FSPWX vs. FSKAX

Last updated Apr 1, 2026

Compare and contrast key facts about Fidelity SAI Inflation-Protected Bond Index Fund (FSPWX) and Fidelity Total Market Index Fund (FSKAX).

FSPWX is a passively managed fund by Fidelity that tracks the performance of the Bloomberg U.S. Treasury Inflation Protected Securities Index. It was launched on Aug 16, 2024. FSKAX is managed by Fidelity.

Performance

FSPWX vs. FSKAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity SAI Inflation-Protected Bond Index Fund (FSPWX) and Fidelity Total Market Index Fund (FSKAX). The values are adjusted to include any dividend payments, if applicable.

FSPWX vs. FSKAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024
FSPWX Fidelity SAI Inflation-Protected Bond Index Fund	0.50%	6.76%	-1.32%
FSKAX Fidelity Total Market Index Fund	-6.77%	17.06%	6.48%

Returns By Period

In the year-to-date period, FSPWX achieves a 0.50% return, which is significantly higher than FSKAX's -6.77% return.

FSPWX

• 1D: 0.70%
• 1M: -1.27%
• YTD: 0.50%
• 6M: 0.41%
• 1Y: 2.99%
• 3Y*: —
• 5Y*: —
• 10Y*: —

FSKAX

• 1D: -0.47%
• 1M: -7.69%
• YTD: -6.77%
• 6M: -4.56%
• 1Y: 14.73%
• 3Y*: 16.72%
• 5Y*: 10.13%
• 10Y*: 13.23%

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

FSPWX vs. FSKAX - Expense Ratio Comparison

FSPWX has a 0.05% expense ratio, which is higher than FSKAX'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%.

FSPWX

Fidelity SAI Inflation-Protected Bond Index Fund

FSKAX

Fidelity Total Market Index Fund

Return for Risk

FSPWX vs. FSKAX — Risk / Return Rank

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

FSPWX

FSPWX Risk / Return Rank: 40
FSPWX Sharpe Ratio Rank: 38
FSPWX Sortino Ratio Rank: 34
FSPWX Omega Ratio Rank: 28
FSPWX Calmar Ratio Rank: 60
FSPWX Martin Ratio Rank: 42

FSKAX

FSKAX Risk / Return Rank: 45
FSKAX Sharpe Ratio Rank: 40
FSKAX Sortino Ratio Rank: 44
FSKAX Omega Ratio Rank: 48
FSKAX Calmar Ratio Rank: 41
FSKAX Martin Ratio Rank: 52

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.

FSPWX vs. FSKAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity SAI Inflation-Protected Bond Index Fund (FSPWX) and Fidelity Total Market Index Fund (FSKAX). 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.

	FSPWX	FSKAX	Difference
Sharpe ratio Return per unit of total volatility	0.84	0.83	+0.01
Sortino ratio Return per unit of downside risk	1.17	1.29	-0.11
Omega ratio Gain probability vs. loss probability	1.15	1.19	-0.04
Calmar ratio Return relative to maximum drawdown	1.41	1.04	+0.37
Martin ratio Return relative to average drawdown	4.38	5.05	-0.67
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FSPWX vs. FSKAX - Sharpe Ratio Comparison

The current FSPWX Sharpe Ratio is 0.84, which is comparable to the FSKAX Sharpe Ratio of 0.83. The chart below compares the historical Sharpe Ratios of FSPWX and FSKAX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	FSPWX	FSKAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.84	0.83	+0.01
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.59	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.72	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.88	0.78	+0.10

Correlation

The correlation between FSPWX and FSKAX is 0.14, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

FSPWX vs. FSKAX - Dividend Comparison

FSPWX's dividend yield for the trailing twelve months is around 4.17%, more than FSKAX's 1.09% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSPWX Fidelity SAI Inflation-Protected Bond Index Fund	4.17%	4.19%	0.69%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
FSKAX Fidelity Total Market Index Fund	1.09%	1.01%	1.19%	1.41%	1.62%	1.15%	1.45%	1.94%	2.54%	2.07%	2.43%	0.82%

Drawdowns

FSPWX vs. FSKAX - Drawdown Comparison

The maximum FSPWX drawdown since its inception was -3.84%, smaller than the maximum FSKAX drawdown of -35.01%. Use the drawdown chart below to compare losses from any high point for FSPWX and FSKAX.

Drawdown Indicators

	FSPWX	FSKAX	Difference
Max Drawdown Largest peak-to-trough decline	-3.84%	-35.01%	+31.17%
Max Drawdown (1Y) Largest decline over 1 year	-2.91%	-12.42%	+9.51%
Max Drawdown (5Y) Largest decline over 5 years	—	-25.39%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-35.01%	—
Current Drawdown Current decline from peak	-1.27%	-8.92%	+7.65%
Average Drawdown Average peak-to-trough decline	-1.04%	-4.05%	+3.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.94%	2.57%	-1.63%

Volatility

FSPWX vs. FSKAX - Volatility Comparison

The current volatility for Fidelity SAI Inflation-Protected Bond Index Fund (FSPWX) is 1.44%, while Fidelity Total Market Index Fund (FSKAX) has a volatility of 4.42%. This indicates that FSPWX experiences smaller price fluctuations and is considered to be less risky than FSKAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FSPWX	FSKAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.44%	4.42%	-2.98%
Volatility (6M) Calculated over the trailing 6-month period	2.29%	9.40%	-7.11%
Volatility (1Y) Calculated over the trailing 1-year period	4.10%	18.50%	-14.40%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.17%	17.38%	-13.21%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.17%	18.42%	-14.25%