SPSB vs. THOPX

Last updated Jun 4, 2026

SPSB (SPDR Portfolio Short Term Corporate Bond ETF) and THOPX (Thompson Bond Fund) are both funds - SPSB is a Corporate Bonds fund tracking the Bloomberg Barclays U.S. 1-3 Year Corporate Bond Index, while THOPX is a Short-Term Bond fund managed by Thompson IM. Over the past 10 years, SPSB returned 2.63%/yr vs 4.12%/yr for THOPX. At a 0.36 correlation, their price movements are largely independent. SPSB charges 0.07%/yr vs 0.71%/yr for THOPX.

Performance

SPSB vs. THOPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in SPDR Portfolio Short Term Corporate Bond ETF (SPSB) and Thompson Bond Fund (THOPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SPSB achieves a 0.84% return, which is significantly lower than THOPX's 1.04% return. Over the past 10 years, SPSB has underperformed THOPX with an annualized return of 2.63%, while THOPX has yielded a comparatively higher 4.12% annualized return.

SPSB

• 1D: -0.07%
• 1M: 0.26%
• YTD: 0.84%
• 6M: 1.17%
• 1Y: 4.29%
• 3Y*: 5.29%
• 5Y*: 2.69%
• 10Y*: 2.63%

THOPX

• 1D: 0.09%
• 1M: 0.38%
• YTD: 1.04%
• 6M: 1.41%
• 1Y: 6.34%
• 3Y*: 9.01%
• 5Y*: 4.07%
• 10Y*: 4.12%

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

SPSB vs. THOPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SPSB SPDR Portfolio Short Term Corporate Bond ETF	0.84%	5.86%	5.25%	5.60%	-3.31%	-0.20%	3.83%	5.21%	1.45%	1.58%
THOPX Thompson Bond Fund	1.04%	7.98%	11.54%	6.98%	-7.28%	5.75%	-1.71%	5.56%	1.80%	4.75%

Correlation

The correlation between SPSB and THOPX is 0.62, 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	0.62
Correlation (3Y) Calculated over the trailing 3-year period	0.58
Correlation (5Y) Calculated over the trailing 5-year period	0.60
Correlation (10Y) Calculated over the trailing 10-year period	0.45
Correlation (All Time) Calculated using the full available price history since Dec 18, 2009	0.36

Over the past year, SPSB and THOPX have become more correlated (0.62) than their long-term average of 0.36, meaning their price movements have been converging.

Return for Risk

SPSB vs. THOPX — Risk / Return Rank

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

SPSB

SPSB Risk / Return Rank: 92
SPSB Sharpe Ratio Rank: 91
SPSB Sortino Ratio Rank: 95
SPSB Omega Ratio Rank: 95
SPSB Calmar Ratio Rank: 86
SPSB Martin Ratio Rank: 91

THOPX

THOPX Risk / Return Rank: 93
THOPX Sharpe Ratio Rank: 95
THOPX Sortino Ratio Rank: 96
THOPX Omega Ratio Rank: 95
THOPX Calmar Ratio Rank: 88
THOPX Martin Ratio Rank: 89

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.

SPSB vs. THOPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SPDR Portfolio Short Term Corporate Bond ETF (SPSB) and Thompson Bond Fund (THOPX). 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.

	SPSB	THOPX	Difference
Sharpe ratio Return per unit of total volatility	3.25	3.40	-0.14
Sortino ratio Return per unit of downside risk	5.36	5.23	+0.14
Omega ratio Gain probability vs. loss probability	1.72	1.77	-0.05
Calmar ratio Return relative to maximum drawdown	4.94	4.36	+0.58
Martin ratio Return relative to average drawdown	22.90	17.76	+5.14
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SPSB vs. THOPX - Sharpe Ratio Comparison

The current SPSB Sharpe Ratio is 3.25, which is comparable to the THOPX Sharpe Ratio of 3.40. The chart below compares the historical Sharpe Ratios of SPSB and THOPX, 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

	SPSB	THOPX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.25	3.40	-0.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	1.36	1.89	-0.53
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.86	1.87	-1.01
Sharpe Ratio (All Time) Calculated using the full available price history	0.87	1.25	-0.38

Drawdowns

SPSB vs. THOPX - Drawdown Comparison

The maximum SPSB drawdown since its inception was -11.75%, smaller than the maximum THOPX drawdown of -19.45%. Use the drawdown chart below to compare losses from any high point for SPSB and THOPX.

Drawdown Indicators

	SPSB	THOPX	Difference
Max Drawdown Largest peak-to-trough decline	-11.75%	-19.45%	+7.70%
Max Drawdown (1Y) Largest decline over 1 year	-0.87%	-1.48%	+0.61%
Max Drawdown (3Y) Largest decline over 3 years	-0.87%	-1.61%	+0.74%
Max Drawdown (5Y) Largest decline over 5 years	-5.96%	-8.00%	+2.04%
Max Drawdown (10Y) Largest decline over 10 years	-11.75%	-11.74%	-0.01%
Current Drawdown Current decline from peak	-0.14%	-0.26%	+0.12%
Average Drawdown Average peak-to-trough decline	-0.54%	-1.86%	+1.32%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.19%	0.36%	-0.17%

Volatility

SPSB vs. THOPX - Volatility Comparison

The current volatility for SPDR Portfolio Short Term Corporate Bond ETF (SPSB) is 0.35%, while Thompson Bond Fund (THOPX) has a volatility of 0.84%. This indicates that SPSB experiences smaller price fluctuations and is considered to be less risky than THOPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPSB	THOPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.35%	0.84%	-0.49%
Volatility (6M) Calculated over the trailing 6-month period	0.94%	1.58%	-0.64%
Volatility (1Y) Calculated over the trailing 1-year period	1.33%	1.90%	-0.57%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.98%	2.16%	-0.18%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.06%	2.20%	+0.86%

SPSB vs. THOPX - Expense Ratio Comparison

SPSB has a 0.07% expense ratio, which is lower than THOPX's 0.71% expense ratio.

Dividends

SPSB vs. THOPX - Dividend Comparison

SPSB's dividend yield for the trailing twelve months is around 4.41%, less than THOPX's 5.10% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SPSB SPDR Portfolio Short Term Corporate Bond ETF	4.41%	4.55%	4.85%	4.05%	1.92%	1.19%	1.94%	2.77%	2.36%	1.94%	1.65%	1.43%
THOPX Thompson Bond Fund	5.10%	4.90%	5.34%	5.88%	3.93%	3.59%	5.16%	3.48%	3.07%	3.06%	4.24%	4.58%

Frequently Asked Questions

Can I hold both SPSB and THOPX in my portfolio?

SPSB and THOPX have a correlation of 0.62, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SPSB or THOPX?

THOPX has higher volatility (0.84%) compared to SPSB (0.35%). In terms of maximum drawdown, SPSB dropped -11.75% vs THOPX's -19.45%.

Which has better risk-adjusted returns?

THOPX currently has the higher Sharpe Ratio (3.40 vs 3.25), 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.