INMU vs. PMMF

Last updated Jun 4, 2026

INMU (BlackRock Intermediate Muni Income Bond ETF) and PMMF (iShares Prime Money Market ETF) are both exchange-traded funds - INMU is a Municipal Bonds fund actively managed by BlackRock, while PMMF is a Money Market fund actively managed by BlackRock. Both are actively managed. Over the past year, INMU returned 7.17% vs 4.00% for PMMF. At a 0.06 correlation, their price movements are largely independent. INMU charges 0.30%/yr vs 0.20%/yr for PMMF.

Performance

INMU vs. PMMF - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in BlackRock Intermediate Muni Income Bond ETF (INMU) and iShares Prime Money Market ETF (PMMF). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, INMU achieves a 1.73% return, which is significantly higher than PMMF's 1.52% return.

INMU

• 1D: 0.00%
• 1M: 0.57%
• YTD: 1.73%
• 6M: 1.98%
• 1Y: 7.17%
• 3Y*: 4.89%
• 5Y*: 1.78%
• 10Y*: —

PMMF

• 1D: 0.01%
• 1M: 0.30%
• YTD: 1.52%
• 6M: 1.82%
• 1Y: 4.00%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

INMU vs. PMMF - Yearly Performance Comparison

	2026 (YTD)	2025
INMU BlackRock Intermediate Muni Income Bond ETF	1.73%	4.40%
PMMF iShares Prime Money Market ETF	1.52%	3.85%

Correlation

The correlation between INMU and PMMF is 0.04, 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	0.04
Correlation (All Time) Calculated using the full available price history since Feb 7, 2025	0.06

Return for Risk

INMU vs. PMMF — Risk / Return Rank

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

INMU

INMU Risk / Return Rank: 76
INMU Sharpe Ratio Rank: 86
INMU Sortino Ratio Rank: 90
INMU Omega Ratio Rank: 93
INMU Calmar Ratio Rank: 57
INMU Martin Ratio Rank: 55

PMMF

PMMF Risk / Return Rank: 100
PMMF Sharpe Ratio Rank: 100
PMMF Sortino Ratio Rank: 100
PMMF Omega Ratio Rank: 100
PMMF Calmar Ratio Rank: 100
PMMF Martin Ratio Rank: 100

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.

INMU vs. PMMF - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BlackRock Intermediate Muni Income Bond ETF (INMU) and iShares Prime Money Market ETF (PMMF). 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.

	INMU	PMMF	Difference
Sharpe ratio: Return per unit of total volatility	2.87	19.72	-16.85
Sortino ratio: Return per unit of downside risk	4.22	95.22	-91.00
Omega ratio: Gain probability vs. loss probability	1.65	38.37	-36.73
Calmar ratio: Return relative to maximum drawdown	2.79	161.17	-158.38
Martin ratio: Return relative to average drawdown	9.53	1,488.23	-1,478.70
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

INMU vs. PMMF - Sharpe Ratio Comparison

The current INMU Sharpe Ratio is 2.87, which is lower than the PMMF Sharpe Ratio of 19.72. The chart below compares the historical Sharpe Ratios of INMU and PMMF, 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

	INMU	PMMF	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.87	19.72	-16.85
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.50	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.60	11.97	-11.38

Drawdowns

INMU vs. PMMF - Drawdown Comparison

The maximum INMU drawdown since its inception was -10.67%, which is greater than PMMF's maximum drawdown of -0.13%. Use the drawdown chart below to compare losses from any high point for INMU and PMMF.

Drawdown Indicators

	INMU	PMMF	Difference
Max Drawdown Largest peak-to-trough decline	-10.67%	-0.13%	-10.54%
Max Drawdown (1Y) Largest decline over 1 year	-2.58%	-0.02%	-2.56%
Max Drawdown (3Y) Largest decline over 3 years	-4.88%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-10.67%	—	—
Current Drawdown Current decline from peak	-0.66%	0.00%	-0.66%
Average Drawdown Average peak-to-trough decline	-2.81%	-0.00%	-2.81%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.75%	0.00%	+0.75%

Volatility

INMU vs. PMMF - Volatility Comparison

BlackRock Intermediate Muni Income Bond ETF (INMU) has a higher volatility of 0.81% compared to iShares Prime Money Market ETF (PMMF) at 0.05%. This indicates that INMU's price experiences larger fluctuations and is considered to be riskier than PMMF based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	INMU	PMMF	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.81%	0.05%	+0.76%
Volatility (6M) Calculated over the trailing 6-month period	1.88%	0.12%	+1.76%
Volatility (1Y) Calculated over the trailing 1-year period	2.51%	0.20%	+2.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.60%	0.34%	+3.26%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.54%	0.34%	+3.20%

INMU vs. PMMF - Expense Ratio Comparison

INMU has a 0.30% expense ratio, which is higher than PMMF's 0.20% expense ratio.

Dividends

INMU vs. PMMF - Dividend Comparison

INMU's dividend yield for the trailing twelve months is around 3.36%, less than PMMF's 3.83% yield.

Position	TTM	2025	2024	2023	2022	2021
INMU BlackRock Intermediate Muni Income Bond ETF	3.36%	3.48%	3.47%	3.44%	1.92%	1.14%
PMMF iShares Prime Money Market ETF	3.83%	3.59%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both INMU and PMMF in my portfolio?

INMU and PMMF have a correlation of 0.04, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, INMU or PMMF?

INMU has higher volatility (0.81%) compared to PMMF (0.05%). In terms of maximum drawdown, INMU dropped -10.67% vs PMMF's -0.13%.

Which ETF is better, INMU or PMMF?

On 1-year performance, INMU leads with 7.17% vs 4.00% for PMMF. On fees, PMMF is cheaper at 0.20% per year. On volatility, PMMF has been the lower-risk option at 0.05%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, INMU or PMMF?

Over the 1-year period, INMU has performed better with a 7.17% return vs 4.00%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, INMU or PMMF?

PMMF is cheaper with a 0.20% expense ratio, compared with 0.30% for INMU.

Which ETF pays a higher dividend yield, INMU or PMMF?

PMMF has the higher dividend yield at 3.83%, compared with 3.36% for INMU.

What is the main difference between INMU and PMMF?

INMU is categorized as Municipal Bonds, while PMMF is Money Market. Their fees differ too: 0.30% for INMU and 0.20% for PMMF.

Which has better risk-adjusted returns?

PMMF currently has the higher Sharpe Ratio (19.72 vs 2.87), 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.