CYDY vs. SPY

Last updated Apr 2, 2026

Compare and contrast key facts about CytoDyn Inc. (CYDY) and State Street SPDR S&P 500 ETF (SPY).

SPY is a passively managed fund by State Street that tracks the performance of the S&P 500 Index. It was launched on Jan 22, 1993.

Performance

CYDY vs. SPY - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in CytoDyn Inc. (CYDY) and State Street SPDR S&P 500 ETF (SPY). The values are adjusted to include any dividend payments, if applicable.

CYDY vs. SPY - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CYDY CytoDyn Inc.	-7.13%	155.24%	-43.74%	-13.33%	-77.27%	-81.63%	439.00%	112.77%	-14.55%	-17.93%
SPY State Street SPDR S&P 500 ETF	-3.65%	17.72%	24.89%	26.18%	-18.18%	28.73%	18.33%	31.22%	-4.57%	21.71%

Returns By Period

In the year-to-date period, CYDY achieves a -7.13% return, which is significantly lower than SPY's -3.65% return. Over the past 10 years, CYDY has underperformed SPY with an annualized return of -11.92%, while SPY has yielded a comparatively higher 14.06% annualized return.

CYDY

• 1D: -5.10%
• 1M: 5.67%
• YTD: -7.13%
• 6M: 0.10%
• 1Y: 5.53%
• 3Y*: -10.28%
• 5Y*: -39.43%
• 10Y*: -11.92%

SPY

• 1D: 0.75%
• 1M: -4.28%
• YTD: -3.65%
• 6M: -1.42%
• 1Y: 18.14%
• 3Y*: 18.48%
• 5Y*: 11.86%
• 10Y*: 14.06%

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

Return for Risk

CYDY vs. SPY — Risk / Return Rank

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

CYDY

CYDY Risk / Return Rank: 45
CYDY Sharpe Ratio Rank: 43
CYDY Sortino Ratio Rank: 48
CYDY Omega Ratio Rank: 45
CYDY Calmar Ratio Rank: 46
CYDY Martin Ratio Rank: 45

SPY

SPY Risk / Return Rank: 59
SPY Sharpe Ratio Rank: 51
SPY Sortino Ratio Rank: 56
SPY Omega Ratio Rank: 60
SPY Calmar Ratio Rank: 58
SPY Martin Ratio Rank: 69

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.

CYDY vs. SPY - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for CytoDyn Inc. (CYDY) and State Street SPDR S&P 500 ETF (SPY). 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.

	CYDY	SPY	Difference
Sharpe ratio Return per unit of total volatility	0.07	0.96	-0.89
Sortino ratio Return per unit of downside risk	0.75	1.49	-0.74
Omega ratio Gain probability vs. loss probability	1.08	1.23	-0.15
Calmar ratio Return relative to maximum drawdown	0.28	1.53	-1.25
Martin ratio Return relative to average drawdown	0.41	7.27	-6.86
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CYDY vs. SPY - Sharpe Ratio Comparison

The current CYDY Sharpe Ratio is 0.07, which is lower than the SPY Sharpe Ratio of 0.96. The chart below compares the historical Sharpe Ratios of CYDY and SPY, 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

	CYDY	SPY	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.07	0.96	-0.89
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.37	0.70	-1.07
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.11	0.79	-0.90
Sharpe Ratio (All Time) Calculated using the full available price history	-0.04	0.56	-0.60

Correlation

The correlation between CYDY and SPY is 0.05, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

CYDY vs. SPY - Dividend Comparison

CYDY has not paid dividends to shareholders, while SPY's dividend yield for the trailing twelve months is around 1.13%.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CYDY CytoDyn Inc.	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
SPY State Street SPDR S&P 500 ETF	1.13%	1.07%	1.21%	1.40%	1.65%	1.20%	1.52%	1.75%	2.04%	1.80%	2.03%	2.06%

Drawdowns

CYDY vs. SPY - Drawdown Comparison

The maximum CYDY drawdown since its inception was -98.76%, which is greater than SPY's maximum drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for CYDY and SPY.

Drawdown Indicators

	CYDY	SPY	Difference
Max Drawdown Largest peak-to-trough decline	-98.76%	-55.19%	-43.57%
Max Drawdown (1Y) Largest decline over 1 year	-46.80%	-12.05%	-34.75%
Max Drawdown (5Y) Largest decline over 5 years	-97.26%	-24.50%	-72.76%
Max Drawdown (10Y) Largest decline over 10 years	-98.76%	-33.72%	-65.04%
Current Drawdown Current decline from peak	-97.04%	-5.53%	-91.51%
Average Drawdown Average peak-to-trough decline	-70.53%	-9.09%	-61.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	32.11%	2.54%	+29.57%

Volatility

CYDY vs. SPY - Volatility Comparison

CytoDyn Inc. (CYDY) has a higher volatility of 21.89% compared to State Street SPDR S&P 500 ETF (SPY) at 5.35%. This indicates that CYDY's price experiences larger fluctuations and is considered to be riskier than SPY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CYDY	SPY	Difference
Volatility (1M) Calculated over the trailing 1-month period	21.89%	5.35%	+16.54%
Volatility (6M) Calculated over the trailing 6-month period	45.93%	9.50%	+36.43%
Volatility (1Y) Calculated over the trailing 1-year period	80.01%	19.06%	+60.95%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	107.54%	17.06%	+90.48%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	105.79%	17.92%	+87.87%