RMBKX vs. BGSAX

Last updated Jun 23, 2026

RMBKX (RMB Mendon Financial Services Fund) and BGSAX (BlackRock Technology Opportunities Fund Investor A) are both mutual funds - RMBKX is a Financials Equities fund managed by BlackRock, while BGSAX is a Technology Equities fund managed by BlackRock. Over the past 10 years, RMBKX returned 11.00%/yr vs 25.97%/yr for BGSAX. At a 0.42 correlation, their price movements are largely independent. RMBKX charges 1.27%/yr vs 1.20%/yr for BGSAX.

Performance

RMBKX vs. BGSAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in RMB Mendon Financial Services Fund (RMBKX) and BlackRock Technology Opportunities Fund Investor A (BGSAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RMBKX achieves a 12.74% return, which is significantly lower than BGSAX's 43.57% return. Over the past 10 years, RMBKX has underperformed BGSAX with an annualized return of 11.00%, while BGSAX has yielded a comparatively higher 25.97% annualized return.

RMBKX

• 1D: 0.49%
• 1M: 4.32%
• YTD: 12.74%
• 6M: 10.66%
• 1Y: 38.99%
• 3Y*: 21.84%
• 5Y*: 8.61%
• 10Y*: 11.00%

BGSAX

• 1D: 4.46%
• 1M: 9.11%
• YTD: 43.57%
• 6M: 43.11%
• 1Y: 67.10%
• 3Y*: 38.82%
• 5Y*: 16.37%
• 10Y*: 25.97%

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

RMBKX vs. BGSAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RMBKX RMB Mendon Financial Services Fund	12.74%	12.84%	17.07%	4.56%	-19.18%	56.40%	-5.73%	22.82%	-17.13%	12.17%
BGSAX BlackRock Technology Opportunities Fund Investor A	43.57%	19.63%	40.56%	49.09%	-43.13%	8.19%	86.27%	43.84%	2.03%	49.45%

Correlation

The correlation between RMBKX and BGSAX is 0.18, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.18
Correlation (3Y) Calculated over the trailing 3-year period	0.29
Correlation (5Y) Calculated over the trailing 5-year period	0.41
Correlation (10Y) Calculated over the trailing 10-year period	0.37
Correlation (All Time) Calculated using the full available price history since Aug 3, 2012	0.42

Over the past year, the correlation between RMBKX and BGSAX has dropped to 0.18 - well below their long-term average of 0.42, suggesting their price drivers have been diverging.

Return for Risk

RMBKX vs. BGSAX — Risk / Return Rank

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

RMBKX

RMBKX Risk / Return Rank: 58
RMBKX Sharpe Ratio Rank: 50
RMBKX Sortino Ratio Rank: 47
RMBKX Omega Ratio Rank: 46
RMBKX Calmar Ratio Rank: 89
RMBKX Martin Ratio Rank: 59

BGSAX

BGSAX Risk / Return Rank: 66
BGSAX Sharpe Ratio Rank: 78
BGSAX Sortino Ratio Rank: 56
BGSAX Omega Ratio Rank: 61
BGSAX Calmar Ratio Rank: 82
BGSAX Martin Ratio Rank: 55

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.

RMBKX vs. BGSAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for RMB Mendon Financial Services Fund (RMBKX) and BlackRock Technology Opportunities Fund Investor A (BGSAX). 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.

	RMBKX	BGSAX	Difference
Sharpe ratio: Return per unit of total volatility	1.91	2.37	-0.45
Sortino ratio: Return per unit of downside risk	2.68	2.89	-0.21
Omega ratio: Gain probability vs. loss probability	1.34	1.40	-0.06
Calmar ratio: Return relative to maximum drawdown	4.16	3.57	+0.59
Martin ratio: Return relative to average drawdown	11.11	10.42	+0.69

RMBKX vs. BGSAX - Sharpe Ratio Comparison

The current RMBKX Sharpe Ratio is 1.91, which is comparable to the BGSAX Sharpe Ratio of 2.37. The chart below compares the historical Sharpe Ratios of RMBKX and BGSAX, 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

RMBKX vs. BGSAX - Drawdown Comparison

The maximum RMBKX drawdown since its inception was -55.45%, smaller than the maximum BGSAX drawdown of -73.75%. Use the drawdown chart below to compare losses from any high point for RMBKX and BGSAX.

Drawdown Indicators

	RMBKX	BGSAX	Difference
Max Drawdown Largest peak-to-trough decline	-55.45%	-73.75%	+18.30%
Max Drawdown (1Y) Largest decline over 1 year	-9.48%	-18.49%	+9.01%
Max Drawdown (3Y) Largest decline over 3 years	-24.98%	-27.75%	+2.77%
Max Drawdown (5Y) Largest decline over 5 years	-44.33%	-49.22%	+4.89%
Max Drawdown (10Y) Largest decline over 10 years	-55.45%	-49.22%	-6.23%
Current Drawdown Current decline from peak	-1.90%	-0.29%	-1.61%
Average Drawdown Average peak-to-trough decline	-11.04%	-26.33%	+15.29%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.54%	6.32%	-2.78%

Volatility

RMBKX vs. BGSAX - Volatility Comparison

The current volatility for RMB Mendon Financial Services Fund (RMBKX) is 5.35%, while BlackRock Technology Opportunities Fund Investor A (BGSAX) has a volatility of 14.41%. This indicates that RMBKX experiences smaller price fluctuations and is considered to be less risky than BGSAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RMBKX	BGSAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.35%	14.41%	-9.06%
Volatility (6M) Calculated over the trailing 6-month period	13.74%	23.82%	-10.08%
Volatility (1Y) Calculated over the trailing 1-year period	20.63%	27.87%	-7.24%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	24.82%	28.32%	-3.50%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	27.17%	26.19%	+0.98%

RMBKX vs. BGSAX - Expense Ratio Comparison

RMBKX has a 1.27% expense ratio, which is higher than BGSAX's 1.20% expense ratio.

Dividends

RMBKX vs. BGSAX - Dividend Comparison

RMBKX's dividend yield for the trailing twelve months is around 5.52%, less than BGSAX's 9.44% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
BGSAX BlackRock Technology Opportunities Fund Investor A	9.44%	13.55%	8.68%	0.00%	0.00%	7.66%	4.86%	1.50%	1.24%	8.01%	1.17%
RMBKX RMB Mendon Financial Services Fund	5.52%	6.22%	1.90%	1.29%	17.29%	1.35%	0.00%	0.85%	5.39%	6.63%	1.50%

Frequently Asked Questions

Can I hold both RMBKX and BGSAX in my portfolio?

RMBKX and BGSAX have a correlation of 0.18, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RMBKX or BGSAX?

BGSAX has higher volatility (14.41%) compared to RMBKX (5.35%). In terms of maximum drawdown, RMBKX dropped -55.45% vs BGSAX's -73.75%.

Which has better risk-adjusted returns?

BGSAX currently has the higher Sharpe Ratio (2.37 vs 1.91), 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.