MGK vs. FGRTX

Last updated Jun 4, 2026

MGK (Vanguard Mega Cap Growth ETF) and FGRTX (Fidelity Mega Cap Stock Fund) are both funds - MGK is a Large Cap Growth Equities fund tracking the CRSP US Mega Cap Growth Index, while FGRTX is a Large Cap Blend Equities fund managed by Fidelity. Over the past 10 years, MGK returned 19.24%/yr vs 16.48%/yr for FGRTX. Their correlation of 0.87 suggests significant overlap in exposure. MGK charges 0.05%/yr vs 0.61%/yr for FGRTX.

Performance

MGK vs. FGRTX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Mega Cap Growth ETF (MGK) and Fidelity Mega Cap Stock Fund (FGRTX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with MGK having a 10.01% return and FGRTX slightly higher at 10.50%. Over the past 10 years, MGK has outperformed FGRTX with an annualized return of 19.24%, while FGRTX has yielded a comparatively lower 16.48% annualized return.

MGK

• 1D: -1.13%
• 1M: 7.26%
• YTD: 10.01%
• 6M: 9.45%
• 1Y: 30.01%
• 3Y*: 26.77%
• 5Y*: 16.25%
• 10Y*: 19.24%

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)

MGK vs. FGRTX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MGK Vanguard Mega Cap Growth ETF	10.01%	20.67%	32.94%	51.67%	-33.59%	28.58%	41.01%	37.38%	-2.91%	29.49%
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 MGK and FGRTX is 0.87, 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	0.87
Correlation (3Y) Calculated over the trailing 3-year period	0.86
Correlation (5Y) Calculated over the trailing 5-year period	0.84
Correlation (10Y) Calculated over the trailing 10-year period	0.80
Correlation (All Time) Calculated using the full available price history since Dec 28, 2007	0.87

The correlation between MGK and FGRTX has been stable across timeframes, ranging from 0.80 to 0.87 - a consistent structural relationship.

Return for Risk

MGK vs. FGRTX — Risk / Return Rank

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

MGK

MGK Risk / Return Rank: 45
MGK Sharpe Ratio Rank: 53
MGK Sortino Ratio Rank: 50
MGK Omega Ratio Rank: 50
MGK Calmar Ratio Rank: 35
MGK Martin Ratio Rank: 38

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.

MGK vs. FGRTX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Mega Cap Growth ETF (MGK) 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.

	MGK	FGRTX	Difference
Sharpe ratio Return per unit of total volatility	1.86	2.70	-0.84
Sortino ratio Return per unit of downside risk	2.53	3.70	-1.17
Omega ratio Gain probability vs. loss probability	1.32	1.49	-0.17
Calmar ratio Return relative to maximum drawdown	1.79	3.59	-1.80
Martin ratio Return relative to average drawdown	6.15	16.31	-10.16
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MGK vs. FGRTX - Sharpe Ratio Comparison

The current MGK Sharpe Ratio is 1.86, which is lower than the FGRTX Sharpe Ratio of 2.70. The chart below compares the historical Sharpe Ratios of MGK 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

	MGK	FGRTX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.86	2.70	-0.84
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.72	0.98	-0.26
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.88	0.91	-0.03
Sharpe Ratio (All Time) Calculated using the full available price history	0.66	0.48	+0.18

Drawdowns

MGK vs. FGRTX - Drawdown Comparison

The maximum MGK drawdown since its inception was -47.97%, smaller than the maximum FGRTX drawdown of -56.17%. Use the drawdown chart below to compare losses from any high point for MGK and FGRTX.

Drawdown Indicators

	MGK	FGRTX	Difference
Max Drawdown Largest peak-to-trough decline	-47.97%	-56.17%	+8.20%
Max Drawdown (1Y) Largest decline over 1 year	-16.85%	-8.99%	-7.86%
Max Drawdown (3Y) Largest decline over 3 years	-23.36%	-18.51%	-4.85%
Max Drawdown (5Y) Largest decline over 5 years	-36.01%	-23.35%	-12.66%
Max Drawdown (10Y) Largest decline over 10 years	-36.01%	-35.18%	-0.83%
Current Drawdown Current decline from peak	-1.43%	-0.32%	-1.11%
Average Drawdown Average peak-to-trough decline	-7.47%	-8.72%	+1.25%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.89%	1.98%	+2.91%

Volatility

MGK vs. FGRTX - Volatility Comparison

Vanguard Mega Cap Growth ETF (MGK) has a higher volatility of 4.01% compared to Fidelity Mega Cap Stock Fund (FGRTX) at 2.71%. This indicates that MGK'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

	MGK	FGRTX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.01%	2.71%	+1.30%
Volatility (6M) Calculated over the trailing 6-month period	12.37%	9.06%	+3.31%
Volatility (1Y) Calculated over the trailing 1-year period	16.23%	11.98%	+4.25%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.63%	16.70%	+5.93%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.88%	18.12%	+3.76%

MGK vs. FGRTX - Expense Ratio Comparison

MGK has a 0.05% expense ratio, which is lower than FGRTX's 0.61% expense ratio.

Dividends

MGK vs. FGRTX - Dividend Comparison

MGK's dividend yield for the trailing twelve months is around 0.32%, less than FGRTX's 3.52% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%
MGK Vanguard Mega Cap Growth ETF	0.32%	0.35%	0.43%	0.50%	0.70%	0.41%	0.65%	0.85%	1.12%	1.23%	1.53%	1.43%

Frequently Asked Questions

Can I hold both MGK and FGRTX in my portfolio?

MGK and FGRTX have a correlation of 0.87, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MGK or FGRTX?

MGK has higher volatility (4.01%) compared to FGRTX (2.71%). In terms of maximum drawdown, MGK dropped -47.97% vs FGRTX's -56.17%.

Which has better risk-adjusted returns?

FGRTX currently has the higher Sharpe Ratio (2.70 vs 1.86), 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.