each group so you are not left to solve it from the table.
Technicals
Split| Metric | SPY | VOO |
|---|---|---|
| RSI (14) | 38.4 | 38.1 |
| ADX (14) | 14.2 | 14.1 |
| Price vs 50-day | 1.4% | 1.4% |
| Price vs 200-day | 7.2% | 7.2% |
| Volatility (1M, annualized) | 7.2% | 7.1% |
Risk
Split| Metric | SPY | VOO |
|---|---|---|
| Beta | 1 | 1 |
| Sharpe ratio | 1.06 | 1.06 |
| Sortino ratio | 1.51 | 1.51 |
| Max drawdown | -9.1% | -9.2% |
| Current drawdown | -2.1% | -2% |
| Annualized volatility | 12.8% | 12.8% |
| Value at risk (95%) | -1.4% | -1.4% |
Straight answers
Each answer is regenerated from the current snapshot, not written once and left to age.
Which is better, SPY or VOO?
On the Algovestiq AIQ Score, SPY is the stronger of the two as of Sep 2, 2026, scoring 62 against VOO's 60. The edge comes from quality. This is a systematic score, not a recommendation: it ranks the two on the same evidence, it does not know your holding period or tax position.
Is SPY or VOO the better buy right now?
SPY carries the stronger systematic profile as of Sep 2, 2026, and the comparison is rated Fragile — 0 of 4 covered evidence groups agree. A Fragile rating means the conclusion is sensitive: the AIQ gap is narrow at 2 points. Treat the lead as provisional.
Why does the AIQ Score favor SPY over VOO?
The composite weights Quality at 30%, Value at 30%, Momentum at 25% and Risk Resilience at 15%. SPY leads Quality by 6 points. Where the two split, the factor with the larger weight carries the result.
Which is better value, SPY or VOO?
Neither name separates on the peer-relative Value factor. The two are level on Value. The Value factor reads valuation relative to sector peers and to the company's own fundamental quality, so it is not the same as simply having the lower multiple.
Which has stronger growth, SPY or VOO?
Growth figures are not covered for both names. Growth here is measured on reported revenue and earnings, not on forward estimates — it describes what the businesses have delivered, not what the Street expects next.
Which has stronger momentum, SPY or VOO?
The two are level on Momentum. Momentum carries 25% of the AIQ composite. It has documented persistence over three- to twelve-month horizons, which makes it a timing input rather than a reason to hold something indefinitely.
Which is riskier, SPY or VOO?
The two are close on downside measures. Downside measures are level or not covered. The Risk Resilience factor weights 15% of the composite; position sizing usually responds to it more usefully than the buy/avoid decision does.
Is SPY more profitable than VOO?
Margin data is not comparable for both names in the current snapshot.
Is SPY's lead over VOO getting stronger or weaker?
SPY lead: Stable — the AIQ differential has held near 2 points over 30 sessions. This is measured from 120 daily comparison snapshots between 2026-04-21 and 2026-09-02. The lead has changed hands 10 times in that window, most recently on 2026-08-01, when SPY moved ahead of VOO.
What would change the SPY vs VOO verdict?
The result is a state, not a forecast, so it changes when the underlying evidence changes. Concretely: VOO closes the Quality gap — currently 6 points behind, the largest single contributor to SPY's edge; VOO generates a confirmed bullish trend signal it does not currently carry, such as MACD Bullish Crossover; SPY's conflicting signal state resolves bearish — it currently carries 4 bullish and 1 bearish rules at once; a regime shift changes factor weighting — the composite weights Quality and Value at 30% each, so a rotation toward either would move the result most.
What do the current signals say about SPY and VOO?
SPY: 4 bullish / 1 bearish / 1 neutral, conflicted. VOO: 4 bullish / 1 bearish / 1 neutral, conflicted. A conflicted state means bullish and bearish rules are active on the same name at once — the technical evidence is not pointing one way, and a decision taken on it carries more timing risk. The most decision-relevant rule on SPY is Golden Cross Active (bullish, long horizon). On VOO it is Golden Cross Active (bullish, long horizon).
Compare SPY and VOO with others
How this comparison is scored
The Algovestiq AIQ Score composites four factors — Quality (30%), Value (30%), Momentum (25%) and Risk (15%). Sentiment is reported separately as SentimentPulse and is not folded into the composite. Scores refresh every trading day, and this page regenerates from the latest snapshot rather than being written once.
The verdict names a leader, states how broadly six independent evidence groups agree, and rates how durable that conclusion is given the score gap, its recent trajectory and the current signal state on both names.
How to use side-by-side comparison →This comparison is informational and educational, not investment advice. AIQ scores update daily; re-check after earnings, guidance or macro data that materially changes either name’s factor profile.