TRMSX vs. FMDGX

Last updated Apr 2, 2026

Compare and contrast key facts about T. Rowe Price Mid-Cap Index Fund (TRMSX) and Fidelity Mid Cap Growth Index Fund (FMDGX).

TRMSX is managed by T. Rowe Price. It was launched on Dec 8, 2015. FMDGX is managed by Fidelity. It was launched on Jul 11, 2019.

Performance

TRMSX vs. FMDGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price Mid-Cap Index Fund (TRMSX) and Fidelity Mid Cap Growth Index Fund (FMDGX). The values are adjusted to include any dividend payments, if applicable.

TRMSX vs. FMDGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
TRMSX T. Rowe Price Mid-Cap Index Fund	-2.45%	12.61%	19.98%	29.90%	-28.56%	7.68%
FMDGX Fidelity Mid Cap Growth Index Fund	-6.36%	8.60%	22.03%	25.79%	-26.67%	15.30%

Returns By Period

In the year-to-date period, TRMSX achieves a -2.45% return, which is significantly higher than FMDGX's -6.36% return.

TRMSX

• 1D: 3.41%
• 1M: -5.44%
• YTD: -2.45%
• 6M: -3.15%
• 1Y: 18.13%
• 3Y*: 16.63%
• 5Y*: —
• 10Y*: —

FMDGX

• 1D: 3.60%
• 1M: -6.39%
• YTD: -6.36%
• 6M: -9.60%
• 1Y: 8.49%
• 3Y*: 12.67%
• 5Y*: 4.92%
• 10Y*: —

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

TRMSX vs. FMDGX - Expense Ratio Comparison

TRMSX has a 0.14% expense ratio, which is higher than FMDGX's 0.05% 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%.

TRMSX

T. Rowe Price Mid-Cap Index Fund

FMDGX

Fidelity Mid Cap Growth Index Fund

Return for Risk

TRMSX vs. FMDGX — Risk / Return Rank

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

TRMSX

TRMSX Risk / Return Rank: 24
TRMSX Sharpe Ratio Rank: 34
TRMSX Sortino Ratio Rank: 39
TRMSX Omega Ratio Rank: 37
TRMSX Calmar Ratio Rank: 5
TRMSX Martin Ratio Rank: 5

FMDGX

FMDGX Risk / Return Rank: 16
FMDGX Sharpe Ratio Rank: 14
FMDGX Sortino Ratio Rank: 16
FMDGX Omega Ratio Rank: 14
FMDGX Calmar Ratio Rank: 20
FMDGX 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.

TRMSX vs. FMDGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price Mid-Cap Index Fund (TRMSX) and Fidelity Mid Cap Growth Index Fund (FMDGX). 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.

	TRMSX	FMDGX	Difference
Sharpe ratio Return per unit of total volatility	0.88	0.41	+0.47
Sortino ratio Return per unit of downside risk	1.41	0.76	+0.65
Omega ratio Gain probability vs. loss probability	1.20	1.10	+0.10
Calmar ratio Return relative to maximum drawdown	0.09	0.63	-0.54
Martin ratio Return relative to average drawdown	0.32	1.97	-1.65
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TRMSX vs. FMDGX - Sharpe Ratio Comparison

The current TRMSX Sharpe Ratio is 0.88, which is higher than the FMDGX Sharpe Ratio of 0.41. The chart below compares the historical Sharpe Ratios of TRMSX and FMDGX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	TRMSX	FMDGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.88	0.41	+0.47
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.22	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.26	0.38	-0.12

Correlation

The correlation between TRMSX and FMDGX is 0.92, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

TRMSX vs. FMDGX - Dividend Comparison

TRMSX's dividend yield for the trailing twelve months is around 6.65%, more than FMDGX's 1.98% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019
TRMSX T. Rowe Price Mid-Cap Index Fund	6.65%	6.49%	1.98%	0.86%	1.92%	4.01%	0.00%	0.00%
FMDGX Fidelity Mid Cap Growth Index Fund	1.98%	1.85%	0.47%	0.63%	0.81%	6.43%	0.36%	0.29%

Drawdowns

TRMSX vs. FMDGX - Drawdown Comparison

The maximum TRMSX drawdown since its inception was -37.34%, roughly equal to the maximum FMDGX drawdown of -38.59%. Use the drawdown chart below to compare losses from any high point for TRMSX and FMDGX.

Drawdown Indicators

	TRMSX	FMDGX	Difference
Max Drawdown Largest peak-to-trough decline	-37.34%	-38.59%	+1.25%
Max Drawdown (1Y) Largest decline over 1 year	-14.85%	-14.75%	-0.10%
Max Drawdown (5Y) Largest decline over 5 years	—	-38.59%	—
Current Drawdown Current decline from peak	-6.43%	-11.68%	+5.25%
Average Drawdown Average peak-to-trough decline	-14.34%	-11.34%	-3.00%
Ulcer Index Depth and duration of drawdowns from previous peaks	7.31%	4.70%	+2.61%

Volatility

TRMSX vs. FMDGX - Volatility Comparison

T. Rowe Price Mid-Cap Index Fund (TRMSX) and Fidelity Mid Cap Growth Index Fund (FMDGX) have volatilities of 6.71% and 6.94%, 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

	TRMSX	FMDGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.71%	6.94%	-0.23%
Volatility (6M) Calculated over the trailing 6-month period	13.35%	13.16%	+0.19%
Volatility (1Y) Calculated over the trailing 1-year period	25.34%	23.17%	+2.17%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.16%	22.41%	+0.75%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.16%	24.50%	-1.34%