FTLTX vs. FNBGX

Last updated Jun 4, 2026

FTLTX (Fidelity Series Long-Term Treasury Bond Index Fund) and FNBGX (Fidelity Long-Term Treasury Bond Index Fund) are both Government Bonds funds from Fidelity. Over the past 5 years, FTLTX returned -5.06%/yr vs -5.10%/yr for FNBGX. With a 0.99 correlation, they move nearly in lockstep. FTLTX charges 0.00%/yr vs 0.03%/yr for FNBGX.

Performance

FTLTX vs. FNBGX - 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 Fidelity Long-Term Treasury Bond Index Fund (FNBGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FTLTX achieves a -0.06% return, which is significantly lower than FNBGX's 0.02% return.

FTLTX

• 1D: 0.19%
• 1M: 1.11%
• YTD: -0.06%
• 6M: -1.19%
• 1Y: 5.75%
• 3Y*: -0.49%
• 5Y*: -5.06%
• 10Y*: —

FNBGX

• 1D: 0.22%
• 1M: 1.23%
• YTD: 0.02%
• 6M: -1.23%
• 1Y: 5.75%
• 3Y*: -0.54%
• 5Y*: -5.10%
• 10Y*: —

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

FTLTX vs. FNBGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FTLTX Fidelity Series Long-Term Treasury Bond Index Fund	-0.06%	5.45%	-6.13%	3.27%	-29.89%	-5.13%	17.45%	14.23%	-1.63%	1.82%
FNBGX Fidelity Long-Term Treasury Bond Index Fund	0.02%	5.30%	-6.18%	3.20%	-29.89%	-5.17%	17.58%	14.24%	-1.62%	1.86%

Correlation

The correlation between FTLTX and FNBGX is 0.98 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.98
Correlation (3Y) Calculated over the trailing 3-year period	0.99
Correlation (5Y) Calculated over the trailing 5-year period	0.99
Correlation (All Time) Calculated using the full available price history since Oct 20, 2017	0.99

The correlation between FTLTX and FNBGX has been stable across timeframes, ranging from 0.98 to 0.99 - a consistent structural relationship.

Return for Risk

FTLTX vs. FNBGX — Risk / Return Rank

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

FTLTX

FTLTX Risk / Return Rank: 7
FTLTX Sharpe Ratio Rank: 7
FTLTX Sortino Ratio Rank: 7
FTLTX Omega Ratio Rank: 7
FTLTX Calmar Ratio Rank: 8
FTLTX Martin Ratio Rank: 7

FNBGX

FNBGX Risk / Return Rank: 7
FNBGX Sharpe Ratio Rank: 8
FNBGX Sortino Ratio Rank: 7
FNBGX Omega Ratio Rank: 7
FNBGX Calmar Ratio Rank: 8
FNBGX Martin Ratio Rank: 7

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. FNBGX - 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 Fidelity Long-Term Treasury Bond Index Fund (FNBGX). 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	FNBGX	Difference
Sharpe ratio: Return per unit of total volatility	0.62	0.63	-0.01
Sortino ratio: Return per unit of downside risk	0.95	0.96	-0.01
Omega ratio: Gain probability vs. loss probability	1.11	1.11	0.00
Calmar ratio: Return relative to maximum drawdown	0.78	0.78	+0.01
Martin ratio: Return relative to average drawdown	2.04	2.06	-0.02
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. FNBGX - Sharpe Ratio Comparison

The current FTLTX Sharpe Ratio is 0.62, which is comparable to the FNBGX Sharpe Ratio of 0.63. The chart below compares the historical Sharpe Ratios of FTLTX and FNBGX, 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

	FTLTX	FNBGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.62	0.63	-0.01
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.35	-0.35	0.00
Sharpe Ratio (All Time) Calculated using the full available price history	-0.02	-0.07	+0.05

Drawdowns

FTLTX vs. FNBGX - Drawdown Comparison

The maximum FTLTX drawdown since its inception was -46.86%, roughly equal to the maximum FNBGX drawdown of -46.86%. Use the drawdown chart below to compare losses from any high point for FTLTX and FNBGX.

Drawdown Indicators

	FTLTX	FNBGX	Difference
Max Drawdown Largest peak-to-trough decline	-46.86%	-46.86%	0.00%
Max Drawdown (1Y) Largest decline over 1 year	-7.10%	-7.28%	+0.18%
Max Drawdown (3Y) Largest decline over 3 years	-17.72%	-17.66%	-0.06%
Max Drawdown (5Y) Largest decline over 5 years	-41.52%	-41.54%	+0.02%
Current Drawdown Current decline from peak	-37.09%	-37.24%	+0.15%
Average Drawdown Average peak-to-trough decline	-19.99%	-21.65%	+1.66%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.73%	2.74%	-0.01%

Volatility

FTLTX vs. FNBGX - Volatility Comparison

The current volatility for Fidelity Series Long-Term Treasury Bond Index Fund (FTLTX) is 2.57%, while Fidelity Long-Term Treasury Bond Index Fund (FNBGX) has a volatility of 2.79%. This indicates that FTLTX experiences smaller price fluctuations and is considered to be less risky than FNBGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FTLTX	FNBGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.57%	2.79%	-0.22%
Volatility (6M) Calculated over the trailing 6-month period	6.08%	6.13%	-0.05%
Volatility (1Y) Calculated over the trailing 1-year period	9.01%	9.03%	-0.02%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.59%	14.59%	0.00%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	13.87%	14.20%	-0.33%

FTLTX vs. FNBGX - Expense Ratio Comparison

FTLTX has a 0.00% expense ratio, which is lower than FNBGX's 0.03% 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%.

Dividends

FTLTX vs. FNBGX - Dividend Comparison

FTLTX's dividend yield for the trailing twelve months is around 3.94%, less than FNBGX's 4.00% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
FNBGX Fidelity Long-Term Treasury Bond Index Fund	4.00%	3.88%	3.75%	3.20%	2.26%	2.47%	3.96%	2.63%	2.93%	0.70%
FTLTX Fidelity Series Long-Term Treasury Bond Index Fund	3.94%	3.83%	3.71%	3.17%	2.20%	2.06%	12.95%	10.68%	2.89%	2.44%

Frequently Asked Questions

Can I hold both FTLTX and FNBGX in my portfolio?

With a correlation of 0.98, FTLTX and FNBGX 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, FTLTX or FNBGX?

FNBGX has higher volatility (2.79%) compared to FTLTX (2.57%). In terms of maximum drawdown, FTLTX dropped -46.86% vs FNBGX's -46.86%.

Which has better risk-adjusted returns?

FNBGX currently has the higher Sharpe Ratio (0.63 vs 0.62), 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.