FTLTX vs. PRGMX

Last updated Apr 2, 2026

Compare and contrast key facts about Fidelity Series Long-Term Treasury Bond Index Fund (FTLTX) and T. Rowe Price GNMA Fund (PRGMX).

FTLTX is managed by Fidelity. It was launched on Jul 7, 2016. PRGMX is managed by T. Rowe Price. It was launched on Nov 25, 1985.

Performance

FTLTX vs. PRGMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Series Long-Term Treasury Bond Index Fund (FTLTX) and T. Rowe Price GNMA Fund (PRGMX). The values are adjusted to include any dividend payments, if applicable.

FTLTX vs. PRGMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FTLTX Fidelity Series Long-Term Treasury Bond Index Fund	-0.50%	5.45%	-6.13%	3.27%	-29.89%	-5.13%	17.45%	14.23%	-1.63%	8.22%
PRGMX T. Rowe Price GNMA Fund	0.87%	10.46%	0.92%	5.62%	-11.45%	-2.18%	4.21%	5.18%	0.58%	1.23%

Returns By Period

In the year-to-date period, FTLTX achieves a -0.50% return, which is significantly lower than PRGMX's 0.87% return.

FTLTX

• 1D: -0.19%
• 1M: -3.44%
• YTD: -0.50%
• 6M: -1.02%
• 1Y: -0.72%
• 3Y*: -1.60%
• 5Y*: -5.02%
• 10Y*: —

PRGMX

• 1D: 0.24%
• 1M: -1.44%
• YTD: 0.87%
• 6M: 2.89%
• 1Y: 7.97%
• 3Y*: 4.79%
• 5Y*: 0.72%
• 10Y*: 1.40%

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

FTLTX vs. PRGMX - Expense Ratio Comparison

FTLTX has a 0.00% expense ratio, which is lower than PRGMX's 0.58% expense ratio.

PRGMX

T. Rowe Price GNMA Fund

FTLTX

Fidelity Series Long-Term Treasury Bond Index Fund

Return for Risk

FTLTX vs. PRGMX — Risk / Return Rank

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

FTLTX

FTLTX Risk / Return Rank: 5
FTLTX Sharpe Ratio Rank: 4
FTLTX Sortino Ratio Rank: 4
FTLTX Omega Ratio Rank: 4
FTLTX Calmar Ratio Rank: 7
FTLTX Martin Ratio Rank: 7

PRGMX

PRGMX Risk / Return Rank: 85
PRGMX Sharpe Ratio Rank: 86
PRGMX Sortino Ratio Rank: 88
PRGMX Omega Ratio Rank: 79
PRGMX Calmar Ratio Rank: 92
PRGMX Martin Ratio Rank: 80

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.

FTLTX vs. PRGMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Series Long-Term Treasury Bond Index Fund (FTLTX) and T. Rowe Price GNMA Fund (PRGMX). 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.

	FTLTX	PRGMX	Difference
Sharpe ratio Return per unit of total volatility	0.00	1.77	-1.77
Sortino ratio Return per unit of downside risk	0.07	2.53	-2.46
Omega ratio Gain probability vs. loss probability	1.01	1.33	-0.32
Calmar ratio Return relative to maximum drawdown	0.14	3.01	-2.87
Martin ratio Return relative to average drawdown	0.32	8.77	-8.46
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FTLTX vs. PRGMX - Sharpe Ratio Comparison

The current FTLTX Sharpe Ratio is 0.00, which is lower than the PRGMX Sharpe Ratio of 1.77. The chart below compares the historical Sharpe Ratios of FTLTX and PRGMX, 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

	FTLTX	PRGMX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.00	1.77	-1.77
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.34	0.11	-0.46
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.30	—
Sharpe Ratio (All Time) Calculated using the full available price history	-0.03	0.94	-0.97

Correlation

The correlation between FTLTX and PRGMX is 0.71, 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

FTLTX vs. PRGMX - Dividend Comparison

FTLTX's dividend yield for the trailing twelve months is around 3.56%, less than PRGMX's 6.90% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FTLTX Fidelity Series Long-Term Treasury Bond Index Fund	3.56%	3.83%	3.71%	3.17%	2.20%	2.06%	12.95%	10.68%	2.89%	2.44%	0.00%	0.00%
PRGMX T. Rowe Price GNMA Fund	6.90%	6.52%	3.54%	3.54%	1.38%	0.59%	1.44%	2.39%	2.78%	2.98%	2.88%	3.12%

Drawdowns

FTLTX vs. PRGMX - Drawdown Comparison

The maximum FTLTX drawdown since its inception was -46.86%, which is greater than PRGMX's maximum drawdown of -18.22%. Use the drawdown chart below to compare losses from any high point for FTLTX and PRGMX.

Drawdown Indicators

	FTLTX	PRGMX	Difference
Max Drawdown Largest peak-to-trough decline	-46.86%	-18.22%	-28.64%
Max Drawdown (1Y) Largest decline over 1 year	-8.76%	-2.93%	-5.83%
Max Drawdown (5Y) Largest decline over 5 years	-41.52%	-17.70%	-23.82%
Max Drawdown (10Y) Largest decline over 10 years	—	-18.22%	—
Current Drawdown Current decline from peak	-37.37%	-1.91%	-35.46%
Average Drawdown Average peak-to-trough decline	-19.66%	-2.25%	-17.41%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.94%	1.00%	+2.94%

Volatility

FTLTX vs. PRGMX - Volatility Comparison

Fidelity Series Long-Term Treasury Bond Index Fund (FTLTX) has a higher volatility of 3.62% compared to T. Rowe Price GNMA Fund (PRGMX) at 1.74%. This indicates that FTLTX's price experiences larger fluctuations and is considered to be riskier than PRGMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FTLTX	PRGMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.62%	1.74%	+1.88%
Volatility (6M) Calculated over the trailing 6-month period	6.12%	2.76%	+3.36%
Volatility (1Y) Calculated over the trailing 1-year period	10.59%	4.77%	+5.82%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.63%	6.33%	+8.30%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	13.96%	4.73%	+9.23%