Atara Biotherapeutics (ATRA) investor relations material

Executive summary

• Focused on T-cell immunotherapy, with lead product tab-cel (Ebvallo) approved in EEA, UK, and Switzerland; U.S. approval remains pending after FDA issued two Complete Response Letters citing manufacturing and clinical trial design concerns.

• Productive Type A meeting with FDA confirmed opportunity to resubmit tabelecleucel BLA based on updated Phase 3 ALLELE trial data, with additional patients and longer follow-up.

• All manufacturing, clinical, and regulatory responsibilities for tab-cel transferred to Pierre Fabre, who is now responsible for global development and commercialization.

• Company has executed multiple workforce reductions, retaining only essential staff, and is actively exploring strategic alternatives, including potential mergers, asset sales, or liquidation.

• Significant year-over-year reduction in costs and operating expenses by 87% for the quarter.

Financial highlights

• Commercialization revenue for the six months ended June 30, 2026 was $1.1M, down from $115.7M in the prior year period due to the one-time recognition of deferred revenue in 2025 upon transfer of manufacturing to Pierre Fabre.

• Total revenues were $0.6 million for Q2 2026, compared to $17.6 million in Q2 2025, reflecting lower deferred revenue recognition.

• Net loss for the six months ended June 30, 2026 was $9.0M, compared to net income of $40.4M in the prior year period.

• Cash, cash equivalents, and short-term investments totaled $9.9M as of June 30, 2026.

• Operating cash outflow for the six months ended June 30, 2026 was $6.4M, a significant improvement from $35.5M outflow in the prior year period.

Outlook and guidance

• Existing cash and investments are insufficient to fund operations for the next 12 months; substantial doubt exists about the ability to continue as a going concern.

• Cash and investments as of June 30, 2026, combined with efficiencies, expected to fund operations into mid-2027.

• Plans to secure additional capital through equity, debt, or strategic transactions; failure to do so may result in further reductions or liquidation.

• Regulatory update on tab-cel BLA resubmission expected in Q3 2026.

• Operating expenses expected to decline significantly year-over-year due to cost-reduction initiatives.