Equillium Reports Second Quarter 2020 Financial Results and Recent Highlights

Equillium Reports Second Quarter 2020 Financial Results and Recent Highlights

LA JOLLA, Calif., August 12, 2020 Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company developing itolizumab to treat severe

autoimmune and inflammatory disorders, today announced financial results for the second quarter 2020.

We have made significant progress across a

number of fronts since our last update, said Bruce Steel co-founder and chief executive officer of Equillium. The positive interim data we recently reported from the Phase 1b portion of our EQUATE

clinical trial of itolizumab in patients with acute graft-versus-host-disease (aGVHD), historically a particularly challenging and deadly indication, enhances our confidence in itolizumab as a potential life-saving treatment for these patients.

Together with the encouraging data reported by our partner, Biocon Limited (Biocon), demonstrating itolizumab (ALZUMAb ) reduced mortality in patients hospitalized with COVID-19 in their

Phase 2 trial conducted in India, we have gained additional and timely early evidence of drug activity across multiple autoimmune and inflammatory conditions, which supports our conviction that itolizumab s novel immune-modulating mechanism may

have promise in addressing a range of severe immuno-inflammatory disorders. We are now positioned for a number of upcoming catalysts, including proceeding with additional cohorts in our EQUATE trial, initiating a global randomized controlled

clinical trial in hospitalized patients with COVID-19, and advancing our Phase 1b EQUIP and EQUALISE trials in uncontrolled asthma and lupus nephritis, respectively.

Business Highlights:

Second Quarter 2020 Financial Results

development (R&D) expenses. Total R&D expenses for the three months ended June 30, 2020 were $3.9 million, compared with $4.3 million for the same period in 2019. The decrease in R&D expenses was primarily the result

of lower clinical development expense driven by the higher startup costs incurred for the EQUIP trial in the second quarter of 2019 as well as the pausing of that study during the second quarter of 2020 due to the COVID-19 pandemic. Other

contributors to the decrease in R&D expenses included lower consulting and travel expenses, offset by an increase in employee compensation and benefits primarily related to increased headcount.

General and administrative (G&A) expenses. Total G&A expenses for the three months ended June 30, 2020 were $2.7 million, compared

with $2.2 million for the same period in 2019. The increase in G&A expenses was primarily driven by greater non-cash stock-based compensation expense, offset by decreases in outside legal expenses,

salaries, and travel.

Net loss. Net loss for the three months ended June 30, 2020 was $6.5 million, or $(0.37) per basic and diluted

share, compared with a net loss of $6.1 million, or $(0.35) per basic and diluted share for the same period in 2019.

Cash, cash equivalents and

short-term investments. Equillium held cash, cash equivalents and short-term investments totaling $42.6 million at June 30, 2020, compared to $53.1 million at December 31, 2019.

Cash used in operations. Equillium used approximately $5.1 million of cash in its operations during the three months ended June 30, 2020,

compared to $6.3M in the prior quarter ended March 31, 2020.

Equillium is a clinical-stage biotechnology company leveraging deep understanding of immunobiology to develop novel products to treat severe autoimmune and

inflammatory disorders with high unmet medical need.

Equillium s initial product candidate, itolizumab (EQ001), is a clinical-stage, first-in-class monoclonal antibody that selectively targets the CD6-ALCAM pathway. This pathway plays a central role in modulating the

activity and trafficking of T cells that drive a number of immuno-inflammatory diseases. Itolizumab has been clinically validated with a favorable safety and tolerability profile based on its approved uses in India. Equillium acquired rights to

itolizumab through an exclusive partnership with Biocon. Biocon manufactures EQ001 and ALZUMAb at an FDA-regulated commercial scale facility; both products share the same primary monoclonal antibody sequence,

but are manufactured in different cell lines, and EQ001 is available in both intravenous and subcutaneous dosing whereas ALZUMAb is currently available in intravenous dosing only. Biocon has recently reported results from a study of ALZUMAb in

COVID-19 patients in India, and has subsequently received emergency use authorization from the Drugs Controller General of India for ALZUMAb for the treatment of CRS in COVID-19 patients with moderate to severe ARDS in India.

Equillium believes that itolizumab has the potential to be a best-in-class disease modifying therapeutic in several indications and is developing itolizumab in multiple severe immuno-inflammatory disorders acute graft-versus-host disease, uncontrolled asthma,

and lupus nephritis and is planning to submit an investigational new drug application for the treatment of COVID-19 patients. 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. Because such statements are subject to risks and uncertainties,

actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited to, statements regarding the impact of new advisors to guide the COVID-19 program, the potential

benefit of treating COVID-19 patients with itolizumab, planned clinical studies as a result of data reported by Biocon, Equillium s business strategy, Equillium s plans and expected timing for developing itolizumab, including the ability

to enroll additional cohorts in, and continue to report favorable result from, our EQUATE clinical trial and initiating a clinical trial in patients with COVID-19, the potential benefits of itolizumab, Equillium s cash runway and the impact of

the COVID-19 pandemic. Risks that contribute to the uncertain nature of the forward-looking statements include: uncertainties pending full review by Equillium of the Biocon dataset and uncertainties related to Equillium s capital requirements,

Equillium s plans and product development, including the initiation, restarting and completion of clinical trials, including a clinical trial of patients with COVID-19, uncertainties related to the actual impacts and length of such impacts

caused by the COVID-19 pandemic, uncertainties caused by the recent restarting of the EQUIP and EQUALISE clinical trials after a pause, whether the results from clinical trials will validate and support the safety and efficacy of itolizumab, having

to use cash in ways or on timing other than expected and the impact of market volatility on cash reserves. These and other risks and uncertainties are described more fully under the caption Risk Factors and elsewhere in Equillium s

filings and reports with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made. Equillium undertakes no obligation to update such

statements to reflect events that occur or circumstances that exist after the date on which they were made.

Christine Zedelmayer, Chief Operating Officer

Canale Communications

Condensed Consolidated Balance Sheets

Condensed Consolidated Statements of Operations

(In thousands, except share and per share data)