Data as of Oct 28, 2026.
MDY vs SPY: Differences, Returns & Fees
Over the year to Oct 28, 2026, MDY returned +12.8% to SPY's +13.6%; 0% of their weight is in the same names.
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Net assets on Oct 27, 2026: $25.9bn for SPDR S&P MidCap 400 ETF Trust and $814.8bn for SPDR S&P 500 ETF Trust.
Pair scorecard
SPY costs 0.14 points a year less; their one-year returns differ by 0.8 points; SPY is far larger, $814.8bn against $25.9bn.
| Measure | MDY | SPY |
|---|---|---|
| Return | ||
| Total return, 1 year | +12.8% | +13.6% |
| Drawdown | ||
| Below its high | 6.5%, high on Aug 14, 2026 | |
| Benchmark | ||
| What it tracks | S&P MidCap 400 Index | S&P 500 Index |
| Cost and size | ||
| Expense ratio | 0.23% | 0.09% |
| Net assets, as of Oct 27, 2026 | $25.9bn | $814.8bn |
| Holdings | ||
| Holdings in common | 0% | |
| Top ten holdings, share of the fund | 7.5% | 38.1% |
Holdings in common uses holdings dated Oct 27, 2026. Method
Risk and return
May 12, 1995 to Oct 23, 2026 · 1,641 weekly returnsEach against its own benchmark: MDY against IJH, Jun 2, 2000 to Oct 23, 2026; SPY against VOO, Sep 17, 2010 to Oct 23, 2026.
MDY returned slightly more: +2,609.3% to +2,389.6%. SPY swung less: 17.4% to 20.2%. MDY and SPY fell about the same at their worst: −54.9% and −54.6%.
Full scorecard
19 measures, with how each is measured Open ↓
| Measure | MDY | SPY | Edge | How it is measured |
|---|---|---|---|---|
| Return | ||||
| Total return | +2,609.3% | +2,389.6% | MDY (slight) | Price change plus distributions, reinvested. |
| Annualized | +11.0% | +10.7% | MDY (slight) | Total return as a yearly rate. |
| Price return | +1,645.2% | +1,340.7% | MDY | Price change alone, distributions left out. |
| Risk | ||||
| Volatility | 20.2% | 17.4% | SPY | Spread of weekly returns, annualized. Lower is steadier. |
| Downside deviation | 14.1% | 12.2% | SPY | Like volatility, counting only weeks below the Treasury bill rate. |
| Max drawdown | −54.9% | −54.6% | Tie | Deepest fall from a high to the low after it. |
| Upside capture | 99.9% | 99.8% | Share of its benchmark's rise caught in the weeks it rose. | |
| Downside capture | 100.2% | 100.0% | Share of its benchmark's fall taken in the weeks it fell. Lower is better. | |
| Beta | 1.00 | 1.00 | Not an edge | How far it moves for each 1% its benchmark moves. |
| R squared | 0.99 | 1.00 | Not an edge | Share of its weekly moves its benchmark explains. |
| Risk-adjusted | ||||
| Sharpe | 0.53 | 0.57 | SPY (slight) | Return above Treasury bills per unit of volatility. |
| Sortino | 0.76 | 0.82 | SPY (slight) | Return above Treasury bills per unit of downside deviation. |
| Treynor | 0.089 | 0.133 | Return above Treasury bills per unit of beta. | |
| Calmar | 0.20 | 0.20 | MDY (slight) | Annualized return divided by the max drawdown. |
| Against the benchmark | ||||
| Benchmark | IJH | VOO | The ETF each fund is measured against. | |
| Alpha | −0.2% a year | −0.1% a year | Not significant | Yearly return beyond what its beta to the benchmark predicts. |
| Alpha t-stat | −0.63 | −0.51 | Not an edge | How sure the alpha is. Below 2, it could be chance. |
| Alpha range | −0.8% to +0.4% | −0.3% to +0.1% | Includes zero | The 95% range for the yearly alpha. |
| Information ratio | −0.11 | −0.15 | Return against its benchmark per unit of tracking error. | |
| Tracking error | 1.7% | 0.4% | Not an edge | How far weekly returns stray from the benchmark, annualized. |
Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 1,641 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, MDY and SPY hold 0% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.
half
0% in common
Only in one fund ↓
Side by side
MDY and SPY on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
MDY and SPY do different jobs. What does each one do in a portfolio?
- What each follows. MDY follows S&P MidCap 400 Index and SPY follows S&P 500 Index.
- Holdings in common. 0% of the weight is in the same securities (holdings dated Oct 27, 2026).
- Cost. MDY charges 0.23% of assets a year and SPY 0.09%, a gap of 0.14 points.
Data as of Oct 28, 2026.
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MDY
MDY tracks the S&P MidCap 400. Over the year to Oct 28, 2026 it returned +12.8% with distributions reinvested, against +13.2% for its benchmark, the S&P MidCap 400 Index. The prospectus expense ratio is 0.23% a year. By its holdings published by its issuer for Oct 27, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 401 positions, with the top ten at 7.5%. It sat 6.5% below its high of Aug 14, 2026 on Oct 28, 2026.
SPY
SPY tracks the S&P 500. Over the year to Oct 28, 2026 it returned +13.6% with distributions reinvested, against +13.7% for its benchmark, the S&P 500 Index. The prospectus expense ratio is 0.09% a year. By its holdings published by its issuer for Oct 27, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 504 positions, with the top ten at 38.1%.
Questions people ask
- Which returned more over the last year, MDY or SPY?
- In the year to Oct 28, 2026, with distributions reinvested, MDY returned +12.8% and SPY +13.6%.
- Which is cheaper, MDY or SPY?
- SPY is cheaper, by 0.14 percentage points a year. That is about $14 on $10,000 held for a year. Fees come from each fund's prospectus.
Links are sources, not endorsements. A comparison is not a recommendation.
How this is computed
Overlap adds up the smaller of the two weights for each security both funds hold.
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ETFIQ, MDY against SPY, data as of Oct 28, 2026. https://etfiq.com/compare/any/mdy-vs-spy
ETFIQ. (Oct 28, 2026). MDY against SPY. Retrieved from https://etfiq.com/compare/any/mdy-vs-spy
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