PKAIX vs. VIIIX
PKAIX (PIMCO RAE US Fund) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both mutual funds - PKAIX is a Large Cap Value Equities fund managed by PIMCO, while VIIIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, PKAIX returned 13.90%/yr vs 15.65%/yr for VIIIX. Their correlation of 0.85 suggests significant overlap in exposure. PKAIX charges 0.40%/yr vs 0.02%/yr for VIIIX.
Performance
PKAIX vs. VIIIX - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, PKAIX achieves a 21.04% return, which is significantly higher than VIIIX's 10.19% return. Over the past 10 years, PKAIX has underperformed VIIIX with an annualized return of 13.90%, while VIIIX has yielded a comparatively higher 15.65% annualized return.
PKAIX
- 1D
- -0.24%
- 1M
- -0.24%
- YTD
- 21.04%
- 6M
- 17.09%
- 1Y
- 38.07%
- 3Y*
- 22.81%
- 5Y*
- 15.46%
- 10Y*
- 13.90%
VIIIX
- 1D
- 1.09%
- 1M
- 0.47%
- YTD
- 10.19%
- 6M
- 9.68%
- 1Y
- 27.18%
- 3Y*
- 21.39%
- 5Y*
- 14.24%
- 10Y*
- 15.65%
PKAIX vs. VIIIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
PKAIX PIMCO RAE US Fund | 21.04% | 17.19% | 16.28% | 17.02% | -3.36% | 27.74% | 3.94% | 24.92% | -6.92% | 16.51% |
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares | 10.19% | 17.87% | 26.29% | 25.79% | -18.14% | 28.69% | 18.41% | 31.48% | -4.41% | 21.82% |
Correlation
The correlation between PKAIX and VIIIX is 0.61, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.61 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.76 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.80 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.84 |
Correlation (All Time) Calculated using the full available price history since Jun 5, 2015 | 0.85 |
Over the past year, the correlation between PKAIX and VIIIX has dropped to 0.61 - well below their long-term average of 0.85, suggesting their price drivers have been diverging.
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
Return for Risk
PKAIX vs. VIIIX — Risk / Return Rank
PKAIX
VIIIX
PKAIX vs. VIIIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for PIMCO RAE US Fund (PKAIX) 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.
| PKAIX | VIIIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.81 | ||
| Sortino ratioReturn per unit of downside risk | +1.10 | ||
| Omega ratioGain probability vs. loss probability | 1.52 | 1.39 | +0.13 |
| Calmar ratioReturn relative to maximum drawdown | 7.61 | 3.04 | +4.57 |
| Martin ratioReturn relative to average drawdown | 22.81 | 13.74 | +9.06 |
Loading charts...
Drawdowns
PKAIX vs. VIIIX - Drawdown Comparison
The maximum PKAIX drawdown since its inception was -38.56%, smaller than the maximum VIIIX drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for PKAIX and VIIIX.
Loading charts...
Drawdown Indicators
| PKAIX | VIIIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -38.56% | -55.18% | +16.62% |
Max Drawdown (1Y)Largest decline over 1 year | -5.15% | -8.90% | +3.75% |
Max Drawdown (3Y)Largest decline over 3 years | -20.31% | -18.75% | -1.56% |
Max Drawdown (5Y)Largest decline over 5 years | -20.64% | -24.50% | +3.86% |
Max Drawdown (10Y)Largest decline over 10 years | -38.56% | -33.79% | -4.77% |
Current DrawdownCurrent decline from peak | -3.39% | -1.36% | -2.03% |
Average DrawdownAverage peak-to-trough decline | -4.70% | -10.00% | +5.30% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.71% | 1.96% | -0.25% |
Volatility
PKAIX vs. VIIIX - Volatility Comparison
The current volatility for PIMCO RAE US Fund (PKAIX) is 4.32%, while Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) has a volatility of 4.77%. This indicates that PKAIX experiences smaller price fluctuations and is considered to be less risky than VIIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| PKAIX | VIIIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.32% | 4.77% | -0.45% |
Volatility (6M)Calculated over the trailing 6-month period | 9.84% | 9.91% | -0.07% |
Volatility (1Y)Calculated over the trailing 1-year period | 13.17% | 12.47% | +0.70% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.80% | 16.99% | +0.81% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.87% | 18.10% | +0.77% |
PKAIX vs. VIIIX - Expense Ratio Comparison
PKAIX has a 0.40% expense ratio, which is higher than VIIIX's 0.02% expense ratio.
Dividends
PKAIX vs. VIIIX - Dividend Comparison
PKAIX's dividend yield for the trailing twelve months is around 11.38%, more than VIIIX's 2.44% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
PKAIX PIMCO RAE US Fund | 11.38% | 13.77% | 16.77% | 6.65% | 8.09% | 10.03% | 3.20% | 4.91% | 6.85% | 5.85% | 5.33% | 3.49% |
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares | 2.44% | 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
PKAIX and VIIIX have a correlation of 0.61, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
VIIIX has higher volatility (4.77%) compared to PKAIX (4.32%). In terms of maximum drawdown, PKAIX dropped -38.56% vs VIIIX's -55.18%.
PKAIX currently has the higher Sharpe Ratio (2.97 vs 2.17), 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.
Find the right allocation for PKAIX and VIIIX
Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.
Open Portfolio Optimizer