STMSX vs. VSCIX

Last updated Jul 22, 2026

STMSX (SEI Institutional Managed Trust Tax-Managed Small/Mid Cap Fund) and VSCIX (Vanguard Small-Cap Index Fund Institutional Shares) are both Small Cap Blend Equities funds. Over the past 10 years, STMSX returned 9.17%/yr vs 10.93%/yr for VSCIX. With a 0.98 correlation, they move nearly in lockstep. STMSX charges 1.11%/yr vs 0.03%/yr for VSCIX.

Performance

STMSX vs. VSCIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in SEI Institutional Managed Trust Tax-Managed Small/Mid Cap Fund (STMSX) and Vanguard Small-Cap Index Fund Institutional Shares (VSCIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

As of year-to-date, both investments have demonstrated similar returns, with STMSX at 14.88% and VSCIX at 14.88%. Over the past 10 years, STMSX has underperformed VSCIX with an annualized return of 9.17%, while VSCIX has yielded a comparatively higher 10.93% annualized return.

STMSX

• 1D: -0.58%
• 1M: -0.07%
• 6M: 10.27%
• YTD: 14.88%
• 1Y: 24.37%
• 3Y*: 13.79%
• 5Y*: 7.27%
• 10Y*: 9.17%
• ALL TIME*: 7.83%

VSCIX

• 1D: -0.66%
• 1M: -0.48%
• 6M: 9.03%
• YTD: 14.88%
• 1Y: 23.38%
• 3Y*: 14.35%
• 5Y*: 7.49%
• 10Y*: 10.93%
• ALL TIME*: 9.24%

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

STMSX vs. VSCIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
STMSX SEI Institutional Managed Trust Tax-Managed Small/Mid Cap Fund	14.88%	8.67%	13.34%	12.97%	-16.91%	23.68%	10.41%	21.99%	-12.34%	15.89%
VSCIX Vanguard Small-Cap Index Fund Institutional Shares	14.88%	8.85%	12.96%	19.52%	-17.60%	17.74%	19.07%	27.40%	-9.33%	16.25%

Correlation

The correlation between STMSX and VSCIX is 0.95 - 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	0.95
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	0.98
Correlation (All Time) Calculated using the full available price history since Jan 2, 2001	0.98

The correlation between STMSX and VSCIX has been stable across timeframes, ranging from 0.95 to 0.98 - a consistent structural relationship.

Return for Risk

STMSX vs. VSCIX — Risk / Return Rank

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

STMSX

STMSX Risk / Return Rank: 55
STMSX Sharpe Ratio Rank: 48
STMSX Sortino Ratio Rank: 53
STMSX Omega Ratio Rank: 43
STMSX Calmar Ratio Rank: 71
STMSX Martin Ratio Rank: 59

VSCIX

VSCIX Risk / Return Rank: 51
VSCIX Sharpe Ratio Rank: 41
VSCIX Sortino Ratio Rank: 44
VSCIX Omega Ratio Rank: 38
VSCIX Calmar Ratio Rank: 70
VSCIX Martin Ratio Rank: 63

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.

STMSX vs. VSCIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SEI Institutional Managed Trust Tax-Managed Small/Mid Cap Fund (STMSX) and Vanguard Small-Cap Index Fund Institutional Shares (VSCIX). 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.

	STMSX	VSCIX	Difference
Sharpe ratio: Return per unit of total volatility	1.45	1.38	+0.06
Sortino ratio: Return per unit of downside risk	2.18	2.04	+0.14
Omega ratio: Gain probability vs. loss probability	1.25	1.24	+0.01
Calmar ratio: Return relative to maximum drawdown	2.51	2.54	-0.03
Martin ratio: Return relative to average drawdown	8.72	9.23	-0.51

STMSX vs. VSCIX - Sharpe Ratio Comparison

The current STMSX Sharpe Ratio is 1.45, which is comparable to the VSCIX Sharpe Ratio of 1.38. The chart below compares the historical Sharpe Ratios of STMSX and VSCIX, 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

STMSX vs. VSCIX - Drawdown Comparison

The maximum STMSX drawdown since its inception was -60.78%, roughly equal to the maximum VSCIX drawdown of -59.66%. Use the drawdown chart below to compare losses from any high point for STMSX and VSCIX.

Drawdown Indicators

	STMSX	VSCIX	Difference
Max Drawdown Largest peak-to-trough decline	-60.78%	-59.66%	-1.12%
Max Drawdown (1Y) Largest decline over 1 year	-9.69%	-8.97%	-0.72%
Max Drawdown (3Y) Largest decline over 3 years	-34.36%	-25.25%	-9.11%
Max Drawdown (5Y) Largest decline over 5 years	-34.36%	-28.13%	-6.23%
Max Drawdown (10Y) Largest decline over 10 years	-43.16%	-41.81%	-1.35%
Current Drawdown Current decline from peak	-2.21%	-2.84%	+0.63%
Average Drawdown Average peak-to-trough decline	-10.57%	-10.08%	-0.49%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.78%	2.46%	+0.32%

Volatility

STMSX vs. VSCIX - Volatility Comparison

SEI Institutional Managed Trust Tax-Managed Small/Mid Cap Fund (STMSX) has a higher volatility of 3.62% compared to Vanguard Small-Cap Index Fund Institutional Shares (VSCIX) at 3.17%. This indicates that STMSX's price experiences larger fluctuations and is considered to be riskier than VSCIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	STMSX	VSCIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.62%	3.17%	+0.45%
Volatility (6M) Calculated over the trailing 6-month period	12.40%	12.05%	+0.35%
Volatility (1Y) Calculated over the trailing 1-year period	16.84%	16.48%	+0.36%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.07%	20.68%	+2.39%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.83%	21.52%	+1.31%

STMSX vs. VSCIX - Expense Ratio Comparison

STMSX has a 1.11% expense ratio, which is higher than VSCIX's 0.03% expense ratio.

Dividends

STMSX vs. VSCIX - Dividend Comparison

STMSX's dividend yield for the trailing twelve months is around 3.60%, more than VSCIX's 1.23% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
STMSX SEI Institutional Managed Trust Tax-Managed Small/Mid Cap Fund	3.60%	4.41%	21.88%	3.11%	0.84%	9.68%	0.29%	2.54%	9.26%	1.89%	0.41%	0.25%
VSCIX Vanguard Small-Cap Index Fund Institutional Shares	1.23%	1.34%	1.31%	1.55%	1.55%	1.25%	1.15%	1.40%	1.68%	1.36%	1.50%	1.49%

Frequently Asked Questions

Can I hold both STMSX and VSCIX in my portfolio?

With a correlation of 0.95, STMSX and VSCIX 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, STMSX or VSCIX?

STMSX has higher volatility (3.62%) compared to VSCIX (3.17%). In terms of maximum drawdown, STMSX dropped -60.78% vs VSCIX's -59.66%.

Which has better risk-adjusted returns?

STMSX currently has the higher Sharpe Ratio (1.45 vs 1.38), 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.