THYM vs. IBMS

Last updated Jun 25, 2026

THYM (T. Rowe Price High Income Municipal ETF) and IBMS (iShares iBonds Dec 2030 Term Muni Bond ETF) are both exchange-traded funds - THYM is a High Yield Muni fund actively managed by T. Rowe Price, while IBMS is a Municipal Bonds fund tracking the S&P AMT-Free Municipal Series Callable-Adjusted Dec 2030 Index. THYM is actively managed, while IBMS is passively managed. A 0.56 correlation means they provide meaningful diversification when combined. THYM charges 0.32%/yr vs 0.18%/yr for IBMS.

Performance

THYM vs. IBMS - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price High Income Municipal ETF (THYM) and iShares iBonds Dec 2030 Term Muni Bond ETF (IBMS). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, THYM achieves a 4.16% return, which is significantly higher than IBMS's 0.25% return.

THYM

• 1D: 0.53%
• 1M: 2.22%
• YTD: 4.16%
• 6M: 4.33%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

IBMS

• 1D: -0.12%
• 1M: 0.61%
• YTD: 0.25%
• 6M: 0.35%
• 1Y: 3.54%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

THYM vs. IBMS - Yearly Performance Comparison

	2026 (YTD)	2025
THYM T. Rowe Price High Income Municipal ETF	4.16%	0.25%
IBMS iShares iBonds Dec 2030 Term Muni Bond ETF	0.25%	0.80%

Correlation

The correlation between THYM and IBMS is 0.56, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (All Time) Calculated using the full available price history since Nov 20, 2025	0.56

Return for Risk

THYM vs. IBMS — Risk / Return Rank

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

THYM

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

IBMS

IBMS Risk / Return Rank: 54
IBMS Sharpe Ratio Rank: 62
IBMS Sortino Ratio Rank: 65
IBMS Omega Ratio Rank: 74
IBMS Calmar Ratio Rank: 35
IBMS Martin Ratio Rank: 31

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.

THYM vs. IBMS - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price High Income Municipal ETF (THYM) and iShares iBonds Dec 2030 Term Muni Bond ETF (IBMS). 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.

	THYM	IBMS	Difference
Sharpe ratio: Return per unit of total volatility	—	1.77	—
Sortino ratio: Return per unit of downside risk	—	2.61	—
Omega ratio: Gain probability vs. loss probability	—	1.37	—
Calmar ratio: Return relative to maximum drawdown	—	1.58	—
Martin ratio: Return relative to average drawdown	—	4.04	—

Drawdowns

THYM vs. IBMS - Drawdown Comparison

The maximum THYM drawdown since its inception was -2.93%, roughly equal to the maximum IBMS drawdown of -3.01%. Use the drawdown chart below to compare losses from any high point for THYM and IBMS.

Drawdown Indicators

	THYM	IBMS	Difference
Max Drawdown Largest peak-to-trough decline	-2.93%	-3.01%	+0.08%
Max Drawdown (1Y) Largest decline over 1 year	—	-2.25%	—
Current Drawdown Current decline from peak	0.00%	-1.27%	+1.27%
Average Drawdown Average peak-to-trough decline	-0.46%	-0.71%	+0.25%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.88%	—

Volatility

Volatility by Period

	THYM	IBMS	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.53%	—
Volatility (6M) Calculated over the trailing 6-month period	—	1.47%	—
Volatility (1Y) Calculated over the trailing 1-year period	4.35%	2.00%	+2.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.35%	3.04%	+1.31%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.35%	3.04%	+1.31%

THYM vs. IBMS - Expense Ratio Comparison

THYM has a 0.32% expense ratio, which is higher than IBMS's 0.18% expense ratio.

Dividends

THYM vs. IBMS - Dividend Comparison

THYM's dividend yield for the trailing twelve months is around 2.17%, less than IBMS's 2.52% yield.

Position	TTM	2025	2024
IBMS iShares iBonds Dec 2030 Term Muni Bond ETF	2.52%	2.49%	1.38%
THYM T. Rowe Price High Income Municipal ETF	2.17%	0.37%	0.00%

Frequently Asked Questions

Can I hold both THYM and IBMS in my portfolio?

THYM and IBMS have a correlation of 0.56, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, THYM or IBMS?

On fees, IBMS 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, THYM or IBMS?

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

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

IBMS has the higher dividend yield at 2.52%, compared with 2.17% for THYM.

What is the main difference between THYM and IBMS?

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