MIGNX vs. FSPGX

Last updated Apr 1, 2026

Compare and contrast key facts about MFS Massachusetts Investors Growth Stock Fund Class R6 (MIGNX) and Fidelity Large Cap Growth Index Fund (FSPGX).

MIGNX is a passively managed fund by MFS that tracks the performance of the Russell 1000 Growth Index. It was launched on Jun 1, 2012. FSPGX is managed by Fidelity.

Performance

MIGNX vs. FSPGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Massachusetts Investors Growth Stock Fund Class R6 (MIGNX) and Fidelity Large Cap Growth Index Fund (FSPGX). The values are adjusted to include any dividend payments, if applicable.

MIGNX vs. FSPGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MIGNX MFS Massachusetts Investors Growth Stock Fund Class R6	-11.85%	10.31%	27.60%	24.51%	-18.92%	26.52%	22.96%	40.34%	1.14%	27.93%
FSPGX Fidelity Large Cap Growth Index Fund	-13.03%	18.54%	33.27%	42.77%	-29.17%	27.57%	38.46%	36.38%	-1.79%	27.70%

Returns By Period

In the year-to-date period, MIGNX achieves a -11.85% return, which is significantly higher than FSPGX's -13.03% return.

MIGNX

• 1D: -0.21%
• 1M: -9.00%
• YTD: -11.85%
• 6M: -10.61%
• 1Y: 2.43%
• 3Y*: 12.73%
• 5Y*: 8.87%
• 10Y*: 13.69%

FSPGX

• 1D: -0.45%
• 1M: -8.63%
• YTD: -13.03%
• 6M: -12.06%
• 1Y: 14.49%
• 3Y*: 19.68%
• 5Y*: 11.91%
• 10Y*: —

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

MIGNX vs. FSPGX - Expense Ratio Comparison

MIGNX has a 0.37% expense ratio, which is higher than FSPGX's 0.04% expense ratio.

MIGNX

MFS Massachusetts Investors Growth Stock Fund Class R6

FSPGX

Fidelity Large Cap Growth Index Fund

Return for Risk

MIGNX vs. FSPGX — Risk / Return Rank

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

MIGNX

MIGNX Risk / Return Rank: 8
MIGNX Sharpe Ratio Rank: 9
MIGNX Sortino Ratio Rank: 9
MIGNX Omega Ratio Rank: 9
MIGNX Calmar Ratio Rank: 7
MIGNX Martin Ratio Rank: 7

FSPGX

FSPGX Risk / Return Rank: 28
FSPGX Sharpe Ratio Rank: 29
FSPGX Sortino Ratio Rank: 33
FSPGX Omega Ratio Rank: 32
FSPGX Calmar Ratio Rank: 25
FSPGX Martin Ratio Rank: 23

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.

MIGNX vs. FSPGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Massachusetts Investors Growth Stock Fund Class R6 (MIGNX) and Fidelity Large Cap Growth Index Fund (FSPGX). 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.

	MIGNX	FSPGX	Difference
Sharpe ratio Return per unit of total volatility	0.16	0.66	-0.50
Sortino ratio Return per unit of downside risk	0.36	1.10	-0.74
Omega ratio Gain probability vs. loss probability	1.05	1.15	-0.11
Calmar ratio Return relative to maximum drawdown	0.07	0.72	-0.65
Martin ratio Return relative to average drawdown	0.24	2.51	-2.27
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MIGNX vs. FSPGX - Sharpe Ratio Comparison

The current MIGNX Sharpe Ratio is 0.16, which is lower than the FSPGX Sharpe Ratio of 0.66. The chart below compares the historical Sharpe Ratios of MIGNX and FSPGX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	MIGNX	FSPGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.16	0.66	-0.50
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.51	0.56	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.76	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.83	0.78	+0.05

Correlation

The correlation between MIGNX and FSPGX is 0.92, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

MIGNX vs. FSPGX - Dividend Comparison

MIGNX's dividend yield for the trailing twelve months is around 12.65%, more than FSPGX's 0.40% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MIGNX MFS Massachusetts Investors Growth Stock Fund Class R6	12.65%	11.15%	16.98%	4.25%	4.67%	10.36%	7.48%	7.46%	10.83%	7.02%	4.99%	6.73%
FSPGX Fidelity Large Cap Growth Index Fund	0.40%	0.34%	0.37%	0.73%	0.86%	2.22%	1.76%	1.04%	1.32%	0.22%	0.00%	0.00%

Drawdowns

MIGNX vs. FSPGX - Drawdown Comparison

The maximum MIGNX drawdown since its inception was -32.40%, roughly equal to the maximum FSPGX drawdown of -32.66%. Use the drawdown chart below to compare losses from any high point for MIGNX and FSPGX.

Drawdown Indicators

	MIGNX	FSPGX	Difference
Max Drawdown Largest peak-to-trough decline	-32.40%	-32.66%	+0.26%
Max Drawdown (1Y) Largest decline over 1 year	-13.68%	-16.17%	+2.49%
Max Drawdown (5Y) Largest decline over 5 years	-26.48%	-32.66%	+6.18%
Max Drawdown (10Y) Largest decline over 10 years	-32.40%	—	—
Current Drawdown Current decline from peak	-13.68%	-16.17%	+2.49%
Average Drawdown Average peak-to-trough decline	-3.87%	-6.43%	+2.56%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.74%	4.63%	-0.89%

Volatility

MIGNX vs. FSPGX - Volatility Comparison

The current volatility for MFS Massachusetts Investors Growth Stock Fund Class R6 (MIGNX) is 4.33%, while Fidelity Large Cap Growth Index Fund (FSPGX) has a volatility of 5.33%. This indicates that MIGNX experiences smaller price fluctuations and is considered to be less risky than FSPGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MIGNX	FSPGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.33%	5.33%	-1.00%
Volatility (6M) Calculated over the trailing 6-month period	9.34%	11.79%	-2.45%
Volatility (1Y) Calculated over the trailing 1-year period	17.63%	22.32%	-4.69%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.44%	21.46%	-4.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.16%	21.63%	-3.47%