MID vs. SDSI

Last updated Jun 23, 2026

MID (American Century Mid Cap Growth Impact ETF) and SDSI (American Century Short Duration Strategic Income ETF) are both exchange-traded funds - MID is a Mid Cap Growth Equities fund actively managed by American Century, while SDSI is a Short-Term Bond fund tracking the Bloomberg U.S. 1-3 Year Government/Credit Bond Index. MID is actively managed, while SDSI is passively managed. Over the past 3 years, MID returned 13.92%/yr vs 5.83%/yr for SDSI. At a 0.25 correlation, their price movements are largely independent. MID charges 0.45%/yr vs 0.33%/yr for SDSI.

Performance

MID vs. SDSI - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Mid Cap Growth Impact ETF (MID) and American Century Short Duration Strategic Income ETF (SDSI). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MID achieves a 3.69% return, which is significantly higher than SDSI's 1.28% return.

MID

• 1D: -0.08%
• 1M: 3.12%
• YTD: 3.69%
• 6M: 1.87%
• 1Y: 5.91%
• 3Y*: 13.92%
• 5Y*: 4.34%
• 10Y*: —

SDSI

• 1D: -0.05%
• 1M: 0.29%
• YTD: 1.28%
• 6M: 1.46%
• 1Y: 4.89%
• 3Y*: 5.83%
• 5Y*: —
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

MID vs. SDSI - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
MID American Century Mid Cap Growth Impact ETF	3.69%	8.22%	19.40%	22.20%	6.50%
SDSI American Century Short Duration Strategic Income ETF	1.28%	6.54%	5.63%	5.88%	1.99%

Correlation

The correlation between MID and SDSI is 0.42, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.42
Correlation (3Y) Calculated over the trailing 3-year period	0.28
Correlation (All Time) Calculated using the full available price history since Oct 13, 2022	0.25

The correlation between MID and SDSI shifts across timeframes, from 0.25 (all time) to 0.42 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

MID vs. SDSI — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

MID

MID Risk / Return Rank: 13
MID Sharpe Ratio Rank: 13
MID Sortino Ratio Rank: 12
MID Omega Ratio Rank: 12
MID Calmar Ratio Rank: 13
MID Martin Ratio Rank: 14

SDSI

SDSI Risk / Return Rank: 90
SDSI Sharpe Ratio Rank: 92
SDSI Sortino Ratio Rank: 94
SDSI Omega Ratio Rank: 93
SDSI Calmar Ratio Rank: 83
SDSI Martin Ratio Rank: 90

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

MID vs. SDSI - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Mid Cap Growth Impact ETF (MID) and American Century Short Duration Strategic Income ETF (SDSI). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	MID	SDSI	Difference
Sharpe ratio: Return per unit of total volatility	0.34	3.05	-2.71
Sortino ratio: Return per unit of downside risk	0.59	4.63	-4.04
Omega ratio: Gain probability vs. loss probability	1.07	1.62	-0.55
Calmar ratio: Return relative to maximum drawdown	0.43	4.20	-3.77
Martin ratio: Return relative to average drawdown	1.25	19.76	-18.51

MID vs. SDSI - Sharpe Ratio Comparison

The current MID Sharpe Ratio is 0.34, which is lower than the SDSI Sharpe Ratio of 3.05. The chart below compares the historical Sharpe Ratios of MID and SDSI, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

MID vs. SDSI - Drawdown Comparison

The maximum MID drawdown since its inception was -40.15%, which is greater than SDSI's maximum drawdown of -1.29%. Use the drawdown chart below to compare losses from any high point for MID and SDSI.

Drawdown Indicators

	MID	SDSI	Difference
Max Drawdown Largest peak-to-trough decline	-40.15%	-1.29%	-38.86%
Max Drawdown (1Y) Largest decline over 1 year	-13.89%	-1.17%	-12.72%
Max Drawdown (3Y) Largest decline over 3 years	-23.92%	-1.29%	-22.63%
Max Drawdown (5Y) Largest decline over 5 years	-40.15%	—	—
Current Drawdown Current decline from peak	-2.38%	-0.14%	-2.24%
Average Drawdown Average peak-to-trough decline	-13.35%	-0.24%	-13.11%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.72%	0.25%	+4.47%

Volatility

MID vs. SDSI - Volatility Comparison

American Century Mid Cap Growth Impact ETF (MID) has a higher volatility of 6.50% compared to American Century Short Duration Strategic Income ETF (SDSI) at 0.49%. This indicates that MID's price experiences larger fluctuations and is considered to be riskier than SDSI based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MID	SDSI	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.50%	0.49%	+6.01%
Volatility (6M) Calculated over the trailing 6-month period	13.81%	1.20%	+12.61%
Volatility (1Y) Calculated over the trailing 1-year period	17.43%	1.61%	+15.82%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.71%	2.27%	+21.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.93%	2.27%	+21.66%

MID vs. SDSI - Expense Ratio Comparison

MID has a 0.45% expense ratio, which is higher than SDSI's 0.33% expense ratio.

Dividends

MID vs. SDSI - Dividend Comparison

MID's dividend yield for the trailing twelve months is around 0.18%, less than SDSI's 4.79% yield.

Position	TTM	2025	2024	2023	2022
MID American Century Mid Cap Growth Impact ETF	0.18%	0.18%	0.17%	0.02%	0.00%
SDSI American Century Short Duration Strategic Income ETF	4.79%	4.91%	5.49%	5.37%	0.98%

Frequently Asked Questions

Can I hold both MID and SDSI in my portfolio?

MID and SDSI have a correlation of 0.42, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MID or SDSI?

MID has higher volatility (6.50%) compared to SDSI (0.49%). In terms of maximum drawdown, MID dropped -40.15% vs SDSI's -1.29%.

Which ETF is better, MID or SDSI?

On 3-year performance, MID leads with 13.92% vs 5.83% for SDSI. On fees, SDSI is cheaper at 0.33% per year. On volatility, SDSI has been the lower-risk option at 0.49%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, MID or SDSI?

Over the 3-year period, MID has performed better with a 13.92% return vs 5.83%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, MID or SDSI?

SDSI is cheaper with a 0.33% expense ratio, compared with 0.45% for MID.

Which ETF pays a higher dividend yield, MID or SDSI?

SDSI has the higher dividend yield at 4.79%, compared with 0.18% for MID.

What is the main difference between MID and SDSI?

MID is categorized as Mid Cap Growth Equities, while SDSI is Short-Term Bond. Their fees differ too: 0.45% for MID and 0.33% for SDSI.

Which has better risk-adjusted returns?

SDSI currently has the higher Sharpe Ratio (3.05 vs 0.34), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.