IBMM vs. THYM

Last updated Jun 5, 2026

IBMM (iShares iBonds Dec 2024 Term Muni Bond ETF) and THYM (T. Rowe Price High Income Municipal ETF) are both exchange-traded funds - IBMM is a Municipal Bonds fund tracking the S&P AMT-Free Municipal Series Dec 2024 Index, while THYM is a High Yield Muni fund actively managed by T. Rowe Price. IBMM is passively managed, while THYM is actively managed. IBMM charges 0.18%/yr vs 0.32%/yr for THYM.

Performance

IBMM vs. THYM - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares iBonds Dec 2024 Term Muni Bond ETF (IBMM) and T. Rowe Price High Income Municipal ETF (THYM). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

IBMM

• 1D: 0.00%
• 1M: 0.00%
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

THYM

• 1D: 0.36%
• 1M: 1.53%
• YTD: 3.70%
• 6M: 4.04%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

IBMM vs. THYM - Yearly Performance Comparison

	2026 (YTD)
IBMM iShares iBonds Dec 2024 Term Muni Bond ETF	0.00%
THYM T. Rowe Price High Income Municipal ETF	2.57%

Return for Risk

IBMM vs. THYM - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares iBonds Dec 2024 Term Muni Bond ETF (IBMM) and T. Rowe Price High Income Municipal ETF (THYM). 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.

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

Sharpe Ratios by Period

	IBMM	THYM	Difference
Sharpe Ratio (All Time) Calculated using the full available price history	—	1.77	—

Drawdowns

IBMM vs. THYM - Drawdown Comparison

The maximum IBMM drawdown since its inception was 0.00%, smaller than the maximum THYM drawdown of -2.93%. Use the drawdown chart below to compare losses from any high point for IBMM and THYM.

Drawdown Indicators

	IBMM	THYM	Difference
Max Drawdown Largest peak-to-trough decline	0.00%	-2.93%	+2.93%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	0.00%	-0.49%	+0.49%

Volatility

Volatility by Period

	IBMM	THYM	Difference
Volatility (1Y) Calculated over the trailing 1-year period	0.00%	4.35%	-4.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.00%	4.35%	-4.35%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.00%	4.35%	-4.35%

IBMM vs. THYM - Expense Ratio Comparison

IBMM has a 0.18% expense ratio, which is lower than THYM's 0.32% expense ratio.

Dividends

IBMM vs. THYM - Dividend Comparison

IBMM has not paid dividends to shareholders, while THYM's dividend yield for the trailing twelve months is around 2.18%.

Position	TTM	2025
IBMM iShares iBonds Dec 2024 Term Muni Bond ETF	0.00%	0.00%
THYM T. Rowe Price High Income Municipal ETF	2.18%	0.37%

Frequently Asked Questions

Which ETF is better, IBMM or THYM?

On fees, IBMM is cheaper at 0.18% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, IBMM or THYM?

IBMM is cheaper with a 0.18% expense ratio, compared with 0.32% for THYM.

Which ETF pays a higher dividend yield, IBMM or THYM?

THYM has the higher dividend yield at 2.18%, compared with 0.00% for IBMM.

What is the main difference between IBMM and THYM?

IBMM is categorized as Municipal Bonds, while THYM is High Yield Muni. They also come from different issuers: iShares and T. Rowe Price. Their fees differ too: 0.18% for IBMM and 0.32% for THYM.