SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
Magnetar Financial LLC

(Last) (First) (Middle)
1603 ORRINGTON AVE.
13TH FLOOR

(Street)
EVANSTON IL 60201

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Opexa Therapeutics, Inc. [ OPXA ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director X 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
06/20/2006
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
X Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 06/20/2006 P 500 A $9.5 672,685 I See Footnote(1)
Common Stock 06/20/2006 P 70 A $9.5 672,755 I See Footnote(1)
Common Stock 06/20/2006 P 60 A $9.5 672,815 I See Footnote(1)
Common Stock 06/26/2006 S 2,000 D $8.5 670,815 I See Footnote(1)
Common Stock 06/26/2006 S 2,500 D $7.55 668,315 I See Footnote(1)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
1. Name and Address of Reporting Person*
Magnetar Financial LLC

(Last) (First) (Middle)
1603 ORRINGTON AVE.
13TH FLOOR

(Street)
EVANSTON IL 60201

(City) (State) (Zip)
1. Name and Address of Reporting Person*
Magnetar Capital Partners LLC

(Last) (First) (Middle)
1603 ORRINGTON AVE.
13TH FLOOR

(Street)
EVANSTON IL 60201

(City) (State) (Zip)
1. Name and Address of Reporting Person*
Supernova Management LLC

(Last) (First) (Middle)
1603 ORRINGTON AVENUE, 13TH FLOOR

(Street)
EVANSTON IL 60201

(City) (State) (Zip)
1. Name and Address of Reporting Person*
Litowitz Alec N

(Last) (First) (Middle)
C/O MAGNETAR FINANCIAL LLC
1603 ORRINGTON AVENUE, 13TH FLOOR

(Street)
EVANSTON IL 60201

(City) (State) (Zip)
Explanation of Responses:
1. These shares of the Issuer's common stock, $.05 par value per share ("Shares), are held for the account of Magnetar Capital Master Fund, Ltd., a Cayman Islands exempted company ("Magnetar Capital Master Fund"). Magnetar Financial LLC, a Delaware limited liability company ("Magnetar Financial"), serves as the Investment Adviser to the Magnetar Capital Master Fund. Magnetar Capital Partners LP, a Delaware limited partnership ("Magnetar Capital Partners"), serves as the sole member and parent holding company of Magnetar Financial. Magnetar Financial is a registered investment adviser under Section 203 of the Investment Advisers Act of 1940, as amended. In such capacity, Magnetar Financial exercises voting and investment power over the Shares held for the account of Magnetar Capital Master Fund. Supernova Management LLC, a Delaware limited liability company ("Supernova"), is the general partner of Magnetar Capital Partners. The manager of Supernova is Mr. Alec N. Litowitz.
By: /s/ Alec N. Litowitz, as Manager of Supernova Management LLC, as General Partner of Magnetar Capital Partners LP, as Sole Member of Magnetar Financial LLC 06/28/2006
By: /s/ Alec N. Litowitz, as Manager of Supernova Management LLC, as General Partner of Magnetar Capital Partners LP 06/28/2006
By: /s/ Alec N. Litowitz, as Manager of Supernova Management LLC 06/28/2006
/s/ Alec N. Litowitz 06/28/2006
** 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 4 (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).
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