IVOOvsMDYETF Comparison
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The ETFs Vanguard S&P Mid-Cap 400 ETF (IVOO) and State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) track the S&P MidCap 400 Total Return Index - USD and belong to the same industry segment: US Mid Cap. Both ETFs have the same top 3 sector exposures: Finance, Industrials and Technology. IVOO is less expensive with a Total Expense Ratio (TER) of 0.07%, versus 0.23% for MDY. IVOO is up 11.8% year-to-date (YTD) with +$537M in YTD flows. MDY performs worse with 11.54% YTD performance, and -$1.16B in YTD flows. Run a side-by-side ETF comparison of IVOO and MDY below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
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IVOO vs MDY performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/17/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | IVOO MDY | -6.42%-6.39% | -2.00%-2.08% | +11.80%+11.54% | +13.59%+13.25% | +49.05%+47.90% | +47.09%+45.65% |
| Flows | IVOO MDY | +$148M-$2M | +$294M-$709M | +$537M-$1.16B | +$641M-$1.52B | +$1.34B-$1.21B | +$1.56B-$1.88B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | IVOO MDY | +12.26%+11.87% | +15.35%+15.39% | +17.78%+17.78% | +19.51%+19.72% |
| Max drawdown | IVOO MDY | -7.18%-7.14% | -8.82%-8.78% | -24.02%-23.91% | -24.02%-23.91% |
| Max drawdown duration | IVOO MDY | 32d32d | 53d53d | 379d379d | 379d379d |
Trading data
IVOO | MDY | |
Last sale 9/18/2026 at 6:25 PM | $123.70 | $665.36 |
| Previous close 09/17/2026 | $124.30 | $669.43 |
| Consolidated volume 09/17/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of August 31, 2026
1-year trailing difference
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IVOO | MDY | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/18/2026 at 6:25 PM
Live
Closed
IVOO | MDY | |
|---|---|---|
| Last price | $123.70 | $665.36 |
| 1D performance | -0.48% | -0.61% |
| AuM | $3.86 B | $25.65 B |
| E/R | 0.07% | 0.23% |
Characteristics
IVOO | MDY | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | Vanguard | State Street Investment Management |
| Benchmark | S&P MidCap 400 Index | S&P MidCap 400 Index |
| N° of holdings | 400 | 400 |
| Asset class | Equities | Equities |
| Trailing 12m distribution yield | Join | Join |
| Inception date | September 7, 2010 | May 4, 1995 |
| ESG | No | No |
Exposure
Countries
IVOO
USA
95.8%
Other
4.2%
MDY
USA
95.79%
Other
4.21%
Sectors
IVOO
Finance
23.03%
Industrials
16.99%
Technology
13.5%
Non-Energy Materi.
10.19%
Healthcare
9.96%
Other
26.32%
MDY
Finance
23%
Industrials
16.96%
Technology
13.52%
Non-Energy Materi.
10.18%
Healthcare
9.95%
Other
26.4%
Diversification
IVOO
Total weight of top 15 holdings out of 15
10.48%
MDY
Total weight of top 15 holdings out of 15
10.46%
Top 15 holdings
Data as of July 31, 2026
IVOO
Illumina, Inc.
0.87%
Twilio, Inc.
0.84%
TechnipFMC plc
0.80%
Curtiss-Wright Corp.
0.75%
Carpenter Technology Corp.
0.72%
ATI, Inc.
0.71%
nVent Electric Plc
0.70%
Everpure, Inc.
0.68%
Okta, Inc.
0.67%
XPO, Inc.
0.66%
Burlington Stores, Inc.
0.65%
US Foods Holding Corp.
0.62%
United Therapeutics Corp.
0.61%
Tenet Healthcare Corp.
0.61%
Woodward, Inc.
0.60%
MDY
Illumina, Inc.
0.87%
Twilio, Inc.
0.84%
TechnipFMC plc
0.80%
Curtiss-Wright Corp.
0.75%
Carpenter Technology Corp.
0.72%
ATI, Inc.
0.71%
nVent Electric Plc
0.69%
Everpure, Inc.
0.68%
Okta, Inc.
0.66%
XPO, Inc.
0.66%
Burlington Stores, Inc.
0.65%
US Foods Holding Corp.
0.62%
United Therapeutics Corp.
0.61%
Tenet Healthcare Corp.
0.61%
Woodward, Inc.
0.60%
Frequently asked questions about IVOO and MDY
How have the IVOO and MDY ETFs performed in 2026?
As of September 17, 2026, IVOO is up 11.8% year-to-date (YTD), while MDY has returned 11.54%. That puts IVOO better performer ahead so far this year.
Which ETF is attracting more investor money: IVOO or MDY?
Year-to-date, the IVOO ETF saw +$537M in flows, compared to -$1.16B for MDY.
Which ETF is more volatile: IVOO or MDY?
Over the past year, IVOO had a volatility of 15.35%, while MDY experienced 15.39%.
Which ETF is bigger: IVOO or MDY?
As of September 17, 2026, IVOO holds $3.86 B in assets under management (AUM), while MDY manages $25.65 B.
What sectors do the IVOO and MDY ETFs invest in?
IVOO leans toward sectors like Finance, Industrials and Technology. Meanwhile, MDY focuses on Finance, Industrials and Technology.
What are the top holdings of the IVOO ETF and MDY ETF?
IVOO top holdings include Illumina, Inc., Twilio, Inc. and TechnipFMC plc. MDY holds in its top three: Illumina, Inc., Twilio, Inc. and TechnipFMC plc.
Which ETF is more diversified: IVOO or MDY?
IVOO holds 400 securities with 10.48% of its assets in the top 15. MDY has 400 securities and a top 15 weight of 10.46%.
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