PTTRX vs. SSFDX

Last updated Jun 4, 2026

PTTRX (PIMCO Total Return Fund Institutional Class) and SSFDX (State Street Aggregate Bond Index Fund) are both mutual funds - PTTRX is a Total Bond Market fund managed by PIMCO, while SSFDX is a Intermediate Core Bond fund managed by State Street. Over the past 10 years, PTTRX returned 2.31%/yr vs -19.40%/yr for SSFDX. Their correlation of 0.88 suggests significant overlap in exposure. PTTRX charges 0.47%/yr vs 0.23%/yr for SSFDX.

Performance

PTTRX vs. SSFDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in PIMCO Total Return Fund Institutional Class (PTTRX) and State Street Aggregate Bond Index Fund (SSFDX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PTTRX achieves a 0.64% return, which is significantly higher than SSFDX's 0.42% return. Over the past 10 years, PTTRX has outperformed SSFDX with an annualized return of 2.31%, while SSFDX has yielded a comparatively lower -19.40% annualized return.

PTTRX

• 1D: 0.11%
• 1M: 0.88%
• YTD: 0.64%
• 6M: 0.81%
• 1Y: 7.46%
• 3Y*: 5.45%
• 5Y*: 0.76%
• 10Y*: 2.31%

SSFDX

• 1D: 0.05%
• 1M: 0.49%
• YTD: 0.42%
• 6M: 0.33%
• 1Y: 5.38%
• 3Y*: 3.86%
• 5Y*: 0.01%
• 10Y*: -19.40%

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

PTTRX vs. SSFDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PTTRX PIMCO Total Return Fund Institutional Class	0.64%	9.35%	2.62%	6.33%	-14.72%	-0.59%	8.88%	8.36%	-0.24%	5.13%
SSFDX State Street Aggregate Bond Index Fund	0.42%	6.80%	1.36%	5.39%	-13.36%	-1.98%	-89.24%	8.98%	-0.20%	3.29%

Correlation

The correlation between PTTRX and SSFDX is 0.91, 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	0.91
Correlation (3Y) Calculated over the trailing 3-year period	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.91
Correlation (All Time) Calculated using the full available price history since Sep 23, 2014	0.88

The correlation between PTTRX and SSFDX has been stable across timeframes, ranging from 0.88 to 0.94 - a consistent structural relationship.

Return for Risk

PTTRX vs. SSFDX — Risk / Return Rank

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

PTTRX

PTTRX Risk / Return Rank: 30
PTTRX Sharpe Ratio Rank: 31
PTTRX Sortino Ratio Rank: 32
PTTRX Omega Ratio Rank: 32
PTTRX Calmar Ratio Rank: 29
PTTRX Martin Ratio Rank: 25

SSFDX

SSFDX Risk / Return Rank: 26
SSFDX Sharpe Ratio Rank: 26
SSFDX Sortino Ratio Rank: 27
SSFDX Omega Ratio Rank: 24
SSFDX Calmar Ratio Rank: 27
SSFDX Martin Ratio Rank: 24

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.

PTTRX vs. SSFDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for PIMCO Total Return Fund Institutional Class (PTTRX) and State Street Aggregate Bond Index Fund (SSFDX). 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.

	PTTRX	SSFDX	Difference
Sharpe ratio: Return per unit of total volatility	1.59	1.44	+0.15
Sortino ratio: Return per unit of downside risk	2.34	2.16	+0.17
Omega ratio: Gain probability vs. loss probability	1.29	1.26	+0.04
Calmar ratio: Return relative to maximum drawdown	2.00	1.95	+0.05
Martin ratio: Return relative to average drawdown	6.20	5.97	+0.23
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PTTRX vs. SSFDX - Sharpe Ratio Comparison

The current PTTRX Sharpe Ratio is 1.59, which is comparable to the SSFDX Sharpe Ratio of 1.44. The chart below compares the historical Sharpe Ratios of PTTRX and SSFDX, 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

	PTTRX	SSFDX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.59	1.44	+0.15
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.12	0.00	+0.12
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.44	-0.61	+1.05
Sharpe Ratio (All Time) Calculated using the full available price history	1.15	-0.56	+1.71

Drawdowns

PTTRX vs. SSFDX - Drawdown Comparison

The maximum PTTRX drawdown since its inception was -19.28%, smaller than the maximum SSFDX drawdown of -92.69%. Use the drawdown chart below to compare losses from any high point for PTTRX and SSFDX.

Drawdown Indicators

	PTTRX	SSFDX	Difference
Max Drawdown Largest peak-to-trough decline	-19.28%	-92.69%	+73.41%
Max Drawdown (1Y) Largest decline over 1 year	-3.69%	-2.75%	-0.94%
Max Drawdown (3Y) Largest decline over 3 years	-6.18%	-6.13%	-0.05%
Max Drawdown (5Y) Largest decline over 5 years	-19.28%	-18.19%	-1.09%
Max Drawdown (10Y) Largest decline over 10 years	-19.28%	-92.69%	+73.41%
Current Drawdown Current decline from peak	-1.49%	-90.13%	+88.64%
Average Drawdown Average peak-to-trough decline	-2.19%	-48.03%	+45.84%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.19%	0.90%	+0.29%

Volatility

PTTRX vs. SSFDX - Volatility Comparison

PIMCO Total Return Fund Institutional Class (PTTRX) has a higher volatility of 1.81% compared to State Street Aggregate Bond Index Fund (SSFDX) at 1.29%. This indicates that PTTRX's price experiences larger fluctuations and is considered to be riskier than SSFDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PTTRX	SSFDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.81%	1.29%	+0.52%
Volatility (6M) Calculated over the trailing 6-month period	3.54%	2.66%	+0.88%
Volatility (1Y) Calculated over the trailing 1-year period	4.66%	3.74%	+0.92%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.27%	5.93%	+0.34%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.23%	31.82%	-26.59%

PTTRX vs. SSFDX - Expense Ratio Comparison

PTTRX has a 0.47% expense ratio, which is higher than SSFDX's 0.23% expense ratio.

Dividends

PTTRX vs. SSFDX - Dividend Comparison

PTTRX's dividend yield for the trailing twelve months is around 4.54%, more than SSFDX's 4.11% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PTTRX PIMCO Total Return Fund Institutional Class	4.54%	4.47%	4.61%	3.81%	3.63%	2.59%	6.11%	3.96%	3.13%	2.63%	3.02%	6.64%
SSFDX State Street Aggregate Bond Index Fund	4.11%	3.64%	3.59%	2.95%	2.27%	3.12%	8.84%	3.15%	2.79%	2.43%	2.19%	4.63%

Frequently Asked Questions

Can I hold both PTTRX and SSFDX in my portfolio?

With a correlation of 0.91, PTTRX and SSFDX 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, PTTRX or SSFDX?

PTTRX has higher volatility (1.81%) compared to SSFDX (1.29%). In terms of maximum drawdown, PTTRX dropped -19.28% vs SSFDX's -92.69%.

Which has better risk-adjusted returns?

PTTRX currently has the higher Sharpe Ratio (1.59 vs 1.44), 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.