Data as of Oct 28, 2026.
MGK vs XBI: Differences, Returns & Fees
Over the year to Oct 28, 2026, MGK returned +7.8% to XBI's +41.2%, and MGK charges 0.05% to XBI's 0.35%.
askIQ about this page
askIQ about MGK and XBI
Net assets: $34.9bn on Sep 30, 2026 for Vanguard Morningstar Mega Cap Growth ETF, and $10.3bn on Oct 27, 2026 for State Street SPDR S&P Biotech ETF.
Pair scorecard
MGK costs 0.30 points a year less; their one-year returns differ by 33.4 points; MGK is 3.4 times larger.
| Measure | MGK | XBI |
|---|---|---|
| Return | ||
| Total return, 1 year | +7.8% | +41.2% |
| Drawdown | ||
| Below its high | 4.4%, high on Oct 6, 2026 | |
| Below its all-time high | 8.9%, high on Feb 8, 2021 | |
| Benchmark | ||
| What it tracks | Morningstar US Mega Cap Growth Index | Biotech |
| Cost and size | ||
| Expense ratio | 0.05% | 0.35% |
| Net assets, as of Sep 30, 2026 | $34.9bn | $10.4bn |
| Active share vs the S&P 500 | 98% | |
| Holdings | ||
| Holdings in common | 1% | |
| Top ten holdings, share of the fund | 64.5% | 18% |
Holdings in common uses holdings dated Sep 30, 2026 and Oct 27, 2026. Method
What they share
By the books each fund has filed, MGK and XBI 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
MGK and XBI on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
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.
XBI
By weight, 13% of XBI's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 98%. The top ten holdings are 18% of the fund across 165 positions, as published by its issuer for Oct 27, 2026. Over the year to Oct 28, 2026 the fund returned +41.2% with distributions reinvested. It sits 8.9% below its all-time high of Feb 8, 2021.
Questions people ask
- Are MGK and XBI in the same category?
- MGK is a stock ETF and XBI is a thematic ETF, so they do different jobs. The table compares what both publish: return, cost and holdings.
- Which returned more over the last year, MGK or XBI?
- In the year to Oct 28, 2026, with distributions reinvested, MGK returned +7.8% and XBI +41.2%.
- Which is cheaper, MGK or XBI?
- MGK is cheaper, by 0.30 percentage points a year. That is about $30 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.
Cite this pageCitation, APA and Markdown
ETFIQ, MGK against XBI, data as of Oct 28, 2026. https://etfiq.com/compare/any/mgk-vs-xbi
ETFIQ. (Oct 28, 2026). MGK against XBI. Retrieved from https://etfiq.com/compare/any/mgk-vs-xbi
[MGK against XBI (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/mgk-vs-xbi)
Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.