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IWB vs MGC: Differences, Returns & Fees

IWB and MGC hold 78% of their weight in the same names, and MGC returned +18.0% over the year. Net assets: $49.6bn on Oct 9, 2026 for iShares Russell 1000 ETF, and $10.3bn on Sep 30, 2026 for Vanguard Morningstar Mega Cap ETF.

MGC costs 0.10 points a year less; their one-year returns differ by 1.4 points; IWB is 4.7 times larger.

IWB vs MGC: Differences, Returns & Fees
IWBMGC
Expense ratio0.15%0.05%
Net assets, as of Sep 30, 2026$48.6bn$10.3bn
Total return, 1 year+16.6%+18.0%
What it tracksRussell 1000 IndexCRSP US Mega Cap Index
Holdings in common78%
Top ten holdings, share of the fund36.1%45.4%

Holdings in common uses holdings dated Aug 31, 2026 and Oct 9, 2026.

+16.6%
IWB total return, 1 year
+18.0%
MGC total return, 1 year
0.15%
IWB expense ratio
0.05%
MGC expense ratio

What they hold in common

By the books each fund has filed, IWB and MGC hold 78% of their money in the same securities at the same weight. Above 50%, holding both is close to holding one of them twice. Holdings dated Aug 31, 2026 and Oct 9, 2026.

half

78% in common

Positions both hold, largest shared weight first
Holding IWB MGC
NVIDIA 7.44% 9.33%
APPLE 6.77% 8.55%
MICROSOFT 5.53% 6.93%
AMAZON.COM INC 3.54% 4.62%
ALPHABET CLASS A 2.85% 3.66%
BROADCOM INC 2.34% 3.22%
ALPHABET CLASS C 2.30% 2.88%
META PLATFORMS CLASS A 2.20% 2.31%
MICRON TECHNOLOGY 1.61% 1.99%
TESLA INC 1.56% 1.91%
ADVANCED MICRO DEVICES 1.38% 1.41%
BERKSHIRE HATHAWAY INC CLASS B 1.34% 1.61%
Only in IWB
MARATHON PETROLEUM 0.19%
VALERO ENERGY CORP 0.17%
CLOUDFLARE CLASS A 0.16%
PHILLIPS 66 0.16%
QUANTA SERVICES INC 0.15%
HEWLETT PACKARD ENTERPRISE 0.14%
CONSTELLATION ENERGY CORP 0.13%
DATADOG INC CLASS A 0.13%
Only in MGC
Seagate Technology Holdings PLC 0.17%
Berkshire Hathaway Inc 0.11%
MKTLIQ 0.10%
SLBBH1142 0.00%

Check overlap with more funds →

On the same fields

IWB
iShares Russell 1000 ETF
MGC
Vanguard Morningstar Mega Cap ETF
Where it sits Stock ETF Stock ETF
Issuer iShares Vanguard
What it is Tracks the Russell 1000 Tracks an index
Total return, 1 year +16.6% +18.0%
Its benchmark over the same days +16.8% (VONE) not published
Gap to its benchmark −0.1 pts vs VONE not available
Expense ratio 0.15% 0.05%
Already in the S&P 500 91.7% 99.3%
Holdings 1025 174
Net assets, IWB as of Oct 9, 2026 and MGC as of Sep 30, 2026 $49.6bn $10.3bn

IWB and MGC on the fields both publish, as of Oct 9, 2026. Source: ETFIQ.

About IWB

IWB tracks the Russell 1000. Over the year to Oct 9, 2026 it returned +16.6% with distributions reinvested, against +16.8% 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 9, 2026, 92% of the fund by weight is stocks the S&P 500 also holds, across 1,025 positions, with the top ten at 36.1%.

About MGC

MGC tracks an index. Over the year to Oct 9, 2026 it returned +18.0% with distributions reinvested. The prospectus expense ratio is 0.05% a year. By its holdings published by its issuer as of Aug 31, 2026, 99% of the fund by weight is stocks the S&P 500 also holds, across 174 positions, with the top ten at 45.4%.

Questions people ask

Which returned more over the last year, IWB or MGC?
In the year to Oct 9, 2026, with distributions reinvested, IWB returned +16.6% and MGC +18.0%.
Which is cheaper, IWB or MGC?
MGC is cheaper, by 0.10 percentage points a year. That is about $10 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do IWB and MGC overlap with the S&P 500?
By their latest filed holdings, 92% of IWB and 99% of MGC by weight is stocks the S&P 500 already holds.
Other comparisons
IWB vs PBUSIWB vs JQUAIWB vs XLGIWB vs THROMGC vs QUALMGC vs SCHBMGC vs RDVYMGC vs USMV
IWB on its own →MGC on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
IWB filings on SEC EDGAR ↗IWB prospectus with the expense ratio (SEC) ↗iShares page for IWB ↗MGC filings on SEC EDGAR ↗MGC prospectus with the expense ratio (SEC) ↗Vanguard page for MGC ↗

ETFIQ links to the documents behind every figure; a link is not an endorsement. 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.

Cite this pageCitation, APA and Markdown

ETFIQ, IWB against MGC, data as of Oct 9, 2026. https://etfiq.com/compare/any/iwb-vs-mgc

Open data

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