ARNA on NASDAQ

Arena Pharmaceuticals

Logo: Arena Pharmaceuticals, Public domain, via Wikimedia Commons4

American healthcare company

Arena Pharmaceuticals, Inc. is an American biopharmaceutical company founded in 1997 and headquartered in San Diego, California.3 From Wikipedia, CC BY-SA 4.0

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Last updated Oct 16, 2026.

Overview

1997Founded1

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  • TickerARNA on NASDAQ1
  • Industrypharmaceutical industry1
  • HeadquartersSan Diego1
  • Websitewww.arenapharm.com
  • Incorporated inDE5
  • Business address6154 Nancy Ridge Drive, San Diego, Ca 921215
  • Filer categoryLarge accelerated filer5

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Arena Pharmaceuticals, Inc. is an American biopharmaceutical company founded in 1997 and headquartered in San Diego, California. The company has small molecule drugs in development for possible clinical utility in multiple therapeutic areas. The company's most advanced investigational clinical programs are ralinepag (formerly APD811) in testing for pulmonary arterial hypertension (PAH), etrasimod (formerly APD334) in evaluation for inflammatory indications and APD371 for the treatment of pain associated with Crohn's disease. In 2016, the company downsized and shifted its focus to developing new drugs currently being tested in clinical trials. In December 2021, Pfizer announced that it had agreed to acquire Arena for $6.7 billion in cash. In March 2022, it was announced the acquisition by Pfizer had been concluded.3

Financials

From the company’s reports to the SEC. Every number links to the filing it came from.

Key numbers, fiscal 2021

-1156109.3%Operating margin6
-1141542.6%Net margin6
-83.1%Revenue growth, 20216
-91.6%Return on equity6
-$453.0MFree cash flow6

Where the money goes

Where each dollar of revenue went, fiscal 2021

  • Selling, general and admin97¢$126.2M
  • Interest3¢$4.2M

Out of $54.0K in revenue.6 The company lost money this year.

Financial statements

Revenue789106$54.0K in 2021−100% since 2015
0$250.0M$500.0M$750.0M$1.0B2015: $13.4M$13.4M20152016: $92.2M$92.2M2016+588%2017: $21.3M$21.3M2017−77%2018: $18.0M$18.0M2018−16%2019: $806.4M$806.4M2019+4388%2020: $319.0K$319.0K2020−100%2021: $54.0K$54.0K2021−83%
Operating income789106-$624.3M in 2021+503% since 2015
-$1.0B-$500.0M0$500.0M2015: -$103.5M-$103.5M20152016: -$5.3M-$5.3M2016−95%2017: -$92.0M-$92.0M2017+1647%2018: -$144.8M-$144.8M2018+57%2019: $482.7M$482.7M20192020: -$426.6M-$426.6M20202021: -$624.3M-$624.3M2021+46%
Net income789106-$616.4M in 2021+471% since 2015
-$1.0B-$500.0M0$500.0M2015: -$108.0M-$108.0M20152016: -$22.5M-$22.5M2016−79%2017: -$91.4M-$91.4M2017+306%2018: -$29.4M-$29.4M2018−68%2019: $397.6M$397.6M20192020: -$404.7M-$404.7M20202021: -$616.4M-$616.4M2021+52%
Fiscal year2015201620172018201920202021
Revenue$13.4M7$92.2M8$21.3M9$18.0M10$806.4M6$319.0K6$54.0K6
Cost of revenue$8.6M11$9.3M11
Research and development$83.3M7$63.8M8$71.0M9$115.0M10$231.5M10$323.7M10
Selling, general and admin$45.3M10$77.6M6$103.2M6$126.2M6
Operating income-$103.5M7-$5.3M8-$92.0M9-$144.8M10$482.7M6-$426.6M6-$624.3M6
Interest$6.8M7$6.5M8$6.1M9$5.7M10$4.8M6$4.5M6$4.2M6
Income tax$07$08$09-$110.3M10$110.3M6$06$06
Net income-$108.0M7-$22.5M8-$91.4M9-$29.4M10$397.6M6-$404.7M6-$616.4M6
Earnings per share-$0.4511-$0.0911-$2.779-$0.6310$7.996-$7.396-$10.146
Earnings per share (diluted)-$0.4511-$0.0911-$2.779-$0.6310$7.696-$7.396-$10.146

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How it started

History

Arena Pharmaceuticals Inc. is an American biopharmaceutical company founded in 1997 and headquartered in San Diego, California. Arena focused on discovering drugs that act on G protein-coupled receptors (GPCRs). The company developed technology it called Constitutively Activated Receptor Technology (CART) that identified drug leads targeting GPCRs and other classes of receptors. CART was used to identify drug leads able to act as receptor inhibitors to decrease a biological response or act as receptor activators to increase a biological response.

In January 2000, Arena entered into a collaborative agreement with Fujisawa Pharmaceutical Co. Ltd. to validate up to 13 drug targets.

In April 2000, Arena entered into a research collaboration with Eli Lilly and Company focused on the endocrine and central nervous systems.

In May 2000, Arena entered into a research collaboration with Taisho Pharmaceutical Co. focused on several GPCRs selected by Taisho in therapeutic areas of interest.

From Wikipedia’s article on Arena Pharmaceuticals, shared under CC BY-SA 4.0.3

Timeline

  1. 1997Founded Founded1

Recent filings

  1. Mar 11, 20228-K
  2. Mar 11, 20224
  3. Mar 11, 20224
  4. Mar 11, 20224
  5. Mar 11, 20224
  6. Mar 11, 20224
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  11. Mar 11, 20224
  12. Mar 11, 20224
  13. Mar 11, 20224
  14. Mar 11, 20224
  15. Mar 11, 20224

Every filing from the last three years, summarized. The full record is on SEC EDGAR.2

Sources

The numbers on this page point here. Each one links to the record it came from.

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