MPGFX vs. VIIIX

Last updated Jul 18, 2026

MPGFX (Mairs & Power Growth Fund) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both mutual funds - MPGFX is a Large Cap Blend Equities fund managed by Mairs & Power, while VIIIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, MPGFX returned 12.46%/yr vs 15.24%/yr for VIIIX. Their correlation of 0.92 suggests significant overlap in exposure. MPGFX charges 0.61%/yr vs 0.02%/yr for VIIIX.

Performance

MPGFX vs. VIIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Mairs & Power Growth Fund (MPGFX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with MPGFX having a 11.01% return and VIIIX slightly lower at 10.74%. Over the past 10 years, MPGFX has underperformed VIIIX with an annualized return of 12.46%, while VIIIX has yielded a comparatively higher 15.24% annualized return.

MPGFX

• 1D: 0.13%
• 1M: 3.55%
• 6M: 8.28%
• YTD: 11.01%
• 1Y: 17.75%
• 3Y*: 15.65%
• 5Y*: 10.06%
• 10Y*: 12.46%

VIIIX

• 1D: -0.51%
• 1M: 1.60%
• 6M: 9.17%
• YTD: 10.74%
• 1Y: 21.05%
• 3Y*: 20.54%
• 5Y*: 13.47%
• 10Y*: 15.24%

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

MPGFX vs. VIIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MPGFX Mairs & Power Growth Fund	11.01%	10.55%	19.61%	27.70%	-21.28%	29.42%	16.80%	28.40%	-4.27%	16.54%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	10.74%	17.87%	26.29%	25.79%	-18.14%	28.69%	18.41%	31.48%	-4.41%	21.82%

Correlation

The correlation between MPGFX and VIIIX is 0.92, 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	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.94
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Jul 7, 1997	0.92

The correlation between MPGFX and VIIIX has been stable across timeframes, ranging from 0.92 to 0.96 - a consistent structural relationship.

Return for Risk

MPGFX vs. VIIIX — Risk / Return Rank

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

MPGFX

MPGFX Risk / Return Rank: 38
MPGFX Sharpe Ratio Rank: 38
MPGFX Sortino Ratio Rank: 35
MPGFX Omega Ratio Rank: 36
MPGFX Calmar Ratio Rank: 37
MPGFX Martin Ratio Rank: 43

VIIIX

VIIIX Risk / Return Rank: 57
VIIIX Sharpe Ratio Rank: 54
VIIIX Sortino Ratio Rank: 51
VIIIX Omega Ratio Rank: 52
VIIIX Calmar Ratio Rank: 57
VIIIX Martin Ratio Rank: 70

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.

MPGFX vs. VIIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Mairs & Power Growth Fund (MPGFX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). 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.

	MPGFX	VIIIX	Difference
Sharpe ratio: Return per unit of total volatility	1.45	1.74	-0.28
Sortino ratio: Return per unit of downside risk	2.03	2.39	-0.36
Omega ratio: Gain probability vs. loss probability	1.26	1.31	-0.05
Calmar ratio: Return relative to maximum drawdown	1.95	2.45	-0.50
Martin ratio: Return relative to average drawdown	7.74	10.74	-3.00

MPGFX vs. VIIIX - Sharpe Ratio Comparison

The current MPGFX Sharpe Ratio is 1.45, which is comparable to the VIIIX Sharpe Ratio of 1.74. The chart below compares the historical Sharpe Ratios of MPGFX and VIIIX, 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

MPGFX vs. VIIIX - Drawdown Comparison

The maximum MPGFX drawdown since its inception was -61.00%, which is greater than VIIIX's maximum drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for MPGFX and VIIIX.

Drawdown Indicators

	MPGFX	VIIIX	Difference
Max Drawdown Largest peak-to-trough decline	-61.00%	-55.18%	-5.82%
Max Drawdown (1Y) Largest decline over 1 year	-9.54%	-8.90%	-0.64%
Max Drawdown (3Y) Largest decline over 3 years	-19.03%	-18.75%	-0.28%
Max Drawdown (5Y) Largest decline over 5 years	-25.87%	-24.50%	-1.37%
Max Drawdown (10Y) Largest decline over 10 years	-33.08%	-33.79%	+0.71%
Current Drawdown Current decline from peak	0.00%	-0.86%	+0.86%
Average Drawdown Average peak-to-trough decline	-14.67%	-9.98%	-4.69%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.40%	2.02%	+0.38%

Volatility

MPGFX vs. VIIIX - Volatility Comparison

Mairs & Power Growth Fund (MPGFX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) have volatilities of 3.19% and 3.26%, 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

	MPGFX	VIIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.19%	3.26%	-0.07%
Volatility (6M) Calculated over the trailing 6-month period	10.08%	10.00%	+0.08%
Volatility (1Y) Calculated over the trailing 1-year period	12.81%	12.55%	+0.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.36%	17.00%	+0.36%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.06%	18.04%	+0.02%

MPGFX vs. VIIIX - Expense Ratio Comparison

MPGFX has a 0.61% expense ratio, which is higher than VIIIX's 0.02% expense ratio.

Dividends

MPGFX vs. VIIIX - Dividend Comparison

MPGFX's dividend yield for the trailing twelve months is around 3.98%, more than VIIIX's 2.48% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MPGFX Mairs & Power Growth Fund	3.98%	4.48%	3.84%	2.34%	8.80%	8.13%	8.81%	7.39%	8.76%	9.47%	5.84%	7.92%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	2.48%	2.11%	3.66%	2.66%	3.39%	4.79%	3.07%	2.86%	2.45%	1.84%	2.38%	2.47%

Frequently Asked Questions

Can I hold both MPGFX and VIIIX in my portfolio?

With a correlation of 0.92, MPGFX and VIIIX 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, MPGFX or VIIIX?

VIIIX has higher volatility (3.26%) compared to MPGFX (3.19%). In terms of maximum drawdown, MPGFX dropped -61.00% vs VIIIX's -55.18%.

Which has better risk-adjusted returns?

VIIIX currently has the higher Sharpe Ratio (1.74 vs 1.45), 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.