Atara Biotherapeutics, Inc.

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Proprietary Materials

Isaac Ciechanover, MD

Founder, President, & CEO

Jefferies Global Healthcare Conference June 3, 2015

Special Note Regarding Forward-Looking Statements

This presentation and the accompanying oral presentation contain forward-looking statements. All statements other than statements of historical facts contained in this presentation, including statements regarding our future results of operations and financial position, business strategy, product candidates, collaborations, regulatory approvals, the possible impact of accelerated approval and whether the receipt of breakthrough therapy designation will meaningfully impact review by the U.S. Food and Drug Administration or the likelihood that a product will be found to be safe and effective, our ability to sell, manufacture or otherwise commercialize our product candidates, research and development costs, the timing and likelihood of success, plans and objectives of management for future operations, any royalty payments, and our ability to obtain and maintain intellectual property protection for our product candidates, are forward-looking statements. These statements involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. These and other important risk factors are described more fully in documents filed by Atara with the Securities and Exchange Commission (SEC), including Atara’s annual report on Form 10-K for the year ended December 31, 2014. Because forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified and some of which are beyond our control, you should not rely on these forward-looking statements as predictions of future events. The events and circumstances reflected in our forward-looking statements may not be achieved or occur and actual results could differ materially from those projected in the forward-looking statements. Except as required by applicable law, we do not plan to publicly update or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise. Certain information contained in this presentation and statements made orally during this presentation relates to or is based on studies, publications, surveys and other data obtained from third-party sources and Atara's own internal estimates and research. While Atara believes these third-party studies, publications, surveys and other data to be reliable as of the date of this presentation, it has not independently verified, and makes no representation as to the adequacy, fairness, accuracy or completeness of, any information obtained from third-party sources. In addition, no independent source has evaluated the reasonableness or accuracy of Atara’s internal estimates or research and no reliance should be made on any information or statements made in this presentation relating to or based on such internal estimates and research.

The content of this presentation is subject to copyright, which will be asserted by Atara and no part of this presentation may be reproduced, stored in a retrieval system, or transmitted in any form or by any means without prior permission in writing from Atara.

2

Foundation Built on World-Class Science

Sep 2012 License • • TGF β family protein modulators Seven product candidates Clinical Stage Programs PINTA 745 Ph 2 STM 434 Ph 1 T-cell EBV¹ Ph 2 T-cell CMV² Ph 2 T-cell WT1³ Ph 1 ¹ EBV = Epstein-Barr virus ² CMV = cytomegalovirus ³ WT1 = Wilms tumor 1 Sep 2014 Option • • T-cell immunotherapies Platform to develop additional product candidates 3

PINTA 745

PINTA 745

Protein-Energy Wasting in End-Stage Renal Disease (ESRD)

4

PINTA 745: Potential First in Class Molecule for PEW

Phase 2 Program with Established Proof of Concept (POC)

• • •

PINTA 745

Blocks myostatin, preventing it from inhibiting muscle production Improved lean body mass, physical function, inflammation in CKD¹ model Statistically significantly increased lean body mass and lower extremity muscle size in randomized, blinded Phase 1 study in prostate cancer; acceptable safety

Attractive Market

• • • PEW – state of muscle wasting, inflammation, malnutrition in ESRD; no approved therapies Decreased physical function, increased morbidity and mortality ~250K patients in US² and 800K worldwide

Upcoming Milestone

• • Randomized, blinded, placebo controlled Phase 2 trial (48 PEW patients)

Phase 2 data expected in 4Q:15

¹ CKD = chronic kidney disease ² Calculated utilizing 2011 data from USRDS extrapolated to December 31, 2013 as well as data from the recent study completed with DaVita Clinical Research 5

Clinical

POC

in Patients with Prostate Cancer Receiving ADT¹

8% 6% 4% 2% 0% (2)% (4)% (6)%

Lean Body Mass Increase N = 19 19 18 19

3.0 mg/kg PINTA 745 Placebo • • ~2% greater in lean body mass at EOS Difference in lean body mass compared to placebo continued to increase in 4 weeks after treatment (FUP)

PINTA 745

• •

Lower Extremity Muscle Size Increase

12% 10% 8% 6% 4% 2% 0% (2)% (4)% (6)%

N = P=0.065

18 19

EOS 3.0 mg/kg PINTA 745

18

FUP Placebo

19 P=0.007

At EOS, muscle size increased by ~1.2% from baseline At FUP, the change from baseline increased to 2.7% Source: Padhi et al., 2014. Pharmacological inhibition of myostatin and changes in lean body mass and lower extremity muscle size in patients receiving androgen deprivation therapy for prostate cancer. J Clin Endocrinol Metab 99(10):E1967 Note: The bottom and top of the boxes represent the first and third quartiles, and the horizontal band inside the box indicates the median value. The ends of the whiskers represent the minimum and maximum data in the range of observations Note: EOS: end-of-study (at day 29); FUP: Follow-up Period (one month after day 29) ¹ ADT = androgen deprivation therapy 6

Increased Mortality in Patients with PEW

Survival Rates Based Upon Serum Albumin Levels

100% 80% 60% 40% 20% Results at one year: ~11% of PEW¹ patients died within one year compared to < 3% of non PEW patients At three years: ~40% of PEW patients died in comparison with ~21% of non-PEW patients 0% 0 200 400 600 800 1000

Days from Entry into Database

Serum Albumin ≤ 3.8 g/dL Serum Albumin > 3.8 g/dL 1200 • • 54% of dialysis patients suffer from PEW

1

Large unmet need;

~250,000 2 US; ~800,000 Worldwide

1 2 Based on a recent study we completed with DaVita Clinical Research, a division of DaVita Healthcare Partners Inc.

Calculated utilizing 2011 data from USRDS extrapolated to December 31, 2013 as well as data from the recent study completed with DaVita Clinical Research

PINTA 745

7

Preclinical Proof of Concept in CKD Mice

PINTA 745 Ctrl CKD

Received from William E. Mitch, Baylor College of Medicine, M.D.

Myostatin is Over-Expressed in CKD

60 56 52 * P<0.05

Mice…

* 160 150 140 130 120 110

…and PINTA 745/s Has a Demonstrated Ability to Increase Body Weight…¹

* P<0.05

* 48 Placebo PINTA 745/s Placebo PINTA 745/s

…Increase Protein Synthesis…¹ …Limit Protein Degradation…¹

¹ Based on a preclinical study conducted with Amgen (Zhang L & Mitch WE,

FASEB J.

2011)

TNF α

.2

.175

.15

.125

.1

.075

.05

.025

0 P=0.033* Placebo PINTA 745/s

IL - 6

P=0.036* Placebo PINTA 745/s 14 12 10 8 6 4 2 0

…and Reduce Inflammation¹

8

Ongoing Phase 2 Trial in ESRD Patients with PEW

• • • •

PINTA 745

Phase 2 Data Expected 4Q:15

Phase 2 Trial in ESRD Patients with PEW

2014 2015 2016+ Randomized, double-blind, placebo-controlled trial in 48 patients Primary endpoint – change in muscle mass Secondary endpoints – physical function, monitoring of inflammatory markers, effects on use of supportive care drugs, QOL¹ assessments • • • Clinical Update No treatment related serious adverse events, grade ≥ 3 adverse events Initial regimen safe and well tolerated Study enrollment ongoing ¹ QOL = Quality of Life 9

MSK – Collaboration

10

Atara – MSK Collaboration Overview

Pathway to Commercialization Sponsored Research Ongoing and Planned POC Studies

• • • Allogeneic, cellular therapy platform technology developed by MSK Exclusive Option to license 3 clinical T-cell programs targeting some viral or cancer antigens Collaborate on further research to discover additional cellular therapies • Leverage existing technology to target other antigens • Develop additional cellular therapies and / or CAR-T cell programs 11

• • •

Platform Attributes

“Off-the shelf” cellular therapeutic option for patients Manufacturing process designed to reduce risk of product-related GvHD¹ MSK has developed libraries of EBV, CMV, and WT1 activated cell lines

MANUFACTURE

1

T-cells from Donor Blood

2

Antigen exposure, expansion and characterization EBV - CTLs

3

Targeted T cell Banks

1

THERAPEUTIC USE

1 GvHD = graft versus host disease ² HLA = human Leukocyte Antigen

Cancer or Viral Infection

2

Blood Test: HLA² Typing

3

Off-the-shelf T-cell Doses

12

Targeted T-Cell Therapy for EBV-LPD after HCT

Current Treatment Approach If Rituximab Failure

1 2

EBV - CTLs

3

EBV Reactivation: Lymphoma EBV-LPD Standard Rx: e.g., Rituximab

Rituximab (anti-CD20 Ab) is often used off-label as 1 st line therapy; Historical survival in rituximab refractory patients median 16-56 days 1

Off-the-shelf EBV-Targeted T-cell Doses Time Course of a Complete Response Following Administration of EBV Targeted T-cell 2

¹ Prockop, S et al., Proc AACR (2015), Fox 2014, Ocheni 2008, Uhlin 2014 2 MSK Data on file

13

Clinical Experience with EBV-CTL in EBV-LPD

EBV - CTLs

Two separate clinical trials of EBV-CTL conducted by MSK

Study 95-024 – Primary HCT and 3

rd

party donor derived EBV-CTL

Study 11-130 – 3

rd

party donor derived EBV-CTL

Includes EBV-LPD after HCT and solid organ transplant (SOT)

Results in EBV-LPD after HCT presented in a Clinical Trials Plenary session at AACR 2015 (April 19, 2015)

Results in EBV-LPD after SOT presented at ASCO 2015 (June 1, 2015)

14

Clinical POC in EBV-LPD after HCT: Phase 2 Study Results¹

Response Rate (RR): Primary vs. 3 rd party Donor

EBV - CTLs

2015 ASCO Presentation Overall Survival: Rituximab Refractory Patients Treated with 3 rd party EBV-CTL

EBV-CTL Source N Prior Rituximab RR 2 DCR 2

Study 11-130 Primary Donor 3 26 13 62% 69% 3 rd Party Donor 4 34 34 65% 70% 1 year OS = 71.8% 2 year OS = 63.8% N = 22 • • • • • RR with primary HCT and 3rd party donor comparable RR in rituximab treated patients similar to overall RR Complete and partial responses were durable & led to the overall survival results observed Well tolerated, few serious related AEs; no cytokine release, 1 grade 1 GvHD resolved without systematic therapy Historical survival in rituximab refractory patients median 16-56 days

¹ Prockop, S et al., Proc AACR (2015), Prockop, S et al., Proc ASCO (2015), Based on results from two clinical trials of EBV-CTL conducted by MSK 2 RR = complete response + partial response; DCR = Disease control rate = complete response + partial response + stable disease 3 Prockop, S et al., Proc AACR (2015) 4 Prockop, S et al., Proc ASCO (2015), Includes 22 patients from Study 11-130 plus 11 patients from Study 95-024 plus one patient treated under a treatment IND

Study 95-024 1 year OS = 56.3% 2 year OS = 46.9% N = 12 15

EBV-CTL: EBV-LPD after SOT – 2nd Indication¹

Response Rate (RR): EBV-LPD after SOT

EBV-CTL Source N Prior Rituximab Prior Chemo

3 rd Party Donor 13 13 11

RR 2

62% Note: All patients had failed to respond or relapsed following rituximab treatment; 11 SOT recipients also progressed after 1-5 courses of rituximab and chemotherapy OS in Rituximab Refractory EBV-LPD after SOT following treatment with 3rd party EBV-CTL • • • Results Response Rate (RR) for SOT of 62% is similar to RR for HCT • 1 durable CR (>22mo) and 7 durable PRs (range: 6-114 mo) in heavily pre-treated patients 12 of the 13 patients had high risk disease 3 (Age ≥ 60 years; poor performance status; elevated LDH) Overall Survival (OS) of 58% at 2 years compares favorably with historical data Historical Data 3 • • Historical data show 33% OS at 2 years in patients with incomplete response to rituximab Historical data show 0% OS at 2 years in patients with high risk disease

¹ Prockop, S et al., Proc ASCO (2015), Based on results from two clinical trials of EBV-CTL conducted by MSK 2 3 RR = complete response + partial response Choquet et al., 2007

16

Phase 2 Clinical POC in antiviral resistant CMV after HCT¹

Current Treatment Approach If Treatment Failure or Intolerance

1 2 3

CMV - CTLs CMV Reactivation: Viremia or Disease CMV Standard Rx: e.g., Ganciclovir or Foscarnet Off-the-shelf CMV-Targeted T-cell Doses Responses Following Administration of CMV Targeted T-cells 25

Evaluable Patients

Viremia Only

2

9

Complete Responses

7

Partial Responses

Response Rate = 64% 9

Evaluable Patients

CMV Disease

3

5

Complete Responses

1

Partial Responses

Response Rate = 67% Interim data presented at ASH 2014; No de novo GvHD or flare of pre-existing GvHD was noted

¹ Prockop, S et al.,

Proc ASH

(2014), MSK (data on file) 2 Responses in patients treated for viremia alone were considered complete if the viremia resolved completely and partial if it fell by more than 100-fold 3 Responses in disease were considered complete if all detectable CMV viremia and disease resolved and partial if patients became asymptomatic 17

STM 434

STM 434

Ovarian Cancer and Other Solid Tumors

18

STM 434: Potential First in Class Molecule for Ovarian Cancer and Other Solid Tumors

Phase 1 Program with Pre-clinical POC

• • • •

STM 434

Inhibits Activin A, which is involved in proliferation of OC and other solid tumor Reduced tumor size as single agent and with chemotherapy preclinically Demonstrated efficacy in granulosa / clear cell preclinical models of OC Gene mutations in FOXL2 and ARID1A link Activin to granulosa and clear cell OC, respectively

Attractive Market

• • • Opportunity for rapid development in difficult-to-treat clear and granulosa cell OC Expansion opportunities in serous OC and other solid tumors ~22K new OC cases in 2013 in the US 1

Upcoming Milestone

¹ National Cancer Institute estimate • • 3 part Phase 1 ongoing including dose escalation, dose expansion, chemo combo

Initial Phase 1 data expected 1H:16

19

Pre-clinical POC in Granulosa Cell Ovarian Tumors

Improvement in Survival 1 STM 434 Right Suppressed Tumor Growth

Normal Control Treated with Placebo

Ovarian Tumor Size

Inhibin Knockout Treated with Placebo Inhibin Knockout Treated with STM 434/s

Left

• • • • FOXL2 – granulosa cell tumor gene linkage 2 In normal cells, FOXL2 protein turns on follistatin when activin signal received; shuts off activin signal In granulosa cell OC, mutant FOXL2 is not able to turn on follistatin; activin signals unchecked Mutation was present in 97% of granulosa cell tumors ¹ Zhou X, et al.

Cell

. 2010; 142(4):531-43 2 Shah S. P., et al. NEJM. 2009; 360: 2719-29 20

Pre-clinical POC in Clear Cell Ovarian Tumors

Significant Reduction in Tumor Volume¹ Enhanced Body Weight¹ STM 434

• • • • ARID1A – clear cell tumor gene linkage 2 ARID1A mutations drive upregulation in signaling cascade triggered by ActR2B receptor Mutations present in 46%-55% of ovarian clear cell tumors Increased activin levels, like ARID1A mutations, may contribute to clear cell tumor proliferation ¹ Lu J, Haqq C, & Han HQ. ASCO Annual Meeting (2013) 2 Wiegard., et al. NEJM. 2010; 363: 1532-43 21

Ongoing First-in-Human (Phase 1) Study

First Patient Dosed 10/14; Initial Data Readout Expected 1H:16

Dose Escalation – in Solid Tumors Monotherapy Dose Expansion – in OC STM 434 Combo Chemotherapy – in OC

• • 2014 2015 2016+ Three part open-label Phase 1 study in up to 66 patients • • • • Objectives include: Evaluate whether STM 434 is safe and well tolerated Obtain preliminary efficacy data in ovarian cancer and other solid tumors Explore biomarkers predictive of response to treatment Define recommended Phase 2 dose 22

Multiple Opportunities for Value Creation

Validated Clinical Programs Attractive Markets

• • • • • • PINTA 745: Myostatin inhibitor for protein-energy wasting (PEW) MSK T-Cell Programs: Option to license T-cell platform technology with 3 clinical stage, “off-the-shelf”, immune therapies; Breakthrough Therapy Designation granted in February 2015 for EBV-CTL in patients with EBV-LPD STM 434: Activin inhibitor for ovarian cancer and solid tumors PEW: Increased morbidity / mortality; ~250K patients in the US¹ and 800K worldwide; no approved therapeutics EBV-LPD (~1200 patients in US + EU³) and anti-viral drug resistant CMV viremia or disease (~1100 patients in US + EU 4 ); potentially rapid path to approval Ovarian Cancer (OC): One of the deadliest cancers in women in the US; ~22K new cases in 2013 in the US 2 ; expansion opportunities in other solid tumors

Upcoming Milestones

• • • • PINTA 745: Phase 2 data in 4Q:15 EBV-CTL: Data presented at AACR Clinical Trials Plenary April 19, 2015 Oral presentation at ASCO June 1, 2015 MSK T-cell Programs: Data submitted to multiple conferences in 2015 STM 434: Phase 1 data in 1H:16 ¹ Calculated utilizing 2011 data from USRDS extrapolated to December 31, 2013 as well as data from the recent study completed with DaVita Clinical Research ² National Cancer Institute estimate 4 ³ Atara estimate based on the CIBMTR reports of number of HCT in the US in 2011 and a report in the journal

Haematologica

(2013) Atara estimate based on investigator experience 23

June 2015

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