NBST vs. FIDEX

Last updated Jun 4, 2026

NBST (Newbury Street Acquisition Corporation) is a stock, while FIDEX (Fidelity SAI Sustainable U.S. Equity Fund) is Large Cap Blend Equities fund actively managed by Fidelity. Over the past 3 years, NBST returned 2.22%/yr vs 20.73%/yr for FIDEX. At a correlation of -0.01, they often move in opposite directions.

Performance

NBST vs. FIDEX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Newbury Street Acquisition Corporation (NBST) and Fidelity SAI Sustainable U.S. Equity Fund (FIDEX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NBST achieves a -45.00% return, which is significantly lower than FIDEX's 13.32% return.

NBST

• 1D: 0.00%
• 1M: 0.00%
• YTD: -45.00%
• 6M: -45.00%
• 1Y: -11.93%
• 3Y*: 2.22%
• 5Y*: 2.70%
• 10Y*: —

FIDEX

• 1D: 0.24%
• 1M: 5.50%
• YTD: 13.32%
• 6M: 13.66%
• 1Y: 32.85%
• 3Y*: 20.73%
• 5Y*: —
• 10Y*: —

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

NBST vs. FIDEX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
NBST Newbury Street Acquisition Corporation	-45.00%	72.56%	8.93%	6.29%	2.35%
FIDEX Fidelity SAI Sustainable U.S. Equity Fund	13.32%	15.80%	21.44%	24.99%	-8.88%

Correlation

The correlation between NBST and FIDEX is 0.12, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.12
Correlation (3Y) Calculated over the trailing 3-year period	-0.00
Correlation (All Time) Calculated using the full available price history since Apr 26, 2022	-0.01

The correlation between NBST and FIDEX shifts across timeframes, from -0.01 (all time) to 0.12 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

NBST vs. FIDEX — Risk / Return Rank

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

NBST

NBST Risk / Return Rank: 51
NBST Sharpe Ratio Rank: 37
NBST Sortino Ratio Rank: 55
NBST Omega Ratio Rank: 96
NBST Calmar Ratio Rank: 33
NBST Martin Ratio Rank: 33

FIDEX

FIDEX Risk / Return Rank: 71
FIDEX Sharpe Ratio Rank: 71
FIDEX Sortino Ratio Rank: 65
FIDEX Omega Ratio Rank: 61
FIDEX Calmar Ratio Rank: 73
FIDEX Martin Ratio Rank: 85

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.

NBST vs. FIDEX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Newbury Street Acquisition Corporation (NBST) and Fidelity SAI Sustainable U.S. Equity Fund (FIDEX). 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.

	NBST	FIDEX	Difference
Sharpe ratio Return per unit of total volatility	-0.08	2.45	-2.54
Sortino ratio Return per unit of downside risk	1.04	3.35	-2.31
Omega ratio Gain probability vs. loss probability	1.61	1.43	+0.18
Calmar ratio Return relative to maximum drawdown	-0.24	3.35	-3.59
Martin ratio Return relative to average drawdown	-0.44	16.10	-16.53
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

NBST vs. FIDEX - Sharpe Ratio Comparison

The current NBST Sharpe Ratio is -0.08, which is lower than the FIDEX Sharpe Ratio of 2.45. The chart below compares the historical Sharpe Ratios of NBST and FIDEX, 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

	NBST	FIDEX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-0.08	2.45	-2.54
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.04	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.03	0.85	-0.82

Drawdowns

NBST vs. FIDEX - Drawdown Comparison

The maximum NBST drawdown since its inception was -49.90%, which is greater than FIDEX's maximum drawdown of -21.90%. Use the drawdown chart below to compare losses from any high point for NBST and FIDEX.

Drawdown Indicators

	NBST	FIDEX	Difference
Max Drawdown Largest peak-to-trough decline	-49.90%	-21.90%	-28.00%
Max Drawdown (1Y) Largest decline over 1 year	-49.90%	-10.13%	-39.77%
Max Drawdown (3Y) Largest decline over 3 years	-49.90%	-21.90%	-28.00%
Max Drawdown (5Y) Largest decline over 5 years	-49.90%	—	—
Current Drawdown Current decline from peak	-45.00%	0.00%	-45.00%
Average Drawdown Average peak-to-trough decline	-5.06%	-3.70%	-1.36%
Ulcer Index Depth and duration of drawdowns from previous peaks	27.43%	2.11%	+25.32%

Volatility

NBST vs. FIDEX - Volatility Comparison

The current volatility for Newbury Street Acquisition Corporation (NBST) is 0.00%, while Fidelity SAI Sustainable U.S. Equity Fund (FIDEX) has a volatility of 3.92%. This indicates that NBST experiences smaller price fluctuations and is considered to be less risky than FIDEX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NBST	FIDEX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.00%	3.92%	-3.92%
Volatility (6M) Calculated over the trailing 6-month period	79.88%	10.82%	+69.06%
Volatility (1Y) Calculated over the trailing 1-year period	142.60%	13.89%	+128.71%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	64.25%	18.48%	+45.77%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	63.67%	18.48%	+45.19%

Dividends

NBST vs. FIDEX - Dividend Comparison

NBST has not paid dividends to shareholders, while FIDEX's dividend yield for the trailing twelve months is around 1.38%.

Position	TTM	2025	2024	2023	2022
FIDEX Fidelity SAI Sustainable U.S. Equity Fund	1.38%	1.64%	1.87%	0.46%	0.63%
NBST Newbury Street Acquisition Corporation	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both NBST and FIDEX in my portfolio?

NBST and FIDEX have a correlation of 0.12, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, NBST or FIDEX?

FIDEX has higher volatility (3.92%) compared to NBST (0.00%). In terms of maximum drawdown, NBST dropped -49.90% vs FIDEX's -21.90%.

Which has better risk-adjusted returns?

FIDEX currently has the higher Sharpe Ratio (2.45 vs -0.08), 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.