VWIAX vs. VCORX

Last updated Jun 4, 2026

VWIAX (Vanguard Wellesley Income Fund Admiral Shares) and VCORX (Vanguard Core Bond Fund Investor Shares) are both mutual funds - VWIAX is a Diversified Portfolio fund managed by Vanguard, while VCORX is a Total Bond Market fund managed by Vanguard. Over the past 10 years, VWIAX returned 5.88%/yr vs 2.17%/yr for VCORX. At a 0.46 correlation, their price movements are largely independent. VWIAX charges 0.16%/yr vs 0.20%/yr for VCORX.

Performance

VWIAX vs. VCORX - Performance Comparison

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

Returns By Period

In the year-to-date period, VWIAX achieves a 3.59% return, which is significantly higher than VCORX's 0.50% return. Over the past 10 years, VWIAX has outperformed VCORX with an annualized return of 5.88%, while VCORX has yielded a comparatively lower 2.17% annualized return.

VWIAX

• 1D: 0.30%
• 1M: 1.26%
• YTD: 3.59%
• 6M: 3.59%
• 1Y: 11.43%
• 3Y*: 8.94%
• 5Y*: 4.22%
• 10Y*: 5.88%

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%

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

VWIAX vs. VCORX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VWIAX Vanguard Wellesley Income Fund Admiral Shares	3.59%	11.08%	5.92%	7.07%	-9.04%	8.55%	8.52%	16.47%	-2.49%	9.37%
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%

Correlation

The correlation between VWIAX and VCORX is 0.64, 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	0.64
Correlation (3Y) Calculated over the trailing 3-year period	0.67
Correlation (5Y) Calculated over the trailing 5-year period	0.62
Correlation (10Y) Calculated over the trailing 10-year period	0.46
Correlation (All Time) Calculated using the full available price history since Mar 31, 2016	0.46

The correlation between VWIAX and VCORX shifts across timeframes, from 0.46 (all time) to 0.67 (3 years), reflecting how their relationship changes across market environments.

VWIAX vs. VCORX - Sectors Allocation Comparison

Sectors	VWIAX	VCORX
Financial Services	7.9%	1.0%
Healthcare	5.7%	-
Technology	4.2%	0.1%
Industrials	3.6%	-
Consumer Defensive	3.6%	-
Utilities	3.6%	-
Energy	3.1%	0.0%
Consumer Cyclical	1.9%	-
Basic Materials	1.4%	-
Real Estate	1.1%	0.0%
Communication Services	1.1%	-

Return for Risk

VWIAX vs. VCORX — Risk / Return Rank

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

VWIAX

VWIAX Risk / Return Rank: 58
VWIAX Sharpe Ratio Rank: 61
VWIAX Sortino Ratio Rank: 63
VWIAX Omega Ratio Rank: 58
VWIAX Calmar Ratio Rank: 55
VWIAX Martin Ratio Rank: 52

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

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.

VWIAX vs. VCORX - Risk-Adjusted Trends Comparison

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

	VWIAX	VCORX	Difference
Sharpe ratio: Return per unit of total volatility	2.30	1.51	+0.80
Sortino ratio: Return per unit of downside risk	3.32	2.26	+1.06
Omega ratio: Gain probability vs. loss probability	1.43	1.28	+0.15
Calmar ratio: Return relative to maximum drawdown	2.84	2.14	+0.70
Martin ratio: Return relative to average drawdown	10.69	6.47	+4.22
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VWIAX vs. VCORX - Sharpe Ratio Comparison

The current VWIAX Sharpe Ratio is 2.30, which is higher than the VCORX Sharpe Ratio of 1.51. The chart below compares the historical Sharpe Ratios of VWIAX and VCORX, 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

	VWIAX	VCORX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.30	1.51	+0.80
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.61	0.08	+0.53
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.85	0.45	+0.40
Sharpe Ratio (All Time) Calculated using the full available price history	0.94	0.48	+0.46

Drawdowns

VWIAX vs. VCORX - Drawdown Comparison

The maximum VWIAX drawdown since its inception was -21.64%, which is greater than VCORX's maximum drawdown of -18.14%. Use the drawdown chart below to compare losses from any high point for VWIAX and VCORX.

Drawdown Indicators

	VWIAX	VCORX	Difference
Max Drawdown Largest peak-to-trough decline	-21.64%	-18.14%	-3.50%
Max Drawdown (1Y) Largest decline over 1 year	-4.15%	-2.64%	-1.51%
Max Drawdown (3Y) Largest decline over 3 years	-6.96%	-5.99%	-0.97%
Max Drawdown (5Y) Largest decline over 5 years	-15.26%	-18.14%	+2.88%
Max Drawdown (10Y) Largest decline over 10 years	-17.41%	-18.14%	+0.73%
Current Drawdown Current decline from peak	0.00%	-1.28%	+1.28%
Average Drawdown Average peak-to-trough decline	-2.22%	-4.26%	+2.04%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.10%	0.87%	+0.23%

Volatility

VWIAX vs. VCORX - Volatility Comparison

Vanguard Wellesley Income Fund Admiral Shares (VWIAX) has a higher volatility of 1.66% compared to Vanguard Core Bond Fund Investor Shares (VCORX) at 1.35%. This indicates that VWIAX's price experiences larger fluctuations and is considered to be riskier than VCORX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VWIAX	VCORX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.66%	1.35%	+0.31%
Volatility (6M) Calculated over the trailing 6-month period	3.90%	2.70%	+1.20%
Volatility (1Y) Calculated over the trailing 1-year period	5.12%	3.77%	+1.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.97%	5.80%	+1.17%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	6.92%	4.80%	+2.12%

VWIAX vs. VCORX - Expense Ratio Comparison

VWIAX has a 0.16% expense ratio, which is lower than VCORX's 0.20% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

VWIAX vs. VCORX - Dividend Comparison

VWIAX's dividend yield for the trailing twelve months is around 7.75%, more than VCORX's 4.64% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%	0.00%
VWIAX Vanguard Wellesley Income Fund Admiral Shares	7.75%	7.93%	6.69%	4.80%	7.75%	6.11%	4.37%	4.00%	7.64%	3.25%	4.07%	5.66%

Frequently Asked Questions

Can I hold both VWIAX and VCORX in my portfolio?

VWIAX and VCORX have a correlation of 0.64, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VWIAX or VCORX?

VWIAX has higher volatility (1.66%) compared to VCORX (1.35%). In terms of maximum drawdown, VWIAX dropped -21.64% vs VCORX's -18.14%.

Which has better risk-adjusted returns?

VWIAX currently has the higher Sharpe Ratio (2.30 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.