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UNITED STATES OMB APPROVAL
SECURITIES AND EXCHANGE COMMISSION --------------------------
OMB Number: 3235-0145
WASHINGTON, D.C. 20549 --------------------------
Expires: February 28, 2009
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Estimated average burden
SCHEDULE 13G hours per response...11
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UNDER THE SECURITIES EXCHANGE ACT OF 1934
(AMENDMENT NO. 2)*
Arena Pharmaceuticals, Inc.
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(Name of Issuer)
Common Stock
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(Title of Class of Securities)
040047102
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(CUSIP Number)
12/31/2006
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(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:
/X/ Rule 13d-1(b)
/ / Rule 13d-1(c)
/ / Rule 13d-1(d)
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* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, SEE the
NOTES).
CUSIP No. 040047102
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1. Names of Reporting Persons
I.R.S. Identification No. of above persons (entities only).
The TCW Group, Inc., on behalf of the TCW Business Unit
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2. Check the Appropriate Box if a Member of a Group (See Instructions)
(a) / /
(b) /X/
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3. SEC Use Only
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4. Citizenship or Place of Organization
Nevada corporation
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Number of Shares 5. Sole Voting Power
Beneficially Owned by
Each Reporting Person -0-
With ----------------------------------------------------
6. Shared Voting Power
2,043,092
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7. Sole Dispositive Power
-0-
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8. Shared Dispositive Power
4,150,892
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9. Aggregate Amount Beneficially Owned by Each Reporting Person
4,150,892
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10. Check box if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions) / /
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11. Percent of Class Represented by Amount in Row (9)
7.0% (see response to Item 4)
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12. Type of Reporting Person (See Instructions)
HC/CO
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Item 1(a). Name of Issuer:
Arena Pharmaceuticals, Inc.
Item 1(b). Address of Issuer's Principal Executive Offices:
6166 Nancy Ridge Drive
San Diego, CA 92121
Item 2(a). Name of Persons Filing:
Item 2(b). Address of Principal Business Office, or if None, Residence:
Item 2(c). Citizenship:
The TCW Group, Inc., on behalf of the TCW Business Unit
865 South Figueroa Street
Los Angeles, CA 90017
(Nevada Corporation)
Item 2(d). Title of Class of Securities:
Common Stock
Item 2(e). CUSIP Number:
040047102
Item 3. If This Statement Is Filed Pursuant to Sections 240.13d-1(b), or
240.13d-2(b) or (c), Check Whether the Person Filing is a:
(a) / / Broker or dealer registered under Section 15 of the Exchange
Act (15 U.S.C. 78o).
(b) / / Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).
(c) / / Insurance company as defined in Section 3(a)(19) of the Exchange
Act (15 U.S.C. 78c).
(d) / / Investment company registered under Section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) / / An investment adviser in accordance with
Section 240.13d-1(b)(1)(ii)(E).
(f) / / An employee benefit plan or endowment fund in accordance with
Section 240.13d-1(b)(1)(ii)(F).
(g) /X/ A parent holding company or control person in accordance with
Section 240.13d-1(b)(1)(ii)(G).
(SEE Item 7)
The TCW Group, Inc., on behalf of the TCW Business Unit
(h) / / A savings association as defined in Section 3(b) of the Federal
Deposit Insurance Act (12 U.S.C. 1813);
(i) / / A church plan that is excluded from the definition of an
investment company under Section 3(c)(14) of the Investment
Company Act of 1940 (15 U.S.C. 80a-3);
(j) / / Group, in accordance with Section 240.13d-1(b)(1)(ii)(J).
If this statement is filed pursuant to Rule 13d-1(c), check this box. / /
Item 4. Ownership**
The TCW Group, Inc., on behalf of the Business Unit ***
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(a) Amount beneficially owned: 4,150,892
(b) Percent of class: 7.0%
(c) Number of shares as to which such person has:
(i) Sole power to vote or to direct the vote: none.
(ii) Shared power to vote or to direct the vote: 2,043,092
(iii) Sole power to dispose or to direct the disposition of: none.
(iv) Shared power to dispose or to direct the disposition of: 4,150,892
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** The filing of this Schedule 13G shall not be construed as an admission that
the reporting person or any of its affiliates is, for the purposes of
Section 13(d) or 13(g) of the Securities Exchange Act of 1934, the
beneficial owner of any securities covered by this Schedule 13G. In
addition, the filing of this Schedule 13G shall not be construed as an
admission that the reporting person or any of its affiliates is the
beneficial owner of any securities covered by this Schedule 13G for any
other purposes than Section 13(d) of the Securities Exchange Act of 1934.
*** See Exhibit A
Item 5. Ownership of Five Percent or Less of a Class.
If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more
than five percent of the class of securities, check the following / /.
Item 6. Ownership of More than Five Percent on Behalf of Another Person.
Various persons other than as described in Item 4 have the right to receive
or the power to direct the receipt of dividends from, or the proceeds from
the sale of, the Common Stock of Arena Pharmaceuticals, Inc.
Item 7. Identification and Classification of the Subsidiary Which Acquired the
Security Being Reported on by the Parent Holding Company.
SEE Exhibit A.
Item 8. Identification and Classification of Members of the Group.
Not applicable. SEE Exhibit A.
Item 9. Notice of Dissolution of Group.
Not applicable.
Item 10. Certification.
Because this statement is filed pursuant to Rule 13d-1(b), the following
certification is included:
By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were acquired in the ordinary course of
business and were not acquired and are not held for the purpose of or with
the effect of changing or influencing the control of the issuer of the
securities and were not acquired and are not held in connection with or as
a participant in any transaction having that purpose or effect.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Dated this 9th day of February, 2007.
The TCW Group, Inc., on behalf of the
TCW Business Unit
By: /s/ Linda D. Barker
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Linda D. Barker
Authorized Signatory
EXHIBIT A
RELEVANT SUBSIDIARIES OF PARENT HOLDING COMPANY
PART A: TCW ENTITIES
PARENT HOLDING COMPANY:
The TCW Group, Inc.
RELEVANT SUBSIDIARIES THAT ARE PERSONS DESCRIBED IN RULE 13d-1(b):
(i) Trust Company of the West, a California corporation and a bank as
defined in Section 3(a)(6) of the Securities Exchange Act of 1934.
(ii) TCW Asset Management Company, a California corporation and an
Investment Adviser registered under Section 203 of the Investment
Advisers Act of 1940.
(iii) TCW Investment Management Company, a California corporation and an
Investment Adviser registered under Section 203 of the Investment
Advisers Act of 1940.
(iv) TCW Capital Investment Corporation, a California corporation.
This Schedule 13G is being filed by the TCW Group, Inc., a Nevada corporation
("TCW"), on behalf of itself and its direct and indirect subsidiaries, which
collectively constitute The TCW Group, Inc. business unit (the "TCW Business
Unit" or the "Reporting Person"). The TCW Business Unit is primarily engaged
in the provision of investment management services.
As of July 6, 2001, the ultimate parent company of TCW is Societe Generale,
S.A., a corporation formed under the laws of France ("SG"). The principal
business of SG is acting as a holding company for a global financial services
group, which includes certain distinct specialized business units that are
independently operated, including the TCW Business Unit.
SG, for purpose of the federal securities laws, may be deemed ultimately to
control TCW and the TCW Business Unit. SG, its executive officers and
directors, and its direct and indirect subsidiaries (including all business
units except the TCW Business Unit), may beneficially own shares of the
securities of the issuer to which this schedule relates (the "Shares") and such
shares are not reported in this statement. In accordance with Securities and
Exchange Commission ("SEC") Release No. 34-39538 (January 12, 1998), and due to
the separate management and independent operation of its business units, SG
disclaims beneficial ownership of Shares beneficially owned by the Reporting
Person. The Reporting Person disclaims beneficial ownership of Shares
beneficially owned by SG and any of SG's other business units.