BCAIX vs. FSOSX

Last updated Jun 4, 2026

BCAIX (Boston Common ESG Impact International Fund) and FSOSX (Fidelity Series Overseas Fund) are both Foreign Large Cap Equities funds. Over the past 5 years, BCAIX returned 3.51%/yr vs 6.73%/yr for FSOSX. Their correlation of 0.95 suggests significant overlap in exposure. BCAIX charges 0.86%/yr vs 0.01%/yr for FSOSX.

Performance

BCAIX vs. FSOSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Boston Common ESG Impact International Fund (BCAIX) and Fidelity Series Overseas Fund (FSOSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BCAIX achieves a 9.78% return, which is significantly higher than FSOSX's 5.63% return.

BCAIX

• 1D: 0.44%
• 1M: 4.76%
• YTD: 9.78%
• 6M: 12.09%
• 1Y: 20.14%
• 3Y*: 11.98%
• 5Y*: 3.51%
• 10Y*: 7.01%

FSOSX

• 1D: 0.96%
• 1M: 3.89%
• YTD: 5.63%
• 6M: 7.55%
• 1Y: 8.98%
• 3Y*: 13.16%
• 5Y*: 6.73%
• 10Y*: —

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

BCAIX vs. FSOSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
BCAIX Boston Common ESG Impact International Fund	9.78%	25.22%	0.55%	11.55%	-21.86%	3.41%	18.56%	8.67%
FSOSX Fidelity Series Overseas Fund	5.63%	21.29%	5.87%	21.49%	-23.25%	19.59%	16.36%	7.78%

Correlation

The correlation between BCAIX and FSOSX is 0.93, 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	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (All Time) Calculated using the full available price history since Jul 1, 2019	0.95

The correlation between BCAIX and FSOSX has been stable across timeframes, ranging from 0.93 to 0.95 - a consistent structural relationship.

Return for Risk

BCAIX vs. FSOSX — Risk / Return Rank

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

BCAIX

BCAIX Risk / Return Rank: 20
BCAIX Sharpe Ratio Rank: 19
BCAIX Sortino Ratio Rank: 18
BCAIX Omega Ratio Rank: 18
BCAIX Calmar Ratio Rank: 19
BCAIX Martin Ratio Rank: 25

FSOSX

FSOSX Risk / Return Rank: 7
FSOSX Sharpe Ratio Rank: 6
FSOSX Sortino Ratio Rank: 6
FSOSX Omega Ratio Rank: 6
FSOSX Calmar Ratio Rank: 7
FSOSX Martin Ratio Rank: 8

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.

BCAIX vs. FSOSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Boston Common ESG Impact International Fund (BCAIX) and Fidelity Series Overseas Fund (FSOSX). 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.

	BCAIX	FSOSX	Difference
Sharpe ratio: Return per unit of total volatility	1.24	0.50	+0.74
Sortino ratio: Return per unit of downside risk	1.80	0.83	+0.97
Omega ratio: Gain probability vs. loss probability	1.22	1.10	+0.12
Calmar ratio: Return relative to maximum drawdown	1.60	0.68	+0.92
Martin ratio: Return relative to average drawdown	6.13	2.42	+3.71
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BCAIX vs. FSOSX - Sharpe Ratio Comparison

The current BCAIX Sharpe Ratio is 1.24, which is higher than the FSOSX Sharpe Ratio of 0.50. The chart below compares the historical Sharpe Ratios of BCAIX and FSOSX, 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

	BCAIX	FSOSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.24	0.50	+0.74
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.21	0.38	-0.17
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.42	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.31	0.51	-0.20

Drawdowns

BCAIX vs. FSOSX - Drawdown Comparison

The maximum BCAIX drawdown since its inception was -37.34%, which is greater than FSOSX's maximum drawdown of -35.36%. Use the drawdown chart below to compare losses from any high point for BCAIX and FSOSX.

Drawdown Indicators

	BCAIX	FSOSX	Difference
Max Drawdown Largest peak-to-trough decline	-37.34%	-35.36%	-1.98%
Max Drawdown (1Y) Largest decline over 1 year	-12.15%	-12.39%	+0.24%
Max Drawdown (3Y) Largest decline over 3 years	-16.34%	-14.07%	-2.27%
Max Drawdown (5Y) Largest decline over 5 years	-37.34%	-35.36%	-1.98%
Max Drawdown (10Y) Largest decline over 10 years	-37.34%	—	—
Current Drawdown Current decline from peak	0.00%	-1.31%	+1.31%
Average Drawdown Average peak-to-trough decline	-9.65%	-7.78%	-1.87%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.16%	3.46%	-0.30%

Volatility

BCAIX vs. FSOSX - Volatility Comparison

The current volatility for Boston Common ESG Impact International Fund (BCAIX) is 5.10%, while Fidelity Series Overseas Fund (FSOSX) has a volatility of 6.14%. This indicates that BCAIX experiences smaller price fluctuations and is considered to be less risky than FSOSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BCAIX	FSOSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.10%	6.14%	-1.04%
Volatility (6M) Calculated over the trailing 6-month period	12.71%	14.30%	-1.59%
Volatility (1Y) Calculated over the trailing 1-year period	15.71%	16.80%	-1.09%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.65%	17.67%	-1.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.65%	19.05%	-2.40%

BCAIX vs. FSOSX - Expense Ratio Comparison

BCAIX has a 0.86% expense ratio, which is higher than FSOSX's 0.01% expense ratio.

Dividends

BCAIX vs. FSOSX - Dividend Comparison

BCAIX's dividend yield for the trailing twelve months is around 3.48%, less than FSOSX's 8.66% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BCAIX Boston Common ESG Impact International Fund	3.48%	3.82%	2.73%	2.32%	1.26%	3.34%	0.63%	2.25%	1.42%	1.18%	1.61%	1.10%
FSOSX Fidelity Series Overseas Fund	8.66%	9.15%	2.25%	1.63%	1.80%	2.92%	1.12%	0.37%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both BCAIX and FSOSX in my portfolio?

With a correlation of 0.93, BCAIX and FSOSX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, BCAIX or FSOSX?

FSOSX has higher volatility (6.14%) compared to BCAIX (5.10%). In terms of maximum drawdown, BCAIX dropped -37.34% vs FSOSX's -35.36%.

Which has better risk-adjusted returns?

BCAIX currently has the higher Sharpe Ratio (1.24 vs 0.50), 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.