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
                                                                                  
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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(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

STERN EDWARD M 		2. Issuer Name and Ticker or Trading Symbol

RENTECH INC /CO/ [ RTK ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

501 KINGS HIGHWAY EAST (SUITE 300), C/O NEPTUNE 		3. Date of Earliest Transaction (MM/DD/YYYY)

5/11/2011
(Street)

FAIRFIELD, CT 06825
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   5/11/2011     A    55000   A $0   216100   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 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
Option to Purchase Common Stock   $3.76                    12/12/2006   12/11/2016   Common Stock   20000     20000   D    
Option to Purchase Common Stock   $2.68                    3/22/2008   3/21/2013   Common Stock   15000     15000   D    
Option to Purchase Common Stock   $1.39                    4/17/2009   4/17/2014   Common Stock   15000     15000   D    
Option to Purchase Common Stock   $.60                    5/11/2010   5/27/2015   Common Stock   15000     15000   D    
Option to Purchase Common Stock   $1.20                    5/11/2011   5/10/2016   Common Stock   26500     26500   D    
Restricted Stock Unit     (1) 5/11/2011     A      27500         (1) 5/10/2012   Common Stock   27500   $0   27500   D    

Explanation of Responses:
( 1)  Each restricted stock unit represents a contingent right to receive one share of common stock. The restricted stock unit vests on May 11, 2012, subject to the reporting person's continued service on the Company's board of directors, provided that the restricted stock unit shall be fully vested as of the date of the Company's 2012 Annual Meeting of Shareholders.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
STERN EDWARD M
501 KINGS HIGHWAY EAST (SUITE 300)
C/O NEPTUNE
FAIRFIELD, CT 06825 		X



Signatures
/s/ Colin M. Morris, by Power of Attorney 5/13/2011
** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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