EX-99.1

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EX-99.1

EX-99.1

Exhibit 99.1

First Tracks Biotherapeutics Announces First Quarter 2026 Financial Results and Provides Business Update

• First Tracks launched April 20th with a two-year cash-runway to advance ANB033 through celiac disease and eosinophilic esophagitis Phase 1b data and plans to initiate Phase 2 trials across four indications

SAN DIEGO, CA — May 14, 2026 — First Tracks Biotherapeutics, Inc. (Nasdaq: TRAX), a clinical-stage biotechnology company advancing antibody therapeutics that modulate immune pathways implicated in autoimmune and inflammatory diseases, today reported financial results for the first quarter ended March 31, 2026, and provided a business update.

“First Tracks Bio launched to advance a focused, high-value immunology portfolio that can create meaningful impact and a future where autoimmune diseases no longer define a patient’s life,” said Daniel Faga, president and chief executive officer. “We remain committed to executing with speed, rigor and financial discipline with a focus on ANB033, a CD122 antagonist, as we prepare for multiple clinical readouts in celiac disease and eosinophilic esophagitis. Additionally, we completed a productive End-of-Phase 2 meeting for rosnilimab with FDA, and we are assessing ROE-maximizing strategic options for this asset, including potential for development in rheumatoid arthritis and other indications.”

ANB033 (CD122 antagonist)

• Phase 1b trial in celiac disease ongoing

o 60-patient trial assessing one dose level of subcutaneously administered ANB033 vs. placebo (randomized 1:1) across two different cohorts

▪ Cohort 1 (n=30) is a gluten-challenge study to assess the prevention of mucosal damage through six weeks

▪ Cohort 2 (n=30) is a study to assess the possibility of mucosal healing through 12 weeks

o Top-line Phase 1b data anticipated in Q4 2026

• Phase 1b trial in eosinophilic esophagitis ongoing

o 50-patient cohort assessing one dose level of subcutaneously administered ANB033 vs. placebo (randomized 1:1) through 12 weeks

o Top-line Phase 1b data anticipated in mid-2027

Rosnilimab (Pathogenic T Cell Depleter)

• Completed End-of-Phase 2 (EOP2) meeting with FDA in Q1 2026. The agency provided constructive feedback on a registrational Phase 3 path in rheumatoid arthritis (RA), a disease with significant remaining patient unmet need

• Currently assessing ROE-maximizing strategic options that may include a global partnership, out-license or asset financing to progress the potential development of rosnilimab in RA and other indications

ANB101 (BDCA2 modulator)

• Phase 1a trial in healthy volunteers nearing completion

First Quarter 2026 Financial Results

• The separation of AnaptysBio, Inc., and First Tracks Biotherapeutics was completed on April 20, 2026. As a result, in the first quarter of 2026, the financial results include assets, liabilities and expenses related to both companies. The combined financial statements reflect allocations of certain expenses from the financial statements of Anaptys including research and development expenses and administrative expenses. These allocations include, but are not limited to, executive management, employee compensation and benefits, facilities and operations, information technology, business development, financial services (such as accounting, audit, and tax), legal, insurance and stock-based compensation.

• Launched First Tracks with $180 million in cash and cash equivalents on April 20, 2026

• Research and development expenses were $34.0 million for the three months ended March 31, 2026, compared to $41.5 million for the three months ended March 31, 2025. The decrease for the three months ended March 31, 2026 was primarily due to decreased development costs for rosnilimab and ANB032 offset by increased costs relating to the phase 1 trials for ANB033.

• General and administrative expenses were $18.9 million for the three months ended March 31, 2026, compared to $9.8 million for the three months ended March 31, 2025. The increase was due primarily to the allocation of legal costs for the separation of the company and non-cash stock compensation costs.

• Net loss was $50.5 million for the three months ended March 31, 2026, compared to a net loss of $47.2 million for the three months ended March 31, 2025.

About First Tracks Biotherapeutics

First Tracks Biotherapeutics is a clinical stage biotechnology company advancing antibody therapies that modulate immune pathways implicated in autoimmune and inflammatory diseases. Its pipeline includes ANB033, a CD122 antagonist in development for celiac disease and eosinophilic esophagitis; rosnilimab, a pathogenic T cell depleter in development for rheumatoid arthritis; and ANB101, a BDCA2 modulator. To learn more, visit www.FirstTracksBio.com or follow us on LinkedIn.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the “safe harbor” provisions of the P