Which returned more over the last year, IWC or MGK?

In the year to Sep 13, 2026, with distributions reinvested, IWC returned +31.3% and MGK returned +14.9%, so IWC returned more. One year is one year; the longer windows are in the table.

How much do IWC and MGK overlap with the S&P 500?

By their latest filed holdings, 92% of IWC and 99% of MGK by weight is stocks the S&P 500 already holds. Between the two funds, 0% of their books are the same securities at the same weight.

Data as of Sep 13, 2026. Both funds on the fields they both publish, from the same sources.

ETFIQetfiq.com · independent ETF data

IWC vs MGK: how they differ

IWC and MGK hold 0% of their weight in the same names, and IWC returned more over the year.

iShares Micro-Cap ETF and Vanguard Mega Cap Growth Index Fund.

What they hold in common

By the books each fund has filed, IWC and MGK hold 0% of their money in the same securities at the same weight.

Largest positions each one holds and the other does not
Only in IWC	Only in MGK
CAREDX 0.61%	NVIDIA Corp 13.29%
SELLAS LIFE SCIENCES GROUP INC 0.60%	Apple Inc 12.19%
NURIX THERAPEUTICS 0.59%	Microsoft Corp 7.52%
PENGUIN SOLUTIONS INC 0.58%	Alphabet Inc 5.93%
OUSTER 0.52%	Alphabet Inc 4.67%
VIRIDIAN THERAPEUTICS ORS 0.48%	Amazon.com Inc 4.47%
INTERFACE 0.47%	Broadcom Inc 4.28%
MBX BIOSCIENCES 0.45%	Meta Platforms Inc 4.08%

Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Jun 30, 2026 and Sep 10, 2026.

IWC and MGK on the fields both publish, as of Sep 13, 2026. Source: ETFIQ.
	IWC iShares Micro-Cap ETF	MGK Vanguard Mega Cap Growth Index Fund
Where it sits	Core index fund	Core index fund
Issuer	iShares	Vanguard
What it is	Russell Microcap	Mega Cap Growth
Total return, 1 year	+31.3%	+14.9%
S&P 500 over the same days	+17.5%	+17.5%
Gap to the S&P 500	+13.8 pts	−2.6 pts
Expense ratio	not published	0.07%
Already in the S&P 500	91.9%	99.2%
Holdings	1252	56

IWC in plain words

IWC is an index equity fund tracking the Russell Microcap. Over the year to Sep 11, 2026 it returned +31.3% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. By its holdings filed for Sep 10, 2026, 92% of the fund by weight is stocks the S&P 500 also holds, across 1252 positions, with the top ten at 5.1%. It sat 5.0% below its high of Aug 14, 2026 on Sep 11, 2026.

MGK in plain words

MGK is an index equity fund tracking the Mega Cap Growth. Over the year to Sep 11, 2026 it returned +14.9% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.07% a year. By its holdings filed for Jun 30, 2026, 99% of the fund by weight is stocks the S&P 500 also holds, across 56 positions, with the top ten at 63.8%.

Questions people ask

Which returned more over the last year, IWC or MGK?: In the year to Sep 13, 2026, with distributions reinvested, IWC returned +31.3% and MGK returned +14.9%, so IWC returned more. One year is one year; the longer windows are in the table.
How much do IWC and MGK overlap with the S&P 500?: By their latest filed holdings, 92% of IWC and 99% of MGK by weight is stocks the S&P 500 already holds. Between the two funds, 0% of their books are the same securities at the same weight.

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Where these figures came from

ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.

IWC against MGK, ETFIQ, data as of Sep 13, 2026. Every figure is arithmetic on a named public source; the method is at etfiq.com/methodology. A comparison is not a recommendation.

Cite this page. ETFIQ, IWC against MGK, data as of Sep 13, 2026. https://etfiq.com/compare/any/iwc-vs-mgk Free to use with attribution; the underlying files are at Open data.

A comparison is not a recommendation. Standards and sources