UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Information to be included in Statements filed pursuant to Rules
13d-1(b), (c) and (d) and amendments thereto filed pursuant to
Rule 13d-2(b)
(Amendment No. __)
Zonagen, Inc.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
98975L108
(CUSIP Number)
December 31, 2005
(Date of Event That 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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1. Names of Reporting Persons and I.R.S. Identification No.
UBS AG (for the benefit and on behalf of UBS Investment Bank, Wealth
Management USA, and Global Wealth Management and Business Banking business
groups of UBS AG (See Item 7))
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2. Check the Appropriate Box if a Member of a Group a [ ]
b [ ]
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3. SEC USE ONLY
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4. Citizenship or Place of Organization
Switzerland
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5. Sole Voting Power
1,010,718
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Number of 6. Shared Voting Power
Shares
Beneficially 0
Owned by -----------------------------------------------------------------
Each 7. Sole Dispositive Power
Reporting
Person With: 1,010,718
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8. Shared Dispositive Power
0
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9. Aggregate Amount Beneficially Owned by Each Reporting Person:
1,010,718
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10. Check if the Aggregate Amount in Row 9 Excludes Certain Shares [ ]
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11. Percent of Class Represented by Amount in Row 9
10.03%
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12. Type of Reporting Person
BK
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Item 1(a) Name of Issuer
Zonagen, Inc.
Item 1(b) Address of Issuer's Principal Executive Offices:
2408 Timberloch Place
Suite B-1
The Woodlands, TX 77380
Item 2(a) Name of Person Filing:
UBS AG
Item 2(b) Address of Principal Business Office:
UBS AG's principal business office is:
Bahnhofstrasse 45
PO Box CH-8021
Zurich, Switzerland
Item 2(c) Citizenship:
Switzerland
Item 2(d) Title of Class of Securities
Common Stock
Item 2(e) CUSIP Number:
98975L108
Item 3. Type of Person Filing:
UBS AG is classified as a Bank as defined in section 3(a)(6) of the Act pursuant
to no-action relief granted by the staff of the Securities and Exchange
Commission.
Item 4 (a)-(c)(iv). Ownership:
Items 5-11 of the cover pages are incorporated by reference.
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:
Not applicable
Item 7. Identification and Classification of the Subsidiary That Acquired the
Security Being Reported on By the Parent Holding Company:
This statement on Schedule 13G is being filed by UBS AG on behalf of itself and
the subsidiaries listed below. The securities being reported on by UBS AG were
acquired directly by UBS AG directly and certain of such subsidiaries.
UBS AG London Branch
UBS Portfolio LLC
UBS AG Frankfurt
UBS Ltd
UBS Warburg Private Clients Ltd
UBS AG Tokyo branch
UBS AG (Switzerland)
UBS Warburg Securities (Pty) Ltd (South Africa)
UBS International Ltd
UBS Warburg Securities Ltd
Banco UBS Warburg S.A
UBS Warburg Corretora de Cambio e Valores
Mobiliarios S.A.
UBS Warburg Trading S.A.
UBS Bunting Warburg Inc
UBS Capital Americas Investments III, Ltd.
UBS Capital II LLC
UBS Capital LLC
UBS AG Brazil
UBS Limited
UBS Capital Americas Investments II Ltd
SBC Equity Partners AG
UBS Capital Asia Pacific Ltd
UBS Capital Holdings LLC
UBS Capital Jersey Ltd
UBS Capital BV
UBS (USA) Inc
UBS Warburg AG (Frankfurt)
UBS Securities Australia Ltd
UBS Securities (Japan) Ltd
UBS Securities LLC
UBS Securities New Zealand Limited
UBS New Zealand Limited
UBS AG Australia Branch
UBS Capital Markets LP
UBS Capital Latin America LDC
UBS Securities France SA
UBS AG Canada Branch
UBS Cayman Ltd.
PaineWebber Capital Inc
Paine Webber International Inc
UBS Fiduciary Trust Company
UBS Financial Services Incorporated of Puerto Rico
UBS Americas Inc
UBS Financial Services Inc.
Inversiones Ibersuizas, S.A.
UBS (Bahamas) LTD
UBS (Cayman Islands) LTD
UBS (France) LTD
UBS (Italia) LTD
UBS (Luxemberg) LTD
UBS (Luxemberg) SA Austria Branch
UBS (Monaco) S.A.
UBS AG Brazil
UBS AG New York (101 Park Avenue)
UBS AG Hong Kong
UBS AG Jersey Branch
UBS AG Singapore
UBS Assessores LTD
UBS Bank (Canada)
UBS Belgium SA/NV
UBS Deutschland AG
UBS Espana S.A.
UBS International Inc
UBS Swiss Advisors AG
UBS Wealth Management AG
UBS Wealth Management (UK) Ltd
Item 8. Identification and Classification of Members of the Group
Not Applicable
Item 9 Notice of Dissolution of Group:
Not Applicable
Item 10. Certification:
By signing below, the undersigned certify that, to the best of their knowledge
and belief, the securities referred to above were acquired and are held 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.
By: /s/ Per Dyrvik
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Per Dyrvik
Managing Director
By: /s/ Teresa Ressel
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Teresa Ressel
Managing Director
Date: February 10, 2006