FSLY vs. VOO

Last updated Aug 1, 2026

FSLY (Fastly, Inc.) is a stock, while VOO (Vanguard S&P 500 ETF) is S&P 500 fund tracking the S&P 500 Index. Over the past 5 years, FSLY returned -13.96%/yr vs 12.83%/yr for VOO. Their 0.42 correlation means their historical movements had little consistent relationship.

Performance

FSLY vs. VOO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fastly, Inc. (FSLY) and Vanguard S&P 500 ETF (VOO). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FSLY achieves a 122.59% return, which is significantly higher than VOO's 10.16% return.

FSLY

• 1D: 5.15%
• 1M: 24.99%
• 6M: 144.97%
• YTD: 122.59%
• 1Y: 256.29%
• 3Y*: 8.10%
• 5Y*: -13.96%
• 10Y*: —
• ALL TIME*: 0.73%

VOO

• 1D: 0.71%
• 1M: 0.26%
• 6M: 8.58%
• YTD: 10.16%
• 1Y: 21.58%
• 3Y*: 19.42%
• 5Y*: 12.83%
• 10Y*: 15.14%
• ALL TIME*: 14.78%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
FSLY Fastly, Inc.	$87.80M	$95.93M	$146.72M
VOO Vanguard S&P 500 ETF	$3.82B	$3.78B	$5.44B

FSLY vs. VOO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
FSLY Fastly, Inc.	122.59%	7.84%	-46.97%	117.34%	-76.90%	-59.43%	335.33%	-6.65%
VOO Vanguard S&P 500 ETF	10.16%	17.82%	24.98%	26.32%	-18.17%	28.79%	18.32%	13.62%

Correlation

The correlation between FSLY and VOO is 0.31, which is low. Their historical price movements had little consistent relationship.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.31
Correlation (3Y) Balances recent behavior with more history.	0.42
Correlation (5Y) Shows whether the relationship held over a longer period.	0.50
Correlation (All Time) Calculated using the full available price history since May 17, 2019	0.42

The correlation between FSLY and VOO shifts across timeframes, from 0.31 (1 year) to 0.50 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

FSLY vs. VOO — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

FSLY

FSLY Risk / Return Rank: 92
FSLY Sharpe Ratio Rank: 92
FSLY Sortino Ratio Rank: 92
FSLY Omega Ratio Rank: 93
FSLY Calmar Ratio Rank: 94
FSLY Martin Ratio Rank: 90

VOO

VOO Risk / Return Rank: 68
VOO Sharpe Ratio Rank: 68
VOO Sortino Ratio Rank: 65
VOO Omega Ratio Rank: 66
VOO Calmar Ratio Rank: 64
VOO Martin Ratio Rank: 76

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

FSLY vs. VOO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fastly, Inc. (FSLY) and Vanguard S&P 500 ETF (VOO). 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.

	FSLY	VOO	Difference
Sharpe ratio: Return per unit of total volatility	2.00	1.53	+0.46
Sortino ratio: Return per unit of downside risk	3.01	2.13	+0.88
Omega ratio: Gain probability vs. loss probability	1.42	1.28	+0.14
Calmar ratio: Return relative to maximum drawdown	4.56	2.21	+2.35
Martin ratio: Return relative to average drawdown	9.55	9.44	+0.11

FSLY vs. VOO - Sharpe Ratio Comparison

The current FSLY Sharpe Ratio is 2.00, which is higher than the VOO Sharpe Ratio of 1.53. The chart below compares the historical Sharpe Ratios of FSLY and VOO, 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

FSLY vs. VOO - Drawdown Comparison

The maximum FSLY drawdown since its inception was -96.12%, which is greater than VOO's maximum drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for FSLY and VOO.

Drawdown Indicators

	FSLY	VOO	Difference
Max Drawdown Largest peak-to-trough decline	-96.12%	-33.99%	-62.13%
Max Drawdown (1Y) Largest decline over 1 year	-51.60%	-8.90%	-42.70%
Max Drawdown (3Y) Largest decline over 3 years	-79.99%	-18.69%	-61.30%
Max Drawdown (5Y) Largest decline over 5 years	-90.81%	-24.52%	-66.29%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.99%	—
Current Drawdown Current decline from peak	-82.41%	-1.38%	-81.03%
Average Drawdown Average peak-to-trough decline	-70.44%	-3.67%	-66.77%
Ulcer Index Depth and duration of drawdowns from previous peaks	24.61%	2.08%	+22.53%

Volatility

FSLY vs. VOO - Volatility Comparison

Fastly, Inc. (FSLY) has a higher volatility of 14.59% compared to Vanguard S&P 500 ETF (VOO) at 3.54%. This indicates that FSLY's price experiences larger fluctuations and is considered to be riskier than VOO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FSLY	VOO	Difference
Volatility (1M) Calculated over the trailing 1-month period	14.59%	3.54%	+11.05%
Volatility (6M) Calculated over the trailing 6-month period	98.00%	10.10%	+87.90%
Volatility (1Y) Calculated over the trailing 1-year period	117.88%	12.82%	+105.06%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	87.43%	16.93%	+70.50%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	88.82%	18.01%	+70.81%

Dividends

FSLY vs. VOO - Dividend Comparison

FSLY has not paid dividends to shareholders, while VOO's dividend yield for the trailing twelve months is around 1.07%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSLY Fastly, 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%
VOO Vanguard S&P 500 ETF	1.07%	1.13%	1.24%	1.46%	1.69%	1.25%	1.54%	1.88%	2.06%	1.78%	2.02%	2.10%

Frequently Asked Questions

Can I hold both FSLY and VOO in my portfolio?

FSLY and VOO have a correlation of 0.31, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FSLY or VOO?

FSLY has higher volatility (14.59%) compared to VOO (3.54%). In terms of maximum drawdown, FSLY dropped -96.12% vs VOO's -33.99%.

Which has better risk-adjusted returns?

FSLY currently has the higher Sharpe Ratio (2.00 vs 1.53), 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.