– Phase 3 ELEVATE UC 12 trial reached full enrollment; topline data expected Q1 2022 with ELEVATE UC 52

– Liquidity position at ~$1.0 billion as of June 30, 2021 to support continued pipeline progress

Arena Pharmaceuticals, Inc. (Nasdaq: ARNA) today provided a corporate update and reported financial results for the second quarter ended June 30, 2021.

“With today’s announcement of the ELEVATE UC 12 trial reaching full enrollment, we look forward to a potentially transformational data readout of ELEVATE UC 12 and ELEVATE UC 52 in the first quarter of next year. We are also pleased with our recently announced partnership with Aristea to strengthen our mid-stage immunology pipeline,” said Amit D. Munshi, President and CEO of Arena. “We remain excited about moving forward to Phase 3 in atopic dermatitis — a decision that is further supported by updated OLE data. We are continuing to engage regulatory agencies worldwide in the design of the program.”

Key Program & Corporate Updates

Gastroenterology

• In August the Phase 3 ELEVATE UC 12 trial for etrasimod in ulcerative colitis reached full enrollment
• Topline data for both ELEVATE UC 12 and ELEVATE UC 52 expected contemporaneously in Q1 2022
• In August announced collaboration with Second Genome to identify microbiome biomarkers associated with clinical benefit for the Phase 2/3 CULTIVATE trial sub-study A for etrasimod in Crohn’s disease
• In August increased target enrollment in CULTIVATE sub-study A from 50 participants to 70 participants; dose-ranging data to read out in early Q2 2022; enhanced data may allow Sub-Study 1 to transition to a registrational study and reduce the overall timeline on the program
• In June the FDA granted Orphan Drug Designation status to etrasimod for the treatment of eosinophilic esophagitis

Dermatology

• In July we evaluated an updated OLE data set from the Phase 2 ADVISE trial for 2 mg etrasimod in atopic dermatitis that demonstrated meaningful effects at week 16 of the OLE period on validated Investigator Global Assessment (vIGA) at 47%, Eczema Area and Severity Index (EASI-75) at 72%, and Peak Pruritis Numeric Rating Scale (PP-NRS) at 61% with consistent safety profile out to one year
• In July the Phase 2 trial for etrasimod in alopecia areata was amended to add a 3 mg cohort and expand patient population subtypes; topline data expected 2H 2022
• In April during a late-breaking session at The American Academy of Dermatology Virtual Meeting, data from the Phase 2 ADVISE trial in atopic dermatitis was presented that measured the impact of etrasimod on patient and clinician reported outcomes

Cardiovascular

• In July a Phase 2 trial for temanogrel in Raynaud’s phenomenon secondary to systemic sclerosis was initiated
• In July a Phase 2 trial for APD418 in acute heart failure was initiated
• In June the first participant was dosed in the Phase 2 trial for temanogrel in microvascular obstruction

Corporate Updates

• In July we entered into a strategic collaboration and option agreement with Aristea for the development of RIST4721, an oral, selective CXCR2 antagonist being developed for the treatment of palmoplantar pustulosis (PPP) and other neutrophil-mediated diseases
• In July Doug Manion was appointed as Executive Vice President, Research & Development
• In June Steve Schoch was appointed to the Board of Directors and as chair of the Audit Committee
• In May and June Arena earned score upgrades from ISS (Prime rating) and MSCI (BB to A rating) following the 2021 Arena Environmental, Social, Governance (ESG) Report published in April

Financial Update

Second Quarter 2021 Financial Results

• Research and development (R&D) expenses for the second quarter totaled $112.5 million compared to $64.9 million in the same period 2020. This increase was primarily driven by our advancing clinical studies, including the etrasimod Phase 3 program, as well as an increase in personnel expenses to support our clinical programs. The R&D non-cash, share-based compensation was $8.7 million in the second quarter as compared to $6.3 million in the same period 2020
• Selling, general and administrative (SG&A) expenses for the second quarter totaled $31.9 million, compared to $22.9 million in the second quarter of 2020. This increase was primarily driven by an increase in personnel expenses and other professional fees. The SG&A non-cash, share-based compensation was $9.1 million in the second quarter as compared to $6.0 million in the same period 2020
• Net loss for the second quarter was $146.1 million compared to net loss of $84.9 million for the same period in 2020
• Basic and diluted net loss per share for the second quarter was $2.40 compared to basic and diluted net loss per share of $1.61 for the same period in 2020
• Cash, cash equivalents and marketable securities were $1.0 billion at June 30, 2021 as compared to $1.1 billion at December 31, 2020

Conference Call & Webcast Information

Arena will host a conference call and live webcast to discuss the results with the investment community today, Thursday, August 5, 2021, at 4:30 PM ET, to discuss the financial results and corporate update.

Conference call will be broadcast live in listen-only mode on the company’s investor relations website at https://invest.arenapharm.com/events-presentations. Shortly after the event, a recording will be archived under the investor relations section of Arena’s website for 30 days.

About Arena Pharmaceuticals

ARENA Pharmaceuticals is a team with a singular purpose – deliver important medicines to patients.

In a rapidly changing global market, we work with a sense of urgency every day to understand the needs of all our stakeholders, identify bold, sometimes disruptive, ideas to get medicines to patients, and relentlessly execute until it’s done.

ARENA - Care More. Act Differently.

Etrasimod, temanogrel, and APD418 are investigational compounds that are not approved for any use in any country.

Forward-Looking Statements

Certain statements in this press release are forward-looking statements that involve a number of risks and uncertainties. Such forward-looking statements may be identified by words such as “expected,” “look forward to,” “on track for,” “plans,” and “will,” and include, without limitation, statements about the following: Arena’s clinical programs, including expectations regarding study progress, the timing of data readouts for ongoing and anticipated trials, expectations regarding the commencement of additional studies, plans to provide updates on programs and trials, and other statements under “Key Program & Corporate Updates” above. For such statements, Arena claims the protection of the Private Securities Litigation Reform Act of 1995. Actual events or results may differ materially from Arena’s expectations. Factors that could cause actual results to differ materially from the forward-looking statements include, but are not limited to, the following: topline data may not accurately reflect the complete results of a particular study or trial; results of clinical trials and other studies are subject to different interpretations and may not be predictive of future results; clinical trials and other studies may not proceed at the time or in the manner expected or at all; the timing and outcome of research, development and regulatory review is uncertain, and Arena’s drug candidates may not advance in development or be approved for marketing; enrolling patients in Arena’s ongoing and intended clinical trials is competitive and challenging; the duration and severity of the coronavirus disease (COVID-19) pandemic, including but not limited to the impact on Arena’s clinical operations, the operations of Arena’s suppliers, partners, collaborators, licensees, and capital markets, which in each case remains uncertain; risks related to developing and commercializing drugs; Arena will need additional funds to advance all of its programs; the impact of competition; risks related to unexpected or unfavorable new data; the risk that regulatory agencies may interpret or weigh the importance of data differently and reach different conclusions than Arena or others, request additional information, have additional recommendations or change their guidance or requirements before or after approval; satisfactory resolution of litigation or other disagreements with others; and risks related to the enforcement of Arena’s and third parties’ intellectual property rights. Additional factors that could cause actual results to differ materially from those stated or implied by Arena’s forward-looking statements are disclosed in Arena’s filings with the Securities and Exchange Commission (SEC), including but not limited to Arena’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, which was filed with the SEC on May 5, 2021. These forward-looking statements represent Arena’s judgment as of the time of this release. Arena disclaims any intent or obligation to update these forward-looking statements, other than as may be required under applicable law.

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