Data as of Oct 28, 2026.
IBB vs MGK: Differences, Returns & Fees
Over the year to Oct 28, 2026, IBB returned +37.5% to MGK's +7.8%, and MGK charges 0.05% to IBB's 0.44%.
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Net assets: $11.0bn on Oct 27, 2026 for iShares Biotechnology ETF, and $34.9bn on Sep 30, 2026 for Vanguard Morningstar Mega Cap Growth ETF.
Pair scorecard
MGK costs 0.39 points a year less; their one-year returns differ by 29.7 points; MGK is 3.1 times larger.
| Measure | IBB | MGK |
|---|---|---|
| Return | ||
| Total return, 1 year | +37.5% | +7.8% |
| Drawdown | ||
| Below its high | 4.4%, high on Oct 6, 2026 | |
| Benchmark | ||
| What it tracks | Biotech | Morningstar US Mega Cap Growth Index |
| Cost and size | ||
| Expense ratio | 0.44% | 0.05% |
| Net assets, as of Sep 30, 2026 | $11.2bn | $34.9bn |
| Holdings | ||
| Holdings in common | 1% | |
| Top ten holdings, share of the fund | 50% | 64.5% |
Holdings in common uses holdings dated Sep 30, 2026 and Oct 27, 2026. Method
What they share
By the books each fund has filed, IBB and MGK hold 1% of their money in the same securities at the same weight. Holdings dated Sep 30, 2026 and Oct 27, 2026.
half
1% in common
Only in one fund ↓
Side by side
IBB and MGK on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IBB
By weight, 40% of IBB's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 99%. The top ten holdings are 50% of the fund across 245 positions, as published by its issuer for Oct 27, 2026. Over the year to Oct 28, 2026 the fund returned +37.5% with distributions reinvested.
MGK
MGK tracks an index of Mega Cap Growth. Over the year to Oct 28, 2026 it returned +7.8% 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 4.4% below its high of Oct 6, 2026 on Oct 28, 2026.
Questions people ask
- Are IBB and MGK in the same category?
- IBB is a thematic ETF and MGK is a stock ETF, so they do different jobs. The table compares what both publish: return, cost and holdings.
- Which returned more over the last year, IBB or MGK?
- In the year to Oct 28, 2026, with distributions reinvested, IBB returned +37.5% and MGK +7.8%.
- Which is cheaper, IBB or MGK?
- MGK is cheaper, by 0.39 percentage points a year. That is about $39 on $10,000 held for a year. Fees come from each fund's prospectus.
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, IBB against MGK, data as of Oct 28, 2026. https://etfiq.com/compare/any/ibb-vs-mgk
ETFIQ. (Oct 28, 2026). IBB against MGK. Retrieved from https://etfiq.com/compare/any/ibb-vs-mgk
[IBB against MGK (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/ibb-vs-mgk)
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