AMZN vs. ATRA

Last updated Jun 9, 2026

AMZN (Amazon.com, Inc) and ATRA (Atara Biotherapeutics, Inc.) are both stocks. AMZN operates in Internet Retail (Consumer Cyclical), while ATRA operates in Biotechnology (Healthcare). Over the past 10 years, AMZN returned 21.19%/yr vs -32.50%/yr for ATRA. At a 0.24 correlation, their price movements are largely independent.

Performance

AMZN vs. ATRA - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Amazon.com, Inc (AMZN) and Atara Biotherapeutics, Inc. (ATRA). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AMZN achieves a 6.24% return, which is significantly higher than ATRA's -47.04% return. Over the past 10 years, AMZN has outperformed ATRA with an annualized return of 21.19%, while ATRA has yielded a comparatively lower -32.50% annualized return.

AMZN

• 1D: -0.33%
• 1M: -10.07%
• YTD: 6.24%
• 6M: 8.08%
• 1Y: 14.82%
• 3Y*: 25.71%
• 5Y*: 8.37%
• 10Y*: 21.19%

ATRA

• 1D: -3.43%
• 1M: 14.87%
• YTD: -47.04%
• 6M: -36.47%
• 1Y: 3.79%
• 3Y*: -42.16%
• 5Y*: -51.49%
• 10Y*: -32.50%

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

AMZN vs. ATRA - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AMZN Amazon.com, Inc	6.24%	5.21%	44.39%	80.88%	-49.62%	2.38%	76.26%	23.03%	28.43%	55.96%
ATRA Atara Biotherapeutics, Inc.	-47.04%	35.91%	3.82%	-84.37%	-79.19%	-19.71%	19.19%	-52.59%	91.93%	27.46%

Correlation

The correlation between AMZN and ATRA 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	0.16
Correlation (5Y) Calculated over the trailing 5-year period	0.26
Correlation (10Y) Calculated over the trailing 10-year period	0.26
Correlation (All Time) Calculated using the full available price history since Oct 16, 2014	0.24

The correlation between AMZN and ATRA shifts across timeframes, from 0.12 (1 year) to 0.26 (10 years), reflecting how their relationship changes across market environments.

Fundamentals

Market Cap AMZN : $2.67T ATRA : $134.90M
EPS AMZN : $8.37 ATRA : -$0.72
PS Ratio AMZN : 3.58 ATRA : 5.58
Total Revenue (TTM) AMZN : $742.78B ATRA : $22.62M
Gross Profit (TTM) AMZN : $348.59B ATRA : $21.73M
EBITDA (TTM) AMZN : $152.71B ATRA : -$6.92M

Return for Risk

AMZN vs. ATRA — Risk / Return Rank

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

AMZN

AMZN Risk / Return Rank: 56
AMZN Sharpe Ratio Rank: 59
AMZN Sortino Ratio Rank: 53
AMZN Omega Ratio Rank: 51
AMZN Calmar Ratio Rank: 58
AMZN Martin Ratio Rank: 59

ATRA

ATRA Risk / Return Rank: 51
ATRA Sharpe Ratio Rank: 44
ATRA Sortino Ratio Rank: 61
ATRA Omega Ratio Rank: 66
ATRA Calmar Ratio Rank: 43
ATRA Martin Ratio Rank: 43

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.

AMZN vs. ATRA - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Amazon.com, Inc (AMZN) and Atara Biotherapeutics, Inc. (ATRA). 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.

	AMZN	ATRA	Difference
Sharpe ratio: Return per unit of total volatility	0.49	0.03	+0.47
Sortino ratio: Return per unit of downside risk	0.89	1.21	-0.32
Omega ratio: Gain probability vs. loss probability	1.11	1.19	-0.08
Calmar ratio: Return relative to maximum drawdown	0.68	0.05	+0.64
Martin ratio: Return relative to average drawdown	1.64	0.09	+1.55
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AMZN vs. ATRA - Sharpe Ratio Comparison

The current AMZN Sharpe Ratio is 0.49, which is higher than the ATRA Sharpe Ratio of 0.03. The chart below compares the historical Sharpe Ratios of AMZN and ATRA, 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

	AMZN	ATRA	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.49	0.03	+0.47
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.24	-0.42	+0.66
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.65	-0.33	+0.98
Sharpe Ratio (All Time) Calculated using the full available price history	0.56	-0.25	+0.81

Drawdowns

AMZN vs. ATRA - Drawdown Comparison

The maximum AMZN drawdown since its inception was -94.40%, smaller than the maximum ATRA drawdown of -99.74%. Use the drawdown chart below to compare losses from any high point for AMZN and ATRA.

Drawdown Indicators

	AMZN	ATRA	Difference
Max Drawdown Largest peak-to-trough decline	-94.40%	-99.74%	+5.34%
Max Drawdown (1Y) Largest decline over 1 year	-21.74%	-76.89%	+55.15%
Max Drawdown (3Y) Largest decline over 3 years	-30.88%	-92.76%	+61.88%
Max Drawdown (5Y) Largest decline over 5 years	-56.15%	-99.16%	+43.01%
Max Drawdown (10Y) Largest decline over 10 years	-56.15%	-99.68%	+43.53%
Current Drawdown Current decline from peak	-10.83%	-99.40%	+88.57%
Average Drawdown Average peak-to-trough decline	-28.12%	-74.02%	+45.90%
Ulcer Index Depth and duration of drawdowns from previous peaks	9.08%	43.79%	-34.71%

Volatility

AMZN vs. ATRA - Volatility Comparison

The current volatility for Amazon.com, Inc (AMZN) is 7.80%, while Atara Biotherapeutics, Inc. (ATRA) has a volatility of 30.78%. This indicates that AMZN experiences smaller price fluctuations and is considered to be less risky than ATRA based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AMZN	ATRA	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.80%	30.78%	-22.98%
Volatility (6M) Calculated over the trailing 6-month period	20.58%	131.84%	-111.26%
Volatility (1Y) Calculated over the trailing 1-year period	30.13%	144.10%	-113.97%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	35.53%	122.02%	-86.49%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	32.48%	100.21%	-67.73%

Dividends

AMZN vs. ATRA - Dividend Comparison

Neither AMZN nor ATRA has paid dividends to shareholders.

Tickers have no history of dividend payments

Financials

Frequently Asked Questions

Can I hold both AMZN and ATRA in my portfolio?

AMZN and ATRA 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, AMZN or ATRA?

ATRA has higher volatility (30.78%) compared to AMZN (7.80%). In terms of maximum drawdown, AMZN dropped -94.40% vs ATRA's -99.74%.

Which has better risk-adjusted returns?

AMZN currently has the higher Sharpe Ratio (0.49 vs 0.03), 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.