TARKX vs. COST

Last updated Apr 2, 2026

Compare and contrast key facts about Tarkio Fund (TARKX) and Costco Wholesale Corporation (COST).

TARKX is managed by Clark Fork Trust. It was launched on Jun 28, 2011.

Performance

TARKX vs. COST - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Tarkio Fund (TARKX) and Costco Wholesale Corporation (COST). The values are adjusted to include any dividend payments, if applicable.

TARKX vs. COST - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TARKX Tarkio Fund	3.13%	30.18%	21.72%	26.33%	-30.39%	24.41%	27.00%	29.54%	-23.30%	29.04%
COST Costco Wholesale Corporation	15.72%	-5.39%	39.62%	49.00%	-19.05%	51.82%	32.67%	45.70%	10.60%	22.37%

Returns By Period

In the year-to-date period, TARKX achieves a 3.13% return, which is significantly lower than COST's 15.72% return. Over the past 10 years, TARKX has underperformed COST with an annualized return of 13.42%, while COST has yielded a comparatively higher 22.28% annualized return.

TARKX

• 1D: 5.32%
• 1M: -11.53%
• YTD: 3.13%
• 6M: 11.85%
• 1Y: 48.87%
• 3Y*: 21.76%
• 5Y*: 7.94%
• 10Y*: 13.42%

COST

• 1D: 0.01%
• 1M: -0.62%
• YTD: 15.72%
• 6M: 8.94%
• 1Y: 4.99%
• 3Y*: 27.83%
• 5Y*: 24.29%
• 10Y*: 22.28%

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

Return for Risk

TARKX vs. COST — Risk / Return Rank

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

TARKX

TARKX Risk / Return Rank: 82
TARKX Sharpe Ratio Rank: 80
TARKX Sortino Ratio Rank: 80
TARKX Omega Ratio Rank: 73
TARKX Calmar Ratio Rank: 91
TARKX Martin Ratio Rank: 85

COST

COST Risk / Return Rank: 46
COST Sharpe Ratio Rank: 50
COST Sortino Ratio Rank: 41
COST Omega Ratio Rank: 40
COST Calmar Ratio Rank: 48
COST Martin Ratio Rank: 48

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.

TARKX vs. COST - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Tarkio Fund (TARKX) and Costco Wholesale Corporation (COST). 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.

	TARKX	COST	Difference
Sharpe ratio Return per unit of total volatility	1.55	0.25	+1.30
Sortino ratio Return per unit of downside risk	2.13	0.50	+1.63
Omega ratio Gain probability vs. loss probability	1.29	1.06	+0.23
Calmar ratio Return relative to maximum drawdown	2.82	0.31	+2.51
Martin ratio Return relative to average drawdown	9.30	0.61	+8.69
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TARKX vs. COST - Sharpe Ratio Comparison

The current TARKX Sharpe Ratio is 1.55, which is higher than the COST Sharpe Ratio of 0.25. The chart below compares the historical Sharpe Ratios of TARKX and COST, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	TARKX	COST	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.55	0.25	+1.30
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.01	1.08	-1.07
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.03	1.02	-0.99
Sharpe Ratio (All Time) Calculated using the full available price history	0.04	0.59	-0.56

Correlation

The correlation between TARKX and COST is 0.39, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

TARKX vs. COST - Dividend Comparison

TARKX's dividend yield for the trailing twelve months is around 5.34%, more than COST's 0.52% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
TARKX Tarkio Fund	5.34%	5.50%	1.51%	2.98%	10.62%	1.40%	0.50%	5.21%	3.34%	1.70%	0.47%	0.36%
COST Costco Wholesale Corporation	0.52%	0.59%	0.49%	2.87%	0.76%	0.54%	3.38%	0.86%	1.08%	4.81%	1.09%	4.06%

Drawdowns

TARKX vs. COST - Drawdown Comparison

The maximum TARKX drawdown since its inception was -95.09%, which is greater than COST's maximum drawdown of -53.39%. Use the drawdown chart below to compare losses from any high point for TARKX and COST.

Drawdown Indicators

	TARKX	COST	Difference
Max Drawdown Largest peak-to-trough decline	-95.09%	-53.39%	-41.70%
Max Drawdown (1Y) Largest decline over 1 year	-17.33%	-19.35%	+2.02%
Max Drawdown (5Y) Largest decline over 5 years	-95.09%	-31.40%	-63.69%
Max Drawdown (10Y) Largest decline over 10 years	-95.09%	-31.40%	-63.69%
Current Drawdown Current decline from peak	-91.33%	-6.95%	-84.38%
Average Drawdown Average peak-to-trough decline	-17.02%	-13.40%	-3.62%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.25%	9.67%	-4.42%

Volatility

TARKX vs. COST - Volatility Comparison

Tarkio Fund (TARKX) has a higher volatility of 11.90% compared to Costco Wholesale Corporation (COST) at 4.38%. This indicates that TARKX's price experiences larger fluctuations and is considered to be riskier than COST based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TARKX	COST	Difference
Volatility (1M) Calculated over the trailing 1-month period	11.90%	4.38%	+7.52%
Volatility (6M) Calculated over the trailing 6-month period	21.91%	13.33%	+8.58%
Volatility (1Y) Calculated over the trailing 1-year period	32.25%	20.08%	+12.17%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	600.49%	22.51%	+577.98%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	424.90%	21.90%	+403.00%