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* ROSENWALD LINDSAY A MD (Last) (First) (Middle) 787 SEVENTH AVENUE, 48TH FLOOR (Street) NEW YORK, NY 10019 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 09/13/2005	3. Issuer Name and Ticker or Trading Symbol ZIOPHARM ONCOLOGY INC [ ESWB ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	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	476,678	D
Common Stock	737,777	I	Owned by individuals and pledged to Lindsay A. Rosenwald, M.D. to secure certain obligations(1)

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)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Warrants	05/31/2005	05/31/2012	Common Stock	221,011	4.75	D
Warrants	12/23/2004	12/23/2011	Common Stock	62,621	4.75	I	Owned by Paramount Biocapital Investments, LLC(2)

Explanation of Responses:

1. These Shares are held by certain individuals and pledged to Dr. Rosenwald pursuant to pledge agreements to secure certain obligations. Dr. Rosenwald disclaims beneficial ownership of these Shares, except to the extent of his pecuniary interest therein, if any.

2. These Warrants are held by Paramount Biocapital Investments, LLC, of which Dr. Rosenwald is managing member. Dr. Rosenwald disclaims beneficial ownership of these Warrants, except to the extent of his pecuniary interest therein, if any.

	/s/ Lindsay A. Rosenwald, M.D.	09/22/2005
	** 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).
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