TSNIX vs. PREIX

Last updated Jun 4, 2026

TSNIX (T. Rowe Price Science & Technology Fund I Class) and PREIX (T. Rowe Price Equity Index 500 Fund) are both mutual funds - TSNIX is a Technology Equities fund actively managed by T. Rowe Price, while PREIX is a Large Cap Blend Equities fund managed by T. Rowe Price. Over the past 10 years, TSNIX returned 23.81%/yr vs 15.42%/yr for PREIX. Their correlation of 0.84 suggests significant overlap in exposure. TSNIX charges 0.67%/yr vs 0.15%/yr for PREIX.

Performance

TSNIX vs. PREIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price Science & Technology Fund I Class (TSNIX) and T. Rowe Price Equity Index 500 Fund (PREIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TSNIX achieves a 41.46% return, which is significantly higher than PREIX's 11.61% return. Over the past 10 years, TSNIX has outperformed PREIX with an annualized return of 23.81%, while PREIX has yielded a comparatively lower 15.42% annualized return.

TSNIX

• 1D: 2.32%
• 1M: 21.77%
• YTD: 41.46%
• 6M: 38.63%
• 1Y: 84.08%
• 3Y*: 40.47%
• 5Y*: 18.82%
• 10Y*: 23.81%

PREIX

• 1D: 0.13%
• 1M: 5.78%
• YTD: 11.61%
• 6M: 11.63%
• 1Y: 28.74%
• 3Y*: 22.53%
• 5Y*: 14.08%
• 10Y*: 15.42%

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

TSNIX vs. PREIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TSNIX T. Rowe Price Science & Technology Fund I Class	41.46%	24.45%	40.65%	53.94%	-35.29%	5.72%	46.10%	55.54%	-7.41%	39.56%
PREIX T. Rowe Price Equity Index 500 Fund	11.61%	17.66%	24.78%	26.07%	-18.27%	28.48%	18.17%	31.47%	-4.59%	21.01%

Correlation

The correlation between TSNIX and PREIX is 0.79, 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	0.79
Correlation (3Y) Calculated over the trailing 3-year period	0.85
Correlation (5Y) Calculated over the trailing 5-year period	0.84
Correlation (10Y) Calculated over the trailing 10-year period	0.84
Correlation (All Time) Calculated using the full available price history since Mar 28, 2016	0.84

The correlation between TSNIX and PREIX has been stable across timeframes, ranging from 0.79 to 0.85 - a consistent structural relationship.

Return for Risk

TSNIX vs. PREIX — Risk / Return Rank

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

TSNIX

TSNIX Risk / Return Rank: 91
TSNIX Sharpe Ratio Rank: 98
TSNIX Sortino Ratio Rank: 90
TSNIX Omega Ratio Rank: 86
TSNIX Calmar Ratio Rank: 92
TSNIX Martin Ratio Rank: 91

PREIX

PREIX Risk / Return Rank: 72
PREIX Sharpe Ratio Rank: 74
PREIX Sortino Ratio Rank: 66
PREIX Omega Ratio Rank: 66
PREIX Calmar Ratio Rank: 73
PREIX Martin Ratio Rank: 82

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.

TSNIX vs. PREIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price Science & Technology Fund I Class (TSNIX) and T. Rowe Price Equity Index 500 Fund (PREIX). 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.

	TSNIX	PREIX	Difference
Sharpe ratio: Return per unit of total volatility	3.81	2.50	+1.32
Sortino ratio: Return per unit of downside risk	4.41	3.40	+1.02
Omega ratio: Gain probability vs. loss probability	1.59	1.45	+0.13
Calmar ratio: Return relative to maximum drawdown	5.06	3.32	+1.74
Martin ratio: Return relative to average drawdown	18.86	15.47	+3.39
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TSNIX vs. PREIX - Sharpe Ratio Comparison

The current TSNIX Sharpe Ratio is 3.81, which is higher than the PREIX Sharpe Ratio of 2.50. The chart below compares the historical Sharpe Ratios of TSNIX and PREIX, 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

	TSNIX	PREIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.81	2.50	+1.32
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.68	0.83	-0.15
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.97	0.85	+0.11
Sharpe Ratio (All Time) Calculated using the full available price history	0.98	0.61	+0.37

Drawdowns

TSNIX vs. PREIX - Drawdown Comparison

The maximum TSNIX drawdown since its inception was -46.22%, smaller than the maximum PREIX drawdown of -55.32%. Use the drawdown chart below to compare losses from any high point for TSNIX and PREIX.

Drawdown Indicators

	TSNIX	PREIX	Difference
Max Drawdown Largest peak-to-trough decline	-46.22%	-55.32%	+9.10%
Max Drawdown (1Y) Largest decline over 1 year	-17.97%	-8.93%	-9.04%
Max Drawdown (3Y) Largest decline over 3 years	-31.04%	-18.78%	-12.26%
Max Drawdown (5Y) Largest decline over 5 years	-46.22%	-24.60%	-21.62%
Max Drawdown (10Y) Largest decline over 10 years	-46.22%	-33.81%	-12.41%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-8.71%	-8.73%	+0.02%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.74%	1.91%	+2.83%

Volatility

TSNIX vs. PREIX - Volatility Comparison

T. Rowe Price Science & Technology Fund I Class (TSNIX) has a higher volatility of 9.42% compared to T. Rowe Price Equity Index 500 Fund (PREIX) at 2.83%. This indicates that TSNIX's price experiences larger fluctuations and is considered to be riskier than PREIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TSNIX	PREIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	9.42%	2.83%	+6.59%
Volatility (6M) Calculated over the trailing 6-month period	19.92%	8.98%	+10.94%
Volatility (1Y) Calculated over the trailing 1-year period	23.86%	11.87%	+11.99%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	27.84%	17.00%	+10.84%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	24.85%	18.11%	+6.74%

TSNIX vs. PREIX - Expense Ratio Comparison

TSNIX has a 0.67% expense ratio, which is higher than PREIX's 0.15% expense ratio.

Dividends

TSNIX vs. PREIX - Dividend Comparison

TSNIX's dividend yield for the trailing twelve months is around 8.24%, more than PREIX's 2.10% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PREIX T. Rowe Price Equity Index 500 Fund	2.10%	2.32%	1.17%	1.32%	1.50%	1.56%	1.97%	2.13%	2.60%	1.30%	2.03%	2.02%
TSNIX T. Rowe Price Science & Technology Fund I Class	8.24%	11.66%	9.62%	0.00%	7.82%	33.71%	14.00%	11.91%	36.28%	13.35%	3.82%	0.00%

Frequently Asked Questions

Can I hold both TSNIX and PREIX in my portfolio?

TSNIX and PREIX have a correlation of 0.79, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TSNIX or PREIX?

TSNIX has higher volatility (9.42%) compared to PREIX (2.83%). In terms of maximum drawdown, TSNIX dropped -46.22% vs PREIX's -55.32%.

Which has better risk-adjusted returns?

TSNIX currently has the higher Sharpe Ratio (3.81 vs 2.50), 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.