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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
1166279	P Dominic Behan	C/O Arena Pharmaceuticals, Inc. 6154 Nancy Ridge Drive San Diego CA 92121	Evp & Chief Scientific Officer	Yes	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
Common Stock	Acquisiton	2013-09-10	150,000	$1.49	603,000	No	4	M	Direct
Common Stock	Acquisiton	2013-09-10	50,000	$1.81	653,000	No	4	M	Direct
Common Stock	Disposition	2013-09-10	200,000	$6.31	453,000	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
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	2013-09-10	150,000	$0.00	150,000	$1.49
Common Stock	Employee Stock Option (right to buy)	Disposition	2013-09-10	50,000	$0.00	50,000	$1.81

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
150,000		2021-03-15	No	4	M	Direct
450,000		2022-03-19	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.
This price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $6.26 and $6.34 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 vest in four equal annual installments, and are exercisable once vested. The first and second installments became exercisable on March 15, 2012, and 2013, and the third and fourth installments vest on March 15, 2014, and 2015.
The options vest in four equal annual installments, and are exercisable once vested. The first installment became exercisable on March 19, 2013, and the second, third and fourth installments vest on March 19, 2014, 2015 and 2016.