VCORX vs. VCOBX

Last updated Jun 4, 2026

VCORX (Vanguard Core Bond Fund Investor Shares) and VCOBX (Vanguard Core Bond Fund Admiral Shares) are both Total Bond Market funds from Vanguard. Over the past 10 years, VCORX returned 2.17%/yr vs 2.19%/yr for VCOBX. With a 0.98 correlation, they move nearly in lockstep. VCORX charges 0.20%/yr vs 0.10%/yr for VCOBX.

Performance

VCORX vs. VCOBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Core Bond Fund Investor Shares (VCORX) and Vanguard Core Bond Fund Admiral Shares (VCOBX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VCORX achieves a 0.50% return, which is significantly lower than VCOBX's 0.60% return. Both investments have delivered pretty close results over the past 10 years, with VCORX having a 2.17% annualized return and VCOBX not far ahead at 2.19%.

VCORX

• 1D: 0.00%
• 1M: 0.49%
• YTD: 0.50%
• 6M: 0.37%
• 1Y: 5.63%
• 3Y*: 4.65%
• 5Y*: 0.47%
• 10Y*: 2.17%

VCOBX

• 1D: 0.00%
• 1M: 0.56%
• YTD: 0.60%
• 6M: 0.47%
• 1Y: 5.73%
• 3Y*: 4.90%
• 5Y*: 0.65%
• 10Y*: 2.19%

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

VCORX vs. VCOBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VCORX Vanguard Core Bond Fund Investor Shares	0.50%	7.68%	2.10%	5.90%	-13.27%	-0.80%	10.19%	9.47%	-0.92%	4.34%
VCOBX Vanguard Core Bond Fund Admiral Shares	0.60%	7.73%	2.21%	6.39%	-13.13%	-1.51%	10.41%	9.64%	-0.85%	3.89%

Correlation

The correlation between VCORX and VCOBX is 0.98 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.98
Correlation (3Y) Calculated over the trailing 3-year period	0.99
Correlation (5Y) Calculated over the trailing 5-year period	0.99
Correlation (10Y) Calculated over the trailing 10-year period	0.98
Correlation (All Time) Calculated using the full available price history since Mar 31, 2016	0.98

The correlation between VCORX and VCOBX has been stable across timeframes, ranging from 0.98 to 0.99 - a consistent structural relationship.

VCORX vs. VCOBX - Sectors Allocation Comparison

Sectors	VCORX	VCOBX
Financial Services	1.0%	1.0%
Technology	0.1%	0.1%
Energy	0.0%	0.0%
Real Estate	0.0%	0.0%
Basic Materials	-	-
Communication Services	-	-
Consumer Cyclical	-	-
Consumer Defensive	-	-
Healthcare	-	-
Industrials	-	-
Utilities	-	-

Return for Risk

VCORX vs. VCOBX — Risk / Return Rank

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

VCORX

VCORX Risk / Return Rank: 29
VCORX Sharpe Ratio Rank: 28
VCORX Sortino Ratio Rank: 30
VCORX Omega Ratio Rank: 28
VCORX Calmar Ratio Rank: 33
VCORX Martin Ratio Rank: 27

VCOBX

VCOBX Risk / Return Rank: 31
VCOBX Sharpe Ratio Rank: 30
VCOBX Sortino Ratio Rank: 32
VCOBX Omega Ratio Rank: 30
VCOBX Calmar Ratio Rank: 34
VCOBX Martin Ratio Rank: 27

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.

VCORX vs. VCOBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Core Bond Fund Investor Shares (VCORX) and Vanguard Core Bond Fund Admiral Shares (VCOBX). 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.

	VCORX	VCOBX	Difference
Sharpe ratio Return per unit of total volatility	1.51	1.57	-0.06
Sortino ratio Return per unit of downside risk	2.26	2.34	-0.08
Omega ratio Gain probability vs. loss probability	1.28	1.29	-0.01
Calmar ratio Return relative to maximum drawdown	2.14	2.20	-0.06
Martin ratio Return relative to average drawdown	6.47	6.56	-0.09
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VCORX vs. VCOBX - Sharpe Ratio Comparison

The current VCORX Sharpe Ratio is 1.51, which is comparable to the VCOBX Sharpe Ratio of 1.57. The chart below compares the historical Sharpe Ratios of VCORX and VCOBX, 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

	VCORX	VCOBX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.51	1.57	-0.06
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.08	0.11	-0.03
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.45	0.46	-0.01
Sharpe Ratio (All Time) Calculated using the full available price history	0.48	0.48	-0.01

Drawdowns

VCORX vs. VCOBX - Drawdown Comparison

The maximum VCORX drawdown since its inception was -18.14%, roughly equal to the maximum VCOBX drawdown of -18.14%. Use the drawdown chart below to compare losses from any high point for VCORX and VCOBX.

Drawdown Indicators

	VCORX	VCOBX	Difference
Max Drawdown Largest peak-to-trough decline	-18.14%	-18.14%	0.00%
Max Drawdown (1Y) Largest decline over 1 year	-2.64%	-2.62%	-0.02%
Max Drawdown (3Y) Largest decline over 3 years	-5.99%	-5.63%	-0.36%
Max Drawdown (5Y) Largest decline over 5 years	-18.14%	-18.03%	-0.11%
Max Drawdown (10Y) Largest decline over 10 years	-18.14%	-18.14%	0.00%
Current Drawdown Current decline from peak	-1.28%	-1.25%	-0.03%
Average Drawdown Average peak-to-trough decline	-4.26%	-4.18%	-0.08%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.87%	0.88%	-0.01%

Volatility

VCORX vs. VCOBX - Volatility Comparison

Vanguard Core Bond Fund Investor Shares (VCORX) and Vanguard Core Bond Fund Admiral Shares (VCOBX) have volatilities of 1.35% and 1.33%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VCORX	VCOBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.35%	1.33%	+0.02%
Volatility (6M) Calculated over the trailing 6-month period	2.70%	2.66%	+0.04%
Volatility (1Y) Calculated over the trailing 1-year period	3.77%	3.68%	+0.09%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.80%	5.78%	+0.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.80%	4.76%	+0.04%

VCORX vs. VCOBX - Expense Ratio Comparison

VCORX has a 0.20% expense ratio, which is higher than VCOBX's 0.10% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

VCORX vs. VCOBX - Dividend Comparison

VCORX's dividend yield for the trailing twelve months is around 4.64%, less than VCOBX's 4.73% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
VCOBX Vanguard Core Bond Fund Admiral Shares	4.73%	4.80%	5.04%	4.44%	3.01%	1.23%	3.09%	3.08%	3.10%	2.20%	2.29%
VCORX Vanguard Core Bond Fund Investor Shares	4.64%	4.70%	4.93%	3.99%	2.90%	1.91%	2.95%	2.93%	2.98%	2.62%	2.20%

Frequently Asked Questions

Can I hold both VCORX and VCOBX in my portfolio?

With a correlation of 0.98, VCORX and VCOBX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, VCORX or VCOBX?

VCORX has higher volatility (1.35%) compared to VCOBX (1.33%). In terms of maximum drawdown, VCORX dropped -18.14% vs VCOBX's -18.14%.

Which has better risk-adjusted returns?

VCOBX currently has the higher Sharpe Ratio (1.57 vs 1.51), 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.