IUSG vs MGK: Differences, Returns & Fees
IUSG and MGK hold 71% of their weight in the same names, and IUSG returned +15.9% over the year. Net assets: $33.6bn on Oct 20, 2026 for iShares Core S&P U.S. Growth ETF, and $34.9bn on Sep 30, 2026 for Vanguard Morningstar Mega Cap Growth ETF.
IUSG costs 0.01 points a year less; their one-year returns differ by 4.0 points.
| IUSG | MGK | |
|---|---|---|
| Expense ratio | 0.04% | 0.05% |
| Net assets, as of Sep 30, 2026 | $34.0bn | $34.9bn |
| Total return, 1 year | +15.9% | +11.9% |
| What it tracks | S&P 900 Growth Index | Morningstar US Mega Cap Growth Index |
| Holdings in common | 71% | |
| Top ten holdings, share of the fund | 57.4% | 64.5% |
| Below its high | 4.1%, 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.
IUSG and MGK are built for the same job. How do they differ in cost, holdings and results?
- What each follows. IUSG follows S&P 900 Growth Index and MGK follows Morningstar US Mega Cap Growth Index.
- One-year total return. Over 1 year to Oct 20, 2026 IUSG returned +15.9% and MGK +11.9% with distributions reinvested, a gap of 4.0 points.
- Number of holdings. IUSG holds 402 positions and MGK holds 54.
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, IUSG and MGK hold 71% of their money in the same securities at the same weight. Holdings dated Sep 30, 2026 and Oct 19, 2026.
half
71% in common
On the same fields
IUSG and MGK on the fields both publish, as of Oct 20, 2026. Source: ETFIQ.
About IUSG
IUSG tracks an index. Over the year to Oct 20, 2026 it returned +15.9% with distributions reinvested. The prospectus expense ratio is 0.04% a year. By its holdings published by its issuer for Oct 19, 2026, 95% of the fund by weight is stocks the S&P 500 also holds, across 402 positions, with the top ten at 57.4%. It sat 4.1% below its high of Oct 6, 2026 on Oct 20, 2026.
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, IUSG or MGK?
- In the year to Oct 20, 2026, with distributions reinvested, IUSG returned +15.9% and MGK +11.9%.
- Which is cheaper, IUSG or MGK?
- IUSG is cheaper, by 0.01 percentage points a year. That is about $1 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, IUSG against MGK, data as of Oct 20, 2026. https://etfiq.com/compare/any/iusg-vs-mgk
ETFIQ. (Oct 20, 2026). IUSG against MGK. Retrieved from https://etfiq.com/compare/any/iusg-vs-mgk
[IUSG against MGK (ETFIQ, Oct 20, 2026)](https://etfiq.com/compare/any/iusg-vs-mgk)
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