CORB vs. RBIL

Last updated Jun 23, 2026

CORB (AB Core Bond ETF) and RBIL (F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF) are both exchange-traded funds - CORB is a Intermediate Core Bond fund actively managed by AllianceBernstein, while RBIL is a Inflation-Protected Bonds fund tracking the Bloomberg US Ultrashort TIPS 1-13 Months Index. CORB is actively managed, while RBIL is passively managed. At a correlation of -0.22, they often move in opposite directions. CORB charges 0.28%/yr vs 0.17%/yr for RBIL.

Performance

CORB vs. RBIL - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AB Core Bond ETF (CORB) and F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF (RBIL). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CORB achieves a 0.06% return, which is significantly lower than RBIL's 2.32% return.

CORB

• 1D: -0.24%
• 1M: 0.56%
• YTD: 0.06%
• 6M: 0.12%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

RBIL

• 1D: 0.01%
• 1M: -0.19%
• YTD: 2.32%
• 6M: 2.37%
• 1Y: 4.07%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

CORB vs. RBIL - Yearly Performance Comparison

	2026 (YTD)	2025
CORB AB Core Bond ETF	0.06%	0.41%
RBIL F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF	2.32%	0.35%

Correlation

The correlation between CORB and RBIL is -0.22, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (All Time) Calculated using the full available price history since Nov 10, 2025	-0.22

Return for Risk

CORB vs. RBIL — Risk / Return Rank

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

CORB

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

RBIL

RBIL Risk / Return Rank: 97
RBIL Sharpe Ratio Rank: 97
RBIL Sortino Ratio Rank: 98
RBIL Omega Ratio Rank: 98
RBIL Calmar Ratio Rank: 96
RBIL Martin Ratio Rank: 97

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.

CORB vs. RBIL - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AB Core Bond ETF (CORB) and F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF (RBIL). 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.

	CORB	RBIL	Difference
Sharpe ratio: Return per unit of total volatility	—	4.35	—
Sortino ratio: Return per unit of downside risk	—	6.69	—
Omega ratio: Gain probability vs. loss probability	—	2.13	—
Calmar ratio: Return relative to maximum drawdown	—	7.82	—
Martin ratio: Return relative to average drawdown	—	42.95	—

Drawdowns

CORB vs. RBIL - Drawdown Comparison

The maximum CORB drawdown since its inception was -3.08%, which is greater than RBIL's maximum drawdown of -0.52%. Use the drawdown chart below to compare losses from any high point for CORB and RBIL.

Drawdown Indicators

	CORB	RBIL	Difference
Max Drawdown Largest peak-to-trough decline	-3.08%	-0.52%	-2.56%
Max Drawdown (1Y) Largest decline over 1 year	—	-0.52%	—
Current Drawdown Current decline from peak	-1.73%	-0.50%	-1.23%
Average Drawdown Average peak-to-trough decline	-1.04%	-0.07%	-0.97%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.10%	—

Volatility

Volatility by Period

	CORB	RBIL	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.36%	—
Volatility (6M) Calculated over the trailing 6-month period	—	0.85%	—
Volatility (1Y) Calculated over the trailing 1-year period	4.05%	0.95%	+3.10%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.05%	1.07%	+2.98%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.05%	1.07%	+2.98%

CORB vs. RBIL - Expense Ratio Comparison

CORB has a 0.28% expense ratio, which is higher than RBIL's 0.17% expense ratio.

Dividends

CORB vs. RBIL - Dividend Comparison

CORB's dividend yield for the trailing twelve months is around 2.41%, less than RBIL's 4.38% yield.

Position	TTM	2025
CORB AB Core Bond ETF	2.41%	0.81%
RBIL F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF	4.38%	3.65%

Frequently Asked Questions

Can I hold both CORB and RBIL in my portfolio?

CORB and RBIL have a correlation of -0.22, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, CORB or RBIL?

On fees, RBIL is cheaper at 0.17% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, CORB or RBIL?

RBIL is cheaper with a 0.17% expense ratio, compared with 0.28% for CORB.

Which ETF pays a higher dividend yield, CORB or RBIL?

RBIL has the higher dividend yield at 4.38%, compared with 2.41% for CORB.

What is the main difference between CORB and RBIL?

CORB is categorized as Intermediate Core Bond, while RBIL is Inflation-Protected Bonds. They also come from different issuers: AllianceBernstein and F/m. Their fees differ too: 0.28% for CORB and 0.17% for RBIL.