FNBGX vs. TIBDX

Last updated Apr 1, 2026

Compare and contrast key facts about Fidelity Long-Term Treasury Bond Index Fund (FNBGX) and TIAA-CREF Core Bond Fund (TIBDX).

FNBGX is managed by Fidelity. It was launched on Dec 20, 2005. TIBDX is managed by TIAA Investments. It was launched on Jul 1, 1999.

Performance

FNBGX vs. TIBDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Long-Term Treasury Bond Index Fund (FNBGX) and TIAA-CREF Core Bond Fund (TIBDX). The values are adjusted to include any dividend payments, if applicable.

FNBGX vs. TIBDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FNBGX Fidelity Long-Term Treasury Bond Index Fund	-0.35%	5.30%	-6.18%	3.20%	-29.89%	-5.17%	17.58%	14.24%	-1.62%	1.86%
TIBDX TIAA-CREF Core Bond Fund	-0.69%	7.38%	1.95%	5.63%	-13.68%	-0.95%	8.10%	9.57%	-0.64%	0.40%

Returns By Period

In the year-to-date period, FNBGX achieves a -0.35% return, which is significantly higher than TIBDX's -0.69% return.

FNBGX

• 1D: 1.21%
• 1M: -4.27%
• YTD: -0.35%
• 6M: -0.77%
• 1Y: 0.13%
• 3Y*: -1.65%
• 5Y*: -4.78%
• 10Y*: —

TIBDX

• 1D: 0.44%
• 1M: -2.56%
• YTD: -0.69%
• 6M: 0.40%
• 1Y: 3.86%
• 3Y*: 3.62%
• 5Y*: 0.19%
• 10Y*: 1.99%

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

FNBGX vs. TIBDX - Expense Ratio Comparison

FNBGX has a 0.03% expense ratio, which is lower than TIBDX's 0.29% expense ratio.

TIBDX

TIAA-CREF Core Bond Fund

FNBGX

Fidelity Long-Term Treasury Bond Index Fund

Return for Risk

FNBGX vs. TIBDX — Risk / Return Rank

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

FNBGX

FNBGX Risk / Return Rank: 9
FNBGX Sharpe Ratio Rank: 8
FNBGX Sortino Ratio Rank: 7
FNBGX Omega Ratio Rank: 7
FNBGX Calmar Ratio Rank: 12
FNBGX Martin Ratio Rank: 10

TIBDX

TIBDX Risk / Return Rank: 57
TIBDX Sharpe Ratio Rank: 59
TIBDX Sortino Ratio Rank: 58
TIBDX Omega Ratio Rank: 45
TIBDX Calmar Ratio Rank: 71
TIBDX Martin Ratio Rank: 52

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.

FNBGX vs. TIBDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Long-Term Treasury Bond Index Fund (FNBGX) and TIAA-CREF Core Bond Fund (TIBDX). 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.

	FNBGX	TIBDX	Difference
Sharpe ratio Return per unit of total volatility	0.12	1.06	-0.95
Sortino ratio Return per unit of downside risk	0.23	1.51	-1.29
Omega ratio Gain probability vs. loss probability	1.03	1.19	-0.16
Calmar ratio Return relative to maximum drawdown	0.30	1.62	-1.32
Martin ratio Return relative to average drawdown	0.66	5.07	-4.41
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FNBGX vs. TIBDX - Sharpe Ratio Comparison

The current FNBGX Sharpe Ratio is 0.12, which is lower than the TIBDX Sharpe Ratio of 1.06. The chart below compares the historical Sharpe Ratios of FNBGX and TIBDX, 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

	FNBGX	TIBDX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.12	1.06	-0.95
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.33	0.03	-0.36
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.42	—
Sharpe Ratio (All Time) Calculated using the full available price history	-0.08	0.95	-1.03

Correlation

The correlation between FNBGX and TIBDX is 0.87, 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

FNBGX vs. TIBDX - Dividend Comparison

FNBGX's dividend yield for the trailing twelve months is around 3.60%, less than TIBDX's 4.04% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FNBGX Fidelity Long-Term Treasury Bond Index Fund	3.60%	3.88%	3.75%	3.20%	2.26%	2.47%	3.96%	2.63%	2.93%	0.70%	0.00%	0.00%
TIBDX TIAA-CREF Core Bond Fund	4.04%	4.34%	3.60%	3.22%	2.44%	2.39%	4.45%	3.09%	2.88%	2.93%	3.80%	4.68%

Drawdowns

FNBGX vs. TIBDX - Drawdown Comparison

The maximum FNBGX drawdown since its inception was -46.86%, which is greater than TIBDX's maximum drawdown of -18.82%. Use the drawdown chart below to compare losses from any high point for FNBGX and TIBDX.

Drawdown Indicators

	FNBGX	TIBDX	Difference
Max Drawdown Largest peak-to-trough decline	-46.86%	-18.82%	-28.04%
Max Drawdown (1Y) Largest decline over 1 year	-8.75%	-2.98%	-5.77%
Max Drawdown (5Y) Largest decline over 5 years	-41.54%	-18.82%	-22.72%
Max Drawdown (10Y) Largest decline over 10 years	—	-18.82%	—
Current Drawdown Current decline from peak	-37.47%	-2.56%	-34.91%
Average Drawdown Average peak-to-trough decline	-21.32%	-2.31%	-19.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.97%	0.95%	+3.02%

Volatility

FNBGX vs. TIBDX - Volatility Comparison

Fidelity Long-Term Treasury Bond Index Fund (FNBGX) has a higher volatility of 3.58% compared to TIAA-CREF Core Bond Fund (TIBDX) at 1.57%. This indicates that FNBGX's price experiences larger fluctuations and is considered to be riskier than TIBDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FNBGX	TIBDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.58%	1.57%	+2.01%
Volatility (6M) Calculated over the trailing 6-month period	6.05%	2.55%	+3.50%
Volatility (1Y) Calculated over the trailing 1-year period	10.49%	4.26%	+6.23%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.61%	5.59%	+9.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	14.30%	4.71%	+9.59%