SWSBX vs. FMFIX

Last updated Jun 4, 2026

SWSBX (Schwab Short-Term Bond Index Fund) and FMFIX (RBB Free Market Fixed Income Fund) are both Short-Term Bond funds. Over the past 5 years, SWSBX returned 1.30%/yr vs 0.95%/yr for FMFIX. A 0.75 correlation means they provide meaningful diversification when combined. SWSBX charges 0.06%/yr vs 0.68%/yr for FMFIX.

Performance

SWSBX vs. FMFIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Schwab Short-Term Bond Index Fund (SWSBX) and RBB Free Market Fixed Income Fund (FMFIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SWSBX achieves a 0.34% return, which is significantly lower than FMFIX's 1.00% return.

SWSBX

• 1D: 0.00%
• 1M: 0.14%
• YTD: 0.34%
• 6M: 0.60%
• 1Y: 3.75%
• 3Y*: 4.12%
• 5Y*: 1.30%
• 10Y*: —

FMFIX

• 1D: 0.00%
• 1M: 0.40%
• YTD: 1.00%
• 6M: 1.05%
• 1Y: 3.70%
• 3Y*: 3.32%
• 5Y*: 0.95%
• 10Y*: 1.27%

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

SWSBX vs. FMFIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SWSBX Schwab Short-Term Bond Index Fund	0.34%	6.06%	3.42%	3.95%	-5.89%	-1.28%	4.47%	4.96%	1.34%	0.85%
FMFIX RBB Free Market Fixed Income Fund	1.00%	4.88%	0.71%	5.43%	-6.52%	-1.06%	3.28%	4.78%	0.65%	0.66%

Correlation

The correlation between SWSBX and FMFIX is 0.72, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.72
Correlation (3Y) Calculated over the trailing 3-year period	0.77
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (All Time) Calculated using the full available price history since Feb 24, 2017	0.75

The correlation between SWSBX and FMFIX has been stable across timeframes, ranging from 0.72 to 0.81 - a consistent structural relationship.

Return for Risk

SWSBX vs. FMFIX — Risk / Return Rank

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

SWSBX

SWSBX Risk / Return Rank: 38
SWSBX Sharpe Ratio Rank: 33
SWSBX Sortino Ratio Rank: 44
SWSBX Omega Ratio Rank: 41
SWSBX Calmar Ratio Rank: 39
SWSBX Martin Ratio Rank: 34

FMFIX

FMFIX Risk / Return Rank: 70
FMFIX Sharpe Ratio Rank: 62
FMFIX Sortino Ratio Rank: 72
FMFIX Omega Ratio Rank: 75
FMFIX Calmar Ratio Rank: 75
FMFIX Martin Ratio Rank: 64

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.

SWSBX vs. FMFIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Schwab Short-Term Bond Index Fund (SWSBX) and RBB Free Market Fixed Income Fund (FMFIX). 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.

	SWSBX	FMFIX	Difference
Sharpe ratio: Return per unit of total volatility	1.64	2.32	-0.67
Sortino ratio: Return per unit of downside risk	2.77	3.54	-0.77
Omega ratio: Gain probability vs. loss probability	1.34	1.49	-0.15
Calmar ratio: Return relative to maximum drawdown	2.37	3.41	-1.04
Martin ratio: Return relative to average drawdown	7.75	12.61	-4.86
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SWSBX vs. FMFIX - Sharpe Ratio Comparison

The current SWSBX Sharpe Ratio is 1.64, which is comparable to the FMFIX Sharpe Ratio of 2.32. The chart below compares the historical Sharpe Ratios of SWSBX and FMFIX, 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

	SWSBX	FMFIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.64	2.32	-0.67
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.44	0.33	+0.11
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.53	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.77	0.62	+0.15

Drawdowns

SWSBX vs. FMFIX - Drawdown Comparison

The maximum SWSBX drawdown since its inception was -9.06%, roughly equal to the maximum FMFIX drawdown of -9.35%. Use the drawdown chart below to compare losses from any high point for SWSBX and FMFIX.

Drawdown Indicators

	SWSBX	FMFIX	Difference
Max Drawdown Largest peak-to-trough decline	-9.06%	-9.35%	+0.29%
Max Drawdown (1Y) Largest decline over 1 year	-1.54%	-1.09%	-0.45%
Max Drawdown (3Y) Largest decline over 3 years	-1.79%	-3.72%	+1.93%
Max Drawdown (5Y) Largest decline over 5 years	-9.06%	-9.26%	+0.20%
Max Drawdown (10Y) Largest decline over 10 years	—	-9.35%	—
Current Drawdown Current decline from peak	-0.63%	-0.10%	-0.53%
Average Drawdown Average peak-to-trough decline	-1.79%	-1.22%	-0.57%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.47%	0.29%	+0.18%

Volatility

SWSBX vs. FMFIX - Volatility Comparison

Schwab Short-Term Bond Index Fund (SWSBX) has a higher volatility of 0.70% compared to RBB Free Market Fixed Income Fund (FMFIX) at 0.60%. This indicates that SWSBX's price experiences larger fluctuations and is considered to be riskier than FMFIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SWSBX	FMFIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.70%	0.60%	+0.10%
Volatility (6M) Calculated over the trailing 6-month period	1.62%	1.23%	+0.39%
Volatility (1Y) Calculated over the trailing 1-year period	2.23%	1.61%	+0.62%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.99%	2.88%	+0.11%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.47%	2.43%	+0.04%

SWSBX vs. FMFIX - Expense Ratio Comparison

SWSBX has a 0.06% expense ratio, which is lower than FMFIX's 0.68% expense ratio.

Dividends

SWSBX vs. FMFIX - Dividend Comparison

SWSBX's dividend yield for the trailing twelve months is around 4.13%, more than FMFIX's 3.64% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FMFIX RBB Free Market Fixed Income Fund	3.64%	3.49%	0.71%	2.75%	1.35%	0.37%	1.22%	1.44%	2.45%	1.25%	0.58%	0.39%
SWSBX Schwab Short-Term Bond Index Fund	4.13%	4.09%	3.66%	2.36%	1.11%	0.97%	1.82%	2.41%	2.12%	1.56%	0.00%	0.00%

Frequently Asked Questions

Can I hold both SWSBX and FMFIX in my portfolio?

SWSBX and FMFIX have a correlation of 0.72, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SWSBX or FMFIX?

SWSBX has higher volatility (0.70%) compared to FMFIX (0.60%). In terms of maximum drawdown, SWSBX dropped -9.06% vs FMFIX's -9.35%.

Which has better risk-adjusted returns?

FMFIX currently has the higher Sharpe Ratio (2.32 vs 1.64), 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.