STPZ vs. FXAIX

Last updated Aug 4, 2026

STPZ (PIMCO 1-5 Year US TIPS Index ETF) and FXAIX (Fidelity 500 Index Fund) are both funds - STPZ is a Inflation-Protected Bonds fund tracking the ICE BofA US Inflation-Linked Treasury (1-5 Y), while FXAIX is a S&P 500 fund tracking the S&P 500 Index. Both are passively managed. Over the past 10 years, STPZ returned 2.82%/yr vs 15.16%/yr for FXAIX. Their 0.05 correlation means their historical movements had little consistent relationship. STPZ charges 0.20%/yr vs 0.02%/yr for FXAIX.

Performance

STPZ vs. FXAIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in PIMCO 1-5 Year US TIPS Index ETF (STPZ) and Fidelity 500 Index Fund (FXAIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, STPZ achieves a 1.47% return, which is significantly lower than FXAIX's 10.13% return. Over the past 10 years, STPZ has underperformed FXAIX with an annualized return of 2.82%, while FXAIX has yielded a comparatively higher 15.16% annualized return.

STPZ

• 1D: 0.02%
• 1M: 0.06%
• 6M: 1.12%
• YTD: 1.47%
• 1Y: 2.60%
• 3Y*: 4.85%
• 5Y*: 2.62%
• 10Y*: 2.82%
• ALL TIME*: 2.41%

FXAIX

• 1D: 0.71%
• 1M: 0.15%
• 6M: 7.97%
• YTD: 10.13%
• 1Y: 21.49%
• 3Y*: 19.42%
• 5Y*: 12.84%
• 10Y*: 15.16%
• ALL TIME*: 13.94%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
FXAIX Fidelity 500 Index Fund	$0.00	$0.00	$0.00
STPZ PIMCO 1-5 Year US TIPS Index ETF	$3.45M	$3.35M	$4.10M

STPZ vs. FXAIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
STPZ PIMCO 1-5 Year US TIPS Index ETF	1.47%	6.40%	4.30%	4.28%	-4.49%	5.64%	5.44%	4.83%	0.04%	0.51%
FXAIX Fidelity 500 Index Fund	10.13%	17.84%	25.01%	26.29%	-18.14%	28.71%	18.42%	31.48%	-4.43%	21.82%

Correlation

The correlation between STPZ and FXAIX is 0.05, meaning there was essentially no consistent relationship between their historical price movements. Each responded to its own set of market drivers.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.05
Correlation (3Y) Balances recent behavior with more history.	0.08
Correlation (5Y) Shows whether the relationship held over a longer period.	0.13
Correlation (10Y) Provides a long-term view across more market conditions.	0.09
Correlation (All Time) Calculated using the full available price history since May 4, 2011	0.05

Return for Risk

STPZ vs. FXAIX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

STPZ

STPZ Risk / Return Rank: 61
STPZ Sharpe Ratio Rank: 56
STPZ Sortino Ratio Rank: 56
STPZ Omega Ratio Rank: 57
STPZ Calmar Ratio Rank: 76
STPZ Martin Ratio Rank: 60

FXAIX

FXAIX Risk / Return Rank: 59
FXAIX Sharpe Ratio Rank: 56
FXAIX Sortino Ratio Rank: 52
FXAIX Omega Ratio Rank: 53
FXAIX Calmar Ratio Rank: 61
FXAIX Martin Ratio Rank: 74

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

STPZ vs. FXAIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for PIMCO 1-5 Year US TIPS Index ETF (STPZ) and Fidelity 500 Index Fund (FXAIX). 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.

	STPZ	FXAIX	Difference
Sharpe ratio: Return per unit of total volatility	1.40	1.53	-0.13
Sortino ratio: Return per unit of downside risk	2.01	2.12	-0.11
Omega ratio: Gain probability vs. loss probability	1.26	1.27	-0.01
Calmar ratio: Return relative to maximum drawdown	2.80	2.21	+0.60
Martin ratio: Return relative to average drawdown	7.50	9.48	-1.98

STPZ vs. FXAIX - Sharpe Ratio Comparison

The current STPZ Sharpe Ratio is 1.40, which is comparable to the FXAIX Sharpe Ratio of 1.53. The chart below compares the historical Sharpe Ratios of STPZ and FXAIX, 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

STPZ vs. FXAIX - Drawdown Comparison

The maximum STPZ drawdown since its inception was -6.77%, smaller than the maximum FXAIX drawdown of -33.79%. Use the drawdown chart below to compare losses from any high point for STPZ and FXAIX.

Drawdown Indicators

	STPZ	FXAIX	Difference
Max Drawdown Largest peak-to-trough decline	-6.77%	-33.79%	+27.02%
Max Drawdown (1Y) Largest decline over 1 year	-0.93%	-8.89%	+7.96%
Max Drawdown (3Y) Largest decline over 3 years	-1.35%	-18.76%	+17.41%
Max Drawdown (5Y) Largest decline over 5 years	-6.70%	-24.50%	+17.80%
Max Drawdown (10Y) Largest decline over 10 years	-6.77%	-33.79%	+27.02%
Current Drawdown Current decline from peak	-0.43%	-1.41%	+0.98%
Average Drawdown Average peak-to-trough decline	-1.30%	-3.77%	+2.47%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.35%	2.07%	-1.72%

Volatility

STPZ vs. FXAIX - Volatility Comparison

The current volatility for PIMCO 1-5 Year US TIPS Index ETF (STPZ) is 0.46%, while Fidelity 500 Index Fund (FXAIX) has a volatility of 3.52%. This indicates that STPZ experiences smaller price fluctuations and is considered to be less risky than FXAIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	STPZ	FXAIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.46%	3.52%	-3.06%
Volatility (6M) Calculated over the trailing 6-month period	1.44%	10.11%	-8.67%
Volatility (1Y) Calculated over the trailing 1-year period	1.87%	12.87%	-11.00%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.28%	17.02%	-13.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.98%	18.07%	-15.09%

STPZ vs. FXAIX - Expense Ratio Comparison

STPZ has a 0.20% expense ratio, which is higher than FXAIX's 0.02% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

STPZ vs. FXAIX - Dividend Comparison

STPZ's dividend yield for the trailing twelve months is around 5.27%, more than FXAIX's 1.06% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FXAIX Fidelity 500 Index Fund	1.06%	1.11%	1.25%	1.45%	1.69%	1.22%	1.60%	2.06%	2.72%	1.97%	2.52%	2.83%
STPZ PIMCO 1-5 Year US TIPS Index ETF	5.27%	3.65%	1.97%	1.63%	5.88%	3.65%	1.86%	1.76%	2.23%	1.51%	0.65%	0.49%

Frequently Asked Questions

Can I hold both STPZ and FXAIX in my portfolio?

STPZ and FXAIX have a correlation of 0.05, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, STPZ or FXAIX?

FXAIX has higher volatility (3.52%) compared to STPZ (0.46%). In terms of maximum drawdown, STPZ dropped -6.77% vs FXAIX's -33.79%.

Which has better risk-adjusted returns?

FXAIX currently has the higher Sharpe Ratio (1.53 vs 1.40), 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.