MLVHX vs. BKTSX

Last updated Jun 4, 2026

MLVHX (MFS Low Volatility Equity Fund) and BKTSX (iShares Total U.S. Stock Market Index Fund Class K) are both Large Cap Blend Equities funds. Over the past 10 years, MLVHX returned 10.48%/yr vs 15.13%/yr for BKTSX. Their correlation of 0.85 suggests significant overlap in exposure. MLVHX charges 0.67%/yr vs 0.02%/yr for BKTSX.

Performance

MLVHX vs. BKTSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Low Volatility Equity Fund (MLVHX) 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, MLVHX achieves a 1.41% return, which is significantly lower than BKTSX's 11.73% return. Over the past 10 years, MLVHX has underperformed BKTSX with an annualized return of 10.48%, while BKTSX has yielded a comparatively higher 15.13% annualized return.

MLVHX

• 1D: -0.11%
• 1M: -0.94%
• YTD: 1.41%
• 6M: 1.40%
• 1Y: 7.97%
• 3Y*: 11.23%
• 5Y*: 7.76%
• 10Y*: 10.48%

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)

MLVHX vs. BKTSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MLVHX MFS Low Volatility Equity Fund	1.41%	9.96%	13.91%	12.40%	-10.84%	25.42%	11.63%	27.17%	-1.22%	16.17%
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%	21.02%

Correlation

The correlation between MLVHX and BKTSX is 0.63, 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	0.63
Correlation (3Y) Calculated over the trailing 3-year period	0.71
Correlation (5Y) Calculated over the trailing 5-year period	0.80
Correlation (10Y) Calculated over the trailing 10-year period	0.84
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	0.85

Over the past year, the correlation between MLVHX and BKTSX has dropped to 0.63 - well below their long-term average of 0.85, suggesting their price drivers have been diverging.

Return for Risk

MLVHX vs. BKTSX — Risk / Return Rank

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

MLVHX

MLVHX Risk / Return Rank: 11
MLVHX Sharpe Ratio Rank: 11
MLVHX Sortino Ratio Rank: 11
MLVHX Omega Ratio Rank: 10
MLVHX Calmar Ratio Rank: 10
MLVHX Martin Ratio Rank: 11

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.

MLVHX vs. BKTSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Low Volatility Equity Fund (MLVHX) 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.

	MLVHX	BKTSX	Difference
Sharpe ratio: Return per unit of total volatility	0.86	2.44	-1.58
Sortino ratio: Return per unit of downside risk	1.32	3.33	-2.02
Omega ratio: Gain probability vs. loss probability	1.15	1.44	-0.29
Calmar ratio: Return relative to maximum drawdown	0.99	3.34	-2.35
Martin ratio: Return relative to average drawdown	3.32	15.37	-12.05
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MLVHX vs. BKTSX - Sharpe Ratio Comparison

The current MLVHX Sharpe Ratio is 0.86, which is lower than the BKTSX Sharpe Ratio of 2.44. The chart below compares the historical Sharpe Ratios of MLVHX 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

	MLVHX	BKTSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.86	2.44	-1.58
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.51	0.76	-0.25
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.65	0.82	-0.18
Sharpe Ratio (All Time) Calculated using the full available price history	0.67	0.83	-0.16

Drawdowns

MLVHX vs. BKTSX - Drawdown Comparison

The maximum MLVHX drawdown since its inception was -34.14%, roughly equal to the maximum BKTSX drawdown of -34.97%. Use the drawdown chart below to compare losses from any high point for MLVHX and BKTSX.

Drawdown Indicators

	MLVHX	BKTSX	Difference
Max Drawdown Largest peak-to-trough decline	-34.14%	-34.97%	+0.83%
Max Drawdown (1Y) Largest decline over 1 year	-8.30%	-8.87%	+0.57%
Max Drawdown (3Y) Largest decline over 3 years	-20.92%	-19.29%	-1.63%
Max Drawdown (5Y) Largest decline over 5 years	-20.92%	-24.98%	+4.06%
Max Drawdown (10Y) Largest decline over 10 years	-34.14%	-34.97%	+0.83%
Current Drawdown Current decline from peak	-4.47%	0.00%	-4.47%
Average Drawdown Average peak-to-trough decline	-3.90%	-4.53%	+0.63%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.47%	1.93%	+0.54%

Volatility

MLVHX vs. BKTSX - Volatility Comparison

The current volatility for MFS Low Volatility Equity Fund (MLVHX) is 2.28%, while iShares Total U.S. Stock Market Index Fund Class K (BKTSX) has a volatility of 2.94%. This indicates that MLVHX experiences smaller price fluctuations and is considered to be less risky than BKTSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MLVHX	BKTSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.28%	2.94%	-0.66%
Volatility (6M) Calculated over the trailing 6-month period	7.00%	9.13%	-2.13%
Volatility (1Y) Calculated over the trailing 1-year period	9.52%	12.15%	-2.63%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.23%	17.36%	-2.13%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.22%	18.41%	-2.19%

MLVHX vs. BKTSX - Expense Ratio Comparison

MLVHX has a 0.67% expense ratio, which is higher than BKTSX's 0.02% expense ratio.

Dividends

MLVHX vs. BKTSX - Dividend Comparison

MLVHX's dividend yield for the trailing twelve months is around 15.19%, more than BKTSX's 1.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%	0.00%
MLVHX MFS Low Volatility Equity Fund	15.19%	15.40%	13.51%	6.47%	13.00%	5.33%	1.25%	1.17%	4.99%	2.23%	1.19%	1.90%

Frequently Asked Questions

Can I hold both MLVHX and BKTSX in my portfolio?

MLVHX and BKTSX have a correlation of 0.63, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MLVHX or BKTSX?

BKTSX has higher volatility (2.94%) compared to MLVHX (2.28%). In terms of maximum drawdown, MLVHX dropped -34.14% vs BKTSX's -34.97%.

Which has better risk-adjusted returns?

BKTSX currently has the higher Sharpe Ratio (2.44 vs 0.86), 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.