ATRA vs. AMZN

Last updated Jun 25, 2026

ATRA (Atara Biotherapeutics, Inc.) and AMZN (Amazon.com, Inc) are both stocks. ATRA operates in Biotechnology (Healthcare), while AMZN operates in Internet Retail (Consumer Cyclical). Over the past 10 years, ATRA returned -32.50%/yr vs 20.96%/yr for AMZN. At a 0.24 correlation, their price movements are largely independent.

Performance

ATRA vs. AMZN - Performance Comparison

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

Returns By Period

In the year-to-date period, ATRA achieves a -41.68% return, which is significantly lower than AMZN's 1.49% return. Over the past 10 years, ATRA has underperformed AMZN with an annualized return of -32.50%, while AMZN has yielded a comparatively higher 20.96% annualized return.

ATRA

• 1D: -5.47%
• 1M: 7.65%
• YTD: -41.68%
• 6M: -40.02%
• 1Y: 30.89%
• 3Y*: -37.87%
• 5Y*: -51.88%
• 10Y*: -32.50%

AMZN

• 1D: 0.07%
• 1M: -12.03%
• YTD: 1.49%
• 6M: 0.81%
• 1Y: 10.10%
• 3Y*: 21.90%
• 5Y*: 6.61%
• 10Y*: 20.96%

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

ATRA vs. AMZN - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ATRA Atara Biotherapeutics, Inc.	-41.68%	35.91%	3.82%	-84.37%	-79.19%	-19.71%	19.19%	-52.59%	91.93%	27.46%
AMZN Amazon.com, Inc	1.49%	5.21%	44.39%	80.88%	-49.62%	2.38%	76.26%	23.03%	28.43%	55.96%

Correlation

The correlation between ATRA and AMZN is 0.11, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.11
Correlation (3Y) Calculated over the trailing 3-year period	0.16
Correlation (5Y) Calculated over the trailing 5-year period	0.25
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 ATRA and AMZN shifts across timeframes, from 0.11 (1 year) to 0.26 (10 years), reflecting how their relationship changes across market environments.

Fundamentals

Market Cap ATRA : $148.55M AMZN : $2.55T
EPS ATRA : -$0.72 AMZN : $8.37
PS Ratio ATRA : 6.14 AMZN : 3.42
Total Revenue (TTM) ATRA : $22.62M AMZN : $742.78B
Gross Profit (TTM) ATRA : $21.73M AMZN : $348.59B
EBITDA (TTM) ATRA : -$6.92M AMZN : $152.71B

Return for Risk

ATRA vs. AMZN — Risk / Return Rank

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

ATRA

ATRA Risk / Return Rank: 60
ATRA Sharpe Ratio Rank: 51
ATRA Sortino Ratio Rank: 68
ATRA Omega Ratio Rank: 74
ATRA Calmar Ratio Rank: 53
ATRA Martin Ratio Rank: 51

AMZN

AMZN Risk / Return Rank: 52
AMZN Sharpe Ratio Rank: 55
AMZN Sortino Ratio Rank: 49
AMZN Omega Ratio Rank: 48
AMZN Calmar Ratio Rank: 54
AMZN Martin Ratio Rank: 56

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.

ATRA vs. AMZN - Risk-Adjusted Trends Comparison

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

	ATRA	AMZN	Difference
Sharpe ratio: Return per unit of total volatility	0.22	0.33	-0.11
Sortino ratio: Return per unit of downside risk	1.49	0.67	+0.82
Omega ratio: Gain probability vs. loss probability	1.23	1.08	+0.15
Calmar ratio: Return relative to maximum drawdown	0.40	0.47	-0.06
Martin ratio: Return relative to average drawdown	0.69	1.07	-0.38

ATRA vs. AMZN - Sharpe Ratio Comparison

The current ATRA Sharpe Ratio is 0.22, which is lower than the AMZN Sharpe Ratio of 0.33. The chart below compares the historical Sharpe Ratios of ATRA and AMZN, 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

ATRA vs. AMZN - Drawdown Comparison

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

Drawdown Indicators

	ATRA	AMZN	Difference
Max Drawdown Largest peak-to-trough decline	-99.74%	-94.40%	-5.34%
Max Drawdown (1Y) Largest decline over 1 year	-76.89%	-21.74%	-55.15%
Max Drawdown (3Y) Largest decline over 3 years	-92.76%	-30.88%	-61.88%
Max Drawdown (5Y) Largest decline over 5 years	-99.16%	-56.15%	-43.01%
Max Drawdown (10Y) Largest decline over 10 years	-99.68%	-56.15%	-43.53%
Current Drawdown Current decline from peak	-99.34%	-14.81%	-84.53%
Average Drawdown Average peak-to-trough decline	-74.09%	-28.17%	-45.92%
Ulcer Index Depth and duration of drawdowns from previous peaks	44.62%	9.46%	+35.16%

Volatility

ATRA vs. AMZN - Volatility Comparison

Atara Biotherapeutics, Inc. (ATRA) has a higher volatility of 21.56% compared to Amazon.com, Inc (AMZN) at 10.21%. This indicates that ATRA's price experiences larger fluctuations and is considered to be riskier than AMZN based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ATRA	AMZN	Difference
Volatility (1M) Calculated over the trailing 1-month period	21.56%	10.21%	+11.35%
Volatility (6M) Calculated over the trailing 6-month period	131.96%	21.71%	+110.25%
Volatility (1Y) Calculated over the trailing 1-year period	143.95%	30.88%	+113.07%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	122.05%	35.67%	+86.38%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	100.25%	32.55%	+67.70%

Dividends

ATRA vs. AMZN - Dividend Comparison

Neither ATRA nor AMZN has paid dividends to shareholders.

Tickers have no history of dividend payments

Financials

Frequently Asked Questions

Can I hold both ATRA and AMZN in my portfolio?

ATRA and AMZN have a correlation of 0.11, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ATRA or AMZN?

ATRA has higher volatility (21.56%) compared to AMZN (10.21%). In terms of maximum drawdown, ATRA dropped -99.74% vs AMZN's -94.40%.

Which has better risk-adjusted returns?

AMZN currently has the higher Sharpe Ratio (0.33 vs 0.22), 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.