BOSOX vs. RWK

Last updated Jun 23, 2026

BOSOX (Boston Trust Small Cap Fund) and RWK (Invesco S&P MidCap 400 Revenue ETF) are both Small Cap Blend Equities funds. Over the past 10 years, BOSOX returned 10.61%/yr vs 13.16%/yr for RWK. Their correlation of 0.89 suggests significant overlap in exposure. BOSOX charges 1.00%/yr vs 0.39%/yr for RWK.

Performance

BOSOX vs. RWK - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Boston Trust Small Cap Fund (BOSOX) and Invesco S&P MidCap 400 Revenue ETF (RWK). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BOSOX achieves a 10.25% return, which is significantly lower than RWK's 14.32% return. Over the past 10 years, BOSOX has underperformed RWK with an annualized return of 10.61%, while RWK has yielded a comparatively higher 13.16% annualized return.

BOSOX

• 1D: 1.22%
• 1M: 3.92%
• YTD: 10.25%
• 6M: 7.09%
• 1Y: 12.15%
• 3Y*: 8.22%
• 5Y*: 6.17%
• 10Y*: 10.61%

RWK

• 1D: -0.04%
• 1M: 3.93%
• YTD: 14.32%
• 6M: 11.91%
• 1Y: 28.00%
• 3Y*: 17.62%
• 5Y*: 11.68%
• 10Y*: 13.16%

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

BOSOX vs. RWK - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BOSOX Boston Trust Small Cap Fund	10.25%	-4.04%	12.52%	10.09%	-9.05%	28.10%	8.27%	38.35%	-6.01%	12.24%
RWK Invesco S&P MidCap 400 Revenue ETF	14.32%	10.27%	11.94%	23.76%	-8.19%	34.31%	11.06%	28.20%	-14.65%	13.39%

Correlation

The correlation between BOSOX and RWK is 0.86, 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	0.86
Correlation (3Y) Calculated over the trailing 3-year period	0.90
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (10Y) Calculated over the trailing 10-year period	0.91
Correlation (All Time) Calculated using the full available price history since Feb 22, 2008	0.89

The correlation between BOSOX and RWK has been stable across timeframes, ranging from 0.86 to 0.91 - a consistent structural relationship.

Return for Risk

BOSOX vs. RWK — Risk / Return Rank

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

BOSOX

BOSOX Risk / Return Rank: 11
BOSOX Sharpe Ratio Rank: 10
BOSOX Sortino Ratio Rank: 11
BOSOX Omega Ratio Rank: 10
BOSOX Calmar Ratio Rank: 12
BOSOX Martin Ratio Rank: 12

RWK

RWK Risk / Return Rank: 50
RWK Sharpe Ratio Rank: 50
RWK Sortino Ratio Rank: 54
RWK Omega Ratio Rank: 47
RWK Calmar Ratio Rank: 52
RWK Martin Ratio Rank: 49

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.

BOSOX vs. RWK - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Boston Trust Small Cap Fund (BOSOX) and Invesco S&P MidCap 400 Revenue ETF (RWK). 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.

	BOSOX	RWK	Difference
Sharpe ratio: Return per unit of total volatility	0.78	1.67	-0.89
Sortino ratio: Return per unit of downside risk	1.27	2.51	-1.24
Omega ratio: Gain probability vs. loss probability	1.14	1.29	-0.15
Calmar ratio: Return relative to maximum drawdown	1.11	2.53	-1.42
Martin ratio: Return relative to average drawdown	3.34	8.11	-4.76

BOSOX vs. RWK - Sharpe Ratio Comparison

The current BOSOX Sharpe Ratio is 0.78, which is lower than the RWK Sharpe Ratio of 1.67. The chart below compares the historical Sharpe Ratios of BOSOX and RWK, 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

BOSOX vs. RWK - Drawdown Comparison

The maximum BOSOX drawdown since its inception was -51.32%, smaller than the maximum RWK drawdown of -56.49%. Use the drawdown chart below to compare losses from any high point for BOSOX and RWK.

Drawdown Indicators

	BOSOX	RWK	Difference
Max Drawdown Largest peak-to-trough decline	-51.32%	-56.49%	+5.17%
Max Drawdown (1Y) Largest decline over 1 year	-10.69%	-11.14%	+0.45%
Max Drawdown (3Y) Largest decline over 3 years	-22.36%	-24.58%	+2.22%
Max Drawdown (5Y) Largest decline over 5 years	-22.36%	-24.58%	+2.22%
Max Drawdown (10Y) Largest decline over 10 years	-36.79%	-46.20%	+9.41%
Current Drawdown Current decline from peak	-3.50%	-1.45%	-2.05%
Average Drawdown Average peak-to-trough decline	-7.27%	-7.53%	+0.26%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.54%	3.46%	+0.08%

Volatility

BOSOX vs. RWK - Volatility Comparison

Boston Trust Small Cap Fund (BOSOX) and Invesco S&P MidCap 400 Revenue ETF (RWK) have volatilities of 4.20% and 4.32%, 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

	BOSOX	RWK	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.20%	4.32%	-0.12%
Volatility (6M) Calculated over the trailing 6-month period	10.25%	12.11%	-1.86%
Volatility (1Y) Calculated over the trailing 1-year period	15.20%	16.84%	-1.64%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.84%	21.09%	-3.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.57%	22.97%	-3.40%

BOSOX vs. RWK - Expense Ratio Comparison

BOSOX has a 1.00% expense ratio, which is higher than RWK's 0.39% expense ratio.

Dividends

BOSOX vs. RWK - Dividend Comparison

BOSOX's dividend yield for the trailing twelve months is around 4.00%, more than RWK's 1.36% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BOSOX Boston Trust Small Cap Fund	4.00%	4.41%	6.52%	0.78%	5.09%	8.93%	2.56%	12.46%	16.19%	9.13%	3.14%	18.92%
RWK Invesco S&P MidCap 400 Revenue ETF	1.36%	1.25%	1.11%	1.05%	1.18%	0.85%	0.96%	1.09%	1.22%	0.99%	1.30%	0.92%

Frequently Asked Questions

Can I hold both BOSOX and RWK in my portfolio?

BOSOX and RWK have a correlation of 0.86, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BOSOX or RWK?

RWK has higher volatility (4.32%) compared to BOSOX (4.20%). In terms of maximum drawdown, BOSOX dropped -51.32% vs RWK's -56.49%.

Which has better risk-adjusted returns?

RWK currently has the higher Sharpe Ratio (1.67 vs 0.78), 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.