LSIIX vs. VBMPX

Last updated Jun 3, 2026

LSIIX (Loomis Sayles Investment Grade Bond Fund Class Y) and VBMPX (Vanguard Total Bond Market Index Fund Institutional Plus Shares) are both Total Bond Market funds. Over the past 10 years, LSIIX returned 3.13%/yr vs 1.58%/yr for VBMPX. A 0.64 correlation means they provide meaningful diversification when combined. LSIIX charges 0.54%/yr vs 0.03%/yr for VBMPX.

Performance

LSIIX vs. VBMPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Loomis Sayles Investment Grade Bond Fund Class Y (LSIIX) and Vanguard Total Bond Market Index Fund Institutional Plus Shares (VBMPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, LSIIX achieves a 0.25% return, which is significantly lower than VBMPX's 0.43% return. Over the past 10 years, LSIIX has outperformed VBMPX with an annualized return of 3.13%, while VBMPX has yielded a comparatively lower 1.58% annualized return.

LSIIX

• 1D: -0.10%
• 1M: 0.22%
• YTD: 0.25%
• 6M: 0.33%
• 1Y: 3.99%
• 3Y*: 4.49%
• 5Y*: 0.90%
• 10Y*: 3.13%

VBMPX

• 1D: -0.10%
• 1M: 0.14%
• YTD: 0.43%
• 6M: 0.46%
• 1Y: 5.36%
• 3Y*: 4.06%
• 5Y*: 0.19%
• 10Y*: 1.58%

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

LSIIX vs. VBMPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
LSIIX Loomis Sayles Investment Grade Bond Fund Class Y	0.25%	5.58%	2.91%	7.50%	-11.31%	0.18%	11.60%	9.04%	-0.31%	6.65%
VBMPX Vanguard Total Bond Market Index Fund Institutional Plus Shares	0.43%	7.18%	1.27%	5.75%	-13.14%	-1.95%	7.75%	8.74%	-0.24%	3.58%

Correlation

The correlation between LSIIX and VBMPX is 0.72, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.72
Correlation (3Y) Calculated over the trailing 3-year period	0.85
Correlation (5Y) Calculated over the trailing 5-year period	0.87
Correlation (10Y) Calculated over the trailing 10-year period	0.78
Correlation (All Time) Calculated using the full available price history since Feb 8, 2010	0.64

The correlation between LSIIX and VBMPX shifts across timeframes, from 0.64 (all time) to 0.87 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

LSIIX vs. VBMPX — Risk / Return Rank

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

LSIIX

LSIIX Risk / Return Rank: 14
LSIIX Sharpe Ratio Rank: 16
LSIIX Sortino Ratio Rank: 16
LSIIX Omega Ratio Rank: 15
LSIIX Calmar Ratio Rank: 13
LSIIX Martin Ratio Rank: 12

VBMPX

VBMPX Risk / Return Rank: 21
VBMPX Sharpe Ratio Rank: 18
VBMPX Sortino Ratio Rank: 19
VBMPX Omega Ratio Rank: 17
VBMPX Calmar Ratio Rank: 26
VBMPX Martin Ratio Rank: 22

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.

LSIIX vs. VBMPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Loomis Sayles Investment Grade Bond Fund Class Y (LSIIX) and Vanguard Total Bond Market Index Fund Institutional Plus Shares (VBMPX). 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.

	LSIIX	VBMPX	Difference
Sharpe ratio Return per unit of total volatility	1.16	1.27	-0.11
Sortino ratio Return per unit of downside risk	1.71	1.91	-0.21
Omega ratio Gain probability vs. loss probability	1.21	1.23	-0.02
Calmar ratio Return relative to maximum drawdown	1.30	1.94	-0.64
Martin ratio Return relative to average drawdown	3.62	5.87	-2.25
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

LSIIX vs. VBMPX - Sharpe Ratio Comparison

The current LSIIX Sharpe Ratio is 1.16, which is comparable to the VBMPX Sharpe Ratio of 1.27. The chart below compares the historical Sharpe Ratios of LSIIX and VBMPX, 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

	LSIIX	VBMPX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.16	1.27	-0.11
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.18	0.03	+0.15
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.71	0.32	+0.39
Sharpe Ratio (All Time) Calculated using the full available price history	1.14	0.52	+0.62

Drawdowns

LSIIX vs. VBMPX - Drawdown Comparison

The maximum LSIIX drawdown since its inception was -20.77%, which is greater than VBMPX's maximum drawdown of -18.90%. Use the drawdown chart below to compare losses from any high point for LSIIX and VBMPX.

Drawdown Indicators

	LSIIX	VBMPX	Difference
Max Drawdown Largest peak-to-trough decline	-20.77%	-18.90%	-1.87%
Max Drawdown (1Y) Largest decline over 1 year	-2.99%	-2.89%	-0.10%
Max Drawdown (3Y) Largest decline over 3 years	-5.45%	-5.99%	+0.54%
Max Drawdown (5Y) Largest decline over 5 years	-15.62%	-18.12%	+2.50%
Max Drawdown (10Y) Largest decline over 10 years	-15.62%	-18.90%	+3.28%
Current Drawdown Current decline from peak	-1.33%	-2.23%	+0.90%
Average Drawdown Average peak-to-trough decline	-2.42%	-3.53%	+1.11%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.16%	0.96%	+0.20%

Volatility

LSIIX vs. VBMPX - Volatility Comparison

Loomis Sayles Investment Grade Bond Fund Class Y (LSIIX) and Vanguard Total Bond Market Index Fund Institutional Plus Shares (VBMPX) have volatilities of 1.34% and 1.38%, 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

	LSIIX	VBMPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.34%	1.38%	-0.04%
Volatility (6M) Calculated over the trailing 6-month period	2.85%	2.80%	+0.05%
Volatility (1Y) Calculated over the trailing 1-year period	4.04%	3.98%	+0.06%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.28%	6.02%	-0.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.52%	4.99%	-0.47%

LSIIX vs. VBMPX - Expense Ratio Comparison

LSIIX has a 0.54% expense ratio, which is higher than VBMPX's 0.03% expense ratio.

Dividends

LSIIX vs. VBMPX - Dividend Comparison

LSIIX's dividend yield for the trailing twelve months is around 3.54%, less than VBMPX's 4.00% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
LSIIX Loomis Sayles Investment Grade Bond Fund Class Y	3.54%	3.68%	4.86%	4.25%	3.32%	4.10%	8.20%	3.56%	2.18%	4.10%	6.71%	3.91%
VBMPX Vanguard Total Bond Market Index Fund Institutional Plus Shares	4.00%	3.88%	3.69%	3.11%	2.61%	1.81%	2.41%	2.75%	2.58%	2.58%	2.55%	2.85%

Frequently Asked Questions

Can I hold both LSIIX and VBMPX in my portfolio?

LSIIX and VBMPX have a correlation of 0.72, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, LSIIX or VBMPX?

VBMPX has higher volatility (1.38%) compared to LSIIX (1.34%). In terms of maximum drawdown, LSIIX dropped -20.77% vs VBMPX's -18.90%.

Which has better risk-adjusted returns?

VBMPX currently has the higher Sharpe Ratio (1.27 vs 1.16), 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.