COSTX vs. COSZX

Last updated Jun 6, 2026

COSTX (Columbia Overseas Core Fund Institutional 2 Class) and COSZX (Columbia Overseas Value Fund) are both Foreign Large Cap Equities funds from Columbia. Over the past 5 years, COSTX returned 8.05%/yr vs 11.19%/yr for COSZX. With a 0.96 correlation, they move nearly in lockstep. COSTX charges 0.84%/yr vs 0.90%/yr for COSZX.

Performance

COSTX vs. COSZX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Columbia Overseas Core Fund Institutional 2 Class (COSTX) and Columbia Overseas Value Fund (COSZX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, COSTX achieves a 7.99% return, which is significantly higher than COSZX's 6.76% return.

COSTX

• 1D: 0.15%
• 1M: -1.10%
• YTD: 7.99%
• 6M: 10.65%
• 1Y: 25.39%
• 3Y*: 18.80%
• 5Y*: 8.05%
• 10Y*: —

COSZX

• 1D: 0.26%
• 1M: -2.38%
• YTD: 6.76%
• 6M: 9.75%
• 1Y: 26.84%
• 3Y*: 21.61%
• 5Y*: 11.19%
• 10Y*: 10.09%

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

COSTX vs. COSZX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
COSTX Columbia Overseas Core Fund Institutional 2 Class	7.99%	38.35%	3.48%	15.63%	-14.91%	9.68%	8.74%	25.51%	-17.10%
COSZX Columbia Overseas Value Fund	6.76%	45.80%	4.70%	16.05%	-5.99%	10.78%	-0.07%	22.37%	-17.58%

Correlation

The correlation between COSTX and COSZX is 0.94, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (All Time) Calculated using the full available price history since Mar 14, 2018	0.96

The correlation between COSTX and COSZX has been stable across timeframes, ranging from 0.94 to 0.96 - a consistent structural relationship.

Return for Risk

COSTX vs. COSZX — Risk / Return Rank

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

COSTX

COSTX Risk / Return Rank: 38
COSTX Sharpe Ratio Rank: 40
COSTX Sortino Ratio Rank: 38
COSTX Omega Ratio Rank: 40
COSTX Calmar Ratio Rank: 36
COSTX Martin Ratio Rank: 37

COSZX

COSZX Risk / Return Rank: 44
COSZX Sharpe Ratio Rank: 50
COSZX Sortino Ratio Rank: 46
COSZX Omega Ratio Rank: 48
COSZX Calmar Ratio Rank: 40
COSZX Martin Ratio Rank: 38

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.

COSTX vs. COSZX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Columbia Overseas Core Fund Institutional 2 Class (COSTX) 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.

	COSTX	COSZX	Difference
Sharpe ratio: Return per unit of total volatility	1.78	1.99	-0.21
Sortino ratio: Return per unit of downside risk	2.47	2.75	-0.28
Omega ratio: Gain probability vs. loss probability	1.32	1.36	-0.04
Calmar ratio: Return relative to maximum drawdown	2.17	2.32	-0.15
Martin ratio: Return relative to average drawdown	7.99	8.08	-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.

COSTX vs. COSZX - Sharpe Ratio Comparison

The current COSTX Sharpe Ratio is 1.78, which is comparable to the COSZX Sharpe Ratio of 1.99. The chart below compares the historical Sharpe Ratios of COSTX 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

	COSTX	COSZX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.78	1.99	-0.21
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.51	0.71	-0.20
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.58	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.46	0.21	+0.25

Drawdowns

COSTX vs. COSZX - Drawdown Comparison

The maximum COSTX drawdown since its inception was -36.74%, smaller than the maximum COSZX drawdown of -63.37%. Use the drawdown chart below to compare losses from any high point for COSTX and COSZX.

Drawdown Indicators

	COSTX	COSZX	Difference
Max Drawdown Largest peak-to-trough decline	-36.74%	-63.37%	+26.63%
Max Drawdown (1Y) Largest decline over 1 year	-11.82%	-11.76%	-0.06%
Max Drawdown (3Y) Largest decline over 3 years	-13.42%	-13.34%	-0.08%
Max Drawdown (5Y) Largest decline over 5 years	-31.32%	-25.77%	-5.55%
Max Drawdown (10Y) Largest decline over 10 years	—	-43.40%	—
Current Drawdown Current decline from peak	-2.67%	-5.13%	+2.46%
Average Drawdown Average peak-to-trough decline	-7.55%	-17.89%	+10.34%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.20%	3.37%	-0.17%

Volatility

COSTX vs. COSZX - Volatility Comparison

Columbia Overseas Core Fund Institutional 2 Class (COSTX) has a higher volatility of 3.82% compared to Columbia Overseas Value Fund (COSZX) at 3.56%. This indicates that COSTX's price experiences larger fluctuations and is considered to be riskier than COSZX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	COSTX	COSZX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.82%	3.56%	+0.26%
Volatility (6M) Calculated over the trailing 6-month period	11.79%	11.00%	+0.79%
Volatility (1Y) Calculated over the trailing 1-year period	14.42%	13.72%	+0.70%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.81%	15.84%	-0.03%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.38%	17.45%	-0.07%

COSTX vs. COSZX - Expense Ratio Comparison

COSTX has a 0.84% expense ratio, which is lower than COSZX's 0.90% expense ratio.

Dividends

COSTX vs. COSZX - Dividend Comparison

COSTX's dividend yield for the trailing twelve months is around 8.90%, more than COSZX's 7.41% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
COSTX Columbia Overseas Core Fund Institutional 2 Class	8.90%	9.61%	4.31%	4.71%	1.46%	8.23%	2.34%	3.91%	1.11%	0.00%	0.00%	0.00%
COSZX Columbia Overseas Value Fund	7.41%	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 COSTX and COSZX in my portfolio?

With a correlation of 0.94, COSTX 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, COSTX or COSZX?

COSTX has higher volatility (3.82%) compared to COSZX (3.56%). In terms of maximum drawdown, COSTX dropped -36.74% vs COSZX's -63.37%.

Which has better risk-adjusted returns?

COSZX currently has the higher Sharpe Ratio (1.99 vs 1.78), 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.