COSYX vs. COSZX

Last updated Jun 4, 2026

COSYX (Columbia Overseas Value Fund Institutional 3 Class) and COSZX (Columbia Overseas Value Fund) are both Foreign Large Cap Equities funds from Columbia. Over the past 10 years, COSYX returned 10.37%/yr vs 10.22%/yr for COSZX. With a 1.00 correlation, they move nearly in lockstep. COSYX charges 0.77%/yr vs 0.90%/yr for COSZX.

Performance

COSYX vs. COSZX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Columbia Overseas Value Fund Institutional 3 Class (COSYX) and Columbia Overseas Value Fund (COSZX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with COSYX having a 7.43% return and COSZX slightly higher at 7.46%. Both investments have delivered pretty close results over the past 10 years, with COSYX having a 10.37% annualized return and COSZX not far behind at 10.22%.

COSYX

• 1D: 0.53%
• 1M: 0.93%
• YTD: 7.43%
• 6M: 10.20%
• 1Y: 28.17%
• 3Y*: 21.96%
• 5Y*: 11.58%
• 10Y*: 10.37%

COSZX

• 1D: 0.53%
• 1M: 0.93%
• YTD: 7.46%
• 6M: 10.18%
• 1Y: 28.08%
• 3Y*: 21.79%
• 5Y*: 11.46%
• 10Y*: 10.22%

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

COSYX vs. COSZX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
COSYX Columbia Overseas Value Fund Institutional 3 Class	7.43%	45.97%	4.87%	16.28%	-5.91%	10.98%	-0.05%	22.64%	-16.64%	27.80%
COSZX Columbia Overseas Value Fund	7.46%	45.80%	4.70%	16.05%	-5.99%	10.78%	-0.07%	22.37%	-16.70%	27.82%

Correlation

The correlation between COSYX and COSZX is 1.00 - 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	1.00
Correlation (3Y) Calculated over the trailing 3-year period	1.00
Correlation (5Y) Calculated over the trailing 5-year period	1.00
Correlation (10Y) Calculated over the trailing 10-year period	1.00
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	1.00

The correlation between COSYX and COSZX has been stable across timeframes, ranging from 1.00 to 1.00 - a consistent structural relationship.

Return for Risk

COSYX vs. COSZX — Risk / Return Rank

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

COSYX

COSYX Risk / Return Rank: 42
COSYX Sharpe Ratio Rank: 46
COSYX Sortino Ratio Rank: 43
COSYX Omega Ratio Rank: 44
COSYX Calmar Ratio Rank: 38
COSYX Martin Ratio Rank: 37

COSZX

COSZX Risk / Return Rank: 41
COSZX Sharpe Ratio Rank: 45
COSZX Sortino Ratio Rank: 43
COSZX Omega Ratio Rank: 45
COSZX Calmar Ratio Rank: 37
COSZX Martin Ratio Rank: 37

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.

COSYX vs. COSZX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Columbia Overseas Value Fund Institutional 3 Class (COSYX) and Columbia Overseas Value Fund (COSZX). 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.

	COSYX	COSZX	Difference
Sharpe ratio: Return per unit of total volatility	1.99	1.98	+0.02
Sortino ratio: Return per unit of downside risk	2.76	2.74	+0.02
Omega ratio: Gain probability vs. loss probability	1.36	1.36	0.00
Calmar ratio: Return relative to maximum drawdown	2.32	2.30	+0.02
Martin ratio: Return relative to average drawdown	8.16	8.12	+0.05
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

COSYX vs. COSZX - Sharpe Ratio Comparison

The current COSYX Sharpe Ratio is 1.99, which is comparable to the COSZX Sharpe Ratio of 1.98. The chart below compares the historical Sharpe Ratios of COSYX and COSZX, 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

	COSYX	COSZX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.99	1.98	+0.02
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.73	0.73	+0.01
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.60	0.59	+0.01
Sharpe Ratio (All Time) Calculated using the full available price history	0.57	0.21	+0.36

Drawdowns

COSYX vs. COSZX - Drawdown Comparison

The maximum COSYX drawdown since its inception was -43.16%, smaller than the maximum COSZX drawdown of -63.37%. Use the drawdown chart below to compare losses from any high point for COSYX and COSZX.

Drawdown Indicators

	COSYX	COSZX	Difference
Max Drawdown Largest peak-to-trough decline	-43.16%	-63.37%	+20.21%
Max Drawdown (1Y) Largest decline over 1 year	-11.76%	-11.76%	0.00%
Max Drawdown (3Y) Largest decline over 3 years	-13.32%	-13.34%	+0.02%
Max Drawdown (5Y) Largest decline over 5 years	-25.80%	-25.77%	-0.03%
Max Drawdown (10Y) Largest decline over 10 years	-43.16%	-43.40%	+0.24%
Current Drawdown Current decline from peak	-4.53%	-4.51%	-0.02%
Average Drawdown Average peak-to-trough decline	-7.11%	-17.90%	+10.79%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.34%	3.33%	+0.01%

Volatility

COSYX vs. COSZX - Volatility Comparison

Columbia Overseas Value Fund Institutional 3 Class (COSYX) and Columbia Overseas Value Fund (COSZX) have volatilities of 3.62% and 3.56%, 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

	COSYX	COSZX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.62%	3.56%	+0.06%
Volatility (6M) Calculated over the trailing 6-month period	10.94%	10.95%	-0.01%
Volatility (1Y) Calculated over the trailing 1-year period	13.75%	13.77%	-0.02%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.84%	15.84%	0.00%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.45%	17.45%	0.00%

COSYX vs. COSZX - Expense Ratio Comparison

COSYX has a 0.77% expense ratio, which is lower than COSZX's 0.90% expense ratio.

Dividends

COSYX vs. COSZX - Dividend Comparison

COSYX's dividend yield for the trailing twelve months is around 7.50%, more than COSZX's 7.36% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
COSYX Columbia Overseas Value Fund Institutional 3 Class	7.50%	8.05%	5.55%	4.11%	2.00%	3.75%	1.82%	3.97%	3.75%	1.71%	2.20%	0.00%
COSZX Columbia Overseas Value Fund	7.36%	7.91%	5.38%	3.97%	1.88%	3.59%	1.69%	3.82%	3.59%	1.71%	1.99%	2.27%

Frequently Asked Questions

Can I hold both COSYX and COSZX in my portfolio?

With a correlation of 1.00, COSYX and COSZX 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, COSYX or COSZX?

COSYX has higher volatility (3.62%) compared to COSZX (3.56%). In terms of maximum drawdown, COSYX dropped -43.16% vs COSZX's -63.37%.

Which has better risk-adjusted returns?

COSYX currently has the higher Sharpe Ratio (1.99 vs 1.98), 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.