Atara Biotherapeutics (ATRA) Stock Chart & Stock Price History $15.85 +0.22 (+1.41%) Closing price 10/8/2025 04:00 PM EasternExtended Trading$16.11 +0.26 (+1.67%) As of 10/8/2025 06:46 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Atara Biotherapeutics Stock Price Performance The Atara Biotherapeutics (ATRA) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 102.94%, with a year-to-date return of 19.08%. In the past month, the stock has increased 32.75%, reflecting recent market activity. As of the latest close, Atara Biotherapeutics traded at $15.85 with a market cap of $111.27 million and volume of 69,650 shares. Five years ago, the stock traded at a split-adjusted price of $361.75, representing a 95.62% decrease over that period. At the time, it had a market cap of $1.08 billion and a volume of 16,470 shares. Receive ATRA Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Atara Biotherapeutics and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. 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Read our full terms of service and privacy policy. 5 Day Performance+9.99%1 Month Performance+32.75%3 Month Performance+71.72%Year-To-Date Performance+19.08%1 Year Performance+102.94%5 Year Performance-95.62% ATRA Stock Chart for Thursday, October, 9, 2025 ATRA Chart by TradingView Atara Biotherapeutics Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization10/08/2025$15.63$15.85+1.41%$15.97$14.8569,650 shs$111.27 million10/07/2025$13.98$15.63+11.80%$15.90$13.89115,223 shs$109.72 million10/06/2025$14.41$13.98-2.98%$14.41$13.9244,002 shs$98.18 million10/03/2025$14.48$14.41-0.48%$14.85$14.0934,906 shs$101.20 million10/02/2025$14.45$14.48+0.21%$14.64$14.0235,295 shs$101.65 million10/01/2025$14.33$14.45+0.84%$14.78$14.0053,997 shs$101.44 million09/30/2025$13.81$14.33+3.77%$14.57$13.1289,560 shs$100.64 million09/29/2025$13.74$13.81+0.51%$13.95$13.5044,941 shs$96.95 million09/26/2025$13.83$13.74-0.65%$14.02$12.9536,834 shs$96.46 million09/25/2025$14.26$13.83-3.02%$14.24$13.4834,705 shs$97.09 million Get the Latest News and Ratings for ATRA and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Atara Biotherapeutics and its competitors with MarketBeat's FREE daily newsletter. 09/24/2025$12.97$14.26+9.95%$14.91$12.82197,897 shs$100.15 million09/23/2025$12.30$12.97+5.45%$13.00$12.0057,851 shs$91.05 million09/22/2025$12.05$12.30+2.07%$12.30$11.6754,062 shs$86.35 million09/19/2025$12.07$12.05-0.17%$12.27$11.6677,451 shs$84.59 million09/18/2025$11.59$12.07+4.14%$12.07$11.3335,264 shs$84.77 million09/17/2025$11.51$11.59+0.70%$11.83$11.5113,851 shs$81.36 million09/16/2025$11.94$11.51-3.60%$12.00$11.5119,547 shs$80.80 million09/15/2025$12.12$11.94-1.49%$12.50$11.7731,487 shs$83.86 million09/12/2025$12.16$12.12-0.33%$12.25$11.8037,458 shs$85.12 million09/11/2025$11.78$12.16+3.23%$12.22$11.7529,000 shs$85.36 million09/10/2025$11.94$11.78-1.34%$12.09$11.7011,996 shs$82.70 million09/09/2025$12.18$11.94-1.97%$12.18$11.8040,682 shs$83.86 million09/08/2025$12.91$12.18-5.65%$12.75$11.8082,732 shs$85.50 million Related Companies ORIC Stock Price Chart KMDA Stock Price Chart AURA Stock Price Chart KRRO Stock Price Chart DSGN Stock Price Chart DRUG Stock Price Chart ANNX Stock Price Chart LXEO Stock Price Chart BNTC Stock Price Chart DMAC Stock Price Chart Receive ATRA Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Atara Biotherapeutics and its competitors with MarketBeat's FREE daily newsletter. 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