ARTMX vs. POSKX

Last updated Aug 1, 2026

ARTMX (Artisan Mid Cap Fund) and POSKX (PrimeCap Odyssey Stock Fund) are both mutual funds - ARTMX is a Mid Cap Growth Equities fund managed by Artisan, while POSKX is a Large Cap Blend Equities fund managed by PRIMECAP Odyssey Funds. Over the past 10 years, ARTMX returned 10.70%/yr vs 15.51%/yr for POSKX. Their correlation of 0.85 means they have usually moved in the same direction. ARTMX charges 1.18%/yr vs 0.65%/yr for POSKX.

Performance

ARTMX vs. POSKX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Artisan Mid Cap Fund (ARTMX) and PrimeCap Odyssey Stock Fund (POSKX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ARTMX achieves a 2.35% return, which is significantly lower than POSKX's 19.75% return. Over the past 10 years, ARTMX has underperformed POSKX with an annualized return of 10.70%, while POSKX has yielded a comparatively higher 15.51% annualized return.

ARTMX

• 1D: 1.92%
• 1M: -6.22%
• 6M: 1.82%
• YTD: 2.35%
• 1Y: 9.36%
• 3Y*: 10.27%
• 5Y*: 0.25%
• 10Y*: 10.70%
• ALL TIME*: 11.62%

POSKX

• 1D: 2.24%
• 1M: -3.83%
• 6M: 14.11%
• YTD: 19.75%
• 1Y: 41.23%
• 3Y*: 21.37%
• 5Y*: 15.18%
• 10Y*: 15.51%
• ALL TIME*: 12.15%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
ARTMX Artisan Mid Cap Fund	$0.00	$0.00	$0.00
POSKX PrimeCap Odyssey Stock Fund	$0.00	$0.00	$0.00

ARTMX vs. POSKX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ARTMX Artisan Mid Cap Fund	2.35%	14.92%	11.78%	23.99%	-36.82%	10.12%	58.62%	37.97%	-4.30%	20.61%
POSKX PrimeCap Odyssey Stock Fund	19.75%	25.73%	12.77%	21.18%	-11.12%	32.48%	10.13%	27.15%	-7.19%	25.99%

Correlation

The correlation between ARTMX and POSKX is 0.80, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.80
Correlation (3Y) Balances recent behavior with more history.	0.80
Correlation (5Y) Shows whether the relationship held over a longer period.	0.81
Correlation (10Y) Provides a long-term view across more market conditions.	0.78
Correlation (All Time) Calculated using the full available price history since Nov 2, 2004	0.85

The correlation between ARTMX and POSKX has been stable across timeframes, ranging from 0.78 to 0.85 - a consistent structural relationship.

Return for Risk

ARTMX vs. POSKX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

ARTMX

ARTMX Risk / Return Rank: 13
ARTMX Sharpe Ratio Rank: 12
ARTMX Sortino Ratio Rank: 13
ARTMX Omega Ratio Rank: 12
ARTMX Calmar Ratio Rank: 14
ARTMX Martin Ratio Rank: 16

POSKX

POSKX Risk / Return Rank: 88
POSKX Sharpe Ratio Rank: 87
POSKX Sortino Ratio Rank: 85
POSKX Omega Ratio Rank: 82
POSKX Calmar Ratio Rank: 94
POSKX Martin Ratio Rank: 92

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

ARTMX vs. POSKX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Artisan Mid Cap Fund (ARTMX) and PrimeCap Odyssey Stock Fund (POSKX). 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.

	ARTMX	POSKX	Difference
Sharpe ratio: Return per unit of total volatility	0.47	2.14	-1.67
Sortino ratio: Return per unit of downside risk	0.79	3.03	-2.24
Omega ratio: Gain probability vs. loss probability	1.09	1.38	-0.29
Calmar ratio: Return relative to maximum drawdown	0.65	3.80	-3.15
Martin ratio: Return relative to average drawdown	2.28	13.00	-10.72

ARTMX vs. POSKX - Sharpe Ratio Comparison

The current ARTMX Sharpe Ratio is 0.47, which is lower than the POSKX Sharpe Ratio of 2.14. The chart below compares the historical Sharpe Ratios of ARTMX and POSKX, 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

ARTMX vs. POSKX - Drawdown Comparison

The maximum ARTMX drawdown since its inception was -57.80%, which is greater than POSKX's maximum drawdown of -50.18%. Use the drawdown chart below to compare losses from any high point for ARTMX and POSKX.

Drawdown Indicators

	ARTMX	POSKX	Difference
Max Drawdown Largest peak-to-trough decline	-57.80%	-50.18%	-7.62%
Max Drawdown (1Y) Largest decline over 1 year	-13.32%	-9.99%	-3.33%
Max Drawdown (3Y) Largest decline over 3 years	-24.65%	-20.25%	-4.40%
Max Drawdown (5Y) Largest decline over 5 years	-43.73%	-22.96%	-20.77%
Max Drawdown (10Y) Largest decline over 10 years	-43.73%	-36.88%	-6.85%
Current Drawdown Current decline from peak	-7.71%	-7.00%	-0.71%
Average Drawdown Average peak-to-trough decline	-11.96%	-6.13%	-5.83%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.80%	2.93%	+0.87%

Volatility

ARTMX vs. POSKX - Volatility Comparison

Artisan Mid Cap Fund (ARTMX) and PrimeCap Odyssey Stock Fund (POSKX) have volatilities of 5.30% and 5.45%, 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

	ARTMX	POSKX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.30%	5.45%	-0.15%
Volatility (6M) Calculated over the trailing 6-month period	15.62%	14.71%	+0.91%
Volatility (1Y) Calculated over the trailing 1-year period	18.71%	17.77%	+0.94%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	24.32%	18.17%	+6.15%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.60%	19.07%	+3.53%

ARTMX vs. POSKX - Expense Ratio Comparison

ARTMX has a 1.18% expense ratio, which is higher than POSKX's 0.65% expense ratio.

Dividends

ARTMX vs. POSKX - Dividend Comparison

ARTMX's dividend yield for the trailing twelve months is around 18.89%, less than POSKX's 22.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ARTMX Artisan Mid Cap Fund	18.89%	19.33%	15.43%	0.00%	0.29%	19.29%	14.97%	12.88%	27.63%	14.97%	9.19%	16.40%
POSKX PrimeCap Odyssey Stock Fund	22.91%	27.44%	18.13%	10.14%	12.13%	14.58%	7.85%	6.03%	3.03%	2.17%	2.93%	1.92%

Frequently Asked Questions

Can I hold both ARTMX and POSKX in my portfolio?

ARTMX and POSKX have a correlation of 0.80, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ARTMX or POSKX?

POSKX has higher volatility (5.45%) compared to ARTMX (5.30%). In terms of maximum drawdown, ARTMX dropped -57.80% vs POSKX's -50.18%.

Which has better risk-adjusted returns?

POSKX currently has the higher Sharpe Ratio (2.14 vs 0.47), 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.