Data as of Oct 28, 2026.
AGG vs MGK: Differences, Returns & Fees
Over the year to Oct 28, 2026, AGG returned −1.4% to MGK's +7.8%; 0% of their weight is in the same names.
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Net assets: $139.4bn on Oct 27, 2026 for iShares Core U.S. Aggregate Bond ETF, and $34.9bn on Sep 30, 2026 for Vanguard Morningstar Mega Cap Growth ETF.
Pair scorecard
AGG costs 0.02 points a year less; their one-year returns differ by 9.2 points; AGG is 3.9 times larger.
| Measure | AGG | MGK |
|---|---|---|
| Return | ||
| Total return, 1 year | −1.4% | +7.8% |
| Drawdown | ||
| Below its high | 3.4%, high on Aug 4, 2020 | 4.4%, high on Oct 6, 2026 |
| Benchmark | ||
| What it tracks | Bloomberg U.S. Aggregate Bond Index | Morningstar US Mega Cap Growth Index |
| Cost and size | ||
| Expense ratio | 0.03% | 0.05% |
| Net assets, as of Sep 30, 2026 | $135.7bn | $34.9bn |
| Holdings | ||
| Holdings in common | 0% | |
| In the S&P 500, by weight | 99% | |
| Top ten holdings, share of the fund | 64.5% | |
Holdings in common uses holdings dated Sep 30, 2026 and Oct 27, 2026. Method
Risk and return
Jan 4, 2008 to Oct 23, 2026 · 981 weekly returnsMGK returned more: +1,024.1% to +64.1%. AGG swung less: 5.4% to 19.5%. AGG fell less at its worst: −18.2% to −46.4%.
Full scorecard
9 measures, with how each is measured Open ↓
| Measure | AGG | MGK | Edge | How it is measured |
|---|---|---|---|---|
| Return | ||||
| Total return | +64.1% | +1,024.1% | MGK | Price change plus distributions, reinvested. |
| Annualized | +2.7% | +13.7% | MGK | Total return as a yearly rate. |
| Price return | −6.0% | +823.8% | MGK | Price change alone, distributions left out. |
| Risk | ||||
| Volatility | 5.4% | 19.5% | AGG | Spread of weekly returns, annualized. Lower is steadier. |
| Downside deviation | 4.1% | 13.3% | AGG | Like volatility, counting only weeks below the Treasury bill rate. |
| Max drawdown | −18.2% | −46.4% | AGG | Deepest fall from a high to the low after it. |
| Risk-adjusted | ||||
| Sharpe | 0.24 | 0.68 | MGK | Return above Treasury bills per unit of volatility. |
| Sortino | 0.33 | 1.00 | MGK | Return above Treasury bills per unit of downside deviation. |
| Calmar | 0.15 | 0.30 | MGK | Annualized return divided by the max drawdown. |
Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 981 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, AGG and MGK hold 0% of their money in the same securities at the same weight. Holdings dated Sep 30, 2026 and Oct 27, 2026.
half
0% in common
Only in one fund ↓
Side by side
AGG and MGK on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
AGG and MGK do different jobs. What does each one do in a portfolio?
- What each follows. AGG follows Bloomberg U.S. Aggregate Bond Index and MGK follows Morningstar US Mega Cap Growth Index.
- Holdings in common. 0% of the weight is in the same securities (holdings dated Oct 27, 2026 and Sep 30, 2026).
- One-year total return. Over 1 year to Oct 28, 2026 AGG returned −1.4% and MGK +7.8% with distributions reinvested, a gap of 9.2 points.
Data as of Oct 28, 2026.
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AGG
AGG tracks an index of US aggregate bonds. Over the year to Oct 28, 2026 it returned −1.4% with distributions reinvested, against −1.3% for its benchmark, the Bloomberg U.S. Aggregate Bond Index. The prospectus expense ratio is 0.03% a year. It sat 3.4% below its high of Aug 4, 2020 on Oct 28, 2026.
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
- Which returned more over the last year, AGG or MGK?
- In the year to Oct 28, 2026, with distributions reinvested, AGG returned −1.4% and MGK +7.8%.
- Which is cheaper, AGG or MGK?
- AGG is cheaper, by 0.02 percentage points a year. That is about $2 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, AGG against MGK, data as of Oct 28, 2026. https://etfiq.com/compare/any/agg-vs-mgk
ETFIQ. (Oct 28, 2026). AGG against MGK. Retrieved from https://etfiq.com/compare/any/agg-vs-mgk
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