FIBUX vs. FSPGX

Last updated Jun 4, 2026

FIBUX (Fidelity Flex U.S. Bond Index Fund) and FSPGX (Fidelity Large Cap Growth Index Fund) are both mutual funds - FIBUX is a Total Bond Market fund managed by Fidelity, while FSPGX is a Large Cap Growth Equities fund managed by Fidelity. Over the past 5 years, FIBUX returned 0.09%/yr vs 16.03%/yr for FSPGX. At a 0.02 correlation, their price movements are largely independent. FIBUX charges 0.00%/yr vs 0.04%/yr for FSPGX.

Performance

FIBUX vs. FSPGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Flex U.S. Bond Index Fund (FIBUX) and Fidelity Large Cap Growth Index Fund (FSPGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FIBUX achieves a 0.46% return, which is significantly lower than FSPGX's 8.60% return.

FIBUX

• 1D: 0.00%
• 1M: 0.46%
• YTD: 0.46%
• 6M: 0.33%
• 1Y: 5.40%
• 3Y*: 4.04%
• 5Y*: 0.09%
• 10Y*: —

FSPGX

• 1D: -0.38%
• 1M: 7.10%
• YTD: 8.60%
• 6M: 7.98%
• 1Y: 27.43%
• 3Y*: 25.53%
• 5Y*: 16.03%
• 10Y*: —

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

FIBUX vs. FSPGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FIBUX Fidelity Flex U.S. Bond Index Fund	0.46%	7.20%	1.31%	5.46%	-13.41%	-2.16%	7.08%	8.58%	0.12%	3.81%
FSPGX Fidelity Large Cap Growth Index Fund	8.60%	18.54%	33.27%	42.77%	-29.17%	27.57%	38.46%	36.38%	-1.79%	19.19%

Correlation

The correlation between FIBUX and FSPGX is 0.18, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.18
Correlation (3Y) Calculated over the trailing 3-year period	0.14
Correlation (5Y) Calculated over the trailing 5-year period	0.12
Correlation (All Time) Calculated using the full available price history since Mar 10, 2017	0.02

The correlation between FIBUX and FSPGX shifts across timeframes, from 0.02 (all time) to 0.18 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

FIBUX vs. FSPGX — Risk / Return Rank

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

FIBUX

FIBUX Risk / Return Rank: 23
FIBUX Sharpe Ratio Rank: 23
FIBUX Sortino Ratio Rank: 24
FIBUX Omega Ratio Rank: 22
FIBUX Calmar Ratio Rank: 24
FIBUX Martin Ratio Rank: 21

FSPGX

FSPGX Risk / Return Rank: 32
FSPGX Sharpe Ratio Rank: 41
FSPGX Sortino Ratio Rank: 36
FSPGX Omega Ratio Rank: 37
FSPGX Calmar Ratio Rank: 22
FSPGX Martin Ratio Rank: 23

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.

FIBUX vs. FSPGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Flex U.S. Bond Index Fund (FIBUX) and Fidelity Large Cap Growth Index Fund (FSPGX). 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.

	FIBUX	FSPGX	Difference
Sharpe ratio Return per unit of total volatility	1.36	1.85	-0.49
Sortino ratio Return per unit of downside risk	2.03	2.50	-0.48
Omega ratio Gain probability vs. loss probability	1.24	1.32	-0.08
Calmar ratio Return relative to maximum drawdown	1.83	1.76	+0.07
Martin ratio Return relative to average drawdown	5.45	5.90	-0.45
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FIBUX vs. FSPGX - Sharpe Ratio Comparison

The current FIBUX Sharpe Ratio is 1.36, which is comparable to the FSPGX Sharpe Ratio of 1.85. The chart below compares the historical Sharpe Ratios of FIBUX and FSPGX, 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

	FIBUX	FSPGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.36	1.85	-0.49
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.02	0.75	-0.73
Sharpe Ratio (All Time) Calculated using the full available price history	0.35	0.90	-0.55

Drawdowns

FIBUX vs. FSPGX - Drawdown Comparison

The maximum FIBUX drawdown since its inception was -19.76%, smaller than the maximum FSPGX drawdown of -32.66%. Use the drawdown chart below to compare losses from any high point for FIBUX and FSPGX.

Drawdown Indicators

	FIBUX	FSPGX	Difference
Max Drawdown Largest peak-to-trough decline	-19.76%	-32.66%	+12.90%
Max Drawdown (1Y) Largest decline over 1 year	-2.97%	-16.17%	+13.20%
Max Drawdown (3Y) Largest decline over 3 years	-6.09%	-23.32%	+17.23%
Max Drawdown (5Y) Largest decline over 5 years	-18.40%	-32.66%	+14.26%
Current Drawdown Current decline from peak	-3.43%	-0.38%	-3.05%
Average Drawdown Average peak-to-trough decline	-5.79%	-6.37%	+0.58%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.00%	4.81%	-3.81%

Volatility

FIBUX vs. FSPGX - Volatility Comparison

The current volatility for Fidelity Flex U.S. Bond Index Fund (FIBUX) is 1.38%, while Fidelity Large Cap Growth Index Fund (FSPGX) has a volatility of 3.32%. This indicates that FIBUX experiences smaller price fluctuations and is considered to be less risky than FSPGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FIBUX	FSPGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.38%	3.32%	-1.94%
Volatility (6M) Calculated over the trailing 6-month period	2.86%	11.58%	-8.72%
Volatility (1Y) Calculated over the trailing 1-year period	4.02%	15.39%	-11.37%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.04%	21.49%	-15.45%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.11%	21.55%	-16.44%

FIBUX vs. FSPGX - Expense Ratio Comparison

FIBUX has a 0.00% expense ratio, which is lower than FSPGX's 0.04% 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

FIBUX vs. FSPGX - Dividend Comparison

FIBUX's dividend yield for the trailing twelve months is around 4.08%, more than FSPGX's 0.32% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
FIBUX Fidelity Flex U.S. Bond Index Fund	4.08%	3.95%	3.65%	2.93%	1.62%	1.18%	2.32%	2.96%	2.70%	2.45%
FSPGX Fidelity Large Cap Growth Index Fund	0.32%	0.34%	0.37%	0.73%	0.86%	2.22%	1.76%	1.04%	1.32%	0.22%

Frequently Asked Questions

Can I hold both FIBUX and FSPGX in my portfolio?

FIBUX and FSPGX have a correlation of 0.18, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FIBUX or FSPGX?

FSPGX has higher volatility (3.32%) compared to FIBUX (1.38%). In terms of maximum drawdown, FIBUX dropped -19.76% vs FSPGX's -32.66%.

Which has better risk-adjusted returns?

FSPGX currently has the higher Sharpe Ratio (1.85 vs 1.36), 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.