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Data as of Oct 28, 2026.

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ACWI vs MDY: Differences, Returns & Fees

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Over the year to Oct 28, 2026, ACWI returned +13.4% to MDY's +12.8%; 1% of their weight is in the same names.

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Net assets: $33.0bn on Oct 28, 2026 for iShares MSCI ACWI ETF, and $25.9bn on Oct 27, 2026 for SPDR S&P MidCap 400 ETF Trust.

ACWI on its own →MDY on its own →
At a glance
+13.4%
ACWI total return, 1 year
+12.8%
MDY total return, 1 year
0.32%
ACWI expense ratio
0.23%
MDY expense ratio

Pair scorecard

MDY costs 0.09 points a year less; their one-year returns differ by 0.6 points; ACWI is 1.3 times larger.

ACWI vs MDY: Differences, Returns & Fees
MeasureACWIMDY
Return
Total return, 1 year+13.4%+12.8%
Drawdown
Below its high6.5%, high on Aug 14, 2026
Benchmark
What it tracksMSCI ACWIS&P MidCap 400 Index
Cost and size
Expense ratio0.32%0.23%
Net assets, as of Oct 26, 2026$32.6bn$25.8bn
Holdings
Holdings in common1%
Top ten holdings, share of the fund24.9%7.5%

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

What they share

1%

By the books each fund has filed, ACWI and MDY hold 1% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.

0 half 100%

half

1% in common

Positions both hold · largest shared weight first ACWI MDY
ALLIANZ 0.18% 0.22%
COMPAGNIE FINANCIERE RICHEMONT SA 0.10% 0.28%
CSL 0.07% 0.40%
ANGLO AMERICAN PLC 0.05% 0.24%
OKTA CLASS A 0.04% 1.09%
ASSICURAZIONI GENERALI 0.03% 0.18%
ORANGE SA 0.03% 0.16%
TECHNIPFMC PLC 0.03% 0.81%
ATI 0.02% 0.66%
CURTISS WRIGHT 0.02% 0.51%
ENTEGRIS INC 0.02% 0.66%
MTN GROUP 0.02% 0.16%
Only in one fund ↓
Only in ACWI
APPLE 4.97%
NVIDIA 4.89%
MICROSOFT 3.66%
AMAZON.COM INC 2.39%
ALPHABET CLASS A 1.83%
TAIWAN SEMICONDUCTOR MANUFACTURING 1.77%
BROADCOM INC 1.51%
ALPHABET CLASS C 1.44%
Only in MDY
U.S. Dollar 0.96%
US Foods Holding Corp. 0.64%
Permian Resources Corporation Class A 0.62%
Tenet Healthcare Corporation 0.61%
Roku Inc. Class A 0.60%
TD SYNNEX Corporation 0.59%
Royal Gold Inc. 0.59%
Nutanix Inc. Class A 0.57%
Check overlap with more funds →

Side by side

ACWI iShares MSCI ACWI 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 MSCI ACWI Tracks the S&P MidCap 400
Total return, 1 year +13.4% +12.8%
Its benchmark over the same days not measured +13.2% (IJH)
Gap to its benchmark not measured −0.4 pts vs IJH
Expense ratio 0.32% 0.23%
Already in the S&P 500 60.9% 0.0%
Holdings 2197 401
Net assets, ACWI as of Oct 28, 2026 and MDY as of Oct 27, 2026 $33.0bn $25.9bn

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

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About each fund
ACWI

ACWI tracks the MSCI ACWI. Over the year to Oct 28, 2026 it returned +13.4% with distributions reinvested. The prospectus expense ratio is 0.32% a year. By its holdings published by its issuer for Oct 27, 2026, 61% of the fund by weight is stocks the S&P 500 also holds, across 2,197 positions, with the top ten at 24.9%.

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, ACWI or MDY?
In the year to Oct 28, 2026, with distributions reinvested, ACWI returned +13.4% and MDY +12.8%.
Which is cheaper, ACWI or MDY?
MDY is cheaper, by 0.09 percentage points a year. That is about $9 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do ACWI and MDY overlap with the S&P 500?
By their latest filed holdings, 61% of ACWI and 0% of MDY by weight is stocks the S&P 500 already holds.
Other comparisons
ACWI vs VOACWI vs IJHACWI vs VXFACWI vs MOATMDY vs VTMDY vs URTHIDEV vs MDYMDY vs VGK
Where to next
ACWI on its own →MDY on its own →Hold both: look the portfolio through →Rankings →ACWI dividend history →ACWI holdings →MDY dividend history →MDY holdings →Standards and sources →
Sources and dates
ACWI filings on SEC EDGAR ↗
ACWI prospectus with the expense ratio (SEC) ↗
iShares page for ACWI ↗
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, ACWI against MDY, data as of Oct 28, 2026. https://etfiq.com/compare/any/acwi-vs-mdy

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