Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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. Issuer Name and Ticker or Trading Symbol
RENTECH, INC. [RTK]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O THE BLACKSTONE GROUP,, 345 PARK AVENUE
3. Date of Earliest Transaction (Month/Day/Year)
02/12/2015
(Street)

NEW YORK, NY 10154
4. If Amendment, Date 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
(City)
(State)
(Zip)
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

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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 Underlying Securities
(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 of Derivative Security: 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
Call Right (Obligation to Sell) (1) (2) 02/12/2015   J(1)(2)     9,885.3043 02/12/2015   (1)(2) Common Stock (2) (3) 4,452,839.77 (1) (2) 9,885.3043 I See Footnotes (5) (14) (15) (16) (17) (18) (19)
Call Right(Obligation to Buy) (1) (2) 02/12/2015   J(1)(2)   4,452,839.77   02/12/2015   (1)(2) Common Stock (2) (4) 4,452,839.77 (1) (2) 4,452,839.77 I See Footnotes (5) (14) (15) (16) (17) (18) (19)
Call Right (Obligation to Sell) (1) (2) 02/12/2015   J(1)(2)     3,840.2958 02/12/2015   (1)(2) Common Stock (2) (3) 1,729,862.97 (1) (2) 3,840.2958 I See Footnotes (6) (14) (15) (16) (17) (18) (19)
Call Right(Obligation to Buy) (1) (2) 02/12/2015   J(1)(2)   1,729,862.97   02/12/2015   (1)(2) Common Stock (2) (4) 1,729,862.97 (1) (2) 1,729,862.97 I See Footnotes (6) (14) (15) (16) (17) (18) (19)
Call Right (Obligation to Sell) (1) (2) 02/12/2015   J(1)(2)     3,843.1304 02/12/2015   (1)(2) Common Stock (2) (3) 1,731,139.82 (1) (2) 3,843.1304 I See Footnotes (7) (14) (15) (16) (17) (18) (19)
Call Right (Obligation to Buy) (1) (2) 02/12/2015   J(1)(2)   1,731,139.82   02/12/2015   (1)(2) Common Stock (2) (4) 1,731,139.82 (1) (2) 1,731,139.82 I See Footnotes (7) (14) (15) (16) (17) (18) (19)
Call Right (Obligation to Sell) (1) (2) 02/12/2015   J(1)(2)     12,991.4871 02/12/2015   (1)(2) Common Stock (2) (3) 5,852,021.22 (1) (2) 12,991.4871 I See Footnotes (8) (14) (15) (16) (17) (18) (19)
Call Right (Obligation to Buy) (1) (2) 02/12/2015   J(1)(2)   5,852,021.22   02/12/2015   (1)(2) Common Stock (2) (4) 5,852,021.22 (1) (2) 5,852,021.22 I See Footnotes (8) (14) (15) (16) (17) (18) (19)
Call Right (Obligation to Sell) (1) (2) 02/12/2015   J(1)(2)     6,666.6667 02/12/2015   (1)(2) Common Stock (2) (3) 3,003,003.02 (1) (2) 6,666.6667 I See Footnotes (9) (13) (15) (16) (17) (18) (19)
Call Right (Obligation to Buy) (1) (2) 02/12/2015   J(1)(2)   3,003,003.02   02/12/2015   (1)(2) Common Stock (2) (4) 3,003,003.02 (1) (2) 3,003,003.02 I See Footnotes (9) (13) (15) (16) (17) (18) (19)
Call Right (Obligation to Sell) (1) (2) 02/12/2015   J(1)(2)     16,121.7415 02/12/2015   (1)(2) Common Stock (2) (3) 7,262,045.72 (1) (2) 16,121.7415 I See Footnotes (10) (13) (15) (16) (17) (18) (19)
Call Right (Obligation to Buy) (1) (2) 02/12/2015   J(1)(2)   7,262,045.72   02/12/2015   (1)(2) Common Stock (2) (4) 7,262,045.72 (1) (2) 7,262,045.72 I See Footnotes (10) (13) (15) (16) (17) (18) (19)
Call Right (Obligation to Sell) (1) (2) 02/12/2015   J(1)(2)     28,751.3742 02/12/2015   (1)(2) Common Stock (2) (3) 12,951,069.46 (1) (2) 28,751.3742 I See Footnotes (11) (14) (15) (16) (17) (18) (19)
Put Right (Obligation to Buy) (1) (2) 02/12/2015   J(1)(2)   12,951,069.46   02/12/2015   (1)(2) Common Stock (2) (4) 12,951,069.46 (1) (2) 12,951,069.46 I See Footnotes (11) (14) (15) (16) (17) (18) (19)
Call Right (Obligation to Sell) (1) (2) 02/12/2015   J(1)(2)     17,900 02/12/2015   (1)(2) Common Stock (2) (3) 8,063,063.06 (1) (2) 17,900 I See Footnotes (12) (14) (15) (16) (17) (18) (19)
Put Right (Obligation to Buy) (1) (2) 02/12/2015   J(1)(2)   8,063,063.06   02/12/2015   (1)(2) Common Stock (2) (4) 8,063,063.06 (1) (2) 8,063,063.06 I See Footnotes (12) (14) (15) (16) (17) (18) (19)

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 THE BLACKSTONE GROUP
345 PARK AVENUE
NEW YORK, NY 10154
    X    
GSO Holdings I LLC
C/O THE BLACKSTONE GROUP
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.
C/O THE BLACKSTONE GROUP
345 PARK AVENUE
NEW YORK, NY 10154
    X    
SCHWARZMAN STEPHEN A
C/O THE BLACKSTONE GROUP
345 PARK AVENUE
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   02/25/2015
**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   02/25/2015
**Signature of Reporting Person Date

 GSO Holdings I LLC, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer   02/25/2015
**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   02/25/2015
**Signature of Reporting Person Date

 Blackstone Holdings I/II GP Inc., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer   02/25/2015
**Signature of Reporting Person Date

 The Blackstone Group L.P., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer   02/25/2015
**Signature of Reporting Person Date

 Blackstone Group Management L.L.C., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer   02/25/2015
**Signature of Reporting Person Date

 Mr. Stephen A. Schwarzman, By: /s/ Stephen A. Schwarzman, Name: Stephen A. Schwarzman   02/25/2015
**Signature of Reporting Person Date

 Bennett J. Goodman, By: /s/ Marisa Beeney, Name: Marisa Beeney, Title: Attorney-in-Fact   02/25/2015
**Signature of Reporting Person Date

 J. Albert Smith III, By: /s/ Marisa Beeney, Name: Marisa Beeney, Title: Attorney-in-Fact   02/25/2015
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) On April 9, 2014, the Issuer, GSO Capital Partners LP and the GSO Funds (as defined below) entered into a Subscription Agreement (the "Subscription Agreement") to purchase Series E Convertible Preferred Stock of the Issuer (the "Purchased Shares"). On February 12, 2015, in connection with the amendment of other transaction documents related to the Subscription Agreement, the above mentioned parties entered into Amendment No. 1 to the Subscription Agreement (the Subscription Agreement, as so amended, the "Amended Subscription Agreement"). Pursuant to Amendment No. 1, the Amended Subscription Agreement provides that, subject to certain conditions, at any time after February 12, 2015, in the Issuer's sole discretion, the Issuer has the right to purchase all, but not less than all, of the Purchased Shares from the purchasers.
(2) Upon exercise of its call right described in Footnote 1 above, the Issuer shall purchase the Purchased Shares in exchange for (a) $1,000 in cash per Purchased Share (as adjusted for any stock splits, stock dividends, recapitalizations or the like), plus any accrued and unpaid dividends thereon and (b) warrants exercisable for the number of shares of the Issuer's common stock ("Common Stock") equal to the number of shares of Common Stock into which such purchaser's Purchased Shares are then convertible ("Repurchase Warrants"). If issued, the Repurchase Warrants will have an exercise price equal to the conversion price of the Purchased Shares (the "Conversion Price"), which is $2.22 per share (subject to appropriate adjustment for stock splits, dividends, combinations, recapitalizations and the like).
(3) Reflects the shares of Common Stock underlying the Series E Convertible Preferred Stock relating to the call right.
(4) Reflects the shares of Common Stock underlying the Repurchase Warrants relating to the call right.
(5) GSO Cactus Credit Opportunities Fund LP directly holds these securities.
(6) Steamboat Credit Opportunities Master Fund LP directly holds these securities.
(7) GSO Coastline Credit Partners LP directly holds these securities.
(8) GSO Aiguille des Grands Montets Fund II LP directly holds these securities.
(9) 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.
(10) GSO Credit-A Partners LP directly holds these securities. GSO Credit-A Associates LLC is the general partner of GSO Credit-A Partners LP.
(11) GSO Special Situations Fund LP directly holds these securities.
(12) 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").
(13) GSO Holdings I L.L.C. is the managing member of each of GSO Palmetto Opportunistic Associates LLC and GSO Credit-A Associates LLC.
(14) 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.
(15) Blackstone Holdings I L.P. is a managing member of each of GSO Holdings I L.L.C. and the sole member of 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.
(16) 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 (3) GSO Cactus Credit Opportunities Fund LP directly holds these securities.
(17) 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 4.
(18) 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.
(19) 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.

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