VBMFX vs. SCOAX

Last updated Jul 14, 2026

VBMFX (Vanguard Total Bond Market Index Fund) and SCOAX (SEI Institutional Investments Trust Core Fixed Income Fund) are both Intermediate Core Bond funds. Over the past 10 years, VBMFX returned 1.28%/yr vs 1.70%/yr for SCOAX. Their correlation of 0.91 suggests significant overlap in exposure. VBMFX charges 0.15%/yr vs 0.36%/yr for SCOAX.

Performance

VBMFX vs. SCOAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Total Bond Market Index Fund (VBMFX) and SEI Institutional Investments Trust Core Fixed Income Fund (SCOAX). 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 VBMFX at -0.03% and SCOAX at -0.03%. Over the past 10 years, VBMFX has underperformed SCOAX with an annualized return of 1.28%, while SCOAX has yielded a comparatively higher 1.70% annualized return.

VBMFX

• 1D: -0.10%
• 1M: -0.30%
• 6M: -0.03%
• YTD: -0.03%
• 1Y: 3.82%
• 3Y*: 4.10%
• 5Y*: -0.26%
• 10Y*: 1.28%

SCOAX

• 1D: -0.11%
• 1M: -0.33%
• 6M: -0.14%
• YTD: -0.03%
• 1Y: 4.08%
• 3Y*: 4.02%
• 5Y*: -0.58%
• 10Y*: 1.70%

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

VBMFX vs. SCOAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VBMFX Vanguard Total Bond Market Index Fund	-0.03%	7.05%	1.15%	5.62%	-13.25%	-2.04%	7.63%	8.61%	-0.34%	3.45%
SCOAX SEI Institutional Investments Trust Core Fixed Income Fund	-0.03%	7.56%	0.82%	5.44%	-14.84%	-1.49%	9.49%	9.59%	0.11%	5.07%

Correlation

The correlation between VBMFX and SCOAX 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	0.95
Correlation (All Time) Calculated using the full available price history since Jan 2, 1997	0.91

The correlation between VBMFX and SCOAX has been stable across timeframes, ranging from 0.91 to 0.97 - a consistent structural relationship.

Return for Risk

VBMFX vs. SCOAX — Risk / Return Rank

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

VBMFX

VBMFX Risk / Return Rank: 18
VBMFX Sharpe Ratio Rank: 18
VBMFX Sortino Ratio Rank: 18
VBMFX Omega Ratio Rank: 16
VBMFX Calmar Ratio Rank: 19
VBMFX Martin Ratio Rank: 17

SCOAX

SCOAX Risk / Return Rank: 20
SCOAX Sharpe Ratio Rank: 20
SCOAX Sortino Ratio Rank: 21
SCOAX Omega Ratio Rank: 19
SCOAX Calmar Ratio Rank: 21
SCOAX Martin Ratio Rank: 18

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.

VBMFX vs. SCOAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Total Bond Market Index Fund (VBMFX) and SEI Institutional Investments Trust Core Fixed Income Fund (SCOAX). 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.

	VBMFX	SCOAX	Difference
Sharpe ratio: Return per unit of total volatility	0.89	0.95	-0.05
Sortino ratio: Return per unit of downside risk	1.32	1.42	-0.10
Omega ratio: Gain probability vs. loss probability	1.16	1.17	-0.01
Calmar ratio: Return relative to maximum drawdown	1.17	1.23	-0.06
Martin ratio: Return relative to average drawdown	3.24	3.35	-0.11

VBMFX vs. SCOAX - Sharpe Ratio Comparison

The current VBMFX Sharpe Ratio is 0.89, which is comparable to the SCOAX Sharpe Ratio of 0.95. The chart below compares the historical Sharpe Ratios of VBMFX and SCOAX, 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

VBMFX vs. SCOAX - Drawdown Comparison

The maximum VBMFX drawdown since its inception was -19.08%, smaller than the maximum SCOAX drawdown of -20.12%. Use the drawdown chart below to compare losses from any high point for VBMFX and SCOAX.

Drawdown Indicators

	VBMFX	SCOAX	Difference
Max Drawdown Largest peak-to-trough decline	-19.08%	-20.12%	+1.04%
Max Drawdown (1Y) Largest decline over 1 year	-2.91%	-3.06%	+0.15%
Max Drawdown (3Y) Largest decline over 3 years	-6.02%	-7.02%	+1.00%
Max Drawdown (5Y) Largest decline over 5 years	-18.24%	-19.90%	+1.66%
Max Drawdown (10Y) Largest decline over 10 years	-19.08%	-20.12%	+1.04%
Current Drawdown Current decline from peak	-3.29%	-4.11%	+0.82%
Average Drawdown Average peak-to-trough decline	-2.70%	-5.45%	+2.75%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.05%	1.12%	-0.07%

Volatility

VBMFX vs. SCOAX - Volatility Comparison

Vanguard Total Bond Market Index Fund (VBMFX) and SEI Institutional Investments Trust Core Fixed Income Fund (SCOAX) have volatilities of 1.14% and 1.14%, 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

	VBMFX	SCOAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.14%	1.14%	0.00%
Volatility (6M) Calculated over the trailing 6-month period	2.93%	3.04%	-0.11%
Volatility (1Y) Calculated over the trailing 1-year period	3.81%	3.97%	-0.16%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.01%	6.37%	-0.36%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.98%	5.23%	-0.25%

VBMFX vs. SCOAX - Expense Ratio Comparison

VBMFX has a 0.15% expense ratio, which is lower than SCOAX's 0.36% expense ratio.

Dividends

VBMFX vs. SCOAX - Dividend Comparison

VBMFX's dividend yield for the trailing twelve months is around 3.91%, less than SCOAX's 4.29% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SCOAX SEI Institutional Investments Trust Core Fixed Income Fund	4.29%	4.19%	3.57%	2.98%	2.11%	1.69%	6.04%	4.24%	3.16%	3.67%	3.79%	4.73%
VBMFX Vanguard Total Bond Market Index Fund	3.91%	3.76%	3.57%	2.99%	2.49%	1.72%	2.31%	2.63%	2.47%	2.45%	2.43%	2.71%

Frequently Asked Questions

Can I hold both VBMFX and SCOAX in my portfolio?

With a correlation of 0.95, VBMFX and SCOAX 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, VBMFX or SCOAX?

SCOAX has higher volatility (1.14%) compared to VBMFX (1.14%). In terms of maximum drawdown, VBMFX dropped -19.08% vs SCOAX's -20.12%.

Which has better risk-adjusted returns?

SCOAX currently has the higher Sharpe Ratio (0.95 vs 0.89), 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.