MFSG vs. IUSG

Last updated Jun 4, 2026

MFSG (MFS Active Growth ETF) and IUSG (iShares Core S&P U.S. Growth ETF) are both Large Cap Growth Equities funds. MFSG is actively managed, while IUSG is passively managed. Over the past year, MFSG returned 21.54% vs 33.89% for IUSG. With a 0.96 correlation, they move nearly in lockstep. MFSG charges 0.49%/yr vs 0.04%/yr for IUSG.

Performance

MFSG vs. IUSG - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Active Growth ETF (MFSG) and iShares Core S&P U.S. Growth ETF (IUSG). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MFSG achieves a 7.55% return, which is significantly lower than IUSG's 14.08% return.

MFSG

• 1D: -0.94%
• 1M: 4.46%
• YTD: 7.55%
• 6M: 7.63%
• 1Y: 21.54%
• 3Y*: —
• 5Y*: —
• 10Y*: —

IUSG

• 1D: -0.89%
• 1M: 7.35%
• YTD: 14.08%
• 6M: 13.91%
• 1Y: 33.89%
• 3Y*: 27.59%
• 5Y*: 15.69%
• 10Y*: 17.88%

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

MFSG vs. IUSG - Yearly Performance Comparison

	2026 (YTD)	2025	2024
MFSG MFS Active Growth ETF	7.55%	14.51%	-2.74%
IUSG iShares Core S&P U.S. Growth ETF	14.08%	21.23%	-1.88%

Correlation

The correlation between MFSG and IUSG is 0.96 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.96
Correlation (All Time) Calculated using the full available price history since Dec 6, 2024	0.96

The correlation between MFSG and IUSG has been stable across timeframes, ranging from 0.96 to 0.96 - a consistent structural relationship.

Return for Risk

MFSG vs. IUSG — Risk / Return Rank

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

MFSG

MFSG Risk / Return Rank: 35
MFSG Sharpe Ratio Rank: 39
MFSG Sortino Ratio Rank: 37
MFSG Omega Ratio Rank: 37
MFSG Calmar Ratio Rank: 28
MFSG Martin Ratio Rank: 32

IUSG

IUSG Risk / Return Rank: 59
IUSG Sharpe Ratio Rank: 64
IUSG Sortino Ratio Rank: 61
IUSG Omega Ratio Rank: 60
IUSG Calmar Ratio Rank: 52
IUSG Martin Ratio Rank: 61

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.

MFSG vs. IUSG - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Active Growth ETF (MFSG) and iShares Core S&P U.S. Growth ETF (IUSG). 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.

	MFSG	IUSG	Difference
Sharpe ratio: Return per unit of total volatility	1.35	2.17	-0.81
Sortino ratio: Return per unit of downside risk	1.90	2.93	-1.03
Omega ratio: Gain probability vs. loss probability	1.24	1.37	-0.13
Calmar ratio: Return relative to maximum drawdown	1.34	2.61	-1.27
Martin ratio: Return relative to average drawdown	4.66	11.09	-6.42
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MFSG vs. IUSG - Sharpe Ratio Comparison

The current MFSG Sharpe Ratio is 1.35, which is lower than the IUSG Sharpe Ratio of 2.17. The chart below compares the historical Sharpe Ratios of MFSG and IUSG, 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

	MFSG	IUSG	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.35	2.17	-0.81
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.76	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.88	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.60	0.38	+0.22

Drawdowns

MFSG vs. IUSG - Drawdown Comparison

The maximum MFSG drawdown since its inception was -23.24%, smaller than the maximum IUSG drawdown of -63.41%. Use the drawdown chart below to compare losses from any high point for MFSG and IUSG.

Drawdown Indicators

	MFSG	IUSG	Difference
Max Drawdown Largest peak-to-trough decline	-23.24%	-63.41%	+40.17%
Max Drawdown (1Y) Largest decline over 1 year	-16.15%	-13.07%	-3.08%
Max Drawdown (3Y) Largest decline over 3 years	—	-22.28%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-32.21%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-32.35%	—
Current Drawdown Current decline from peak	-1.01%	-0.98%	-0.03%
Average Drawdown Average peak-to-trough decline	-4.67%	-21.44%	+16.77%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.63%	3.06%	+1.57%

Volatility

MFSG vs. IUSG - Volatility Comparison

The current volatility for MFS Active Growth ETF (MFSG) is 3.71%, while iShares Core S&P U.S. Growth ETF (IUSG) has a volatility of 4.23%. This indicates that MFSG experiences smaller price fluctuations and is considered to be less risky than IUSG based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MFSG	IUSG	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.71%	4.23%	-0.52%
Volatility (6M) Calculated over the trailing 6-month period	12.41%	12.23%	+0.18%
Volatility (1Y) Calculated over the trailing 1-year period	16.00%	15.72%	+0.28%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.69%	20.87%	+0.82%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.69%	20.40%	+1.29%

MFSG vs. IUSG - Expense Ratio Comparison

MFSG has a 0.49% expense ratio, which is higher than IUSG's 0.04% expense ratio.

Dividends

MFSG vs. IUSG - Dividend Comparison

MFSG's dividend yield for the trailing twelve months is around 0.07%, less than IUSG's 0.47% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IUSG iShares Core S&P U.S. Growth ETF	0.47%	0.53%	0.59%	1.12%	1.07%	0.59%	0.93%	1.64%	1.32%	1.28%	1.48%	1.29%
MFSG MFS Active Growth ETF	0.07%	0.08%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both MFSG and IUSG in my portfolio?

With a correlation of 0.96, MFSG and IUSG 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, MFSG or IUSG?

IUSG has higher volatility (4.23%) compared to MFSG (3.71%). In terms of maximum drawdown, MFSG dropped -23.24% vs IUSG's -63.41%.

Which ETF is better, MFSG or IUSG?

On 1-year performance, IUSG leads with 33.89% vs 21.54% for MFSG. On fees, IUSG is cheaper at 0.04% per year. On volatility, MFSG has been the lower-risk option at 3.71%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, MFSG or IUSG?

Over the 1-year period, IUSG has performed better with a 33.89% return vs 21.54%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, MFSG or IUSG?

IUSG is cheaper with a 0.04% expense ratio, compared with 0.49% for MFSG.

Which ETF pays a higher dividend yield, MFSG or IUSG?

IUSG has the higher dividend yield at 0.47%, compared with 0.07% for MFSG.

What is the main difference between MFSG and IUSG?

They also come from different issuers: MFS and iShares. Their fees differ too: 0.49% for MFSG and 0.04% for IUSG.

Which has better risk-adjusted returns?

IUSG currently has the higher Sharpe Ratio (2.17 vs 1.35), 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.