IAXIX vs. FMDGX

Last updated Jun 4, 2026

IAXIX (VY T. Rowe Price Diversified Mid Cap Growth Portfolio) and FMDGX (Fidelity Mid Cap Growth Index Fund) are both Mid Cap Growth Equities funds. Over the past 5 years, IAXIX returned 8.22%/yr vs 7.23%/yr for FMDGX. With a 0.95 correlation, they move nearly in lockstep. IAXIX charges 0.78%/yr vs 0.05%/yr for FMDGX.

Performance

IAXIX vs. FMDGX - Performance Comparison

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

Returns By Period

In the year-to-date period, IAXIX achieves a 5.28% return, which is significantly higher than FMDGX's 4.88% return.

IAXIX

• 1D: 0.09%
• 1M: 4.23%
• YTD: 5.28%
• 6M: 4.05%
• 1Y: 8.52%
• 3Y*: 16.42%
• 5Y*: 8.22%
• 10Y*: 13.09%

FMDGX

• 1D: -0.22%
• 1M: 5.21%
• YTD: 4.88%
• 6M: 3.96%
• 1Y: 6.81%
• 3Y*: 16.42%
• 5Y*: 7.23%
• 10Y*: —

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

IAXIX vs. FMDGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
IAXIX VY T. Rowe Price Diversified Mid Cap Growth Portfolio	5.28%	10.02%	23.56%	20.96%	-24.03%	13.90%	31.84%	5.18%
FMDGX Fidelity Mid Cap Growth Index Fund	4.88%	8.60%	22.03%	25.79%	-26.67%	12.67%	34.84%	4.63%

Correlation

The correlation between IAXIX and FMDGX is 0.88, 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	0.88
Correlation (3Y) Calculated over the trailing 3-year period	0.89
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (All Time) Calculated using the full available price history since Jul 18, 2019	0.95

The correlation between IAXIX and FMDGX has been stable across timeframes, ranging from 0.88 to 0.95 - a consistent structural relationship.

Return for Risk

IAXIX vs. FMDGX — Risk / Return Rank

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

IAXIX

IAXIX Risk / Return Rank: 8
IAXIX Sharpe Ratio Rank: 8
IAXIX Sortino Ratio Rank: 8
IAXIX Omega Ratio Rank: 7
IAXIX Calmar Ratio Rank: 8
IAXIX Martin Ratio Rank: 8

FMDGX

FMDGX Risk / Return Rank: 6
FMDGX Sharpe Ratio Rank: 6
FMDGX Sortino Ratio Rank: 6
FMDGX Omega Ratio Rank: 6
FMDGX Calmar Ratio Rank: 6
FMDGX Martin Ratio Rank: 6

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.

IAXIX vs. FMDGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for VY T. Rowe Price Diversified Mid Cap Growth Portfolio (IAXIX) 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.

	IAXIX	FMDGX	Difference
Sharpe ratio: Return per unit of total volatility	0.62	0.49	+0.14
Sortino ratio: Return per unit of downside risk	1.00	0.80	+0.20
Omega ratio: Gain probability vs. loss probability	1.11	1.09	+0.02
Calmar ratio: Return relative to maximum drawdown	0.75	0.54	+0.21
Martin ratio: Return relative to average drawdown	2.29	1.58	+0.71
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IAXIX vs. FMDGX - Sharpe Ratio Comparison

The current IAXIX Sharpe Ratio is 0.62, which is comparable to the FMDGX Sharpe Ratio of 0.49. The chart below compares the historical Sharpe Ratios of IAXIX and FMDGX, 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

	IAXIX	FMDGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.62	0.49	+0.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.38	0.32	+0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.62	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	0.45	0.00

Drawdowns

IAXIX vs. FMDGX - Drawdown Comparison

The maximum IAXIX drawdown since its inception was -57.55%, which is greater than FMDGX's maximum drawdown of -38.59%. Use the drawdown chart below to compare losses from any high point for IAXIX and FMDGX.

Drawdown Indicators

	IAXIX	FMDGX	Difference
Max Drawdown Largest peak-to-trough decline	-57.55%	-38.59%	-18.96%
Max Drawdown (1Y) Largest decline over 1 year	-14.20%	-14.75%	+0.55%
Max Drawdown (3Y) Largest decline over 3 years	-25.22%	-25.30%	+0.08%
Max Drawdown (5Y) Largest decline over 5 years	-35.55%	-38.59%	+3.04%
Max Drawdown (10Y) Largest decline over 10 years	-35.92%	—	—
Current Drawdown Current decline from peak	-0.43%	-1.09%	+0.66%
Average Drawdown Average peak-to-trough decline	-9.26%	-11.21%	+1.95%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.42%	5.05%	-0.63%

Volatility

IAXIX vs. FMDGX - Volatility Comparison

VY T. Rowe Price Diversified Mid Cap Growth Portfolio (IAXIX) and Fidelity Mid Cap Growth Index Fund (FMDGX) have volatilities of 3.56% and 3.52%, 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

	IAXIX	FMDGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.56%	3.52%	+0.04%
Volatility (6M) Calculated over the trailing 6-month period	13.03%	12.64%	+0.39%
Volatility (1Y) Calculated over the trailing 1-year period	17.15%	16.46%	+0.69%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.52%	22.37%	+0.15%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.59%	24.32%	-2.73%

IAXIX vs. FMDGX - Expense Ratio Comparison

IAXIX has a 0.78% expense ratio, which is higher than FMDGX's 0.05% expense ratio.

Dividends

IAXIX vs. FMDGX - Dividend Comparison

IAXIX's dividend yield for the trailing twelve months is around 14.08%, more than FMDGX's 1.77% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FMDGX Fidelity Mid Cap Growth Index Fund	1.77%	1.85%	0.47%	0.63%	0.81%	6.43%	0.36%	0.29%	0.00%	0.00%	0.00%	0.00%
IAXIX VY T. Rowe Price Diversified Mid Cap Growth Portfolio	14.08%	14.82%	10.16%	0.13%	33.01%	16.53%	7.02%	10.49%	11.65%	7.56%	13.36%	17.67%

Frequently Asked Questions

Can I hold both IAXIX and FMDGX in my portfolio?

IAXIX and FMDGX have a correlation of 0.88, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IAXIX or FMDGX?

IAXIX has higher volatility (3.56%) compared to FMDGX (3.52%). In terms of maximum drawdown, IAXIX dropped -57.55% vs FMDGX's -38.59%.

Which has better risk-adjusted returns?

IAXIX currently has the higher Sharpe Ratio (0.62 vs 0.49), 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.