Ownership Submission
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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Blackstone Holdings I L.P.
2. Date of Event Requiring Statement (Month/Day/Year)
04/09/2014
3. Issuer Name and Ticker or Trading Symbol
RENTECH, INC. [RTK]
(Last)
(First)
(Middle)
C/O THE BLACKSTONE GROUP, 345 PARK AVENUE
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 Original Filed(Month/Day/Year)
(Street)

NEW YORK, NY 10154
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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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 of Derivative Security: 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
Series E Convertible Preferred Stock   (1)(2)   (1)(2) Common Stock 4,452,839.7748 (1) (2) $ 2.22 (1) (2) I See Footnotes (3) (12) (13) (14) (15) (16) (17)
Series E Convertible Preferred Stock   (1)(2)   (1)(2) Common Stock 1,729,862.973 (1) (2) $ 2.22 (1) (2) I See Footnotes (4) (12) (13) (14) (15) (16) (17)
Series E Convertible Preferred Stock   (1)(2)   (1)(2) Common Stock 1,731,139.8198 (1) (2) $ 2.22 (1) (2) I See Footnotes (5) (12) (13) (14) (15) (16) (17)
Series E Convertible Preferred Stock   (1)(2)   (1)(2) Common Stock 5,852,021.2162 (1) (2) $ 2.22 (1) (2) I See Footnotes (6) (12) (13) (14) (15) (16) (17)
Series E Convertible Preferred Stock   (1)(2)   (1)(2) Common Stock 3,003,003.018 (1) (2) $ 2.22 (1) (2) I See Footnotes (7) (11) (13) (14) (15) (16) (17)
Series E Convertible Preferred Stock   (1)(2)   (1)(2) Common Stock 7,262,045.7207 (1) (2) $ 2.22 (1) (2) I See Footnotes (8) (11) (13) (14) (15) (16) (17)
Series E Convertible Preferred Stock   (1)(2)   (1)(2) Common Stock 12,951,069.4595 (1) (2) $ 2.22 (1) (2) I See Footnotes (9) (12) (13) (14) (15) (16) (17)
Series E Convertible Preferred Stock   (1)(2)   (1)(2) Common Stock 8,063,063.0631 (1) (2) $ 2.22 (1) (2) I See Footnotes (10) (12) (13) (14) (15) (16) (17)

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Blackstone Holdings I L.P.
C/O THE BLACKSTONE GROUP
345 PARK AVENUE
NEW YORK, NY 10154
    X    
GSO CAPITAL PARTNERS LP
345 PARK AVENUE
NEW YORK, NY 10154
    X    
GSO Advisor Holdings L.L.C.
C/O GSO CAPITAL PARTNERS LP
345 PARK AVENUE
NEW YORK, NY 10154
    X    
GSO Holdings I LLC
C/O GSO CAPITAL PARTNERS LP
345 PARK AVENUE
NEW YORK, NY 10154
    X    
Blackstone Holdings I/II GP Inc
C/O THE BLACKSTONE GROUP
345 PARK AVENUE
NEW YORK, NY 10154
    X    
Blackstone Group L.P.
345 PARK AVENUE
NEW YORK, NY 10154
    X    
Blackstone Group Management L.L.C.
345 PARK AVENUE
NEW YORK, NY 10154
    X    
SCHWARZMAN STEPHEN A
C/O THE BLACKSTONE GROUP
345 PARK AVE
NEW YORK, NY 10154
    X    
Goodman Bennett J
C/O GSO CAPITAL PARTNERS LP
345 PARK AVENUE
NEW YORK, NY 10154
    X    
Smith J Albert III
C/O GSO CAPITAL PARTNERS LP
345 PARK AVENUE
NEW YORK, NY 10154
    X    

Signatures

GSO Capital Partners LP, By: /s/ Marisa Beeney, Name: Marisa Beeney, Title: Authorized Signatory 04/21/2014
**Signature of Reporting Person Date

GSO Advisor Holdings L.L.C., By: Blackstone Holdings I L.P., its sole member, By: Blackstone Holdings I/II GP Inc., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 04/21/2014
**Signature of Reporting Person Date

GSO Holdings I LLC, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 04/21/2014
**Signature of Reporting Person Date

Blackstone Holdings I L.P., By: Blackstone Holdings I/II GP Inc., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 04/21/2014
**Signature of Reporting Person Date

Blackstone Holdings I/II GP Inc., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 04/21/2014
**Signature of Reporting Person Date

The Blackstone Group L.P., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 04/21/2014
**Signature of Reporting Person Date

Blackstone Group Management L.L.C., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 04/21/2014
**Signature of Reporting Person Date

Stephen A. Schwarzman, By: /s/ Stephen A. Schwarzman, Name: Stephen A. Schwarzman 04/21/2014
**Signature of Reporting Person Date

Bennett J. Goodman, By: /s/ Marisa Beeney, Name: Marisa Beeney, Title: Attorney-in-Fact 04/21/2014
**Signature of Reporting Person Date

J. Albert Smith III, By: /s/ Marisa Beeney, Name: Marisa Beeney, Title: Attorney-in-Fact 04/21/2014
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) The number of shares of Common Stock, par value $0.01 per share (the "Common Stock") of Rentech, Inc. (the "Issuer") issuable upon conversion of Series E Convertible Preferred Stock, par value $10.00 per share (the "Series E Convertible Preferred Stock") of the Issuer is equal to the quotient of (i) the original issue price of $1,000 per share of each such share of Series E Preferred Stock divided by (ii) $2.22, subject to adjustments in the event of a stock split, stock or securities dividend, combination, recapitalization or certain other customary adjustments, with any fractional shares paid in cash. However, no more than an aggregate of 45,045,045 shares of Common Stock can be issued upon such conversion, subject to appropriate adjustment in the event of a stock split, stock dividend, combination or other similar recapitalization. The Series E Convertible Preferred Stock are convertible at any time, and have no expiration date.
(2) (Continued from footnote 1) The Issuer may convert all, but not less than all, of the outstanding shares of Series E Preferred Stock to Common Stock at any time after the second anniversary of the original issue date of April 9, 2014, if certain conditions are met.
(3) GSO Cactus Credit Opportunities Fund LP directly holds these securities.
(4) Steamboat Credit Opportunities Master Fund LP directly holds these securities.
(5) GSO Coastline Credit Partners LP directly holds these securities.
(6) GSO Aiguille des Grands Montets Fund II LP directly holds these securities.
(7) GSO Palmetto Opportunistic Investment Partners LP directly holds these securities. GSO Palmetto Opportunistic Associates LLC is the general partner of GSO Palmetto Opportunistic Investment Partners LP.
(8) GSO Credit-A Partners LP directly holds these securities. GSO Credit-A Associates LLC is the general partner of GSO Credit-A Partners LP.
(9) GSO Special Situations Fund LP directly holds these securities.
(10) GSO Special Situations Overseas Master Fund Ltd directly holds these securities (GSO Special Situations Overseas Master Fund Ltd, together with GSO Cactus Credit Opportunities Fund LP, Steamboat Credit Opportunities Master Fund LP, GSO Coastline Credit Partners LP, GSO Aiguille des Grands Montets Fund II LP, GSO Palmetto Opportunistic Investment Partners LP, GSO Credit-A Partners LP and GSO Special Situations Fund LP, the "GSO Funds").
(11) GSO Holdings I L.L.C. is the managing member of each of GSO Palmetto Opportunistic Associates LLC and GSO Credit-A Associates LLC.
(12) GSO Capital Partners LP serves as the investment manager of each of GSO Cactus Credit Opportunities Fund LP, Steamboat Credit Opportunities Master Fund LP, GSO Coastline Credit Partners LP, GSO Aiguille des Grands Montets Fund II LP, GSO Special Situations Fund LP and GSO Special Situations Overseas Master Fund Ltd. GSO Advisor Holdings L.L.C. is the general partner of GSO Capital Partners LP.
(13) Blackstone Holdings I L.P. is the sole member of each of GSO Holdings I L.L.C. and GSO Advisor Holdings L.L.C. Blackstone Holdings I/II GP Inc. is the general partner of Blackstone Holdings I L.P. The Blackstone Group L.P. is the controlling shareholder of Blackstone Holdings I/II GP Inc. Blackstone Group Management L.L.C. is the general partner of The Blackstone Group L.P. Blackstone Group Management L.L.C. is wholly-owned by Blackstone's senior managing directors and controlled by its founder, Stephen A. Schwarzman.
(14) In addition, each of Bennett J. Goodman, J. Albert Smith III and Douglas I. Ostrover may be deemed to have shared voting power and/or investment power with respect to the securities held by the GSO Funds. Mr. Ostrover is a member of the board of directors of the Issuer.
(15) Due to the limitations of the electronic filing system, GSO Cactus Credit Opportunities Fund LP, Steamboat Credit Opportunities Master Fund LP, GSO Coastline Credit Partners LP, GSO Aiguille des Grands Montets Fund II LP, GSO Palmetto Opportunistic Investment Partners LP, GSO Credit-A Partners LP, GSO Special Situations Fund LP, GSO Special Situations Overseas Master Fund Ltd, GSO Palmetto Opportunistic Associates LLC, GSO Credit-A Associates LLC and Douglas I. Ostrover are filing separate Forms 3.
(16) Information with respect to each of the Reporting Persons is given solely by such Reporting Person, and no Reporting Person has responsibility for the accuracy or completeness of information supplied by another Reporting Person.
(17) Each of the Reporting Persons (other than each of GSO Funds to the extent they directly hold securities reported herein), disclaims beneficial ownership of the securities held by each of the GSO Funds, except to the extent of such Reporting Person's pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, each of the Reporting Persons (other than each of the GSO Funds to the extent they directly hold securities reported herein) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.
 
Remarks:
Exhibit 24.1 - Power of Attorney -Bennett J. Goodman (incorporated by reference from Exhibit B to the Schedule 13D filed by the Reporting Persons on April 21, 2014). Exhibit 24.2 - Power of Attorney - J. Albert Smith III (incorporated by reference from Exhibit C to the Schedule 13D filed by the Reporting Persons on April 21, 2014).

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