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Data as of Oct 28, 2026.

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Across categories

IWB vs MDY: Differences, Returns & Fees

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Over the year to Oct 28, 2026, IWB returned +13.1% to MDY's +12.8%; 4% of their weight is in the same names.

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Net assets: $49.1bn on Oct 28, 2026 for iShares Russell 1000 ETF, and $25.9bn on Oct 27, 2026 for SPDR S&P MidCap 400 ETF Trust.

IWB on its own →MDY on its own →
At a glance
+13.1%
IWB total return, 1 year
+12.8%
MDY total return, 1 year
0.15%
IWB expense ratio
0.23%
MDY expense ratio

Pair scorecard

IWB costs 0.08 points a year less; their one-year returns differ by 0.3 points; IWB is 1.9 times larger.

IWB vs MDY: Differences, Returns & Fees
MeasureIWBMDY
Return
Total return, 1 year+13.1%+12.8%
Drawdown
Below its high6.5%, high on Aug 14, 2026
Benchmark
What it tracksRussell 1000 IndexS&P MidCap 400 Index
Cost and size
Expense ratio0.15%0.23%
Net assets, as of Oct 26, 2026$48.7bn$25.8bn
Holdings
Holdings in common4%
Top ten holdings, share of the fund35.3%7.5%

Holdings in common uses holdings dated Oct 27, 2026. Method

What they share

4%

By the books each fund has filed, IWB and MDY hold 4% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.

0 half 100%

half

4% in common

Positions both hold · largest shared weight first IWB MDY
OKTA CLASS A 0.05% 1.09%
TECHNIPFMC PLC 0.04% 0.81%
ATI 0.03% 0.66%
DYNATRACE INC 0.03% 0.53%
EAST WEST BANCORP 0.03% 0.52%
ENTEGRIS INC 0.03% 0.66%
NUTANIX CLASS A 0.03% 0.57%
NVENT ELECTRIC PLC 0.03% 0.63%
OVINTIV 0.03% 0.57%
PERMIAN RESOURCES CLASS A 0.03% 0.62%
RELIANCE STEEL & ALUMINUM 0.03% 0.64%
ROIVANT SCIENCES LTD 0.03% 0.57%
Only in one fund ↓
Only in IWB
NVIDIA 7.15%
APPLE 7.06%
MICROSOFT 5.56%
AMAZON.COM INC 3.46%
ALPHABET CLASS A 2.63%
BROADCOM INC 2.24%
ALPHABET CLASS C 2.12%
META PLATFORMS CLASS A 1.92%
Only in MDY
U.S. Dollar 0.96%
Moog Inc. Class A 0.29%
BrightSpring Health Services Inc. 0.29%
UMB Financial Corporation 0.28%
Cytokinetics Incorporated 0.25%
CareTrust REIT Inc. 0.25%
Krystal Biotech Inc. 0.25%
InterDigital Inc. 0.25%
Check overlap with more funds →

Side by side

IWB iShares Russell 1000 ETF MDY SPDR S&P MidCap 400 ETF Trust
Where it sits Stock ETF Stock ETF
Issuer iShares State Street
What it is Tracks the Russell 1000 Tracks the S&P MidCap 400
Total return, 1 year +13.1% +12.8%
Its benchmark over the same days +13.2% (VONE) +13.2% (IJH)
Gap to its benchmark −0.1 pts vs VONE −0.4 pts vs IJH
Expense ratio 0.15% 0.23%
Already in the S&P 500 91.7% 0.0%
Holdings 1025 401
Net assets, IWB as of Oct 28, 2026 and MDY as of Oct 27, 2026 $49.1bn $25.9bn

IWB and MDY on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.

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About each fund
IWB

IWB tracks the Russell 1000. Over the year to Oct 28, 2026 it returned +13.1% with distributions reinvested, against +13.2% for its benchmark, the Russell 1000 Index. The prospectus expense ratio is 0.15% a year. By its holdings published by its issuer for Oct 27, 2026, 92% of the fund by weight is stocks the S&P 500 also holds, across 1,025 positions, with the top ten at 35.3%.

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.

Questions people ask

Which returned more over the last year, IWB or MDY?
In the year to Oct 28, 2026, with distributions reinvested, IWB returned +13.1% and MDY +12.8%.
Which is cheaper, IWB or MDY?
IWB is cheaper, by 0.08 percentage points a year. That is about $8 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do IWB and MDY overlap with the S&P 500?
By their latest filed holdings, 92% of IWB and 0% of MDY by weight is stocks the S&P 500 already holds.
Other comparisons
FTGS vs IWBIWB vs VXFIWB vs VOIWB vs MOATMDY vs USMVMDY vs SPMOMDY vs QUALMDY vs SCHB
Where to next
IWB on its own →MDY on its own →Hold both: look the portfolio through →Rankings →IWB dividend history →IWB holdings →MDY dividend history →MDY holdings →Standards and sources →
Sources and dates
IWB filings on SEC EDGAR ↗
IWB prospectus with the expense ratio (SEC) ↗
iShares page for IWB ↗
MDY filings on SEC EDGAR ↗
State Street website ↗

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, IWB against MDY, data as of Oct 28, 2026. https://etfiq.com/compare/any/iwb-vs-mdy

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Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.