FLCPX vs. PRBLX

Last updated Jun 3, 2026

FLCPX (Fidelity SAI U.S. Large Cap Index Fund) and PRBLX (Parnassus Core Equity Fund) are both Large Cap Blend Equities funds. Over the past 10 years, FLCPX returned 15.65%/yr vs 13.61%/yr for PRBLX. Their correlation of 0.95 suggests significant overlap in exposure. FLCPX charges 0.02%/yr vs 0.82%/yr for PRBLX.

Performance

FLCPX vs. PRBLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity SAI U.S. Large Cap Index Fund (FLCPX) and Parnassus Core Equity Fund (PRBLX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FLCPX achieves a 11.57% return, which is significantly higher than PRBLX's 6.62% return. Over the past 10 years, FLCPX has outperformed PRBLX with an annualized return of 15.65%, while PRBLX has yielded a comparatively lower 13.61% annualized return.

FLCPX

• 1D: 0.26%
• 1M: 5.23%
• YTD: 11.57%
• 6M: 11.93%
• 1Y: 29.57%
• 3Y*: 22.73%
• 5Y*: 14.18%
• 10Y*: 15.65%

PRBLX

• 1D: 0.42%
• 1M: 3.31%
• YTD: 6.62%
• 6M: 6.14%
• 1Y: 15.71%
• 3Y*: 16.52%
• 5Y*: 10.25%
• 10Y*: 13.61%

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

FLCPX vs. PRBLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FLCPX Fidelity SAI U.S. Large Cap Index Fund	11.57%	17.84%	25.08%	26.25%	-18.06%	28.61%	18.24%	31.59%	-4.38%	21.74%
PRBLX Parnassus Core Equity Fund	6.62%	11.67%	18.58%	24.97%	-18.64%	27.59%	21.21%	30.68%	-0.30%	16.63%

Correlation

The correlation between FLCPX and PRBLX is 0.93, 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	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.94
Correlation (5Y) Calculated over the trailing 5-year period	0.95
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Feb 16, 2016	0.95

The correlation between FLCPX and PRBLX has been stable across timeframes, ranging from 0.93 to 0.95 - a consistent structural relationship.

Return for Risk

FLCPX vs. PRBLX — Risk / Return Rank

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

FLCPX

FLCPX Risk / Return Rank: 75
FLCPX Sharpe Ratio Rank: 78
FLCPX Sortino Ratio Rank: 69
FLCPX Omega Ratio Rank: 69
FLCPX Calmar Ratio Rank: 75
FLCPX Martin Ratio Rank: 85

PRBLX

PRBLX Risk / Return Rank: 19
PRBLX Sharpe Ratio Rank: 21
PRBLX Sortino Ratio Rank: 20
PRBLX Omega Ratio Rank: 20
PRBLX Calmar Ratio Rank: 15
PRBLX Martin Ratio Rank: 20

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.

FLCPX vs. PRBLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity SAI U.S. Large Cap Index Fund (FLCPX) and Parnassus Core Equity Fund (PRBLX). 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.

	FLCPX	PRBLX	Difference
Sharpe ratio Return per unit of total volatility	2.56	1.36	+1.20
Sortino ratio Return per unit of downside risk	3.47	1.95	+1.52
Omega ratio Gain probability vs. loss probability	1.46	1.24	+0.22
Calmar ratio Return relative to maximum drawdown	3.44	1.42	+2.03
Martin ratio Return relative to average drawdown	16.14	5.54	+10.59
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FLCPX vs. PRBLX - Sharpe Ratio Comparison

The current FLCPX Sharpe Ratio is 2.56, which is higher than the PRBLX Sharpe Ratio of 1.36. The chart below compares the historical Sharpe Ratios of FLCPX and PRBLX, 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

	FLCPX	PRBLX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.56	1.36	+1.20
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.84	0.63	+0.20
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.87	0.79	+0.07
Sharpe Ratio (All Time) Calculated using the full available price history	0.92	0.71	+0.21

Drawdowns

FLCPX vs. PRBLX - Drawdown Comparison

The maximum FLCPX drawdown since its inception was -33.87%, smaller than the maximum PRBLX drawdown of -42.20%. Use the drawdown chart below to compare losses from any high point for FLCPX and PRBLX.

Drawdown Indicators

	FLCPX	PRBLX	Difference
Max Drawdown Largest peak-to-trough decline	-33.87%	-42.20%	+8.33%
Max Drawdown (1Y) Largest decline over 1 year	-8.89%	-11.63%	+2.74%
Max Drawdown (3Y) Largest decline over 3 years	-18.76%	-16.31%	-2.45%
Max Drawdown (5Y) Largest decline over 5 years	-24.40%	-26.31%	+1.91%
Max Drawdown (10Y) Largest decline over 10 years	-33.87%	-30.09%	-3.78%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-4.19%	-4.05%	-0.14%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.90%	2.97%	-1.07%

Volatility

FLCPX vs. PRBLX - Volatility Comparison

The current volatility for Fidelity SAI U.S. Large Cap Index Fund (FLCPX) is 2.82%, while Parnassus Core Equity Fund (PRBLX) has a volatility of 3.07%. This indicates that FLCPX experiences smaller price fluctuations and is considered to be less risky than PRBLX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FLCPX	PRBLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.82%	3.07%	-0.25%
Volatility (6M) Calculated over the trailing 6-month period	9.00%	9.12%	-0.12%
Volatility (1Y) Calculated over the trailing 1-year period	11.88%	11.80%	+0.08%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.06%	16.25%	+0.81%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.16%	17.27%	+0.89%

FLCPX vs. PRBLX - Expense Ratio Comparison

FLCPX has a 0.02% expense ratio, which is lower than PRBLX's 0.82% expense ratio.

Dividends

FLCPX vs. PRBLX - Dividend Comparison

FLCPX's dividend yield for the trailing twelve months is around 0.50%, less than PRBLX's 17.85% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FLCPX Fidelity SAI U.S. Large Cap Index Fund	0.50%	0.56%	6.11%	7.05%	11.23%	10.38%	3.93%	1.74%	2.18%	1.57%	0.76%	0.00%
PRBLX Parnassus Core Equity Fund	17.85%	19.08%	10.00%	6.01%	10.13%	7.77%	5.87%	8.02%	9.64%	7.16%	3.80%	9.62%

Frequently Asked Questions

Can I hold both FLCPX and PRBLX in my portfolio?

With a correlation of 0.93, FLCPX and PRBLX 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, FLCPX or PRBLX?

PRBLX has higher volatility (3.07%) compared to FLCPX (2.82%). In terms of maximum drawdown, FLCPX dropped -33.87% vs PRBLX's -42.20%.

Which has better risk-adjusted returns?

FLCPX currently has the higher Sharpe Ratio (2.56 vs 1.36), 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.