FSTDX vs. RRPAX

Last updated Apr 2, 2026

Compare and contrast key facts about Fidelity Series 5+ Year Inflation-Protected Bond Index Fund (FSTDX) and SEI Institutional Investments Trust Real Return Fund (RRPAX).

FSTDX is managed by Fidelity. It was launched on Jan 17, 2022. RRPAX is managed by SEI. It was launched on Dec 13, 2006.

Performance

FSTDX vs. RRPAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Series 5+ Year Inflation-Protected Bond Index Fund (FSTDX) and SEI Institutional Investments Trust Real Return Fund (RRPAX). The values are adjusted to include any dividend payments, if applicable.

FSTDX vs. RRPAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
FSTDX Fidelity Series 5+ Year Inflation-Protected Bond Index Fund	0.00%	7.38%	-0.43%	2.84%	-19.06%	2.10%
RRPAX SEI Institutional Investments Trust Real Return Fund	0.86%	6.53%	4.54%	3.49%	-4.06%	1.27%

Returns By Period

FSTDX

• 1D: 0.13%
• 1M: -2.07%
• YTD: 0.00%
• 6M: -0.40%
• 1Y: 2.12%
• 3Y*: 1.61%
• 5Y*: —
• 10Y*: —

RRPAX

• 1D: 0.00%
• 1M: -0.11%
• YTD: 0.86%
• 6M: 0.95%
• 1Y: 3.81%
• 3Y*: 4.34%
• 5Y*: 3.04%
• 10Y*: 2.90%

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

FSTDX vs. RRPAX - Expense Ratio Comparison

FSTDX has a 0.00% expense ratio, which is lower than RRPAX's 0.02% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

RRPAX

SEI Institutional Investments Trust Real Return Fund

FSTDX

Fidelity Series 5+ Year Inflation-Protected Bond Index Fund

Return for Risk

FSTDX vs. RRPAX — Risk / Return Rank

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

FSTDX

FSTDX Risk / Return Rank: 11
FSTDX Sharpe Ratio Rank: 10
FSTDX Sortino Ratio Rank: 8
FSTDX Omega Ratio Rank: 8
FSTDX Calmar Ratio Rank: 16
FSTDX Martin Ratio Rank: 13

RRPAX

RRPAX Risk / Return Rank: 87
RRPAX Sharpe Ratio Rank: 83
RRPAX Sortino Ratio Rank: 87
RRPAX Omega Ratio Rank: 85
RRPAX Calmar Ratio Rank: 92
RRPAX Martin Ratio Rank: 89

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.

FSTDX vs. RRPAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Series 5+ Year Inflation-Protected Bond Index Fund (FSTDX) and SEI Institutional Investments Trust Real Return Fund (RRPAX). 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.

	FSTDX	RRPAX	Difference
Sharpe ratio Return per unit of total volatility	0.32	1.67	-1.34
Sortino ratio Return per unit of downside risk	0.47	2.50	-2.03
Omega ratio Gain probability vs. loss probability	1.06	1.37	-0.31
Calmar ratio Return relative to maximum drawdown	0.63	2.99	-2.36
Martin ratio Return relative to average drawdown	1.72	10.50	-8.78
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FSTDX vs. RRPAX - Sharpe Ratio Comparison

The current FSTDX Sharpe Ratio is 0.32, which is lower than the RRPAX Sharpe Ratio of 1.67. The chart below compares the historical Sharpe Ratios of FSTDX and RRPAX, 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

	FSTDX	RRPAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.32	1.67	-1.34
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.95	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	1.08	—
Sharpe Ratio (All Time) Calculated using the full available price history	-0.22	0.50	-0.72

Correlation

The correlation between FSTDX and RRPAX is 0.76, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

FSTDX vs. RRPAX - Dividend Comparison

FSTDX's dividend yield for the trailing twelve months is around 4.38%, less than RRPAX's 4.60% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
FSTDX Fidelity Series 5+ Year Inflation-Protected Bond Index Fund	4.38%	4.38%	3.58%	3.28%	6.69%	0.88%	0.00%	0.00%	0.00%	0.00%	0.00%
RRPAX SEI Institutional Investments Trust Real Return Fund	4.60%	4.64%	3.57%	2.43%	7.18%	5.33%	1.38%	2.14%	2.35%	1.89%	1.23%

Drawdowns

FSTDX vs. RRPAX - Drawdown Comparison

The maximum FSTDX drawdown since its inception was -24.29%, which is greater than RRPAX's maximum drawdown of -16.15%. Use the drawdown chart below to compare losses from any high point for FSTDX and RRPAX.

Drawdown Indicators

	FSTDX	RRPAX	Difference
Max Drawdown Largest peak-to-trough decline	-24.29%	-16.15%	-8.14%
Max Drawdown (1Y) Largest decline over 1 year	-4.64%	-1.35%	-3.29%
Max Drawdown (5Y) Largest decline over 5 years	—	-6.48%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-6.48%	—
Current Drawdown Current decline from peak	-11.78%	-0.43%	-11.35%
Average Drawdown Average peak-to-trough decline	-14.16%	-2.97%	-11.19%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.69%	0.38%	+1.31%

Volatility

FSTDX vs. RRPAX - Volatility Comparison

Fidelity Series 5+ Year Inflation-Protected Bond Index Fund (FSTDX) has a higher volatility of 2.18% compared to SEI Institutional Investments Trust Real Return Fund (RRPAX) at 0.70%. This indicates that FSTDX's price experiences larger fluctuations and is considered to be riskier than RRPAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FSTDX	RRPAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.18%	0.70%	+1.48%
Volatility (6M) Calculated over the trailing 6-month period	3.67%	1.20%	+2.47%
Volatility (1Y) Calculated over the trailing 1-year period	6.60%	2.30%	+4.30%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	9.59%	3.23%	+6.36%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	9.59%	2.69%	+6.90%