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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1080709	Arena Pharmaceuticals Inc	ARNA	Pharmaceutical Preparations (2834)	232908305

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1166288	Robert Hoffman	C/O Arena Pharmaceuticals, Inc. 6166 Nancy Ridge Drive San Diego CA 92121	Svp, Finance And Cfo	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2012-10-01	50,000	$1.48	53,382	No	4	M	Direct
Common Stock	Disposition	2012-10-01	50,000	$8.32	3,382	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (right to buy)	Disposition	2012-10-01	50,000	$0.00	50,000	$1.48

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
150,000		2021-09-15	No	4	M	Direct

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.26 and $8.35 per share, inclusive. The reporting person undertakes to provide Arena Pharmaceuticals, Inc., any security holder of Arena Pharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
The options, representing a right to purchase a total of 200,000 shares, vest in four equal annual installments, and are exercisable once vested. The first installment became exercisable on September 15, 2012, and the second, third and fourth installments vest on September 15, 2013, 2014 and 2015.