EQ

EX-99.1

2 eq-ex99_1.htm

EX-99.1

EX-99.1

Exhibit 99.1

Equillium Reports Second Quarter 2026 Financial Results and Recent Corporate Highlights

Phase 1 proof-of-mechanism study of EQ504 initiation expected in Q4 2026, with data expected approximately six months thereafter

Cash and cash equivalents of $57.2 million expected to fund operations into 2029

LA JOLLA, California, August 13, 2026 – Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology innovator with a mission to develop highly impactful therapies to treat severe autoimmune and inflammatory disorders, today reported financial results for the second quarter ended June 30, 2026, and provided a corporate update highlighting continued progress in support of EQ504, its potent and selective aryl hydrocarbon receptor (AhR) modulator.

“We continue to make meaningful progress advancing EQ504 toward the clinic," said Bruce Steel, Chief Executive Officer of Equillium. "Our colon-targeted formulated product has been manufactured, and we plan to submit the dossier for our Phase 1 study in Australia imminently. We expect to initiate this study in the fourth quarter of 2026 and report topline data approximately six months thereafter. The study is designed as a conventional randomized, double-blind, placebo-controlled single and multiple ascending dose study (SAD/MAD) in healthy volunteers, focused on safety, tolerability, pharmacokinetics and pharmacodynamics to assess proof of mechanism. Subject to supportive Phase 1 data, we anticipate expeditiously initiating a placebo-controlled study to assess the safety, tolerability, and efficacy of EQ504 in patients with moderately to severely active ulcerative colitis. Key study parameters are intended to leverage other AhR modulator clinical datasets in ulcerative colitis to facilitate an efficient patient proof-of-concept study.”

Recent Corporate & Clinical Highlights:

• Advancing EQ504 toward the clinic, with the Phase 1 proof-of-mechanism study expected to initiate in the fourth quarter of 2026, and topline data anticipated approximately six months thereafter.

• Initiated IND-enabling development activities for EQ504 as a potential inhaled therapy to treat inflammatory lung diseases.

• Initiated IND-enabling development activities for EQ302, an oral, bi-specific inhibitor of IL-15 and IL-21, intended to be developed for celiac disease.

• Established a Clinical Advisory Board chaired by Professor Bruce Sands, M.D. (Chair, Feinstein IBD Clinical Center, Mount Sinai) to guide the design and execution of the EQ504 clinical program in ulcerative colitis.

Second Quarter 2026 Financial Results

Cash and cash equivalents totaled $57.2 million as of June 30, 2026, compared to $61.3 million as of March 31, 2026. Equillium believes that its cash and cash equivalents on the balance sheet as of June 30, 2026, are capable of funding its currently planned operations into 2029.

Research and development (R&D) expenses for the second quarter of 2026 were $2.8 million, compared with $4.1 million for the same period in 2025.

General and administrative (G&A) expenses for the second quarter of 2026 were $2.4 million, compared with $2.1 million for the same period in 2025.

Net loss for the second quarter of 2026 was $4.7 million, or $(0.04) per basic and diluted share, compared with a net loss of $5.7 million, or $(0.16) per basic and diluted share for the same period in 2025.

About EQ504

EQ504 is an investigational potent and selective aryl hydrocarbon receptor (AhR) modulator with a multi-modal, non-immunosuppressive mechanism of action designed to be complementary to other inflammation and immunology agents. AhR is critical to barrier organ tissue physiology and immunology, maintaining barrier function and promoting tissue repair and regeneration, while regulating resident immune cells with anti-inflammatory responses. EQ504’s preclinical properties provide the potential for targeted, local delivery via enteric coating for the treatment of ulcerative colitis and other gastrointestinal diseases or inhaled formulations for the treatment of inflammatory lung diseases.

About Equillium Equillium is a biotechnology innovator with a mission to develop highly impactful therapies to treat severe autoimmune and inflammatory disorders.

For more information, visit www.equilliumbio.com.

Forward Looking Statements

Statements contained in this press release regarding matters that are not historical facts are “forward-looking Statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by the use of words such as “anticipate”, “believe”, “could”, “continue”, “expect”, “estimate”, “may”, “plan”, “outlook”, “future”, “potential” and “project” and other similar expressions that predict or indicate future events or trends or that are not statements of historical matters. These statements include, but are not limited to, statements regarding Equillium’s plans a

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