MPSAX vs. FIPDX

Last updated Jun 5, 2026

MPSAX (MassMutual Inflation-Protected and Income Fund) and FIPDX (Fidelity Inflation-Protected Bond Index Fund) are both Inflation-Protected Bonds funds. Over the past 10 years, MPSAX returned 3.44%/yr vs 2.66%/yr for FIPDX. Their correlation of 0.91 suggests significant overlap in exposure. MPSAX charges 1.02%/yr vs 0.05%/yr for FIPDX.

Performance

MPSAX vs. FIPDX - Performance Comparison

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

Returns By Period

The year-to-date returns for both investments are quite close, with MPSAX having a 1.48% return and FIPDX slightly higher at 1.55%. Over the past 10 years, MPSAX has outperformed FIPDX with an annualized return of 3.44%, while FIPDX has yielded a comparatively lower 2.66% annualized return.

MPSAX

• 1D: -0.22%
• 1M: -0.01%
• YTD: 1.48%
• 6M: 1.22%
• 1Y: 3.45%
• 3Y*: 3.19%
• 5Y*: 2.80%
• 10Y*: 3.44%

FIPDX

• 1D: -0.11%
• 1M: 0.11%
• YTD: 1.55%
• 6M: 1.22%
• 1Y: 4.77%
• 3Y*: 4.04%
• 5Y*: 1.11%
• 10Y*: 2.66%

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

MPSAX vs. FIPDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MPSAX MassMutual Inflation-Protected and Income Fund	1.48%	5.50%	-0.02%	4.93%	-13.72%	20.31%	10.79%	7.67%	-1.86%	2.86%
FIPDX Fidelity Inflation-Protected Bond Index Fund	1.55%	6.90%	2.00%	3.77%	-12.09%	5.94%	10.90%	8.32%	-1.37%	2.98%

Correlation

The correlation between MPSAX and FIPDX is 0.87, 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	0.87
Correlation (3Y) Calculated over the trailing 3-year period	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.90
Correlation (All Time) Calculated using the full available price history since May 11, 2012	0.91

The correlation between MPSAX and FIPDX has been stable across timeframes, ranging from 0.87 to 0.94 - a consistent structural relationship.

Return for Risk

MPSAX vs. FIPDX — Risk / Return Rank

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

MPSAX

MPSAX Risk / Return Rank: 20
MPSAX Sharpe Ratio Rank: 17
MPSAX Sortino Ratio Rank: 18
MPSAX Omega Ratio Rank: 17
MPSAX Calmar Ratio Rank: 29
MPSAX Martin Ratio Rank: 18

FIPDX

FIPDX Risk / Return Rank: 34
FIPDX Sharpe Ratio Rank: 28
FIPDX Sortino Ratio Rank: 30
FIPDX Omega Ratio Rank: 28
FIPDX Calmar Ratio Rank: 48
FIPDX Martin Ratio Rank: 35

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.

MPSAX vs. FIPDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MassMutual Inflation-Protected and Income Fund (MPSAX) and Fidelity Inflation-Protected Bond Index Fund (FIPDX). 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.

	MPSAX	FIPDX	Difference
Sharpe ratio: Return per unit of total volatility	1.13	1.53	-0.40
Sortino ratio: Return per unit of downside risk	1.71	2.30	-0.59
Omega ratio: Gain probability vs. loss probability	1.20	1.28	-0.08
Calmar ratio: Return relative to maximum drawdown	1.92	2.65	-0.73
Martin ratio: Return relative to average drawdown	4.59	7.78	-3.18
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MPSAX vs. FIPDX - Sharpe Ratio Comparison

The current MPSAX Sharpe Ratio is 1.13, which is comparable to the FIPDX Sharpe Ratio of 1.53. The chart below compares the historical Sharpe Ratios of MPSAX and FIPDX, 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

	MPSAX	FIPDX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.13	1.53	-0.40
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.24	0.19	+0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.38	0.50	-0.11
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	0.41	+0.03

Drawdowns

MPSAX vs. FIPDX - Drawdown Comparison

The maximum MPSAX drawdown since its inception was -19.35%, which is greater than FIPDX's maximum drawdown of -14.32%. Use the drawdown chart below to compare losses from any high point for MPSAX and FIPDX.

Drawdown Indicators

	MPSAX	FIPDX	Difference
Max Drawdown Largest peak-to-trough decline	-19.35%	-14.32%	-5.03%
Max Drawdown (1Y) Largest decline over 1 year	-2.04%	-1.94%	-0.10%
Max Drawdown (3Y) Largest decline over 3 years	-4.01%	-4.49%	+0.48%
Max Drawdown (5Y) Largest decline over 5 years	-19.35%	-14.32%	-5.03%
Max Drawdown (10Y) Largest decline over 10 years	-19.35%	-14.32%	-5.03%
Current Drawdown Current decline from peak	-8.05%	-0.22%	-7.83%
Average Drawdown Average peak-to-trough decline	-6.19%	-4.47%	-1.72%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.85%	0.66%	+0.19%

Volatility

MPSAX vs. FIPDX - Volatility Comparison

MassMutual Inflation-Protected and Income Fund (MPSAX) has a higher volatility of 1.11% compared to Fidelity Inflation-Protected Bond Index Fund (FIPDX) at 0.90%. This indicates that MPSAX's price experiences larger fluctuations and is considered to be riskier than FIPDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MPSAX	FIPDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.11%	0.90%	+0.21%
Volatility (6M) Calculated over the trailing 6-month period	2.36%	2.28%	+0.08%
Volatility (1Y) Calculated over the trailing 1-year period	3.46%	3.36%	+0.10%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	11.77%	5.97%	+5.80%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	8.97%	5.37%	+3.60%

MPSAX vs. FIPDX - Expense Ratio Comparison

MPSAX has a 1.02% expense ratio, which is higher than FIPDX's 0.05% expense ratio.

Dividends

MPSAX vs. FIPDX - Dividend Comparison

MPSAX's dividend yield for the trailing twelve months is around 3.40%, less than FIPDX's 3.79% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FIPDX Fidelity Inflation-Protected Bond Index Fund	3.79%	4.18%	3.75%	3.56%	8.87%	4.76%	1.24%	1.97%	2.26%	1.29%	1.34%	0.38%
MPSAX MassMutual Inflation-Protected and Income Fund	3.40%	3.51%	1.44%	2.47%	3.34%	18.54%	5.13%	1.59%	2.68%	2.34%	2.23%	0.61%

Frequently Asked Questions

Can I hold both MPSAX and FIPDX in my portfolio?

MPSAX and FIPDX have a correlation of 0.87, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MPSAX or FIPDX?

MPSAX has higher volatility (1.11%) compared to FIPDX (0.90%). In terms of maximum drawdown, MPSAX dropped -19.35% vs FIPDX's -14.32%.

Which has better risk-adjusted returns?

FIPDX currently has the higher Sharpe Ratio (1.53 vs 1.13), 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.