USAC vs. FNILX

Last updated Jun 13, 2026

USAC (USA Compression Partners, LP) is a stock, while FNILX (Fidelity ZERO Large Cap Index Fund) is Large Cap Blend Equities fund managed by Fidelity. Over the past 5 years, USAC returned 22.62%/yr vs 13.10%/yr for FNILX. At a 0.31 correlation, their price movements are largely independent.

Performance

USAC vs. FNILX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in USA Compression Partners, LP (USAC) and Fidelity ZERO Large Cap Index Fund (FNILX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, USAC achieves a 21.00% return, which is significantly higher than FNILX's 8.36% return.

USAC

• 1D: -5.51%
• 1M: -9.42%
• YTD: 21.00%
• 6M: 14.72%
• 1Y: 15.35%
• 3Y*: 20.43%
• 5Y*: 22.62%
• 10Y*: 19.04%

FNILX

• 1D: 1.81%
• 1M: -1.16%
• YTD: 8.36%
• 6M: 8.67%
• 1Y: 24.79%
• 3Y*: 21.29%
• 5Y*: 13.10%
• 10Y*: —

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

USAC vs. FNILX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
USAC USA Compression Partners, LP	21.00%	6.38%	12.67%	28.80%	25.91%	45.90%	-10.09%	57.91%	-18.45%
FNILX Fidelity ZERO Large Cap Index Fund	8.36%	17.81%	25.47%	27.45%	-19.37%	26.67%	21.13%	31.79%	-13.60%

Correlation

The correlation between USAC and FNILX is 0.13, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.13
Correlation (3Y) Calculated over the trailing 3-year period	0.22
Correlation (5Y) Calculated over the trailing 5-year period	0.29
Correlation (All Time) Calculated using the full available price history since Sep 28, 2018	0.31

The correlation between USAC and FNILX shifts across timeframes, from 0.13 (1 year) to 0.31 (all time), reflecting how their relationship changes across market environments.

Return for Risk

USAC vs. FNILX — Risk / Return Rank

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

USAC

USAC Risk / Return Rank: 63
USAC Sharpe Ratio Rank: 63
USAC Sortino Ratio Rank: 56
USAC Omega Ratio Rank: 55
USAC Calmar Ratio Rank: 68
USAC Martin Ratio Rank: 71

FNILX

FNILX Risk / Return Rank: 70
FNILX Sharpe Ratio Rank: 70
FNILX Sortino Ratio Rank: 65
FNILX Omega Ratio Rank: 66
FNILX Calmar Ratio Rank: 71
FNILX Martin Ratio Rank: 81

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.

USAC vs. FNILX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for USA Compression Partners, LP (USAC) and Fidelity ZERO Large Cap Index Fund (FNILX). 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.

	USAC	FNILX	Difference
Sharpe ratio: Return per unit of total volatility	0.60	1.92	-1.33
Sortino ratio: Return per unit of downside risk	1.00	2.60	-1.60
Omega ratio: Gain probability vs. loss probability	1.12	1.35	-0.23
Calmar ratio: Return relative to maximum drawdown	1.29	2.66	-1.37
Martin ratio: Return relative to average drawdown	3.45	11.84	-8.39

USAC vs. FNILX - Sharpe Ratio Comparison

The current USAC Sharpe Ratio is 0.60, which is lower than the FNILX Sharpe Ratio of 1.92. The chart below compares the historical Sharpe Ratios of USAC and FNILX, 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

USAC vs. FNILX - Drawdown Comparison

The maximum USAC drawdown since its inception was -78.96%, which is greater than FNILX's maximum drawdown of -33.76%. Use the drawdown chart below to compare losses from any high point for USAC and FNILX.

Drawdown Indicators

	USAC	FNILX	Difference
Max Drawdown Largest peak-to-trough decline	-78.96%	-33.76%	-45.20%
Max Drawdown (1Y) Largest decline over 1 year	-11.78%	-9.01%	-2.77%
Max Drawdown (3Y) Largest decline over 3 years	-24.35%	-19.08%	-5.27%
Max Drawdown (5Y) Largest decline over 5 years	-24.39%	-25.40%	+1.01%
Max Drawdown (10Y) Largest decline over 10 years	-78.96%	—	—
Current Drawdown Current decline from peak	-11.78%	-2.87%	-8.91%
Average Drawdown Average peak-to-trough decline	-12.70%	-5.36%	-7.34%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.41%	2.02%	+2.39%

Volatility

USAC vs. FNILX - Volatility Comparison

USA Compression Partners, LP (USAC) has a higher volatility of 10.01% compared to Fidelity ZERO Large Cap Index Fund (FNILX) at 4.59%. This indicates that USAC's price experiences larger fluctuations and is considered to be riskier than FNILX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	USAC	FNILX	Difference
Volatility (1M) Calculated over the trailing 1-month period	10.01%	4.59%	+5.42%
Volatility (6M) Calculated over the trailing 6-month period	18.85%	9.76%	+9.09%
Volatility (1Y) Calculated over the trailing 1-year period	25.50%	12.47%	+13.03%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	28.45%	17.32%	+11.13%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	42.80%	20.05%	+22.75%

Dividends

USAC vs. FNILX - Dividend Comparison

USAC's dividend yield for the trailing twelve months is around 7.86%, more than FNILX's 0.93% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FNILX Fidelity ZERO Large Cap Index Fund	0.93%	1.01%	1.09%	1.34%	1.53%	0.95%	1.20%	1.17%	0.53%	0.00%	0.00%	0.00%
USAC USA Compression Partners, LP	7.86%	9.13%	8.91%	9.20%	10.75%	12.03%	15.44%	11.58%	16.18%	12.70%	12.14%	18.06%

Frequently Asked Questions

Can I hold both USAC and FNILX in my portfolio?

USAC and FNILX have a correlation of 0.13, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, USAC or FNILX?

USAC has higher volatility (10.01%) compared to FNILX (4.59%). In terms of maximum drawdown, USAC dropped -78.96% vs FNILX's -33.76%.

Which has better risk-adjusted returns?

FNILX currently has the higher Sharpe Ratio (1.92 vs 0.60), 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.