RMMBX vs. BDMIX

Last updated Jun 23, 2026

RMMBX (Aspiriant Risk-Managed Municipal Bond Fund) and BDMIX (BlackRock Global Long/Short Equity Fund Class I) are both mutual funds - RMMBX is a Municipal Bonds fund managed by BlackRock, while BDMIX is a Long-Short fund managed by BlackRock. Over the past 10 years, RMMBX returned 2.14%/yr vs 8.56%/yr for BDMIX. At a correlation of -0.02, they often move in opposite directions. RMMBX charges 0.42%/yr vs 1.57%/yr for BDMIX.

Performance

RMMBX vs. BDMIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Aspiriant Risk-Managed Municipal Bond Fund (RMMBX) and BlackRock Global Long/Short Equity Fund Class I (BDMIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RMMBX achieves a 1.40% return, which is significantly lower than BDMIX's 12.96% return. Over the past 10 years, RMMBX has underperformed BDMIX with an annualized return of 2.14%, while BDMIX has yielded a comparatively higher 8.56% annualized return.

RMMBX

• 1D: 0.11%
• 1M: 1.51%
• YTD: 1.40%
• 6M: 1.59%
• 1Y: 5.98%
• 3Y*: 2.80%
• 5Y*: 0.57%
• 10Y*: 2.14%

BDMIX

• 1D: -0.24%
• 1M: 3.39%
• YTD: 12.96%
• 6M: 12.42%
• 1Y: 23.99%
• 3Y*: 21.59%
• 5Y*: 13.31%
• 10Y*: 8.56%

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

RMMBX vs. BDMIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RMMBX Aspiriant Risk-Managed Municipal Bond Fund	1.40%	2.39%	1.90%	5.43%	-8.40%	3.24%	4.88%	7.68%	1.28%	5.65%
BDMIX BlackRock Global Long/Short Equity Fund Class I	12.96%	18.30%	21.39%	14.55%	1.80%	3.34%	0.29%	-0.85%	2.20%	12.85%

Correlation

The correlation between RMMBX and BDMIX is -0.00, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.00
Correlation (3Y) Calculated over the trailing 3-year period	-0.03
Correlation (5Y) Calculated over the trailing 5-year period	-0.00
Correlation (10Y) Calculated over the trailing 10-year period	-0.01
Correlation (All Time) Calculated using the full available price history since Jan 4, 2016	-0.02

Return for Risk

RMMBX vs. BDMIX — Risk / Return Rank

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

RMMBX

RMMBX Risk / Return Rank: 67
RMMBX Sharpe Ratio Rank: 85
RMMBX Sortino Ratio Rank: 83
RMMBX Omega Ratio Rank: 93
RMMBX Calmar Ratio Rank: 36
RMMBX Martin Ratio Rank: 36

BDMIX

BDMIX Risk / Return Rank: 95
BDMIX Sharpe Ratio Rank: 97
BDMIX Sortino Ratio Rank: 95
BDMIX Omega Ratio Rank: 90
BDMIX Calmar Ratio Rank: 98
BDMIX Martin Ratio Rank: 95

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.

RMMBX vs. BDMIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Aspiriant Risk-Managed Municipal Bond Fund (RMMBX) and BlackRock Global Long/Short Equity Fund Class I (BDMIX). 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.

	RMMBX	BDMIX	Difference
Sharpe ratio: Return per unit of total volatility	2.57	3.30	-0.72
Sortino ratio: Return per unit of downside risk	3.62	4.83	-1.21
Omega ratio: Gain probability vs. loss probability	1.69	1.62	+0.07
Calmar ratio: Return relative to maximum drawdown	2.14	7.22	-5.08
Martin ratio: Return relative to average drawdown	7.58	20.52	-12.94

RMMBX vs. BDMIX - Sharpe Ratio Comparison

The current RMMBX Sharpe Ratio is 2.57, which is comparable to the BDMIX Sharpe Ratio of 3.30. The chart below compares the historical Sharpe Ratios of RMMBX and BDMIX, 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

RMMBX vs. BDMIX - Drawdown Comparison

The maximum RMMBX drawdown since its inception was -13.67%, which is greater than BDMIX's maximum drawdown of -11.89%. Use the drawdown chart below to compare losses from any high point for RMMBX and BDMIX.

Drawdown Indicators

	RMMBX	BDMIX	Difference
Max Drawdown Largest peak-to-trough decline	-13.67%	-11.89%	-1.78%
Max Drawdown (1Y) Largest decline over 1 year	-2.86%	-3.24%	+0.38%
Max Drawdown (3Y) Largest decline over 3 years	-6.80%	-4.07%	-2.73%
Max Drawdown (5Y) Largest decline over 5 years	-13.67%	-5.99%	-7.68%
Max Drawdown (10Y) Largest decline over 10 years	-13.67%	-9.44%	-4.23%
Current Drawdown Current decline from peak	-0.42%	-0.24%	-0.18%
Average Drawdown Average peak-to-trough decline	-2.71%	-2.67%	-0.04%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.81%	1.14%	-0.33%

Volatility

RMMBX vs. BDMIX - Volatility Comparison

The current volatility for Aspiriant Risk-Managed Municipal Bond Fund (RMMBX) is 0.54%, while BlackRock Global Long/Short Equity Fund Class I (BDMIX) has a volatility of 2.73%. This indicates that RMMBX experiences smaller price fluctuations and is considered to be less risky than BDMIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RMMBX	BDMIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.54%	2.73%	-2.19%
Volatility (6M) Calculated over the trailing 6-month period	1.86%	4.80%	-2.94%
Volatility (1Y) Calculated over the trailing 1-year period	2.38%	7.10%	-4.72%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.89%	6.58%	-2.69%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.74%	5.85%	-2.11%

RMMBX vs. BDMIX - Expense Ratio Comparison

RMMBX has a 0.42% expense ratio, which is lower than BDMIX's 1.57% expense ratio.

Dividends

RMMBX vs. BDMIX - Dividend Comparison

RMMBX's dividend yield for the trailing twelve months is around 2.84%, less than BDMIX's 7.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BDMIX BlackRock Global Long/Short Equity Fund Class I	7.91%	8.94%	13.26%	7.42%	0.00%	1.23%	0.30%	6.78%	0.94%	0.00%	0.00%	1.86%
RMMBX Aspiriant Risk-Managed Municipal Bond Fund	2.84%	2.88%	2.66%	2.97%	3.76%	4.00%	3.39%	3.46%	3.08%	3.00%	2.22%	0.00%

Frequently Asked Questions

Can I hold both RMMBX and BDMIX in my portfolio?

RMMBX and BDMIX have a correlation of -0.00, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RMMBX or BDMIX?

BDMIX has higher volatility (2.73%) compared to RMMBX (0.54%). In terms of maximum drawdown, RMMBX dropped -13.67% vs BDMIX's -11.89%.

Which has better risk-adjusted returns?

BDMIX currently has the higher Sharpe Ratio (3.30 vs 2.57), 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.