SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Bielasz Jennifer Kathleen

(Last)

(First)

(Middle)

C/O ARENA PHARMACEUTICALS, INC.

6166 NANCY RIDGE DRIVE

(Street)

SAN DIEGO

92121

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
03/15/2011

3. Issuer Name and Ticker or Trading Symbol
ARENA PHARMACEUTICALS INC [ ARNA ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Sr. Dir. of Accounting & Cont.

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	7,666	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Employee Stock Option (right to buy)	⁽¹⁾	01/15/2012	Common Stock	2,500	$12.25	D
Employee Stock Option (right to buy)	⁽²⁾	07/19/2012	Common Stock	5,000	$11.31	D
Employee Stock Option (right to buy)	⁽³⁾	01/18/2014	Common Stock	5,000	$6	D
Employee Stock Option (right to buy)	⁽⁴⁾	10/08/2014	Common Stock	2,500	$4.41	D
Employee Stock Option (right to buy)	⁽⁵⁾	01/17/2015	Common Stock	4,500	$6.16	D
Employee Stock Option (right to buy)	⁽⁶⁾	01/20/2016	Common Stock	3,000	$16.8	D
Employee Stock Option (right to buy)	⁽⁷⁾	07/28/2016	Common Stock	4,000	$10.52	D
Employee Stock Option (right to buy)	⁽⁸⁾	02/26/2017	Common Stock	6,500	$13.5	D
Employee Stock Option (right to buy)	⁽⁹⁾	03/03/2018	Common Stock	6,000	$6.99	D
Employee Stock Option (right to buy)	⁽¹⁰⁾	03/17/2019	Common Stock	6,000	$4.01	D
Employee Stock Option (right to buy)	⁽¹¹⁾	03/17/2020	Common Stock	9,000	$3.25	D

Explanation of Responses:

1. The options vested in four equal annual installments beginning on January 15, 2003.

2. The options vested in four equal annual installments beginning on July 19, 2003.

3. The options vested in four equal annual installments beginning on June 1, 2004.

4. The options vested in four equal annual installments beginning on October 8, 2005.

5. The options were originally for 6,000 shares of common stock, and they vested in four equal annual installments beginning on June 1, 2005. The holder exercised options to purchase 1,500 shares of common stock.

6. The options vested in four equal annual installments beginning on January 20, 2007.

7. The options vested in four equal annual installments beginning on July 28, 2007

8. The options vested in four equal annual installments beginning on February 26, 2008.

9. The options vest in four equal annual installments, and are exercisable once vested. The first installment became exercisable on March 3, 2009, the second installment became exercisable on March 3, 2010, the third installment became exercisable on March 3, 2011, and the fourth installment vests on March 3, 2012.

10. The options vest in four equal annual installments, and are exercisable once vested. The first installment became exercisable on March 17, 2010, the second installment vests on March 17, 2011, the third installment vests on March 17, 2012, and the fourth installment vests on March 17, 2013.

11. The options vest in four equal annual installments beginning on March 17, 2011, and are exercisable once vested.

Remarks:

	Adam S. Chinnock, as Attorney-in-Fact	03/17/2011
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.