OAYLX vs. BKTSX

Last updated Jun 4, 2026

OAYLX (Oakmark Select Fund Advisor Class) and BKTSX (iShares Total U.S. Stock Market Index Fund Class K) are both Large Cap Blend Equities funds. OAYLX is actively managed, while BKTSX is passively managed. Over the past 5 years, OAYLX returned 8.67%/yr vs 13.12%/yr for BKTSX. Their correlation of 0.82 suggests significant overlap in exposure. OAYLX charges 0.87%/yr vs 0.02%/yr for BKTSX.

Performance

OAYLX vs. BKTSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Oakmark Select Fund Advisor Class (OAYLX) and iShares Total U.S. Stock Market Index Fund Class K (BKTSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OAYLX achieves a -0.10% return, which is significantly lower than BKTSX's 11.73% return.

OAYLX

• 1D: -1.16%
• 1M: 2.77%
• YTD: -0.10%
• 6M: 3.61%
• 1Y: 14.78%
• 3Y*: 16.02%
• 5Y*: 8.67%
• 10Y*: —

BKTSX

• 1D: 0.23%
• 1M: 5.68%
• YTD: 11.73%
• 6M: 11.61%
• 1Y: 28.67%
• 3Y*: 22.30%
• 5Y*: 13.12%
• 10Y*: 15.13%

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

OAYLX vs. BKTSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OAYLX Oakmark Select Fund Advisor Class	-0.10%	14.42%	14.30%	43.21%	-22.66%	34.60%	10.90%	27.84%	-24.76%	10.37%
BKTSX iShares Total U.S. Stock Market Index Fund Class K	11.73%	17.15%	23.83%	26.02%	-19.05%	25.56%	20.82%	31.12%	-5.37%	20.02%

Correlation

The correlation between OAYLX and BKTSX is 0.56, 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	0.56
Correlation (3Y) Calculated over the trailing 3-year period	0.71
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (All Time) Calculated using the full available price history since Jan 4, 2017	0.82

Over the past year, the correlation between OAYLX and BKTSX has dropped to 0.56 - well below their long-term average of 0.82, suggesting their price drivers have been diverging.

Return for Risk

OAYLX vs. BKTSX — Risk / Return Rank

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

OAYLX

OAYLX Risk / Return Rank: 14
OAYLX Sharpe Ratio Rank: 15
OAYLX Sortino Ratio Rank: 15
OAYLX Omega Ratio Rank: 15
OAYLX Calmar Ratio Rank: 14
OAYLX Martin Ratio Rank: 12

BKTSX

BKTSX Risk / Return Rank: 70
BKTSX Sharpe Ratio Rank: 70
BKTSX Sortino Ratio Rank: 63
BKTSX Omega Ratio Rank: 62
BKTSX Calmar Ratio Rank: 73
BKTSX Martin Ratio Rank: 82

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.

OAYLX vs. BKTSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Oakmark Select Fund Advisor Class (OAYLX) and iShares Total U.S. Stock Market Index Fund Class K (BKTSX). 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.

	OAYLX	BKTSX	Difference
Sharpe ratio: Return per unit of total volatility	1.08	2.44	-1.36
Sortino ratio: Return per unit of downside risk	1.60	3.33	-1.73
Omega ratio: Gain probability vs. loss probability	1.20	1.44	-0.24
Calmar ratio: Return relative to maximum drawdown	1.28	3.34	-2.07
Martin ratio: Return relative to average drawdown	3.38	15.37	-11.98
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OAYLX vs. BKTSX - Sharpe Ratio Comparison

The current OAYLX Sharpe Ratio is 1.08, which is lower than the BKTSX Sharpe Ratio of 2.44. The chart below compares the historical Sharpe Ratios of OAYLX and BKTSX, 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

	OAYLX	BKTSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.08	2.44	-1.36
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.44	0.76	-0.31
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.82	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.42	0.83	-0.40

Drawdowns

OAYLX vs. BKTSX - Drawdown Comparison

The maximum OAYLX drawdown since its inception was -47.35%, which is greater than BKTSX's maximum drawdown of -34.97%. Use the drawdown chart below to compare losses from any high point for OAYLX and BKTSX.

Drawdown Indicators

	OAYLX	BKTSX	Difference
Max Drawdown Largest peak-to-trough decline	-47.35%	-34.97%	-12.38%
Max Drawdown (1Y) Largest decline over 1 year	-12.47%	-8.87%	-3.60%
Max Drawdown (3Y) Largest decline over 3 years	-18.74%	-19.29%	+0.55%
Max Drawdown (5Y) Largest decline over 5 years	-27.82%	-24.98%	-2.84%
Max Drawdown (10Y) Largest decline over 10 years	—	-34.97%	—
Current Drawdown Current decline from peak	-2.62%	0.00%	-2.62%
Average Drawdown Average peak-to-trough decline	-9.70%	-4.53%	-5.17%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.69%	1.93%	+2.76%

Volatility

OAYLX vs. BKTSX - Volatility Comparison

Oakmark Select Fund Advisor Class (OAYLX) has a higher volatility of 4.20% compared to iShares Total U.S. Stock Market Index Fund Class K (BKTSX) at 2.94%. This indicates that OAYLX's price experiences larger fluctuations and is considered to be riskier than BKTSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OAYLX	BKTSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.20%	2.94%	+1.26%
Volatility (6M) Calculated over the trailing 6-month period	11.05%	9.13%	+1.92%
Volatility (1Y) Calculated over the trailing 1-year period	14.74%	12.15%	+2.59%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.59%	17.36%	+2.23%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.85%	18.41%	+3.44%

OAYLX vs. BKTSX - Expense Ratio Comparison

OAYLX has a 0.87% expense ratio, which is higher than BKTSX's 0.02% expense ratio.

Dividends

OAYLX vs. BKTSX - Dividend Comparison

OAYLX's dividend yield for the trailing twelve months is around 0.52%, less than BKTSX's 1.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
BKTSX iShares Total U.S. Stock Market Index Fund Class K	1.04%	1.14%	1.27%	1.46%	1.64%	1.58%	1.51%	2.15%	2.49%	2.17%	1.54%
OAYLX Oakmark Select Fund Advisor Class	0.52%	0.52%	0.44%	0.62%	0.46%	0.70%	0.25%	0.81%	5.29%	0.44%	0.00%

Frequently Asked Questions

Can I hold both OAYLX and BKTSX in my portfolio?

OAYLX and BKTSX have a correlation of 0.56, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OAYLX or BKTSX?

OAYLX has higher volatility (4.20%) compared to BKTSX (2.94%). In terms of maximum drawdown, OAYLX dropped -47.35% vs BKTSX's -34.97%.

Which has better risk-adjusted returns?

BKTSX currently has the higher Sharpe Ratio (2.44 vs 1.08), 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.