BMSIX vs. FDFIX

Last updated Jun 3, 2026

BMSIX (BlackRock Income Fund) and FDFIX (Fidelity Flex 500 Index Fund) are both mutual funds - BMSIX is a Multisector Bonds fund managed by BlackRock, while FDFIX is a Large Cap Blend Equities fund managed by Fidelity. Over the past 5 years, BMSIX returned 1.81%/yr vs 14.07%/yr for FDFIX. At a 0.30 correlation, their price movements are largely independent. BMSIX charges 0.62%/yr vs 0.00%/yr for FDFIX.

Performance

BMSIX vs. FDFIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in BlackRock Income Fund (BMSIX) and Fidelity Flex 500 Index Fund (FDFIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BMSIX achieves a 0.46% return, which is significantly lower than FDFIX's 11.29% return.

BMSIX

• 1D: -0.11%
• 1M: 0.21%
• YTD: 0.46%
• 6M: 1.06%
• 1Y: 6.10%
• 3Y*: 6.99%
• 5Y*: 1.81%
• 10Y*: 3.83%

FDFIX

• 1D: 0.28%
• 1M: 5.37%
• YTD: 11.29%
• 6M: 11.56%
• 1Y: 28.97%
• 3Y*: 22.53%
• 5Y*: 14.07%
• 10Y*: —

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

BMSIX vs. FDFIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BMSIX BlackRock Income Fund	0.46%	8.38%	5.96%	7.84%	-10.08%	-0.29%	6.94%	12.03%	-1.03%	5.34%
FDFIX Fidelity Flex 500 Index Fund	11.29%	17.59%	25.06%	26.27%	-18.10%	28.69%	18.46%	31.47%	-4.45%	14.41%

Correlation

The correlation between BMSIX and FDFIX is 0.44, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.44
Correlation (3Y) Calculated over the trailing 3-year period	0.27
Correlation (5Y) Calculated over the trailing 5-year period	0.31
Correlation (All Time) Calculated using the full available price history since Mar 10, 2017	0.30

The correlation between BMSIX and FDFIX shifts across timeframes, from 0.27 (3 years) to 0.44 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

BMSIX vs. FDFIX — Risk / Return Rank

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

BMSIX

BMSIX Risk / Return Rank: 57
BMSIX Sharpe Ratio Rank: 51
BMSIX Sortino Ratio Rank: 70
BMSIX Omega Ratio Rank: 64
BMSIX Calmar Ratio Rank: 47
BMSIX Martin Ratio Rank: 55

FDFIX

FDFIX Risk / Return Rank: 72
FDFIX Sharpe Ratio Rank: 74
FDFIX Sortino Ratio Rank: 65
FDFIX Omega Ratio Rank: 65
FDFIX Calmar Ratio Rank: 73
FDFIX Martin Ratio Rank: 81

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.

BMSIX vs. FDFIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BlackRock Income Fund (BMSIX) and Fidelity Flex 500 Index Fund (FDFIX). 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.

	BMSIX	FDFIX	Difference
Sharpe ratio Return per unit of total volatility	2.11	2.49	-0.38
Sortino ratio Return per unit of downside risk	3.50	3.37	+0.13
Omega ratio Gain probability vs. loss probability	1.45	1.45	0.00
Calmar ratio Return relative to maximum drawdown	2.63	3.34	-0.71
Martin ratio Return relative to average drawdown	11.25	15.29	-4.04
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BMSIX vs. FDFIX - Sharpe Ratio Comparison

The current BMSIX Sharpe Ratio is 2.11, which is comparable to the FDFIX Sharpe Ratio of 2.49. The chart below compares the historical Sharpe Ratios of BMSIX and FDFIX, 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

	BMSIX	FDFIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.11	2.49	-0.38
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.48	0.84	-0.35
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.93	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.22	0.82	+0.40

Drawdowns

BMSIX vs. FDFIX - Drawdown Comparison

The maximum BMSIX drawdown since its inception was -18.60%, smaller than the maximum FDFIX drawdown of -33.77%. Use the drawdown chart below to compare losses from any high point for BMSIX and FDFIX.

Drawdown Indicators

	BMSIX	FDFIX	Difference
Max Drawdown Largest peak-to-trough decline	-18.60%	-33.77%	+15.17%
Max Drawdown (1Y) Largest decline over 1 year	-2.51%	-8.99%	+6.48%
Max Drawdown (3Y) Largest decline over 3 years	-2.58%	-18.76%	+16.18%
Max Drawdown (5Y) Largest decline over 5 years	-16.52%	-24.51%	+7.99%
Max Drawdown (10Y) Largest decline over 10 years	-18.60%	—	—
Current Drawdown Current decline from peak	-0.26%	0.00%	-0.26%
Average Drawdown Average peak-to-trough decline	-2.04%	-4.58%	+2.54%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.59%	1.97%	-1.38%

Volatility

BMSIX vs. FDFIX - Volatility Comparison

The current volatility for BlackRock Income Fund (BMSIX) is 1.01%, while Fidelity Flex 500 Index Fund (FDFIX) has a volatility of 2.92%. This indicates that BMSIX experiences smaller price fluctuations and is considered to be less risky than FDFIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BMSIX	FDFIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.01%	2.92%	-1.91%
Volatility (6M) Calculated over the trailing 6-month period	2.33%	9.05%	-6.72%
Volatility (1Y) Calculated over the trailing 1-year period	2.85%	11.98%	-9.13%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.76%	16.95%	-13.19%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.15%	18.59%	-14.44%

BMSIX vs. FDFIX - Expense Ratio Comparison

BMSIX has a 0.62% expense ratio, which is higher than FDFIX's 0.00% expense ratio.

Dividends

BMSIX vs. FDFIX - Dividend Comparison

BMSIX's dividend yield for the trailing twelve months is around 5.63%, more than FDFIX's 1.03% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BMSIX BlackRock Income Fund	5.63%	5.66%	5.99%	4.38%	3.71%	5.31%	4.19%	4.90%	5.13%	4.03%	4.49%	4.35%
FDFIX Fidelity Flex 500 Index Fund	1.03%	1.11%	1.26%	1.48%	1.70%	1.27%	1.52%	1.78%	2.16%	0.50%	0.00%	0.00%

Frequently Asked Questions

Can I hold both BMSIX and FDFIX in my portfolio?

BMSIX and FDFIX have a correlation of 0.44, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BMSIX or FDFIX?

FDFIX has higher volatility (2.92%) compared to BMSIX (1.01%). In terms of maximum drawdown, BMSIX dropped -18.60% vs FDFIX's -33.77%.

Which has better risk-adjusted returns?

FDFIX currently has the higher Sharpe Ratio (2.49 vs 2.11), 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.