COTZX vs. VWINX

Last updated Jun 24, 2026

COTZX (Columbia Thermostat Fund) and VWINX (Vanguard Wellesley Income Fund Investor Shares) are both mutual funds - COTZX is a Tactical Allocation fund managed by Columbia, while VWINX is a Diversified Portfolio fund actively managed by Vanguard. Over the past 10 years, COTZX returned 7.45%/yr vs 5.81%/yr for VWINX. A 0.79 correlation means they provide meaningful diversification when combined. COTZX charges 0.24%/yr vs 0.22%/yr for VWINX.

Performance

COTZX vs. VWINX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Columbia Thermostat Fund (COTZX) and Vanguard Wellesley Income Fund Investor Shares (VWINX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, COTZX achieves a 2.76% return, which is significantly lower than VWINX's 3.15% return. Over the past 10 years, COTZX has outperformed VWINX with an annualized return of 7.45%, while VWINX has yielded a comparatively lower 5.81% annualized return.

COTZX

• 1D: -0.33%
• 1M: 0.38%
• YTD: 2.76%
• 6M: 2.58%
• 1Y: 10.68%
• 3Y*: 10.37%
• 5Y*: 4.55%
• 10Y*: 7.45%

VWINX

• 1D: -0.23%
• 1M: 0.22%
• YTD: 3.15%
• 6M: 2.98%
• 1Y: 9.70%
• 3Y*: 8.65%
• 5Y*: 4.15%
• 10Y*: 5.81%

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

COTZX vs. VWINX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
COTZX Columbia Thermostat Fund	2.76%	15.02%	7.98%	11.66%	-12.92%	6.44%	29.61%	15.15%	-1.17%	3.33%
VWINX Vanguard Wellesley Income Fund Investor Shares	3.15%	10.98%	5.86%	6.99%	-9.09%	8.48%	8.44%	16.39%	-2.54%	9.29%

Correlation

The correlation between COTZX and VWINX is 0.77, 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	0.77
Correlation (3Y) Calculated over the trailing 3-year period	0.81
Correlation (5Y) Calculated over the trailing 5-year period	0.82
Correlation (10Y) Calculated over the trailing 10-year period	0.79
Correlation (All Time) Calculated using the full available price history since Sep 26, 2002	0.79

The correlation between COTZX and VWINX has been stable across timeframes, ranging from 0.77 to 0.82 - a consistent structural relationship.

Return for Risk

COTZX vs. VWINX — Risk / Return Rank

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

COTZX

COTZX Risk / Return Rank: 64
COTZX Sharpe Ratio Rank: 60
COTZX Sortino Ratio Rank: 66
COTZX Omega Ratio Rank: 64
COTZX Calmar Ratio Rank: 58
COTZX Martin Ratio Rank: 72

VWINX

VWINX Risk / Return Rank: 49
VWINX Sharpe Ratio Rank: 51
VWINX Sortino Ratio Rank: 53
VWINX Omega Ratio Rank: 50
VWINX Calmar Ratio Rank: 45
VWINX Martin Ratio Rank: 46

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.

COTZX vs. VWINX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Columbia Thermostat Fund (COTZX) and Vanguard Wellesley Income Fund Investor Shares (VWINX). 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.

	COTZX	VWINX	Difference
Sharpe ratio: Return per unit of total volatility	2.10	1.96	+0.14
Sortino ratio: Return per unit of downside risk	3.09	2.82	+0.27
Omega ratio: Gain probability vs. loss probability	1.41	1.35	+0.05
Calmar ratio: Return relative to maximum drawdown	2.80	2.45	+0.36
Martin ratio: Return relative to average drawdown	12.88	9.19	+3.69

COTZX vs. VWINX - Sharpe Ratio Comparison

The current COTZX Sharpe Ratio is 2.10, which is comparable to the VWINX Sharpe Ratio of 1.96. The chart below compares the historical Sharpe Ratios of COTZX and VWINX, 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

COTZX vs. VWINX - Drawdown Comparison

The maximum COTZX drawdown since its inception was -47.48%, which is greater than VWINX's maximum drawdown of -21.72%. Use the drawdown chart below to compare losses from any high point for COTZX and VWINX.

Drawdown Indicators

	COTZX	VWINX	Difference
Max Drawdown Largest peak-to-trough decline	-47.48%	-21.72%	-25.76%
Max Drawdown (1Y) Largest decline over 1 year	-4.02%	-4.16%	+0.14%
Max Drawdown (3Y) Largest decline over 3 years	-6.93%	-6.98%	+0.05%
Max Drawdown (5Y) Largest decline over 5 years	-17.80%	-15.30%	-2.50%
Max Drawdown (10Y) Largest decline over 10 years	-17.80%	-17.43%	-0.37%
Current Drawdown Current decline from peak	-0.71%	-0.58%	-0.13%
Average Drawdown Average peak-to-trough decline	-3.46%	-2.63%	-0.83%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.87%	1.11%	-0.24%

Volatility

COTZX vs. VWINX - Volatility Comparison

Columbia Thermostat Fund (COTZX) has a higher volatility of 2.19% compared to Vanguard Wellesley Income Fund Investor Shares (VWINX) at 1.60%. This indicates that COTZX's price experiences larger fluctuations and is considered to be riskier than VWINX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	COTZX	VWINX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.19%	1.60%	+0.59%
Volatility (6M) Calculated over the trailing 6-month period	4.39%	3.93%	+0.46%
Volatility (1Y) Calculated over the trailing 1-year period	5.37%	5.21%	+0.16%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	7.39%	6.99%	+0.40%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	7.42%	6.93%	+0.49%

COTZX vs. VWINX - Expense Ratio Comparison

COTZX has a 0.24% expense ratio, which is higher than VWINX's 0.22% 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

COTZX vs. VWINX - Dividend Comparison

COTZX's dividend yield for the trailing twelve months is around 3.27%, less than VWINX's 7.80% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
COTZX Columbia Thermostat Fund	3.27%	3.37%	3.55%	2.74%	3.28%	14.82%	6.92%	5.57%	4.45%	3.13%	2.66%	4.26%
VWINX Vanguard Wellesley Income Fund Investor Shares	7.80%	7.86%	6.61%	4.73%	7.67%	6.03%	4.30%	3.94%	7.56%	3.20%	4.00%	5.60%

Frequently Asked Questions

Can I hold both COTZX and VWINX in my portfolio?

COTZX and VWINX have a correlation of 0.77, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, COTZX or VWINX?

COTZX has higher volatility (2.19%) compared to VWINX (1.60%). In terms of maximum drawdown, COTZX dropped -47.48% vs VWINX's -21.72%.

Which has better risk-adjusted returns?

COTZX currently has the higher Sharpe Ratio (2.10 vs 1.96), 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.