IWY vs MGK: Differences, Returns & Fees
IWY and MGK hold 77% of their weight in the same names, and MGK returned +11.9% over the year. Net assets: $15.8bn on Oct 20, 2026 for iShares Russell Top 200 Growth ETF, and $34.9bn on Sep 30, 2026 for Vanguard Morningstar Mega Cap Growth ETF.
MGK costs 0.15 points a year less; their one-year returns differ by 7.2 points; MGK is 2.1 times larger.
| IWY | MGK | |
|---|---|---|
| Expense ratio | 0.20% | 0.05% |
| Net assets, as of Sep 30, 2026 | $16.4bn | $34.9bn |
| Total return, 1 year | +4.7% | +11.9% |
| What it tracks | Russell Top 200 Growth Index | Morningstar US Mega Cap Growth Index |
| Holdings in common | 77% | |
| Top ten holdings, share of the fund | 60.9% | 64.5% |
| Below its high | 5.2%, high on Oct 6, 2026 | 4.5%, high on Oct 6, 2026 |
Holdings in common uses holdings dated Sep 30, 2026 and Oct 19, 2026.
IWY and MGK are built for the same job. How do they differ in cost, holdings and results?
- What each follows. IWY follows Russell Top 200 Growth Index and MGK follows Morningstar US Mega Cap Growth Index.
- One-year total return. Over 1 year to Oct 20, 2026 IWY returned +4.7% and MGK +11.9% with distributions reinvested, a gap of 7.2 points.
- Cost. IWY charges 0.20% of assets a year and MGK 0.05%, a gap of 0.15 points.
Data as of Oct 20, 2026. The differences are picked by a fixed rule, in a fixed order; the PDF prints it. Page 2 has the returns, overlap, risks and sources.
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What they hold in common
By the books each fund has filed, IWY and MGK hold 77% of their money in the same securities at the same weight. Holdings dated Sep 30, 2026 and Oct 19, 2026.
half
77% in common
On the same fields
IWY and MGK on the fields both publish, as of Oct 20, 2026. Source: ETFIQ.
About IWY
IWY tracks an index. The prospectus expense ratio is 0.20% a year. By its holdings published by its issuer for Oct 19, 2026, 99% of the fund by weight is stocks the S&P 500 also holds, across 102 positions, with the top ten at 60.9%. It sat 5.2% below its high of Oct 6, 2026 on Oct 20, 2026.
Over the year to Oct 20, 2026 it returned +4.7% with distributions reinvested, against +15.0% for its benchmark, the Russell 3000 Index.
About MGK
MGK tracks an index of Mega Cap Growth. Over the year to Oct 20, 2026 it returned +11.9% with distributions reinvested. The prospectus expense ratio is 0.05% a year. By its holdings published by its issuer as of Sep 30, 2026, 99% of the fund by weight is stocks the S&P 500 also holds, across 54 positions, with the top ten at 64.5%. It sat 4.5% below its high of Oct 6, 2026 on Oct 20, 2026.
Questions people ask
- Which returned more over the last year, IWY or MGK?
- In the year to Oct 20, 2026, with distributions reinvested, IWY returned +4.7% and MGK +11.9%.
- Which is cheaper, IWY or MGK?
- MGK is cheaper, by 0.15 percentage points a year. That is about $15 on $10,000 held for a year. Fees come from each fund's prospectus.
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.
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ETFIQ, IWY against MGK, data as of Oct 20, 2026. https://etfiq.com/compare/any/iwy-vs-mgk
ETFIQ. (Oct 20, 2026). IWY against MGK. Retrieved from https://etfiq.com/compare/any/iwy-vs-mgk
[IWY against MGK (ETFIQ, Oct 20, 2026)](https://etfiq.com/compare/any/iwy-vs-mgk)
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