IYY vs. MGK

Last updated Jun 24, 2026

IYY (iShares Dow Jones U.S. ETF) and MGK (Vanguard Mega Cap Growth ETF) are both exchange-traded funds - IYY is a Large Cap Blend Equities fund tracking the Dow Jones U.S. Index, while MGK is a Large Cap Growth Equities fund tracking the CRSP US Mega Cap Growth Index. Both are passively managed. Over the past 10 years, IYY returned 15.08%/yr vs 18.97%/yr for MGK. Their correlation of 0.94 suggests significant overlap in exposure. IYY charges 0.20%/yr vs 0.05%/yr for MGK.

Performance

IYY vs. MGK - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Dow Jones U.S. ETF (IYY) and Vanguard Mega Cap Growth ETF (MGK). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, IYY achieves a 8.34% return, which is significantly higher than MGK's 3.65% return. Over the past 10 years, IYY has underperformed MGK with an annualized return of 15.08%, while MGK has yielded a comparatively higher 18.97% annualized return.

IYY

• 1D: -1.33%
• 1M: -1.01%
• YTD: 8.34%
• 6M: 7.27%
• 1Y: 23.31%
• 3Y*: 20.53%
• 5Y*: 12.11%
• 10Y*: 15.08%

MGK

• 1D: -2.12%
• 1M: -3.93%
• YTD: 3.65%
• 6M: 2.34%
• 1Y: 21.62%
• 3Y*: 23.33%
• 5Y*: 13.84%
• 10Y*: 18.97%

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

IYY vs. MGK - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IYY iShares Dow Jones U.S. ETF	8.34%	17.08%	24.15%	26.48%	-19.57%	26.38%	20.10%	30.78%	-5.16%	21.33%
MGK Vanguard Mega Cap Growth ETF	3.65%	20.67%	32.94%	51.67%	-33.59%	28.58%	41.01%	37.38%	-2.91%	29.49%

Correlation

The correlation between IYY and MGK is 0.91, 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	0.91
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (10Y) Calculated over the trailing 10-year period	0.92
Correlation (All Time) Calculated using the full available price history since Dec 27, 2007	0.94

The correlation between IYY and MGK has been stable across timeframes, ranging from 0.91 to 0.94 - a consistent structural relationship.

IYY vs. MGK - Sectors Allocation Comparison

Sectors	IYY	MGK
Technology	38.3%	59.0%
Financial Services	11.2%	4.1%
Communication Services	10.1%	15.8%
Consumer Cyclical	9.9%	12.2%
Industrials	8.5%	1.0%
Healthcare	8.4%	4.6%
Consumer Defensive	4.4%	0.4%
Energy	3.2%	-
Utilities	2.1%	1.0%
Real Estate	2.0%	1.1%
Basic Materials	1.9%	0.6%

Return for Risk

IYY vs. MGK — Risk / Return Rank

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

IYY

IYY Risk / Return Rank: 58
IYY Sharpe Ratio Rank: 57
IYY Sortino Ratio Rank: 55
IYY Omega Ratio Rank: 56
IYY Calmar Ratio Rank: 55
IYY Martin Ratio Rank: 66

MGK

MGK Risk / Return Rank: 33
MGK Sharpe Ratio Rank: 36
MGK Sortino Ratio Rank: 34
MGK Omega Ratio Rank: 34
MGK Calmar Ratio Rank: 27
MGK Martin Ratio Rank: 31

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.

IYY vs. MGK - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Dow Jones U.S. ETF (IYY) and Vanguard Mega Cap Growth ETF (MGK). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	IYY	MGK	Difference
Sharpe ratio: Return per unit of total volatility	1.85	1.26	+0.59
Sortino ratio: Return per unit of downside risk	2.53	1.76	+0.78
Omega ratio: Gain probability vs. loss probability	1.33	1.22	+0.11
Calmar ratio: Return relative to maximum drawdown	2.62	1.29	+1.33
Martin ratio: Return relative to average drawdown	11.61	4.31	+7.29

IYY vs. MGK - Sharpe Ratio Comparison

The current IYY Sharpe Ratio is 1.85, which is higher than the MGK Sharpe Ratio of 1.26. The chart below compares the historical Sharpe Ratios of IYY and MGK, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

IYY vs. MGK - Drawdown Comparison

The maximum IYY drawdown since its inception was -55.17%, which is greater than MGK's maximum drawdown of -48.43%. Use the drawdown chart below to compare losses from any high point for IYY and MGK.

Drawdown Indicators

	IYY	MGK	Difference
Max Drawdown Largest peak-to-trough decline	-55.17%	-48.43%	-6.74%
Max Drawdown (1Y) Largest decline over 1 year	-8.94%	-16.85%	+7.91%
Max Drawdown (3Y) Largest decline over 3 years	-19.06%	-23.36%	+4.30%
Max Drawdown (5Y) Largest decline over 5 years	-25.46%	-36.01%	+10.55%
Max Drawdown (10Y) Largest decline over 10 years	-34.90%	-36.01%	+1.11%
Current Drawdown Current decline from peak	-3.04%	-7.14%	+4.10%
Average Drawdown Average peak-to-trough decline	-10.82%	-7.58%	-3.24%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.01%	5.02%	-3.01%

Volatility

IYY vs. MGK - Volatility Comparison

The current volatility for iShares Dow Jones U.S. ETF (IYY) is 4.98%, while Vanguard Mega Cap Growth ETF (MGK) has a volatility of 7.08%. This indicates that IYY experiences smaller price fluctuations and is considered to be less risky than MGK based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IYY	MGK	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.98%	7.08%	-2.10%
Volatility (6M) Calculated over the trailing 6-month period	10.01%	13.75%	-3.74%
Volatility (1Y) Calculated over the trailing 1-year period	12.69%	17.33%	-4.64%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.23%	22.80%	-5.57%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.18%	21.96%	-3.78%

IYY vs. MGK - Expense Ratio Comparison

IYY has a 0.20% expense ratio, which is higher than MGK's 0.05% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

IYY vs. MGK - Dividend Comparison

IYY's dividend yield for the trailing twelve months is around 0.89%, more than MGK's 0.34% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IYY iShares Dow Jones U.S. ETF	0.89%	0.95%	1.05%	1.29%	1.48%	1.04%	1.31%	1.80%	1.97%	1.62%	1.81%	1.97%
MGK Vanguard Mega Cap Growth ETF	0.34%	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 IYY and MGK in my portfolio?

With a correlation of 0.91, IYY and MGK 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, IYY or MGK?

MGK has higher volatility (7.08%) compared to IYY (4.98%). In terms of maximum drawdown, IYY dropped -55.17% vs MGK's -48.43%.

Which ETF is better, IYY or MGK?

On 10-year performance, MGK leads with 18.97% vs 15.08% for IYY. On fees, MGK is cheaper at 0.05% per year. On volatility, IYY has been the lower-risk option at 4.98%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, IYY or MGK?

Over the 10-year period, MGK has performed better with a 18.97% return vs 15.08%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, IYY or MGK?

MGK is cheaper with a 0.05% expense ratio, compared with 0.20% for IYY.

Which ETF pays a higher dividend yield, IYY or MGK?

IYY has the higher dividend yield at 0.89%, compared with 0.34% for MGK.

What is the main difference between IYY and MGK?

IYY is categorized as Large Cap Blend Equities, while MGK is Large Cap Growth Equities. IYY tracks Dow Jones U.S. Index, while MGK tracks CRSP US Mega Cap Growth Index. They also come from different issuers: iShares and Vanguard. Their fees differ too: 0.20% for IYY and 0.05% for MGK.

Which has better risk-adjusted returns?

IYY currently has the higher Sharpe Ratio (1.85 vs 1.26), 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.