POMIX vs. SPY

Last updated Jun 5, 2026

POMIX (T. Rowe Price Total Equity Market Index Fund) and SPY (State Street SPDR S&P 500 ETF) are both funds - POMIX is a Large Cap Blend Equities fund managed by T. Rowe Price, while SPY is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, POMIX returned 14.66%/yr vs 15.48%/yr for SPY. With a 0.97 correlation, they move nearly in lockstep. POMIX charges 0.20%/yr vs 0.09%/yr for SPY.

Performance

POMIX vs. SPY - 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 State Street SPDR S&P 500 ETF (SPY). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with POMIX having a 11.19% return and SPY slightly higher at 11.33%. Over the past 10 years, POMIX has underperformed SPY with an annualized return of 14.66%, while SPY has yielded a comparatively higher 15.48% annualized return.

POMIX

• 1D: -0.73%
• 1M: 4.09%
• YTD: 11.19%
• 6M: 10.97%
• 1Y: 28.19%
• 3Y*: 22.01%
• 5Y*: 12.66%
• 10Y*: 14.66%

SPY

• 1D: 0.38%
• 1M: 4.60%
• YTD: 11.33%
• 6M: 11.25%
• 1Y: 28.50%
• 3Y*: 22.58%
• 5Y*: 13.91%
• 10Y*: 15.48%

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

POMIX vs. SPY - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
POMIX T. Rowe Price Total Equity Market Index Fund	11.19%	17.09%	23.48%	26.38%	-19.64%	25.39%	19.82%	30.95%	-5.57%	19.09%
SPY State Street SPDR S&P 500 ETF	11.33%	17.72%	24.89%	26.18%	-18.18%	28.73%	18.33%	31.22%	-4.57%	21.71%

Correlation

The correlation between POMIX and SPY 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	0.95
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 5, 1999	0.97

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

Return for Risk

POMIX vs. SPY — Risk / Return Rank

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

POMIX

POMIX Risk / Return Rank: 70
POMIX Sharpe Ratio Rank: 68
POMIX Sortino Ratio Rank: 66
POMIX Omega Ratio Rank: 61
POMIX Calmar Ratio Rank: 73
POMIX Martin Ratio Rank: 82

SPY

SPY Risk / Return Rank: 74
SPY Sharpe Ratio Rank: 76
SPY Sortino Ratio Rank: 74
SPY Omega Ratio Rank: 75
SPY Calmar Ratio Rank: 66
SPY Martin Ratio Rank: 78

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. SPY - 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 State Street SPDR S&P 500 ETF (SPY). 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.

	POMIX	SPY	Difference
Sharpe ratio: Return per unit of total volatility	2.42	2.42	0.00
Sortino ratio: Return per unit of downside risk	3.40	3.29	+0.11
Omega ratio: Gain probability vs. loss probability	1.43	1.44	0.00
Calmar ratio: Return relative to maximum drawdown	3.31	3.22	+0.09
Martin ratio: Return relative to average drawdown	15.31	14.99	+0.32
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

POMIX vs. SPY - Sharpe Ratio Comparison

The current POMIX Sharpe Ratio is 2.42, which is comparable to the SPY Sharpe Ratio of 2.42. The chart below compares the historical Sharpe Ratios of POMIX and SPY, 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

	POMIX	SPY	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.42	2.42	0.00
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.73	0.82	-0.09
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.80	0.87	-0.07
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	0.59	-0.14

Drawdowns

POMIX vs. SPY - Drawdown Comparison

The maximum POMIX drawdown since its inception was -55.54%, roughly equal to the maximum SPY drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for POMIX and SPY.

Drawdown Indicators

	POMIX	SPY	Difference
Max Drawdown Largest peak-to-trough decline	-55.54%	-55.19%	-0.35%
Max Drawdown (1Y) Largest decline over 1 year	-8.83%	-8.88%	+0.05%
Max Drawdown (3Y) Largest decline over 3 years	-19.67%	-18.76%	-0.91%
Max Drawdown (5Y) Largest decline over 5 years	-25.56%	-24.50%	-1.06%
Max Drawdown (10Y) Largest decline over 10 years	-35.05%	-33.72%	-1.33%
Current Drawdown Current decline from peak	-0.73%	-0.33%	-0.40%
Average Drawdown Average peak-to-trough decline	-10.64%	-9.05%	-1.59%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.88%	1.91%	-0.03%

Volatility

POMIX vs. SPY - Volatility Comparison

T. Rowe Price Total Equity Market Index Fund (POMIX) has a higher volatility of 3.01% compared to State Street SPDR S&P 500 ETF (SPY) at 2.79%. This indicates that POMIX's price experiences larger fluctuations and is considered to be riskier than SPY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	POMIX	SPY	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.01%	2.79%	+0.22%
Volatility (6M) Calculated over the trailing 6-month period	9.58%	8.91%	+0.67%
Volatility (1Y) Calculated over the trailing 1-year period	12.11%	11.82%	+0.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.55%	17.05%	+0.50%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.52%	17.93%	+0.59%

POMIX vs. SPY - Expense Ratio Comparison

POMIX has a 0.20% expense ratio, which is higher than SPY's 0.09% 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. SPY - Dividend Comparison

POMIX's dividend yield for the trailing twelve months is around 1.91%, more than SPY's 0.98% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
POMIX T. Rowe Price Total Equity Market Index Fund	1.91%	2.13%	1.76%	1.46%	1.49%	1.53%	1.55%	1.91%	2.89%	0.20%	2.41%	2.08%
SPY State Street SPDR S&P 500 ETF	0.98%	1.07%	1.21%	1.40%	1.65%	1.20%	1.52%	1.75%	2.04%	1.80%	2.03%	2.06%

Frequently Asked Questions

Can I hold both POMIX and SPY in my portfolio?

With a correlation of 0.95, POMIX and SPY 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 SPY?

POMIX has higher volatility (3.01%) compared to SPY (2.79%). In terms of maximum drawdown, POMIX dropped -55.54% vs SPY's -55.19%.

Which has better risk-adjusted returns?

SPY currently has the higher Sharpe Ratio (2.42 vs 2.42), 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.