ACMGvsMDYGETF Comparison
American Century Mid Cap Growth Impact ETF (ACMG) and State Street SPDR S&P 400 Mid Cap Growth ETF (MDYG) belong to the same industry segment: US Mid Cap Growth. In contrast, MDYG's top sector exposures are Technology, Industrials and Healthcare. ACMG is more expensive with a Total Expense Ratio (TER) of 0.45%, versus 0.15% for MDYG. ACMG is up 12.41% year-to-date (YTD) with +$37M in YTD flows. MDYG performs better with 15.18% YTD performance, and +$63M in YTD flows. Run a side-by-side ETF comparison of ACMG and MDYG below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
ACMG vs MDYG performance and flow charts
Performance
Cumulative Flows
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | ACMG MDYG | +5.61%+1.12% | +4.18%-1.37% | +12.41%+15.18% | +8.87%+17.69% | +64.42%+59.22% | +28.77%+44.98% |
| Flows | ACMG MDYG | +$36M+$58M | +$38M+$96M | +$37M+$63M | +$45M+$63M | +$66M+$46M | +$95M+$406M |
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | ACMG MDYG | +16.92%+14.39% | +19.37%+17.44% | +20.36%+18.89% | +24.10%+20.74% |
| Max drawdown | ACMG MDYG | -6.82%-8.24% | -14.34%-9.91% | -23.84%-25.46% | -40.04%-29.25% |
| Max drawdown duration | ACMG MDYG | 34d56d | 214d45d | 154d379d | 1060d834d |
ACMG | MDYG | |
Last sale 10/12/2026 at 7:59 PM | $105.98 | |
| Previous close 10/09/2026 | $106.89 | |
| Consolidated volume 10/09/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
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ACMG | MDYG | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
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ACMG | MDYG | |
|---|---|---|
| Last price | – | $105.98 |
| 1D performance | – | -0.85% |
| AuM | $145.57 M | $2.86 B |
| E/R | 0.45% | 0.15% |
ACMG | MDYG | |
|---|---|---|
| Management strategy | Active | Passive |
| Provider | American Century Investments | State Street Investment Management |
| Benchmark | - | S&P MidCap 400 Growth Index |
| N° of holdings | - | 246 |
| Asset class | - | Equities |
| Trailing 12m distribution yield | Join | Join |
| Inception date | July 15, 2020 | November 8, 2005 |
| ESG | Yes | No |
Countries
Sectors
Diversification
Total weight of top 15 holdings out of 15
