ATRA (Atara Biotherapeutics) Shares Buyback Ratio %: -35.33 (As of Sep. 03, 2026)

Author: Vera Yuan Vera Yuan
Vera Yuan
Vera Yuan
Director of Data and Quant Analytics at GuruFocus
Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
Reviewed by: Charlie Tian Charlie Tian
Charlie Tian
Charlie Tian
Founder & CEO of GuruFocus
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.

ATRA Atara Biotherapeutics Inc ATRA
22 GF Score
Price $9.53
GF Value $0.39
Valuation Significantly Overvalued
! 6 Warning Signs
View Full Analysis

What is Atara Biotherapeutics Shares Buyback Ratio %?

Atara Biotherapeutics ATRA +1.93% 22 Shares Buyback Ratio % is -35.33 as of Sep. 03, 2026. GuruFocus rates ATRA with a GF Score™ of 22/100 and a GF Value™ of $0.39 (Significantly Overvalued). The stock has 6 warning signs investors should review.

Shares Outstanding (EOP) are shares that have been authorized, issued, and purchased by investors and are held by them.

GuruFocus calculates shares buyback ratio using previous shares outstanding minus the current shares outstanding, and then divides by previous shares outstanding. Atara Biotherapeutics's current shares buyback ratio was -35.33%.

Atara Biotherapeutics Shares Buyback Ratio % Related Terms

Atara Biotherapeutics Shares Buyback Ratio % Historical Data

* Premium members only.

The historical data trend for Atara Biotherapeutics's Shares Buyback Ratio % can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Atara Biotherapeutics Shares Buyback Ratio % Chart

Atara Biotherapeutics Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Shares Buyback Ratio %
Get a 7-Day Free Trial Premium Member Only Premium Member Only -9.96 -4.64 -10.97 -37.60 -25.00

Atara Biotherapeutics Quarterly Data
Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26 Jun26
Shares Buyback Ratio % Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only -17.79 -3.32 -1.58 -16.22 -10.94
ATRA
22GF Score
Atara Biotherapeutics Inc ATRA
Shares Buyback Ratio % is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Atara Biotherapeutics Shares Buyback Ratio % Calculation

Atara Biotherapeutics's Shares Buyback Ratio for the fiscal year that ended in Dec. 2025 is calculated as

Shares Buyback Ratio=(Shares Outstanding (EOP) (A: Dec. 2024 ) - Shares Outstanding (EOP) (A: Dec. 2025 )) / Shares Outstanding (EOP) (A: Dec. 2024 )
=(5.859 - 7.324) / 5.859
=-25.00%

Atara Biotherapeutics's Shares Buyback Ratio for the quarter that ended in Jun. 2026 is calculated as

Shares Buyback Ratio=(Shares Outstanding (EOP) (A: Mar. 2026 ) - Shares Outstanding (EOP) (A: Jun. 2026 )) / Shares Outstanding (EOP) (A: Mar. 2026 )
=(8.512 - 9.443) / 8.512
=-10.94%

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Frequently Asked Questions Learn more about Shares Buyback Ratio % →
What does a Shares Buyback Ratio % of -35.33 mean?
Atara Biotherapeutics (ATRA) has a Shares Buyback Ratio % of -35.33 as of Sep. 03, 2026. Share buyback ratio is the percent change of a company's shares outstanding from two periods. View historical data on Atara Biotherapeutics and its competitors.
Is Atara Biotherapeutics' Shares Buyback Ratio % too high?
Atara Biotherapeutics' current Shares Buyback Ratio % is -35.33. Overall, Atara Biotherapeutics has a GF Score™ of 22/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Atara Biotherapeutics' Shares Buyback Ratio % compare to ICCC and FBIO?
Atara Biotherapeutics' Shares Buyback Ratio % of -35.33 can be compared against companies in the Biotechnology industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Shares Buyback Ratio % for a Biotechnology company?
A good Shares Buyback Ratio % depends on the Biotechnology industry context. However, Shares Buyback Ratio % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Shares Buyback Ratio % mean?
A high Shares Buyback Ratio % can signal that a stock is expensive relative to its fundamentals. Share buyback ratio is the percent change of a company's shares outstanding from two periods. View historical data on Atara Biotherapeutics and its competitors. Atara Biotherapeutics's current Shares Buyback Ratio % is -35.33. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Atara Biotherapeutics stock overvalued right now?
Based on GuruFocus' analysis, Atara Biotherapeutics (ATRA) is currently considered Significantly Overvalued. The stock's GF Value™ is $0.39, compared to a current price of $9.53 — trading 2343.6% above its estimated fair value. The current Shares Buyback Ratio % is -35.33. Atara Biotherapeutics' overall GF Score™ is 22/100 with 6 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Shares Buyback Ratio % calculated?
Shares Buyback Ratio % is calculated from a company's financial statements. For Atara Biotherapeutics (ATRA), the current Shares Buyback Ratio % is -35.33 as of Sep. 03, 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Is Atara Biotherapeutics (ATRA) Overvalued in 2026?

Based on GuruFocus' analysis, Atara Biotherapeutics stock appears to be overvalued. The current stock price of $9.53 is trading 2343.6% above its estimated GF Value™ of $0.39. GuruFocus considers Atara Biotherapeutics to be Significantly Overvalued.

Key valuation signals for ATRA:

  • Shares Buyback Ratio %: -35.33
  • GF Value™: $0.39 vs. price of $9.53 (2343.6% above fair value)
  • GF Score™: 22/100 with 6 warning signs

No single metric tells the full story. See the ATRA stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.

Atara Biotherapeutics Business Description

Other Exchanges 0HIY:UKAT20:Germany
Address 1280 Rancho Conejo Boulevard, Suite 200, Thousand Oaks, CA, USA, 91320
Atara Biotherapeutics Inc operates in the United States healthcare sector. It focuses on developing transformative therapies for patients with serious diseases, including solid tumors, hematologic cancers, and autoimmune diseases. It operates and manages business as one operating and reportable segment which is the business of developing therapeutics. The company's product candidates comprise Tab-cel, ATA3431, and ATA3219.
22GF Score

Get the complete analysis for ATRA

Shares Buyback Ratio % is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

$9.53
Price
$0.39
GF Value