POMIX vs. VSMPX

Last updated Jun 25, 2026

POMIX (T. Rowe Price Total Equity Market Index Fund) and VSMPX (Vanguard Total Stock Market Index Fund Institutional Plus Shares) are both Large Cap Blend Equities funds. Over the past 10 years, POMIX returned 14.78%/yr vs 15.15%/yr for VSMPX. With a 0.99 correlation, they move nearly in lockstep. POMIX charges 0.20%/yr vs 0.02%/yr for VSMPX.

Performance

POMIX vs. VSMPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price Total Equity Market Index Fund (POMIX) and Vanguard Total Stock Market Index Fund Institutional Plus Shares (VSMPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with POMIX having a 9.01% return and VSMPX slightly lower at 8.86%. Both investments have delivered pretty close results over the past 10 years, with POMIX having a 14.78% annualized return and VSMPX not far ahead at 15.15%.

POMIX

• 1D: -1.37%
• 1M: -0.67%
• YTD: 9.01%
• 6M: 7.60%
• 1Y: 23.06%
• 3Y*: 20.65%
• 5Y*: 11.92%
• 10Y*: 14.78%

VSMPX

• 1D: -1.35%
• 1M: -0.80%
• YTD: 8.86%
• 6M: 7.40%
• 1Y: 22.85%
• 3Y*: 20.65%
• 5Y*: 11.93%
• 10Y*: 15.15%

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

POMIX vs. VSMPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
POMIX T. Rowe Price Total Equity Market Index Fund	9.01%	17.09%	23.48%	26.38%	-19.64%	25.39%	19.82%	30.95%	-5.57%	19.09%
VSMPX Vanguard Total Stock Market Index Fund Institutional Plus Shares	8.86%	17.15%	23.26%	26.53%	-19.50%	25.74%	21.01%	30.79%	-5.16%	21.19%

Correlation

The correlation between POMIX and VSMPX is 0.96 - 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	0.96
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.98
Correlation (10Y) Calculated over the trailing 10-year period	0.99
Correlation (All Time) Calculated using the full available price history since Jan 4, 2016	0.99

The correlation between POMIX and VSMPX has been stable across timeframes, ranging from 0.96 to 0.99 - a consistent structural relationship.

Return for Risk

POMIX vs. VSMPX — Risk / Return Rank

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

POMIX

POMIX Risk / Return Rank: 58
POMIX Sharpe Ratio Rank: 54
POMIX Sortino Ratio Rank: 52
POMIX Omega Ratio Rank: 51
POMIX Calmar Ratio Rank: 63
POMIX Martin Ratio Rank: 73

VSMPX

VSMPX Risk / Return Rank: 52
VSMPX Sharpe Ratio Rank: 49
VSMPX Sortino Ratio Rank: 45
VSMPX Omega Ratio Rank: 46
VSMPX Calmar Ratio Rank: 56
VSMPX Martin Ratio Rank: 67

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.

POMIX vs. VSMPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price Total Equity Market Index Fund (POMIX) and Vanguard Total Stock Market Index Fund Institutional Plus Shares (VSMPX). 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.

	POMIX	VSMPX	Difference
Sharpe ratio: Return per unit of total volatility	1.99	1.89	+0.09
Sortino ratio: Return per unit of downside risk	2.77	2.59	+0.18
Omega ratio: Gain probability vs. loss probability	1.36	1.34	+0.02
Calmar ratio: Return relative to maximum drawdown	2.87	2.73	+0.14
Martin ratio: Return relative to average drawdown	12.84	12.18	+0.65

POMIX vs. VSMPX - Sharpe Ratio Comparison

The current POMIX Sharpe Ratio is 1.99, which is comparable to the VSMPX Sharpe Ratio of 1.89. The chart below compares the historical Sharpe Ratios of POMIX and VSMPX, 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

POMIX vs. VSMPX - Drawdown Comparison

The maximum POMIX drawdown since its inception was -55.54%, which is greater than VSMPX's maximum drawdown of -34.97%. Use the drawdown chart below to compare losses from any high point for POMIX and VSMPX.

Drawdown Indicators

	POMIX	VSMPX	Difference
Max Drawdown Largest peak-to-trough decline	-55.54%	-34.97%	-20.57%
Max Drawdown (1Y) Largest decline over 1 year	-8.83%	-8.92%	+0.09%
Max Drawdown (3Y) Largest decline over 3 years	-19.67%	-19.36%	-0.31%
Max Drawdown (5Y) Largest decline over 5 years	-25.56%	-25.35%	-0.21%
Max Drawdown (10Y) Largest decline over 10 years	-35.05%	-34.97%	-0.08%
Current Drawdown Current decline from peak	-2.67%	-2.79%	+0.12%
Average Drawdown Average peak-to-trough decline	-10.63%	-4.58%	-6.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.95%	2.00%	-0.05%

Volatility

POMIX vs. VSMPX - Volatility Comparison

T. Rowe Price Total Equity Market Index Fund (POMIX) and Vanguard Total Stock Market Index Fund Institutional Plus Shares (VSMPX) have volatilities of 4.97% and 4.97%, 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

	POMIX	VSMPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.97%	4.97%	0.00%
Volatility (6M) Calculated over the trailing 6-month period	10.41%	10.12%	+0.29%
Volatility (1Y) Calculated over the trailing 1-year period	12.80%	12.89%	-0.09%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.65%	17.46%	+0.19%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.53%	18.43%	+0.10%

POMIX vs. VSMPX - Expense Ratio Comparison

POMIX has a 0.20% expense ratio, which is higher than VSMPX's 0.02% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

POMIX vs. VSMPX - Dividend Comparison

POMIX's dividend yield for the trailing twelve months is around 1.95%, more than VSMPX's 1.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
POMIX T. Rowe Price Total Equity Market Index Fund	1.95%	2.13%	1.76%	1.46%	1.49%	1.53%	1.55%	1.91%	2.89%	0.20%	2.41%	2.08%
VSMPX Vanguard Total Stock Market Index Fund Institutional Plus Shares	1.04%	1.13%	1.27%	1.43%	1.67%	1.22%	1.43%	1.78%	2.05%	1.73%	1.95%	0.00%

Frequently Asked Questions

Can I hold both POMIX and VSMPX in my portfolio?

With a correlation of 0.96, POMIX and VSMPX 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, POMIX or VSMPX?

VSMPX has higher volatility (4.97%) compared to POMIX (4.97%). In terms of maximum drawdown, POMIX dropped -55.54% vs VSMPX's -34.97%.

Which has better risk-adjusted returns?

POMIX currently has the higher Sharpe Ratio (1.99 vs 1.89), 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.