PGRTX vs. VSGIX

Last updated Jun 4, 2026

PGRTX (Principal SmallCap Growth Fund I) and VSGIX (Vanguard Small-Cap Growth Index Fund Institutional Shares) are both Small Cap Growth Equities funds. Over the past 10 years, PGRTX returned 13.91%/yr vs 11.86%/yr for VSGIX. With a 0.97 correlation, they move nearly in lockstep. PGRTX charges 0.94%/yr vs 0.06%/yr for VSGIX.

Performance

PGRTX vs. VSGIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Principal SmallCap Growth Fund I (PGRTX) and Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PGRTX achieves a 19.96% return, which is significantly higher than VSGIX's 18.74% return. Over the past 10 years, PGRTX has outperformed VSGIX with an annualized return of 13.91%, while VSGIX has yielded a comparatively lower 11.86% annualized return.

PGRTX

• 1D: 1.16%
• 1M: 5.81%
• YTD: 19.96%
• 6M: 19.26%
• 1Y: 39.82%
• 3Y*: 21.31%
• 5Y*: 7.61%
• 10Y*: 13.91%

VSGIX

• 1D: 0.72%
• 1M: 6.06%
• YTD: 18.74%
• 6M: 18.16%
• 1Y: 34.12%
• 3Y*: 18.14%
• 5Y*: 6.12%
• 10Y*: 11.86%

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

PGRTX vs. VSGIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PGRTX Principal SmallCap Growth Fund I	19.96%	12.87%	22.98%	16.43%	-28.55%	7.02%	42.08%	33.64%	-5.70%	26.33%
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	18.74%	8.44%	14.95%	23.07%	-28.39%	5.70%	35.29%	32.77%	-5.70%	21.94%

Correlation

The correlation between PGRTX and VSGIX is 0.95 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.95
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.97
Correlation (10Y) Calculated over the trailing 10-year period	0.97
Correlation (All Time) Calculated using the full available price history since Dec 7, 2000	0.97

The correlation between PGRTX and VSGIX has been stable across timeframes, ranging from 0.95 to 0.97 - a consistent structural relationship.

Return for Risk

PGRTX vs. VSGIX — Risk / Return Rank

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

PGRTX

PGRTX Risk / Return Rank: 50
PGRTX Sharpe Ratio Rank: 45
PGRTX Sortino Ratio Rank: 40
PGRTX Omega Ratio Rank: 38
PGRTX Calmar Ratio Rank: 64
PGRTX Martin Ratio Rank: 63

VSGIX

VSGIX Risk / Return Rank: 48
VSGIX Sharpe Ratio Rank: 41
VSGIX Sortino Ratio Rank: 38
VSGIX Omega Ratio Rank: 35
VSGIX Calmar Ratio Rank: 68
VSGIX Martin Ratio Rank: 61

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.

PGRTX vs. VSGIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Principal SmallCap Growth Fund I (PGRTX) and Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX). 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.

	PGRTX	VSGIX	Difference
Sharpe ratio: Return per unit of total volatility	1.96	1.86	+0.10
Sortino ratio: Return per unit of downside risk	2.67	2.56	+0.11
Omega ratio: Gain probability vs. loss probability	1.33	1.31	+0.02
Calmar ratio: Return relative to maximum drawdown	3.09	3.17	-0.09
Martin ratio: Return relative to average drawdown	12.37	12.10	+0.27
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PGRTX vs. VSGIX - Sharpe Ratio Comparison

The current PGRTX Sharpe Ratio is 1.96, which is comparable to the VSGIX Sharpe Ratio of 1.86. The chart below compares the historical Sharpe Ratios of PGRTX and VSGIX, 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

	PGRTX	VSGIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.96	1.86	+0.10
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.32	0.26	+0.06
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.61	0.52	+0.09
Sharpe Ratio (All Time) Calculated using the full available price history	0.36	0.41	-0.05

Drawdowns

PGRTX vs. VSGIX - Drawdown Comparison

The maximum PGRTX drawdown since its inception was -60.60%, roughly equal to the maximum VSGIX drawdown of -58.66%. Use the drawdown chart below to compare losses from any high point for PGRTX and VSGIX.

Drawdown Indicators

	PGRTX	VSGIX	Difference
Max Drawdown Largest peak-to-trough decline	-60.60%	-58.66%	-1.94%
Max Drawdown (1Y) Largest decline over 1 year	-13.70%	-11.38%	-2.32%
Max Drawdown (3Y) Largest decline over 3 years	-27.14%	-27.47%	+0.33%
Max Drawdown (5Y) Largest decline over 5 years	-39.51%	-38.36%	-1.15%
Max Drawdown (10Y) Largest decline over 10 years	-39.51%	-38.70%	-0.81%
Current Drawdown Current decline from peak	-0.16%	0.00%	-0.16%
Average Drawdown Average peak-to-trough decline	-15.54%	-11.34%	-4.20%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.41%	2.98%	+0.43%

Volatility

PGRTX vs. VSGIX - Volatility Comparison

Principal SmallCap Growth Fund I (PGRTX) has a higher volatility of 6.29% compared to Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX) at 5.28%. This indicates that PGRTX's price experiences larger fluctuations and is considered to be riskier than VSGIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PGRTX	VSGIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.29%	5.28%	+1.01%
Volatility (6M) Calculated over the trailing 6-month period	16.67%	14.85%	+1.82%
Volatility (1Y) Calculated over the trailing 1-year period	21.57%	19.45%	+2.12%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.89%	23.56%	+0.33%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.05%	22.98%	+0.07%

PGRTX vs. VSGIX - Expense Ratio Comparison

PGRTX has a 0.94% expense ratio, which is higher than VSGIX's 0.06% expense ratio.

Dividends

PGRTX vs. VSGIX - Dividend Comparison

PGRTX's dividend yield for the trailing twelve months is around 7.66%, more than VSGIX's 0.45% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PGRTX Principal SmallCap Growth Fund I	7.66%	9.19%	15.56%	0.00%	0.82%	14.35%	4.82%	7.50%	21.37%	5.99%	3.05%	9.16%
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	0.45%	0.55%	0.55%	0.68%	0.56%	0.37%	0.45%	0.58%	0.80%	0.82%	1.09%	0.98%

Frequently Asked Questions

Can I hold both PGRTX and VSGIX in my portfolio?

With a correlation of 0.95, PGRTX and VSGIX 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, PGRTX or VSGIX?

PGRTX has higher volatility (6.29%) compared to VSGIX (5.28%). In terms of maximum drawdown, PGRTX dropped -60.60% vs VSGIX's -58.66%.

Which has better risk-adjusted returns?

PGRTX currently has the higher Sharpe Ratio (1.96 vs 1.86), 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.