ACCBX vs. VSTBX

Last updated Jun 4, 2026

ACCBX (Invesco Corporate Bond Fund) and VSTBX (Vanguard Short-Term Corporate Bond Index Fund Institutional Shares) are both Corporate Bonds funds. Over the past 10 years, ACCBX returned 2.96%/yr vs 3.01%/yr for VSTBX. A 0.76 correlation means they provide meaningful diversification when combined. ACCBX charges 0.72%/yr vs 0.05%/yr for VSTBX.

Performance

ACCBX vs. VSTBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco Corporate Bond Fund (ACCBX) and Vanguard Short-Term Corporate Bond Index Fund Institutional Shares (VSTBX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ACCBX achieves a 0.62% return, which is significantly lower than VSTBX's 0.73% return. Both investments have delivered pretty close results over the past 10 years, with ACCBX having a 2.96% annualized return and VSTBX not far ahead at 3.01%.

ACCBX

• 1D: 0.00%
• 1M: 0.90%
• YTD: 0.62%
• 6M: 0.56%
• 1Y: 6.46%
• 3Y*: 5.28%
• 5Y*: 0.07%
• 10Y*: 2.96%

VSTBX

• 1D: 0.00%
• 1M: 0.30%
• YTD: 0.73%
• 6M: 1.00%
• 1Y: 4.66%
• 3Y*: 5.68%
• 5Y*: 2.43%
• 10Y*: 3.01%

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

ACCBX vs. VSTBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ACCBX Invesco Corporate Bond Fund	0.62%	7.34%	2.87%	7.01%	-16.72%	0.31%	11.43%	15.78%	-4.13%	7.27%
VSTBX Vanguard Short-Term Corporate Bond Index Fund Institutional Shares	0.73%	6.75%	5.37%	6.17%	-5.73%	-0.41%	5.07%	9.68%	0.92%	2.48%

Correlation

The correlation between ACCBX and VSTBX is 0.80, 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	0.80
Correlation (3Y) Calculated over the trailing 3-year period	0.83
Correlation (5Y) Calculated over the trailing 5-year period	0.82
Correlation (10Y) Calculated over the trailing 10-year period	0.77
Correlation (All Time) Calculated using the full available price history since Nov 20, 2009	0.76

The correlation between ACCBX and VSTBX has been stable across timeframes, ranging from 0.76 to 0.83 - a consistent structural relationship.

Return for Risk

ACCBX vs. VSTBX — Risk / Return Rank

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

ACCBX

ACCBX Risk / Return Rank: 31
ACCBX Sharpe Ratio Rank: 33
ACCBX Sortino Ratio Rank: 34
ACCBX Omega Ratio Rank: 35
ACCBX Calmar Ratio Rank: 27
ACCBX Martin Ratio Rank: 28

VSTBX

VSTBX Risk / Return Rank: 81
VSTBX Sharpe Ratio Rank: 82
VSTBX Sortino Ratio Rank: 87
VSTBX Omega Ratio Rank: 81
VSTBX Calmar Ratio Rank: 78
VSTBX Martin Ratio Rank: 76

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.

ACCBX vs. VSTBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco Corporate Bond Fund (ACCBX) and Vanguard Short-Term Corporate Bond Index Fund Institutional Shares (VSTBX). 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.

	ACCBX	VSTBX	Difference
Sharpe ratio: Return per unit of total volatility	1.64	2.67	-1.03
Sortino ratio: Return per unit of downside risk	2.43	4.17	-1.73
Omega ratio: Gain probability vs. loss probability	1.31	1.54	-0.22
Calmar ratio: Return relative to maximum drawdown	1.93	3.57	-1.64
Martin ratio: Return relative to average drawdown	6.65	14.23	-7.59
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ACCBX vs. VSTBX - Sharpe Ratio Comparison

The current ACCBX Sharpe Ratio is 1.64, which is lower than the VSTBX Sharpe Ratio of 2.67. The chart below compares the historical Sharpe Ratios of ACCBX and VSTBX, 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

	ACCBX	VSTBX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.64	2.67	-1.03
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.01	0.90	-0.89
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.52	1.27	-0.75
Sharpe Ratio (All Time) Calculated using the full available price history	0.51	1.47	-0.95

Drawdowns

ACCBX vs. VSTBX - Drawdown Comparison

The maximum ACCBX drawdown since its inception was -45.26%, which is greater than VSTBX's maximum drawdown of -9.34%. Use the drawdown chart below to compare losses from any high point for ACCBX and VSTBX.

Drawdown Indicators

	ACCBX	VSTBX	Difference
Max Drawdown Largest peak-to-trough decline	-45.26%	-9.34%	-35.92%
Max Drawdown (1Y) Largest decline over 1 year	-3.46%	-1.31%	-2.15%
Max Drawdown (3Y) Largest decline over 3 years	-6.72%	-1.31%	-5.41%
Max Drawdown (5Y) Largest decline over 5 years	-23.59%	-9.34%	-14.25%
Max Drawdown (10Y) Largest decline over 10 years	-23.59%	-9.34%	-14.25%
Current Drawdown Current decline from peak	-2.72%	-0.24%	-2.48%
Average Drawdown Average peak-to-trough decline	-10.86%	-0.96%	-9.90%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.00%	0.33%	+0.67%

Volatility

ACCBX vs. VSTBX - Volatility Comparison

Invesco Corporate Bond Fund (ACCBX) has a higher volatility of 1.43% compared to Vanguard Short-Term Corporate Bond Index Fund Institutional Shares (VSTBX) at 0.57%. This indicates that ACCBX's price experiences larger fluctuations and is considered to be riskier than VSTBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ACCBX	VSTBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.43%	0.57%	+0.86%
Volatility (6M) Calculated over the trailing 6-month period	3.03%	1.27%	+1.76%
Volatility (1Y) Calculated over the trailing 1-year period	4.08%	1.76%	+2.32%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.28%	2.71%	+3.57%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.73%	2.38%	+3.35%

ACCBX vs. VSTBX - Expense Ratio Comparison

ACCBX has a 0.72% expense ratio, which is higher than VSTBX's 0.05% expense ratio.

Dividends

ACCBX vs. VSTBX - Dividend Comparison

ACCBX's dividend yield for the trailing twelve months is around 5.00%, more than VSTBX's 4.44% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACCBX Invesco Corporate Bond Fund	5.00%	4.95%	4.63%	3.78%	3.84%	4.91%	5.98%	3.67%	4.22%	4.13%	3.64%	3.88%
VSTBX Vanguard Short-Term Corporate Bond Index Fund Institutional Shares	4.44%	4.34%	4.29%	3.09%	2.00%	1.80%	2.27%	5.40%	2.67%	2.27%	1.96%	2.25%

Frequently Asked Questions

Can I hold both ACCBX and VSTBX in my portfolio?

ACCBX and VSTBX have a correlation of 0.80, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ACCBX or VSTBX?

ACCBX has higher volatility (1.43%) compared to VSTBX (0.57%). In terms of maximum drawdown, ACCBX dropped -45.26% vs VSTBX's -9.34%.

Which has better risk-adjusted returns?

VSTBX currently has the higher Sharpe Ratio (2.67 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.