MNDIX vs. VSGIX

Last updated Jun 24, 2026

MNDIX (MFS New Discovery Fund) and VSGIX (Vanguard Small-Cap Growth Index Fund Institutional Shares) are both Small Cap Growth Equities funds. Over the past 10 years, MNDIX returned 12.25%/yr vs 12.21%/yr for VSGIX. With a 0.96 correlation, they move nearly in lockstep. MNDIX charges 0.99%/yr vs 0.06%/yr for VSGIX.

Performance

MNDIX vs. VSGIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS New Discovery Fund (MNDIX) and Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MNDIX achieves a 13.77% return, which is significantly lower than VSGIX's 18.75% return. Both investments have delivered pretty close results over the past 10 years, with MNDIX having a 12.25% annualized return and VSGIX not far behind at 12.21%.

MNDIX

• 1D: 0.33%
• 1M: 4.64%
• YTD: 13.77%
• 6M: 10.86%
• 1Y: 26.18%
• 3Y*: 13.57%
• 5Y*: 0.55%
• 10Y*: 12.25%

VSGIX

• 1D: 0.31%
• 1M: 3.11%
• YTD: 18.75%
• 6M: 15.73%
• 1Y: 32.50%
• 3Y*: 18.22%
• 5Y*: 5.13%
• 10Y*: 12.21%

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

MNDIX vs. VSGIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MNDIX MFS New Discovery Fund	13.77%	12.62%	6.32%	14.30%	-29.64%	2.03%	45.14%	41.12%	-1.41%	26.27%
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	18.75%	8.44%	14.95%	23.07%	-28.39%	5.70%	35.29%	32.77%	-5.70%	21.94%

Correlation

The correlation between MNDIX and VSGIX is 0.95, 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	0.95
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.97
Correlation (10Y) Calculated over the trailing 10-year period	0.96
Correlation (All Time) Calculated using the full available price history since May 24, 2000	0.96

The correlation between MNDIX and VSGIX has been stable across timeframes, ranging from 0.95 to 0.97 - a consistent structural relationship.

Return for Risk

MNDIX vs. VSGIX — Risk / Return Rank

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

MNDIX

MNDIX Risk / Return Rank: 29
MNDIX Sharpe Ratio Rank: 26
MNDIX Sortino Ratio Rank: 25
MNDIX Omega Ratio Rank: 24
MNDIX Calmar Ratio Rank: 33
MNDIX Martin Ratio Rank: 37

VSGIX

VSGIX Risk / Return Rank: 45
VSGIX Sharpe Ratio Rank: 38
VSGIX Sortino Ratio Rank: 35
VSGIX Omega Ratio Rank: 32
VSGIX Calmar Ratio Rank: 64
VSGIX Martin Ratio Rank: 58

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.

MNDIX vs. VSGIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS New Discovery Fund (MNDIX) and Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX). 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.

	MNDIX	VSGIX	Difference
Sharpe ratio: Return per unit of total volatility	1.36	1.65	-0.29
Sortino ratio: Return per unit of downside risk	1.96	2.29	-0.33
Omega ratio: Gain probability vs. loss probability	1.24	1.28	-0.04
Calmar ratio: Return relative to maximum drawdown	2.04	2.94	-0.90
Martin ratio: Return relative to average drawdown	7.67	11.01	-3.34

MNDIX vs. VSGIX - Sharpe Ratio Comparison

The current MNDIX Sharpe Ratio is 1.36, which is comparable to the VSGIX Sharpe Ratio of 1.65. The chart below compares the historical Sharpe Ratios of MNDIX and VSGIX, 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

MNDIX vs. VSGIX - Drawdown Comparison

The maximum MNDIX drawdown since its inception was -62.02%, which is greater than VSGIX's maximum drawdown of -58.66%. Use the drawdown chart below to compare losses from any high point for MNDIX and VSGIX.

Drawdown Indicators

	MNDIX	VSGIX	Difference
Max Drawdown Largest peak-to-trough decline	-62.02%	-58.66%	-3.36%
Max Drawdown (1Y) Largest decline over 1 year	-13.42%	-11.38%	-2.04%
Max Drawdown (3Y) Largest decline over 3 years	-25.32%	-27.47%	+2.15%
Max Drawdown (5Y) Largest decline over 5 years	-42.04%	-38.36%	-3.68%
Max Drawdown (10Y) Largest decline over 10 years	-42.04%	-38.70%	-3.34%
Current Drawdown Current decline from peak	-2.97%	0.00%	-2.97%
Average Drawdown Average peak-to-trough decline	-16.80%	-11.32%	-5.48%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.56%	3.04%	+0.52%

Volatility

MNDIX vs. VSGIX - Volatility Comparison

MFS New Discovery Fund (MNDIX) and Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX) have volatilities of 6.84% and 6.94%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MNDIX	VSGIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.84%	6.94%	-0.10%
Volatility (6M) Calculated over the trailing 6-month period	15.81%	15.80%	+0.01%
Volatility (1Y) Calculated over the trailing 1-year period	20.17%	20.32%	-0.15%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.97%	23.70%	-0.73%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.13%	23.06%	-0.93%

MNDIX vs. VSGIX - Expense Ratio Comparison

MNDIX has a 0.99% expense ratio, which is higher than VSGIX's 0.06% expense ratio.

Dividends

MNDIX vs. VSGIX - Dividend Comparison

MNDIX has not paid dividends to shareholders, while VSGIX's dividend yield for the trailing twelve months is around 0.45%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MNDIX MFS New Discovery Fund	0.00%	0.00%	0.00%	0.00%	0.09%	20.76%	9.22%	7.01%	23.11%	9.34%	2.24%	0.00%
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	0.45%	0.55%	0.55%	0.68%	0.56%	0.37%	0.45%	0.58%	0.80%	0.82%	1.09%	0.98%

Frequently Asked Questions

Can I hold both MNDIX and VSGIX in my portfolio?

With a correlation of 0.95, MNDIX and VSGIX 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, MNDIX or VSGIX?

VSGIX has higher volatility (6.94%) compared to MNDIX (6.84%). In terms of maximum drawdown, MNDIX dropped -62.02% vs VSGIX's -58.66%.

Which has better risk-adjusted returns?

VSGIX currently has the higher Sharpe Ratio (1.65 vs 1.36), 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.