BASMX vs. FGRTX

Last updated Jun 4, 2026

BASMX (iShares Total U.S. Stock Market Index Fund Investor A Shares) and FGRTX (Fidelity Mega Cap Stock Fund) are both Large Cap Blend Equities funds. Over the past 10 years, BASMX returned 14.79%/yr vs 16.48%/yr for FGRTX. Their correlation of 0.93 suggests significant overlap in exposure. BASMX charges 0.33%/yr vs 0.61%/yr for FGRTX.

Performance

BASMX vs. FGRTX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX) and Fidelity Mega Cap Stock Fund (FGRTX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BASMX achieves a 11.60% return, which is significantly higher than FGRTX's 10.50% return. Over the past 10 years, BASMX has underperformed FGRTX with an annualized return of 14.79%, while FGRTX has yielded a comparatively higher 16.48% annualized return.

BASMX

• 1D: 0.23%
• 1M: 5.66%
• YTD: 11.60%
• 6M: 11.46%
• 1Y: 28.31%
• 3Y*: 21.93%
• 5Y*: 12.79%
• 10Y*: 14.79%

FGRTX

• 1D: -0.32%
• 1M: 3.41%
• YTD: 10.50%
• 6M: 12.42%
• 1Y: 31.38%
• 3Y*: 25.59%
• 5Y*: 16.32%
• 10Y*: 16.48%

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

BASMX vs. FGRTX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BASMX iShares Total U.S. Stock Market Index Fund Investor A Shares	11.60%	16.81%	23.46%	25.63%	-19.32%	25.26%	20.37%	30.71%	-5.57%	20.65%
FGRTX Fidelity Mega Cap Stock Fund	10.50%	26.92%	25.98%	26.51%	-8.98%	26.29%	12.96%	31.07%	-7.44%	16.98%

Correlation

The correlation between BASMX and FGRTX is 0.93, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.94
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	0.93

The correlation between BASMX and FGRTX has been stable across timeframes, ranging from 0.93 to 0.94 - a consistent structural relationship.

Return for Risk

BASMX vs. FGRTX — Risk / Return Rank

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

BASMX

BASMX Risk / Return Rank: 68
BASMX Sharpe Ratio Rank: 68
BASMX Sortino Ratio Rank: 62
BASMX Omega Ratio Rank: 61
BASMX Calmar Ratio Rank: 71
BASMX Martin Ratio Rank: 80

FGRTX

FGRTX Risk / Return Rank: 80
FGRTX Sharpe Ratio Rank: 84
FGRTX Sortino Ratio Rank: 78
FGRTX Omega Ratio Rank: 75
FGRTX Calmar Ratio Rank: 79
FGRTX Martin Ratio Rank: 85

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.

BASMX vs. FGRTX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX) and Fidelity Mega Cap Stock Fund (FGRTX). 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.

	BASMX	FGRTX	Difference
Sharpe ratio Return per unit of total volatility	2.41	2.70	-0.29
Sortino ratio Return per unit of downside risk	3.30	3.70	-0.40
Omega ratio Gain probability vs. loss probability	1.43	1.49	-0.06
Calmar ratio Return relative to maximum drawdown	3.29	3.59	-0.31
Martin ratio Return relative to average drawdown	15.07	16.31	-1.25
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BASMX vs. FGRTX - Sharpe Ratio Comparison

The current BASMX Sharpe Ratio is 2.41, which is comparable to the FGRTX Sharpe Ratio of 2.70. The chart below compares the historical Sharpe Ratios of BASMX and FGRTX, 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

	BASMX	FGRTX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.41	2.70	-0.29
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.74	0.98	-0.24
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.81	0.91	-0.11
Sharpe Ratio (All Time) Calculated using the full available price history	0.81	0.48	+0.33

Drawdowns

BASMX vs. FGRTX - Drawdown Comparison

The maximum BASMX drawdown since its inception was -34.95%, smaller than the maximum FGRTX drawdown of -56.17%. Use the drawdown chart below to compare losses from any high point for BASMX and FGRTX.

Drawdown Indicators

	BASMX	FGRTX	Difference
Max Drawdown Largest peak-to-trough decline	-34.95%	-56.17%	+21.22%
Max Drawdown (1Y) Largest decline over 1 year	-8.92%	-8.99%	+0.07%
Max Drawdown (3Y) Largest decline over 3 years	-19.32%	-18.51%	-0.81%
Max Drawdown (5Y) Largest decline over 5 years	-25.12%	-23.35%	-1.77%
Max Drawdown (10Y) Largest decline over 10 years	-34.95%	-35.18%	+0.23%
Current Drawdown Current decline from peak	0.00%	-0.32%	+0.32%
Average Drawdown Average peak-to-trough decline	-4.59%	-8.72%	+4.13%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.94%	1.98%	-0.04%

Volatility

BASMX vs. FGRTX - Volatility Comparison

iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX) has a higher volatility of 2.94% compared to Fidelity Mega Cap Stock Fund (FGRTX) at 2.71%. This indicates that BASMX's price experiences larger fluctuations and is considered to be riskier than FGRTX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BASMX	FGRTX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.94%	2.71%	+0.23%
Volatility (6M) Calculated over the trailing 6-month period	9.15%	9.06%	+0.09%
Volatility (1Y) Calculated over the trailing 1-year period	12.14%	11.98%	+0.16%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.38%	16.70%	+0.68%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.41%	18.12%	+0.29%

BASMX vs. FGRTX - Expense Ratio Comparison

BASMX has a 0.33% expense ratio, which is lower than FGRTX's 0.61% expense ratio.

Dividends

BASMX vs. FGRTX - Dividend Comparison

BASMX's dividend yield for the trailing twelve months is around 0.78%, less than FGRTX's 3.52% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BASMX iShares Total U.S. Stock Market Index Fund Investor A Shares	0.78%	0.86%	0.99%	1.19%	1.33%	1.33%	1.20%	1.90%	2.18%	1.93%	1.37%	0.00%
FGRTX Fidelity Mega Cap Stock Fund	3.52%	3.89%	2.68%	2.06%	4.38%	4.79%	7.96%	12.98%	21.72%	15.57%	1.97%	4.16%

Frequently Asked Questions

Can I hold both BASMX and FGRTX in my portfolio?

With a correlation of 0.93, BASMX and FGRTX 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, BASMX or FGRTX?

BASMX has higher volatility (2.94%) compared to FGRTX (2.71%). In terms of maximum drawdown, BASMX dropped -34.95% vs FGRTX's -56.17%.

Which has better risk-adjusted returns?

FGRTX currently has the higher Sharpe Ratio (2.70 vs 2.41), 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.