UNITED
STATES

SECURITIES
AND EXCHANGE COMMISSION

Washington,
D.C. 20549



FORM
10-K/A

Amendment
No. 1



|[X]  | ANNUAL
    REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934    
|---- | --------------------------------------------------------------------------------------------
|     |                                                                                             
|     | For
    the fiscal year ended March 31, 2013                                                
|     |                                                                                             
|     | Or                                                                                          
|     |                                                                                             
|[  ] | TRANSITION
    REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|     |                                                                                             
|     | For
    the transition period from _________ to _____________                               



Commission
file number: 000-51425



T-REX
OIL, INC.

(Formerly
Rancher Energy Corporation)

(Exact
name of registrant as specified in its charter)



|Nevada                                                                                                                                                                                                                         |  | 98-0422451                                                                                                                                                                                          
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|State
                                         or other jurisdiction of
                                                                                incorporation
                                         or organization |  | I.R.S.
                                         Employer
                                                                                Identification
                                         No.



| | P.O.
    Box 40, Henderson, CO 80640                    | 
| | ------------------------------------------------------- | 
| | (Address
    of principal executive offices) (Zip Code) | 
| |                                                         | 
| | Registrant’s
    telephone number, including area code: | 
| |                                                         | 



| | Securities
    registered pursuant to Section 12(b) of the Act: | 
| | --------------------------------------------------------------- | 



|Title
    of each class registered |  | Name
    of each exchange on which registered
|---------------------------------- |  | ---------------------------------------------
|Not
    Applicable                 |  | Not
    Applicable                           



| | Securities
    registered pursuant to Section 12(g) of the Act:                        | 
| | -------------------------------------------------------------------------------------- | 
| | Common
                                         Stock
        (Title
        of class) | 





Indicate
by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes
[  ] No [X]



Indicate
by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

[  ]



Indicate
by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange
Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports),
and (2) has been subject to such filing requirements for the past 90 days.

Yes
[X] No [  ]



Indicate
by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive
Data file required to be submitted and posted pursuant to Rule 405 of Regulation S-T (section 232.405 of this chapter) during
the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files)

Yes
[  ] No [  ]



Indicate
by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (ss. 229.405 of this chapter) is not contained
herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.



[X]



Indicate
by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller
reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller
reporting company” in Rule 12b-2 of the Exchange Act. (Check One).



|Large
    accelerated filer                                                                                                  | [  ] |  | Accelerated
    filer         | [  ]
|---------------------------------------------------------------------------------------------------------------------------- | ---- |  | ----------------------------- | ----
|Non-accelerated
                                         filer
        (Do
        not check if a smaller reporting company) | [  ] |  | Smaller
    reporting company | [X] 



Indicate
by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes
[  ] No [X]



APPLICABLE
ONLY TO REGISTRANTS INVOLVED IN BANKRUPTCY

PROCEEDINGS
DURING THE PRECEDING FIVE YEARS:



Indicate
by check mark whether the registrant has filed all documents and reports required to be filed by Section 12, 13 or 15(d) of the
Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.

Yes
[  ] No [X]



On
June 11, 2013, 89,701,994 shares of common stock were held by non-affiliates and had a value of $12,199,471 based on the average
closing bid and ask of $0.136 per share.



The
number of shares outstanding of the registrant’s common stock, $0.00001 par value, as of June 11, 2013 was 119,862,791.



DOCUMENTS
INCORPORATED BY REFERENCE





None.
















SIGNATURES



Pursuant
to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report
to be signed on its behalf by the undersigned, thereunto duly authorized.



|                         | T-REX
    OIL, INC.                 
|------------------------ | ------------------------------------
|                         | (fka
    Rancher Energy Corporation)
|Dated:
    June 27, 2016 |                                     
|                         | By:                                 
|                         |                                     
|                         |                                     
|                         |                                     
|Dated:
    June 27, 2016 |                                     
|                         | By:                                 
|                         |                                     
|                         |                                     



Pursuant
to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.



|Dated:
    June 27, 2016 | T-REX
    OIL, INC.                 
|------------------------ | ------------------------------------
|                         | (fka
    Rancher Energy Corporation)
|                         |                                     
|                         | /s/
    Donald Walford              
|                         | Donald
    Walford, Director        
|                         |                                     
|                         | /s/
    Martin Gottlob              
|                         | Martin
    Gottlob, Director        
|                         |                                     
|                         | /s/
    Allen Heim                  
|                         | Allen
    Heim, Director            
|                         |                                     
|                         | /s/
    Herbert T. Sears            
|                         | Herbert
    Sears, Director