MID vs VOO
American Century Mid Cap Growth Impact ETF vs Vanguard S&P 500 ETF
Which is better, MID or VOO?
Mid Cap Growth against Large Cap Blend.
VOO has a lower expense ratio. VOO led over 1Y and the full window. VOO is less concentrated, with 39.1% of the fund in its ten largest positions against 52.3%.
MarketXLS is not an investment adviser. This comparison is generated automatically from market data and is for information only. A Best mark means the better reading on that one measure, not a recommendation to buy.
Side-by-Side Comparison
| Metric | MID | VOO |
|---|---|---|
| Expense Ratio | 0.39% | 0.03%Best |
| AUM | $104M | $1.0T |
| Dividend Yield | 0.14% | 1.05% |
| Holdings | 35 | 519 |
| Volatility (annualized) | 20.3% | 15.4%Best |
| Max Drawdown | -40.1% | -24.5%Best |
| $10,000 over 6.2 years | $18,302 | $26,093Best |
| Top 10 Weight | 52.3% | 39.1%Best |
| Fund Family | American Century Investments | Vanguard (US) |
| Category | Equity | Equity |
| Style | Mid Cap Growth | Large Cap Blend |
| Inception | Jul 15, 2020 | Sep 7, 2010 |
Not shown on this pair: YTD Return, 1Y Return, 3Y Return (annualized), 5Y Return (annualized).
The two price series end 31 days apart, so a return over any period would be measuring two different stretches of market. Those rows are withheld. MID has data through Oct 9, 2026 and VOO through Nov 9, 2026.
Volatility and max drawdown, and the $10,000 over 6.2 years row, are measured over the window both funds cover: Jul 15, 2020 to Oct 9, 2026 (6.2 years).
Risk: Volatility and Drawdowns
MID has been the more volatile fund, with annualized monthly volatility of 20.3% compared with 15.4% for VOO. Lower volatility generally means a smoother ride, though it often comes with lower long-run returns.
The deepest peak-to-trough decline in our data was -40.1% for MID and -24.5% for VOO. Drawdown depth is what each fund did in the worst stretch of the window measured above.
The two funds' monthly returns correlate at 0.83. They usually move together, but the gap leaves some room for diversification.
Fees and Cost Over Time
MID charges 0.39% per year while VOO charges 0.03%. On a $10,000 position that is $39 vs $3 annually, a gap of $36 per year that compounds over a long holding period. On income, MID currently yields 0.14% against 1.05% for VOO.
Holdings Overlap
50.8% of MID's money is in holdings VOO also owns. 1.2% of VOO's money is in holdings MID also owns.
The two portfolios partly overlap.
16 positions in common, counted across the 34 positions we hold weights for in MID and 506 in VOO, against full books of 35 and 519.
What only one of them owns
Our book lists 485 positions for VOO that do not appear in our book for MID (98.7% of the fund), and 15 for MID that do not appear in VOO (42.5%).
Some of those will be the same company recorded under a different code in one of the two books, so the real difference in what you would own is no larger than this and may be smaller. We do not name the individual positions here for that reason.
Top Shared Holdings
| Stock | Weight in MID | Weight in VOO | Difference |
|---|---|---|---|
| MPWRMonolithic Power Systems Inc | 5.47% | 0.10% | 5.37% |
| JCIJohnson Controls Intl Plc | 4.91% | 0.14% | 4.77% |
| CDNSCadence Design | 4.76% | 0.14% | 4.62% |
| TRGPTarga Resources Corp Preferred | 4.68% | 0.09% | 4.59% |
| CMGChipotle Mexican Grill Inc. Class A | 4.58% | 0.06% | 4.52% |
| HUBBHubbell Inc. Class B | 4.19% | 0.04% | 4.15% |
| HLTHilton Worldwide Holdings, Inc. | 3.82% | 0.11% | 3.71% |
| VSTVistra Energy Corp. | 3.17% | 0.07% | 3.10% |
| VRTVertiv Holdings Co | 3.02% | 0.14% | 2.88% |
| RDDTReddit Inc Series C Pc Pp | 2.62% | 0.03% | 2.59% |
50.8% of MID is already inside VOO.
You probably hold more than these two. Add the rest and see how much of the whole book is the same companies twice.
Free for up to 10 holdings. No account needed.
Frequently Asked Questions
Which is cheaper, MID or VOO?
MID has an expense ratio of 0.39% while VOO charges 0.03%. VOO is the cheaper option, by $36 a year on a $10,000 investment.
Which is riskier, MID or VOO?
MID has been the more volatile fund at 20.3% annualized versus 15.4% for VOO. Worst drawdown: MID -40.1% vs VOO -24.5%.
Should I hold both MID and VOO?
MID and VOO have a monthly-return correlation of 0.83, so their returns are far enough apart for the mix to behave differently from either one alone. This is information, not a recommendation.
What is the holdings overlap between MID and VOO?
50.8% of MID's money is in holdings VOO also owns. 1.2% of VOO's is in holdings MID also owns. They hold 16 positions in common, counted across the 34 positions we hold weights for in MID and 506 in VOO.
Which pays a higher dividend, MID or VOO?
MID yields 0.14% while VOO yields 1.05%, so VOO currently pays the higher dividend yield.
Is VOO better than MID?
VOO has a lower expense ratio. VOO led over 1Y and the full window. VOO is less concentrated, with 39.1% of the fund in its ten largest positions against 52.3%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.