MDY vs IVOO Stock Comparison: AI Score, Valuation, Performance and Upside
MDY and IVOO both target mid-cap blend exposure but take different paths to get there — MDY via the S&P MidCap 400 Index, and IVOO via the S&P MidCap 400 Index. The practical differences come down to issuer, cost structure, and the specific index rules each fund follows, since both are pursuing a similar investment outcome.
MDY vs IVOO is largely a question of which issuer and index methodology you trust more for mid-cap blend exposure — the underlying investment case is similar, so cost, liquidity, and tracking precision tend to be the deciding factors.
IVOO holds the edge across 3 of 5 key metrics in this comparison. IVOO has delivered stronger 1-year price return (+14.27% vs +13.96% for MDY).
- want the original, most liquid mid-cap benchmark fund
- prefer State Street's approach and fund lineup
- value deepest liquidity and options market among mid-cap ETFs
- are comfortable with higher expense ratio than newer mid-cap trackers
- want the low-cost alternative to the original mid-cap 400 ETF
- prefer Vanguard's approach and fund lineup
- value much lower expense ratio than the original MDY
- are comfortable with smaller trading volume and thinner options market than MDY
| Metric | MDY | IVOO |
|---|---|---|
| ETF scorei | 68.0 | 70.0 |
| Latest closei | $665.87 | $123.52 |
| 1M returni | -4.43% | -4.46% |
| 6M returni | +10.82% | +11.00% |
| 1Y returni | +13.96% | +14.27% |
The ETF score weights long-term returns and risk-adjusted performance most heavily, but still rewards low expense ratios, larger fund size, and broader diversification — so it can favor low-cost, broad, mega-cap funds over smaller thematic or actively-managed funds even when the latter have delivered stronger returns.
How much would $10,000 be worth today if invested at the start of each period, with all dividends reinvested?
| Period | MDY | IVOO |
|---|---|---|
| 1Y ago | $11.52K (+15.2%) started 2025-09-25 | $11.57K (+15.7%) started 2025-09-25 |
| 5Y ago | $15.21K (+52.1%) started 2021-09-27 | $15.62K (+56.2%) started 2021-09-27 |
| 10Y ago | $30.62K (+206.2%) started 2016-09-26 | $31.92K (+219.2%) started 2016-09-26 |
Hypothetical — past performance does not guarantee future results.
| Metric | MDY | IVOO |
|---|---|---|
| Expense ratioi | 0.23% | 0.07% |
| Total assets (AUM)i | $26.25B | $5.87B |
| Dividend yieldi | 1.02% | 1.18% |
| Trailing P/Ei | 20.14 | 20.09 |
| Betai | 1.03 | 1.04 |
| 52-week change | 13.96% | 14.27% |
| Metric | MDY | IVOO |
|---|---|---|
| 1Y returni | +13.96% | +14.27% |
| 6M returni | +10.82% | +11.00% |
| 1M returni | -4.43% | -4.46% |
| 1Y Sharpe ratio | 0.64 | 0.66 |
| Betai | 1.03 | 1.04 |
| Dividend yieldi | 1.02% | 1.18% |
| 5Y CAGR | +7.39% | +7.66% |
Over the past year, MDY and IVOO have moved strongly in the same direction (correlation of 1.00), based on daily returns.
Lower drawdown and smaller single-period drops generally indicate a smoother ride, though they do not guarantee lower future risk.
| Period | Metric | MDY | IVOO |
|---|---|---|---|
| 1Y | Growthi | +13.96% | +14.27% |
| CAGRi | +13.97% | +14.28% | |
| Volatilityi | 15.27% | 15.32% | |
| Sharpe ratioi | 0.64 | 0.66 | |
| Sortino ratioi | 0.94 | 0.97 | |
| Max drawdowni | 8.82% | 8.81% | |
| Current drawdowni | 6.90% | 6.90% | |
| Avg drawdowni | 1.99% | 1.99% | |
| Ulcer Indexi | 2.89% | 2.89% | |
| Max daily dropi | 2.80% | 2.86% | |
| Max wkly dropi | 4.56% | 4.54% | |
| 5Y | Growthi | +42.75% | +44.56% |
| CAGRi | +7.39% | +7.66% | |
| Volatilityi | 19.65% | 19.62% | |
| Sharpe ratioi | 0.23 | 0.25 | |
| Sortino ratioi | 0.33 | 0.35 | |
| Max drawdowni | 24.03% | 24.08% | |
| Current drawdowni | 6.90% | 6.90% | |
| Avg drawdowni | 7.09% | 7.00% | |
| Ulcer Indexi | 9.17% | 9.08% | |
| Max daily dropi | 6.67% | 6.72% | |
| Max wkly dropi | 12.71% | 12.77% | |
| 10Y | Growthi | +168.60% | +174.46% |
| CAGRi | +10.39% | +10.63% | |
| Volatilityi | 21.13% | 21.14% | |
| Sharpe ratioi | 0.36 | 0.37 | |
| Sortino ratioi | 0.50 | 0.52 | |
| Max drawdowni | 42.22% | 42.33% | |
| Current drawdowni | 6.90% | 6.90% | |
| Avg drawdowni | 5.97% | 5.91% | |
| Ulcer Indexi | 8.62% | 8.57% | |
| Max daily dropi | 13.65% | 14.45% | |
| Max wkly dropi | 22.69% | 22.37% |
| Category | MDY | IVOO |
|---|---|---|
| Fund name | State Street SPDR S&P MIDCAP 400 ETF Trust | Vanguard S&P Mid-Cap 400 Index Fund ETF Shares |
| Type | ETF | ETF |
| Expense ratioi | 0.23% | 0.07% |
| Total assets (AUM)i | $26.25B | $5.87B |
| Dividend yieldi | 1.02% | 1.18% |
- Deepest liquidity and options market among mid-cap ETFs
- S&P 400's profitability screen filters out weaker companies
- Long, established track record since 1995
- Much lower expense ratio than the original MDY
- Same profitability-screened S&P MidCap 400 exposure
- Vanguard's index-tracking efficiency
- Higher expense ratio than newer mid-cap trackers
- Mid-caps carry more volatility than large-cap blends
- Unit investment trust structure limits securities-lending revenue
- Smaller trading volume and thinner options market than MDY
- Mid-cap volatility is inherent to the category, not fund-specific
- Newer fund with a shorter live track record
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