RMAGX vs. MDSIX

Last updated Jun 3, 2026

RMAGX (American Funds Mortgage Fund Class R-6) and MDSIX (Integrity Short Term Government Fund) are both Government Bonds funds. Over the past 10 years, RMAGX returned 1.60%/yr vs 1.97%/yr for MDSIX. A 0.68 correlation means they provide meaningful diversification when combined. RMAGX charges 0.26%/yr vs 0.55%/yr for MDSIX.

Performance

RMAGX vs. MDSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Mortgage Fund Class R-6 (RMAGX) and Integrity Short Term Government Fund (MDSIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RMAGX achieves a -0.08% return, which is significantly lower than MDSIX's 1.54% return. Over the past 10 years, RMAGX has underperformed MDSIX with an annualized return of 1.60%, while MDSIX has yielded a comparatively higher 1.97% annualized return.

RMAGX

• 1D: -0.23%
• 1M: -0.20%
• YTD: -0.08%
• 6M: 0.31%
• 1Y: 5.75%
• 3Y*: 3.89%
• 5Y*: 0.46%
• 10Y*: 1.60%

MDSIX

• 1D: 0.00%
• 1M: 0.40%
• YTD: 1.54%
• 6M: 1.68%
• 1Y: 5.72%
• 3Y*: 5.92%
• 5Y*: 2.14%
• 10Y*: 1.97%

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

RMAGX vs. MDSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RMAGX American Funds Mortgage Fund Class R-6	-0.08%	8.91%	1.01%	3.25%	-10.22%	-0.24%	7.02%	5.09%	0.86%	1.77%
MDSIX Integrity Short Term Government Fund	1.54%	6.91%	6.90%	4.30%	-7.23%	-1.14%	2.76%	3.54%	2.21%	1.19%

Correlation

The correlation between RMAGX and MDSIX is 0.69, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.69
Correlation (3Y) Calculated over the trailing 3-year period	0.80
Correlation (5Y) Calculated over the trailing 5-year period	0.82
Correlation (10Y) Calculated over the trailing 10-year period	0.72
Correlation (All Time) Calculated using the full available price history since Jul 6, 2011	0.68

The correlation between RMAGX and MDSIX shifts across timeframes, from 0.68 (all time) to 0.82 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

RMAGX vs. MDSIX — Risk / Return Rank

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

RMAGX

RMAGX Risk / Return Rank: 21
RMAGX Sharpe Ratio Rank: 20
RMAGX Sortino Ratio Rank: 21
RMAGX Omega Ratio Rank: 20
RMAGX Calmar Ratio Rank: 23
RMAGX Martin Ratio Rank: 23

MDSIX

MDSIX Risk / Return Rank: 83
MDSIX Sharpe Ratio Rank: 69
MDSIX Sortino Ratio Rank: 84
MDSIX Omega Ratio Rank: 77
MDSIX Calmar Ratio Rank: 92
MDSIX Martin Ratio Rank: 93

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.

RMAGX vs. MDSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Mortgage Fund Class R-6 (RMAGX) and Integrity Short Term Government Fund (MDSIX). 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.

	RMAGX	MDSIX	Difference
Sharpe ratio Return per unit of total volatility	1.26	2.43	-1.16
Sortino ratio Return per unit of downside risk	1.94	3.94	-2.00
Omega ratio Gain probability vs. loss probability	1.23	1.51	-0.27
Calmar ratio Return relative to maximum drawdown	1.79	4.97	-3.18
Martin ratio Return relative to average drawdown	5.83	20.24	-14.40
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

RMAGX vs. MDSIX - Sharpe Ratio Comparison

The current RMAGX Sharpe Ratio is 1.26, which is lower than the MDSIX Sharpe Ratio of 2.43. The chart below compares the historical Sharpe Ratios of RMAGX and MDSIX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	RMAGX	MDSIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.26	2.43	-1.16
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.07	0.64	-0.57
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.33	0.63	-0.30
Sharpe Ratio (All Time) Calculated using the full available price history	0.51	0.61	-0.09

Drawdowns

RMAGX vs. MDSIX - Drawdown Comparison

The maximum RMAGX drawdown since its inception was -15.93%, which is greater than MDSIX's maximum drawdown of -11.28%. Use the drawdown chart below to compare losses from any high point for RMAGX and MDSIX.

Drawdown Indicators

	RMAGX	MDSIX	Difference
Max Drawdown Largest peak-to-trough decline	-15.93%	-11.28%	-4.65%
Max Drawdown (1Y) Largest decline over 1 year	-3.37%	-1.22%	-2.15%
Max Drawdown (3Y) Largest decline over 3 years	-7.29%	-2.60%	-4.69%
Max Drawdown (5Y) Largest decline over 5 years	-15.93%	-11.08%	-4.85%
Max Drawdown (10Y) Largest decline over 10 years	-15.93%	-11.28%	-4.65%
Current Drawdown Current decline from peak	-1.79%	-0.16%	-1.63%
Average Drawdown Average peak-to-trough decline	-2.34%	-1.25%	-1.09%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.04%	0.30%	+0.74%

Volatility

RMAGX vs. MDSIX - Volatility Comparison

American Funds Mortgage Fund Class R-6 (RMAGX) has a higher volatility of 1.65% compared to Integrity Short Term Government Fund (MDSIX) at 1.08%. This indicates that RMAGX's price experiences larger fluctuations and is considered to be riskier than MDSIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RMAGX	MDSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.65%	1.08%	+0.57%
Volatility (6M) Calculated over the trailing 6-month period	3.09%	1.81%	+1.28%
Volatility (1Y) Calculated over the trailing 1-year period	4.29%	2.38%	+1.91%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.41%	3.34%	+3.07%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.84%	3.16%	+1.68%

RMAGX vs. MDSIX - Expense Ratio Comparison

RMAGX has a 0.26% expense ratio, which is lower than MDSIX's 0.55% expense ratio.

Dividends

RMAGX vs. MDSIX - Dividend Comparison

RMAGX's dividend yield for the trailing twelve months is around 4.60%, more than MDSIX's 3.28% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MDSIX Integrity Short Term Government Fund	3.28%	2.54%	3.91%	1.51%	0.93%	1.90%	4.41%	3.50%	3.70%	3.01%	2.50%	2.44%
RMAGX American Funds Mortgage Fund Class R-6	4.60%	4.60%	4.94%	3.61%	1.70%	0.74%	4.79%	3.27%	2.14%	2.07%	2.69%	2.82%

Frequently Asked Questions

Can I hold both RMAGX and MDSIX in my portfolio?

RMAGX and MDSIX have a correlation of 0.69, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RMAGX or MDSIX?

RMAGX has higher volatility (1.65%) compared to MDSIX (1.08%). In terms of maximum drawdown, RMAGX dropped -15.93% vs MDSIX's -11.28%.

Which has better risk-adjusted returns?

MDSIX currently has the higher Sharpe Ratio (2.43 vs 1.26), 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.