MDYvsIVOOETF Comparison
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The ETFs State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) and Vanguard S&P Mid-Cap 400 ETF (IVOO) 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. MDY is more expensive with a Total Expense Ratio (TER) of 0.23%, versus 0.07% for IVOO. MDY is up 14.43% year-to-date (YTD) with -$990M in YTD flows. IVOO performs better with 14.71% YTD performance, and +$433M in YTD flows. Run a side-by-side ETF comparison of MDY and IVOO 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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MDY vs IVOO performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/08/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | MDY IVOO | -2.81%-2.81% | +1.84%+1.95% | +14.43%+14.71% | +15.21%+15.58% | +51.22%+52.42% | +47.28%+48.77% |
| Flows | MDY IVOO | +$235M+$52M | -$550M+$202M | -$990M+$433M | -$887M+$538M | -$828M+$1.28B | -$1.88B+$1.50B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | MDY IVOO | +13.00%+13.40% | +15.39%+15.35% | +17.78%+17.78% | +19.71%+19.51% |
| Max drawdown | MDY IVOO | -5.17%-5.20% | -8.78%-8.82% | -23.91%-24.02% | -23.91%-24.02% |
| Max drawdown duration | MDY IVOO | 23d23d | 53d53d | 379d379d | 379d379d |
Trading data
MDY | IVOO | |
Last sale 9/9/2026 at 1:30 PM | $679.65 | $126.19 |
| Previous close 09/08/2026 | $686.96 | $127.56 |
| Consolidated volume 09/08/2026 | ||
| 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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MDY | IVOO | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/9/2026 at 1:30 PM
Live
Closed
MDY | IVOO | |
|---|---|---|
| Last price | $679.65 | $126.19 |
| 1D performance | -1.06% | -1.07% |
| AuM | $26.49 B | $3.86 B |
| E/R | 0.23% | 0.07% |
Characteristics
MDY | IVOO | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | State Street Investment Management | Vanguard |
| 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 | May 4, 1995 | September 7, 2010 |
| ESG | No | No |
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Exposure
Countries
MDY
USA
95.79%
Other
4.21%
IVOO
USA
95.8%
Other
4.2%
Sectors
MDY
Finance
23%
Industrials
16.96%
Technology
13.52%
Non-Energy Materi.
10.18%
Healthcare
9.95%
Other
26.4%
IVOO
Finance
23.03%
Industrials
16.99%
Technology
13.5%
Non-Energy Materi.
10.19%
Healthcare
9.96%
Other
26.32%
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Diversification
MDY
Total weight of top 15 holdings out of 15
10.46%
IVOO
Total weight of top 15 holdings out of 15
10.48%
Top 15 holdings
Data as of July 31, 2026
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%
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%
Frequently asked questions about MDY and IVOO
How have the MDY and IVOO ETFs performed in 2026?
As of September 8, 2026, MDY is up 14.43% year-to-date (YTD), while IVOO has returned 14.71%. That puts IVOO better performer ahead so far this year.
Which ETF is attracting more investor money: MDY or IVOO?
Year-to-date, the MDY ETF saw -$990M in flows, compared to +$433M for IVOO.
Which ETF is more volatile: MDY or IVOO?
Over the past year, MDY had a volatility of 15.39%, while IVOO experienced 15.35%.
Which ETF is bigger: MDY or IVOO?
As of September 8, 2026, MDY holds $26.49 B in assets under management (AUM), while IVOO manages $3.86 B.
What sectors do the MDY and IVOO ETFs invest in?
MDY leans toward sectors like Finance, Industrials and Technology. Meanwhile, IVOO focuses on Finance, Industrials and Technology.
What are the top holdings of the MDY ETF and IVOO ETF?
MDY top holdings include Illumina, Inc., Twilio, Inc. and TechnipFMC plc. IVOO holds in its top three: Illumina, Inc., Twilio, Inc. and TechnipFMC plc.
Which ETF is more diversified: MDY or IVOO?
MDY holds 400 securities with 10.46% of its assets in the top 15. IVOO has 400 securities and a top 15 weight of 10.48%.
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