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Arena Pharmaceuticals, Inc. (ARNA)

For informational purposes only. Not financial advice. Analysis by Sedat Aydin, Founder & Editor-in-Chief | AI-powered analysis. Data sourced from SEC filings and institutional-grade financial providers. Editorially reviewed. Not financial advice.

Arena Pharmaceuticals, Inc. (ARNA) trades at $99.99 with AI Score 53/100 (Hold). Arena Pharmaceuticals, Inc. is a biopharmaceutical company focused on developing novel medicines. Market cap: 0, Sector: Healthcare.

Last analyzed: Feb 9, 2026
Arena Pharmaceuticals, Inc. is a biopharmaceutical company focused on developing novel medicines. Acquired by Pfizer in 2022, Arena continues to advance its clinical programs across multiple therapeutic areas.
53/100 AI Score

Arena Pharmaceuticals, Inc. (ARNA) Healthcare & Pipeline Overview

CEOAmit Munshi
Employees448
HeadquartersSan Diego, CA, US
IPO Year2000

Arena Pharmaceuticals, now a subsidiary of Pfizer, advances a diverse pipeline of novel medicines targeting immune-inflammatory diseases and cardiovascular conditions, offering potential for significant growth within the biotechnology sector through strategic collaborations and clinical trial advancements.

Data Provenance | Financial Data Quantitative Analysis NASDAQ Analysis: Feb 9, 2026

Investment Thesis

Investing in Arena Pharmaceuticals, now under Pfizer's umbrella, presents a notable opportunity due to its diverse pipeline of clinical programs targeting significant unmet medical needs. Etrasimod, with its Phase III trials for ulcerative colitis and atopic dermatitis, represents a near-term value driver. Positive trial outcomes and subsequent regulatory approvals could lead to substantial revenue generation. The company's strategic collaborations further de-risk its development programs and provide additional revenue streams. While the company currently has a negative P/E ratio of -8.82 and a substantial negative profit margin of -1149244.4%, the potential for future profitability hinges on the successful commercialization of its pipeline assets. The low beta of 0.55 suggests lower volatility compared to the broader market.

Based on FMP financials and quantitative analysis

Key Highlights

  • Etrasimod is in Phase III clinical trials for ulcerative colitis, indicating potential for near-term revenue generation upon successful completion and regulatory approval.
  • Gross margin of 100.0% reflects the nature of a biotechnology company focused on drug development, where revenue is primarily derived from licensing agreements and milestone payments.
  • Collaboration agreements with United Therapeutics Corporation and Everest Medicines Limited provide financial support and expand the geographic reach of Arena's pipeline.
  • The company's acquisition by Pfizer in March 2022 provides access to significant resources and expertise, enhancing its ability to advance its clinical programs.
  • Ralinepag (APD811) is in Phase III clinical trials for pulmonary arterial hypertension, representing another potential revenue stream.

Competitors & Peers

Strengths

  • Diverse pipeline of clinical programs.
  • Strong intellectual property portfolio.
  • Collaboration agreements with leading pharmaceutical companies.
  • Acquisition by Pfizer provides access to significant resources.

Weaknesses

  • High research and development costs.
  • Dependence on clinical trial outcomes.
  • Negative profit margin.
  • Regulatory hurdles in drug development.

Catalysts

  • Upcoming: Etrasimod Phase III trial results for ulcerative colitis (2026-2027).
  • Upcoming: Etrasimod Phase III trial results for atopic dermatitis (2026-2027).
  • Ongoing: Advancement of Olorinab (APD371) in Phase IIb trials for irritable bowel syndrome.
  • Ongoing: Development of Ralinepag (APD811) for pulmonary arterial hypertension.
  • Ongoing: Potential for new strategic collaborations and partnerships.

Risks

  • Potential: Clinical trial failures could delay or halt drug development.
  • Potential: Regulatory setbacks could prevent drug approval.
  • Ongoing: Competition from other biotechnology and pharmaceutical companies.
  • Ongoing: High research and development costs could impact profitability.
  • Potential: Patent expirations could reduce market exclusivity.

Growth Opportunities

  • Etrasimod Commercialization: Etrasimod, a selective sphingosine 1-phosphate (S1P) receptor modulator, represents a significant growth opportunity. The global ulcerative colitis market is projected to reach $8.3 billion by 2028. Successful Phase III trial outcomes and subsequent regulatory approval could position Etrasimod as a leading treatment option, driving substantial revenue growth for Arena/Pfizer. Timeline: Potential market launch within 2-3 years following successful trial completion and regulatory approval.
  • Atopic Dermatitis Expansion: Etrasimod is also in Phase III trials for atopic dermatitis, a chronic inflammatory skin condition. The global atopic dermatitis market is expected to reach $16.4 billion by 2027. Positive trial results could expand Etrasimod's market reach and contribute significantly to revenue growth. Timeline: Potential market launch within 2-3 years following successful trial completion and regulatory approval.
  • Olorinab Development: Olorinab (APD371), a selective cannabinoid receptor-2 (CB2) agonist, is in Phase IIb trials for the treatment of abdominal pain associated with irritable bowel syndrome (IBS). The global IBS market is projected to reach $3.4 billion by 2027. Successful trial outcomes could position Olorinab as a novel treatment option for IBS, driving future revenue growth. Timeline: Potential market launch within 3-5 years following successful trial completion and regulatory approval.
  • Ralinepag Advancement: Ralinepag (APD811), an oral prostacyclin receptor agonist, is in Phase III trials for pulmonary arterial hypertension (PAH). The global PAH market is expected to reach $7.2 billion by 2028. Successful trial results and regulatory approval could establish Ralinepag as a valuable treatment option for PAH, contributing to revenue growth. Timeline: Potential market launch within 2-3 years following successful trial completion and regulatory approval.
  • Strategic Collaborations: Arena's existing collaboration agreements with United Therapeutics Corporation, Everest Medicines Limited, and others provide ongoing revenue streams through milestone payments and royalties. Expanding these collaborations or forging new partnerships could further de-risk development programs and accelerate commercialization efforts, driving long-term growth. Timeline: Ongoing, with potential for new collaborations in the near to medium term.

Opportunities

  • Expansion of Etrasimod into new indications.
  • Development of novel therapies for unmet medical needs.
  • Strategic acquisitions and partnerships.
  • Growing demand for innovative medicines.

Threats

  • Competition from other biotechnology and pharmaceutical companies.
  • Clinical trial failures.
  • Regulatory setbacks.
  • Patent expirations.

Competitive Advantages

  • Strong intellectual property portfolio protecting its drug candidates.
  • Expertise in G protein-coupled receptor (GPCR) drug discovery.
  • Established collaborations with leading pharmaceutical companies.
  • Advanced clinical programs with potential for significant market share.

About ARNA

Arena Pharmaceuticals, Inc., established in 1997 and based in Park City, Utah, is a biopharmaceutical company dedicated to discovering, developing, and commercializing novel medicines. The company's focus is on addressing unmet medical needs through innovative pharmacology and pharmacokinetics. Arena's investigational clinical programs span various therapeutic areas, including immune-inflammatory diseases and cardiovascular conditions. Key programs include Etrasimod (APD334), undergoing Phase III trials for ulcerative colitis and atopic dermatitis, as well as Phase II trials for Crohn's disease, alopecia areata, and eosinophilic esophagitis. Other notable programs include Olorinab (APD371) in Phase IIb trials for irritable bowel syndrome-related abdominal pain, APD418 in Phase II trials for acute heart failure, Temanogrel for coronary microvascular obstruction in Phase II trials, and ralinepag (APD811) in Phase III trials for pulmonary arterial hypertension. Arena has established collaboration agreements with companies such as United Therapeutics Corporation, Everest Medicines Limited, Eisai Co., Ltd. and Eisai Inc., Boehringer Ingelheim International GmbH, Beacon Discovery, Inc., and Aristea Therapeutics, Inc. As of March 11, 2022, Arena Pharmaceuticals operates as a subsidiary of Pfizer Inc., marking a significant milestone in its evolution and providing access to greater resources and expertise.

What They Do

  • Develop novel medicines with unique pharmacology and pharmacokinetics.
  • Focus on immune-inflammatory diseases and cardiovascular conditions.
  • Conduct Phase III clinical trials for Etrasimod in ulcerative colitis and atopic dermatitis.
  • Advance Olorinab (APD371) in Phase IIb trials for irritable bowel syndrome.
  • Develop Ralinepag (APD811) for pulmonary arterial hypertension.
  • Collaborate with other pharmaceutical companies to expand their reach and resources.

Business Model

  • Develop and out-license drug candidates to other pharmaceutical companies.
  • Generate revenue through milestone payments and royalties from collaborations.
  • Potentially commercialize drugs directly, depending on Pfizer's strategic decisions.
  • Focus on research and development to create innovative therapies.

Industry Context

Arena Pharmaceuticals operates within the highly competitive biotechnology industry, characterized by rapid innovation and significant regulatory hurdles. The industry is driven by the increasing demand for novel therapies to address unmet medical needs. Arena's focus on immune-inflammatory diseases and cardiovascular conditions aligns with key market trends. Competitors include companies like ABCM, CERE, ISEE, MOR, and MRTX, each vying for market share in specific therapeutic areas. The biotechnology industry is experiencing substantial growth, fueled by advancements in genomics, personalized medicine, and drug delivery technologies.

Key Customers

  • Pharmaceutical companies that license Arena's drug candidates.
  • Patients who may benefit from Arena's innovative therapies.
  • Healthcare providers who prescribe Arena's medications (if commercialized directly).
AI Confidence: 73% Updated: Feb 9, 2026

Financials

Chart & Info

Arena Pharmaceuticals, Inc. (ARNA) stock price: $99.99 (+0.00, +0.00%)

Latest News

Analyst Consensus

Consensus Rating

Aggregated Buy/Hold/Sell recommendations from Benzinga, Yahoo Finance, and Finnhub for ARNA.

Price Targets

Wall Street price target analysis for ARNA.

MoonshotScore

53/100

What does this score mean?

The MoonshotScore rates ARNA's growth potential on a scale of 0-100 across multiple factors including innovation, market disruption, financial health, and momentum.

ARNA Healthcare Stock FAQ

What does Arena Pharmaceuticals, Inc. do?

Arena Pharmaceuticals, now a subsidiary of Pfizer, is a biopharmaceutical company focused on developing novel medicines for immune-inflammatory diseases and cardiovascular conditions. The company's business model revolves around discovering and developing drug candidates, conducting clinical trials, and potentially out-licensing or commercializing these therapies. Key programs include Etrasimod for ulcerative colitis and atopic dermatitis, Olorinab for irritable bowel syndrome, and Ralinepag for pulmonary arterial hypertension. Arena's strategic collaborations with other pharmaceutical companies further support its research and development efforts.

Is ARNA stock worth researching?

As of March 11, 2022, Arena Pharmaceuticals operates as a subsidiary of Pfizer Inc. Therefore, ARNA stock is no longer publicly traded. The value of Arena's assets and pipeline is now incorporated into Pfizer's overall valuation. Investors interested in Arena's programs would need to consider Pfizer's stock (PFE). While Arena has a negative P/E ratio and profit margin, its potential lies in the successful development and commercialization of its pipeline assets, which are now backed by Pfizer's resources and expertise.

What are the main risks for ARNA?

The main risks associated with Arena Pharmaceuticals, now under Pfizer, primarily revolve around the inherent uncertainties of drug development. Clinical trial failures, regulatory setbacks, and competition from other companies developing similar therapies pose significant risks. High research and development costs can also impact profitability. Additionally, patent expirations could reduce market exclusivity for Arena's drugs. These risks are now absorbed by Pfizer, which has the financial strength to mitigate some of these challenges.

What are the key factors to evaluate for ARNA?

Arena Pharmaceuticals, Inc. (ARNA) currently holds an AI score of 53/100, indicating moderate score. Key strength: Diverse pipeline of clinical programs.. Primary risk to monitor: Potential: Clinical trial failures could delay or halt drug development.. This is not financial advice.

How frequently does ARNA data refresh on this page?

ARNA prices update in real time during U.S. market hours (9:30 AM-4:00 PM ET, weekdays). Fundamentals refresh after quarterly or annual filings. Analyst ratings and AI insights update daily. News is aggregated continuously from financial sources.

What has driven ARNA's recent stock price performance?

Recent price movement in Arena Pharmaceuticals, Inc. (ARNA) can be influenced by earnings results, analyst revisions, sector rotation, and broader market sentiment. Notable catalyst: Diverse pipeline of clinical programs.. Check the News and Technical Analysis tabs for the latest drivers. Past performance does not predict future results.

Should investors consider ARNA overvalued or undervalued right now?

Determining whether Arena Pharmaceuticals, Inc. (ARNA) is overvalued or undervalued requires examining multiple metrics. Compare valuation ratios (P/E, P/S, EV/EBITDA) against sector peers for a comprehensive view.

What research should beginners do before buying ARNA?

Before investing in Arena Pharmaceuticals, Inc. (ARNA), research these four areas: (1) the company's revenue model and competitive position (see Company Overview), (2) financial health through revenue growth, margins, and cash flow (see MoonshotScore), (3) what Wall Street analysts recommend and their price targets (see Analyst tab), and (4) specific risk factors that could impact the stock (see Risk Factors section).

Disclaimer: This content is for informational purposes only and does not constitute investment advice. Always do your own research and consult a financial advisor.

Official Resources

Analysis updated AI Score refreshed daily
Data Sources & Methodology
Market data powered by Financial Modeling Prep & Yahoo Finance. AI analysis by Stock Expert AI proprietary algorithms. Technical indicators via industry-standard calculations. Last updated: .

Data provided for informational purposes only.

Analysis Notes
  • Information based on available data up to March 11, 2022, when Arena Pharmaceuticals became a subsidiary of Pfizer Inc.
Data Sources

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