MSIGX vs. RCKSX

Last updated Jul 14, 2026

MSIGX (Invesco Main Street Fund) and RCKSX (Rock Oak Core Growth Fund) are both Large Cap Blend Equities funds. Over the past 10 years, MSIGX returned 11.72%/yr vs 11.18%/yr for RCKSX. Their correlation of 0.86 suggests significant overlap in exposure. MSIGX charges 0.82%/yr vs 1.25%/yr for RCKSX.

Performance

MSIGX vs. RCKSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco Main Street Fund (MSIGX) and Rock Oak Core Growth Fund (RCKSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MSIGX achieves a 7.85% return, which is significantly lower than RCKSX's 19.47% return. Both investments have delivered pretty close results over the past 10 years, with MSIGX having a 11.72% annualized return and RCKSX not far behind at 11.18%.

MSIGX

• 1D: 0.57%
• 1M: 3.04%
• 6M: 6.39%
• YTD: 7.85%
• 1Y: 15.79%
• 3Y*: 17.69%
• 5Y*: 10.39%
• 10Y*: 11.72%

RCKSX

• 1D: 0.16%
• 1M: 3.07%
• 6M: 13.86%
• YTD: 19.47%
• 1Y: 23.10%
• 3Y*: 19.13%
• 5Y*: 8.56%
• 10Y*: 11.18%

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

MSIGX vs. RCKSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MSIGX Invesco Main Street Fund	7.85%	16.02%	23.66%	23.06%	-20.21%	27.37%	14.41%	22.49%	-8.25%	16.79%
RCKSX Rock Oak Core Growth Fund	19.47%	12.99%	15.12%	15.57%	-18.09%	9.96%	13.75%	19.05%	-2.14%	22.69%

Correlation

The correlation between MSIGX and RCKSX is 0.47, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.47
Correlation (3Y) Calculated over the trailing 3-year period	0.65
Correlation (5Y) Calculated over the trailing 5-year period	0.77
Correlation (10Y) Calculated over the trailing 10-year period	0.81
Correlation (All Time) Calculated using the full available price history since Jan 3, 2005	0.86

Over the past year, the correlation between MSIGX and RCKSX has dropped to 0.47 - well below their long-term average of 0.86, suggesting their price drivers have been diverging.

Return for Risk

MSIGX vs. RCKSX — Risk / Return Rank

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

MSIGX

MSIGX Risk / Return Rank: 35
MSIGX Sharpe Ratio Rank: 37
MSIGX Sortino Ratio Rank: 37
MSIGX Omega Ratio Rank: 37
MSIGX Calmar Ratio Rank: 29
MSIGX Martin Ratio Rank: 36

RCKSX

RCKSX Risk / Return Rank: 80
RCKSX Sharpe Ratio Rank: 74
RCKSX Sortino Ratio Rank: 74
RCKSX Omega Ratio Rank: 61
RCKSX Calmar Ratio Rank: 97
RCKSX Martin Ratio Rank: 93

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.

MSIGX vs. RCKSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco Main Street Fund (MSIGX) and Rock Oak Core Growth Fund (RCKSX). 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.

	MSIGX	RCKSX	Difference
Sharpe ratio: Return per unit of total volatility	1.33	1.92	-0.59
Sortino ratio: Return per unit of downside risk	1.95	2.75	-0.80
Omega ratio: Gain probability vs. loss probability	1.24	1.32	-0.08
Calmar ratio: Return relative to maximum drawdown	1.57	5.35	-3.78
Martin ratio: Return relative to average drawdown	6.27	14.95	-8.68

MSIGX vs. RCKSX - Sharpe Ratio Comparison

The current MSIGX Sharpe Ratio is 1.33, which is lower than the RCKSX Sharpe Ratio of 1.92. The chart below compares the historical Sharpe Ratios of MSIGX and RCKSX, 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

MSIGX vs. RCKSX - Drawdown Comparison

The maximum MSIGX drawdown since its inception was -57.22%, roughly equal to the maximum RCKSX drawdown of -57.88%. Use the drawdown chart below to compare losses from any high point for MSIGX and RCKSX.

Drawdown Indicators

	MSIGX	RCKSX	Difference
Max Drawdown Largest peak-to-trough decline	-57.22%	-57.88%	+0.66%
Max Drawdown (1Y) Largest decline over 1 year	-10.96%	-4.14%	-6.82%
Max Drawdown (3Y) Largest decline over 3 years	-19.91%	-18.22%	-1.69%
Max Drawdown (5Y) Largest decline over 5 years	-26.73%	-22.54%	-4.19%
Max Drawdown (10Y) Largest decline over 10 years	-35.41%	-33.10%	-2.31%
Current Drawdown Current decline from peak	0.00%	-0.24%	+0.24%
Average Drawdown Average peak-to-trough decline	-8.97%	-9.46%	+0.49%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.60%	1.48%	+1.12%

Volatility

MSIGX vs. RCKSX - Volatility Comparison

Invesco Main Street Fund (MSIGX) has a higher volatility of 4.40% compared to Rock Oak Core Growth Fund (RCKSX) at 2.36%. This indicates that MSIGX's price experiences larger fluctuations and is considered to be riskier than RCKSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MSIGX	RCKSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.40%	2.36%	+2.04%
Volatility (6M) Calculated over the trailing 6-month period	10.12%	7.80%	+2.32%
Volatility (1Y) Calculated over the trailing 1-year period	12.87%	11.55%	+1.32%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.01%	15.60%	+1.41%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.89%	17.41%	+0.48%

MSIGX vs. RCKSX - Expense Ratio Comparison

MSIGX has a 0.82% expense ratio, which is lower than RCKSX's 1.25% expense ratio.

Dividends

MSIGX vs. RCKSX - Dividend Comparison

MSIGX's dividend yield for the trailing twelve months is around 6.95%, more than RCKSX's 5.24% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MSIGX Invesco Main Street Fund	6.95%	7.50%	6.06%	7.40%	4.68%	19.19%	3.17%	0.89%	19.62%	7.50%	2.96%	13.79%
RCKSX Rock Oak Core Growth Fund	5.24%	6.26%	0.47%	0.71%	1.00%	4.31%	16.56%	3.18%	0.59%	5.91%	0.70%	3.21%

Frequently Asked Questions

Can I hold both MSIGX and RCKSX in my portfolio?

MSIGX and RCKSX have a correlation of 0.47, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MSIGX or RCKSX?

MSIGX has higher volatility (4.40%) compared to RCKSX (2.36%). In terms of maximum drawdown, MSIGX dropped -57.22% vs RCKSX's -57.88%.

Which has better risk-adjusted returns?

RCKSX currently has the higher Sharpe Ratio (1.92 vs 1.33), 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.