PTY vs. VSTBX

Last updated Aug 1, 2026

PTY (PIMCO Corporate & Income Opportunity Fund) and VSTBX (Vanguard Short-Term Corporate Bond Index Fund Institutional Shares) are both Corporate Bonds funds. Over the past 10 years, PTY returned 8.05%/yr vs 2.93%/yr for VSTBX. Their 0.08 correlation means their historical movements had little consistent relationship. PTY charges 1.19%/yr vs 0.05%/yr for VSTBX.

Performance

PTY vs. VSTBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in PIMCO Corporate & Income Opportunity Fund (PTY) 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, PTY achieves a -2.91% return, which is significantly lower than VSTBX's 0.91% return. Over the past 10 years, PTY has outperformed VSTBX with an annualized return of 8.05%, while VSTBX has yielded a comparatively lower 2.93% annualized return.

PTY

• 1D: -0.26%
• 1M: -2.10%
• 6M: -4.67%
• YTD: -2.91%
• 1Y: -6.48%
• 3Y*: 3.48%
• 5Y*: -0.85%
• 10Y*: 8.05%
• ALL TIME*: 10.76%

VSTBX

• 1D: 0.08%
• 1M: -0.08%
• 6M: 0.53%
• YTD: 0.91%
• 1Y: 3.17%
• 3Y*: 5.54%
• 5Y*: 2.39%
• 10Y*: 2.93%
• ALL TIME*: 3.12%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
PTY PIMCO Corporate & Income Opportunity Fund	$11.02M	$11.88M	$12.18M
VSTBX Vanguard Short-Term Corporate Bond Index Fund Institutional Shares	$0.00	$0.00	$0.00

PTY vs. VSTBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PTY PIMCO Corporate & Income Opportunity Fund	-2.91%	-0.51%	19.87%	22.56%	-18.71%	0.40%	3.24%	35.36%	2.49%	26.63%
VSTBX Vanguard Short-Term Corporate Bond Index Fund Institutional Shares	0.91%	6.75%	5.37%	6.17%	-5.73%	-0.41%	5.07%	9.68%	0.92%	2.48%

Correlation

The correlation between PTY and VSTBX is 0.31, which is low. Their historical price movements had little consistent relationship.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.31
Correlation (3Y) Balances recent behavior with more history.	0.22
Correlation (5Y) Shows whether the relationship held over a longer period.	0.27
Correlation (10Y) Provides a long-term view across more market conditions.	0.15
Correlation (All Time) Calculated using the full available price history since Nov 19, 2009	0.08

Over the past year, PTY and VSTBX have become more correlated (0.31) than their long-term average of 0.08, meaning their price movements have been converging.

Return for Risk

PTY vs. VSTBX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

PTY

PTY Risk / Return Rank: 1
PTY Sharpe Ratio Rank: 1
PTY Sortino Ratio Rank: 1
PTY Omega Ratio Rank: 1
PTY Calmar Ratio Rank: 2
PTY Martin Ratio Rank: 2

VSTBX

VSTBX Risk / Return Rank: 86
VSTBX Sharpe Ratio Rank: 86
VSTBX Sortino Ratio Rank: 87
VSTBX Omega Ratio Rank: 84
VSTBX Calmar Ratio Rank: 84
VSTBX Martin Ratio Rank: 86

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

PTY vs. VSTBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for PIMCO Corporate & Income Opportunity Fund (PTY) 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.

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.

	PTY	VSTBX	Difference
Sharpe ratio: Return per unit of total volatility	-0.55	2.10	-2.66
Sortino ratio: Return per unit of downside risk	-0.68	3.17	-3.85
Omega ratio: Gain probability vs. loss probability	0.90	1.41	-0.50
Calmar ratio: Return relative to maximum drawdown	-0.40	2.84	-3.24
Martin ratio: Return relative to average drawdown	-0.70	10.89	-11.59

PTY vs. VSTBX - Sharpe Ratio Comparison

The current PTY Sharpe Ratio is -0.55, which is lower than the VSTBX Sharpe Ratio of 2.10. The chart below compares the historical Sharpe Ratios of PTY 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.

Drawdowns

PTY vs. VSTBX - Drawdown Comparison

The maximum PTY drawdown since its inception was -60.86%, which is greater than VSTBX's maximum drawdown of -9.34%. Use the drawdown chart below to compare losses from any high point for PTY and VSTBX.

Drawdown Indicators

	PTY	VSTBX	Difference
Max Drawdown Largest peak-to-trough decline	-60.86%	-9.34%	-51.52%
Max Drawdown (1Y) Largest decline over 1 year	-15.44%	-1.31%	-14.13%
Max Drawdown (3Y) Largest decline over 3 years	-15.53%	-1.31%	-14.22%
Max Drawdown (5Y) Largest decline over 5 years	-41.38%	-9.30%	-32.08%
Max Drawdown (10Y) Largest decline over 10 years	-46.55%	-9.34%	-37.21%
Current Drawdown Current decline from peak	-11.88%	-0.19%	-11.69%
Average Drawdown Average peak-to-trough decline	-8.63%	-0.95%	-7.68%
Ulcer Index Depth and duration of drawdowns from previous peaks	8.89%	0.34%	+8.55%

Volatility

PTY vs. VSTBX - Volatility Comparison

PIMCO Corporate & Income Opportunity Fund (PTY) has a higher volatility of 2.54% compared to Vanguard Short-Term Corporate Bond Index Fund Institutional Shares (VSTBX) at 0.48%. This indicates that PTY'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

	PTY	VSTBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.54%	0.48%	+2.06%
Volatility (6M) Calculated over the trailing 6-month period	7.87%	1.41%	+6.46%
Volatility (1Y) Calculated over the trailing 1-year period	11.25%	1.78%	+9.47%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.24%	2.73%	+14.51%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.18%	2.38%	+18.80%

PTY vs. VSTBX - Expense Ratio Comparison

PTY has a 1.19% expense ratio, which is higher than VSTBX's 0.05% expense ratio.

Dividends

PTY vs. VSTBX - Dividend Comparison

PTY's dividend yield for the trailing twelve months is around 12.17%, more than VSTBX's 4.07% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PTY PIMCO Corporate & Income Opportunity Fund	12.17%	11.05%	9.92%	10.77%	13.12%	9.16%	8.74%	8.37%	10.63%	9.48%	12.09%	11.92%
VSTBX Vanguard Short-Term Corporate Bond Index Fund Institutional Shares	4.07%	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 PTY and VSTBX in my portfolio?

PTY and VSTBX have a correlation of 0.31, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, PTY or VSTBX?

PTY has higher volatility (2.54%) compared to VSTBX (0.48%). In terms of maximum drawdown, PTY dropped -60.86% vs VSTBX's -9.34%.

Which has better risk-adjusted returns?

VSTBX currently has the higher Sharpe Ratio (2.10 vs -0.55), 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.