PNIGX vs. WFSPX

Last updated Jun 24, 2026

PNIGX (BlackRock U.S. Government Bond Portfolio) and WFSPX (iShares S&P 500 Index Fund Class K) are both mutual funds - PNIGX is a Government Bonds fund managed by BlackRock, while WFSPX is a S&P 500 fund tracking the S&P 500 Index. At a correlation of -0.10, they often move in opposite directions. PNIGX charges 0.45%/yr vs 0.03%/yr for WFSPX.

Performance

PNIGX vs. WFSPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in BlackRock U.S. Government Bond Portfolio (PNIGX) and iShares S&P 500 Index Fund Class K (WFSPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

PNIGX

• 1D: —
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

WFSPX

• 1D: -0.36%
• 1M: 0.10%
• YTD: 9.77%
• 6M: 8.77%
• 1Y: 25.45%
• 3Y*: 21.35%
• 5Y*: 13.57%
• 10Y*: 15.68%

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

PNIGX vs. WFSPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PNIGX BlackRock U.S. Government Bond Portfolio	0.00%	6.68%	0.79%	4.11%	-13.73%	-1.36%	6.69%	6.88%	0.56%	1.94%
WFSPX iShares S&P 500 Index Fund Class K	9.77%	17.83%	24.94%	26.25%	-18.14%	28.63%	18.43%	31.45%	-4.83%	21.27%

Correlation

The correlation between PNIGX and WFSPX is 0.07, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.07
Correlation (3Y) Calculated over the trailing 3-year period	0.16
Correlation (5Y) Calculated over the trailing 5-year period	0.13
Correlation (10Y) Calculated over the trailing 10-year period	-0.02
Correlation (All Time) Calculated using the full available price history since Jul 2, 1993	-0.10

The correlation between PNIGX and WFSPX shifts across timeframes, from -0.10 (all time) to 0.16 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

PNIGX vs. WFSPX — Risk / Return Rank

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

PNIGX

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

WFSPX

WFSPX Risk / Return Rank: 65
WFSPX Sharpe Ratio Rank: 63
WFSPX Sortino Ratio Rank: 57
WFSPX Omega Ratio Rank: 59
WFSPX Calmar Ratio Rank: 67
WFSPX Martin Ratio Rank: 78

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.

PNIGX vs. WFSPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BlackRock U.S. Government Bond Portfolio (PNIGX) and iShares S&P 500 Index Fund Class K (WFSPX). 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.

	PNIGX	WFSPX	Difference
Sharpe ratio: Return per unit of total volatility	—	2.15	—
Sortino ratio: Return per unit of downside risk	—	2.90	—
Omega ratio: Gain probability vs. loss probability	—	1.39	—
Calmar ratio: Return relative to maximum drawdown	—	3.01	—
Martin ratio: Return relative to average drawdown	—	13.58	—

Drawdowns

Drawdown Indicators

	PNIGX	WFSPX	Difference
Max Drawdown Largest peak-to-trough decline	—	-58.21%	—
Max Drawdown (1Y) Largest decline over 1 year	—	-8.90%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-18.74%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-24.51%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-33.74%	—
Current Drawdown Current decline from peak	—	-1.72%	—
Average Drawdown Average peak-to-trough decline	—	-12.76%	—
Ulcer Index Depth and duration of drawdowns from previous peaks	—	1.97%	—

Volatility

Volatility by Period

	PNIGX	WFSPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	4.67%	—
Volatility (6M) Calculated over the trailing 6-month period	—	9.83%	—
Volatility (1Y) Calculated over the trailing 1-year period	—	12.49%	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	—	16.97%	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	—	18.07%	—

PNIGX vs. WFSPX - Expense Ratio Comparison

PNIGX has a 0.45% expense ratio, which is higher than WFSPX's 0.03% expense ratio.

Dividends

PNIGX vs. WFSPX - Dividend Comparison

PNIGX's dividend yield for the trailing twelve months is around 0.98%, less than WFSPX's 1.59% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PNIGX BlackRock U.S. Government Bond Portfolio	0.98%	2.57%	3.57%	2.90%	1.95%	1.39%	1.84%	2.56%	2.59%	2.32%	2.24%	2.57%
WFSPX iShares S&P 500 Index Fund Class K	1.59%	1.72%	1.41%	1.50%	2.02%	1.82%	1.66%	1.99%	2.00%	1.62%	2.37%	2.49%

Frequently Asked Questions

Can I hold both PNIGX and WFSPX in my portfolio?

PNIGX and WFSPX have a correlation of 0.07, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.