Exhibit 4.25

FOIA CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO CERTAIN INFORMATION IN

THIS AGREEMENT. THIS INFORMATION HAS BEEN REDACTED AND DENOTED BY ASTERISKS [***].



LOGO

NINETEENTH AMENDMENT TO

AGREEMENT 319-I

THIS NINETEENTH AMENDMENT TO AGREEMENT NUMBER 319-I IS ENTERED BY AND
BETWEEN HUGHES NETWORK SYSTEMS, LLC, A LIMITED LIABILITY COMPANY ORGANIZED AND EXISTING UNDER THE LAWS OF THE STATE OF DELAWARE WHICH SHALL HEREINAFTER BE REFERED AS THECLIENT, SUCCESSOR IN INTEREST TO HUGHES NETWORK
SYSTEMS, A DIVISION OF HUGHES ELECTRONICS CORPORATION, AND AS THE OTHER PARTY SATELITES MEXICANOS, S.A. DE C.V., WHICH SHALL HEREINAFTER BE REFERED AS SATMEX, A CORPORATION ORGANIZED AND EXISTING UNDER THE LAWS
OF MEXICO (TOGETHER REFERRED AS THE PARTIES) PURSUANT TO THE FOLLOWING:

W I T N E S S E T H

WHEREAS, on January 20, 2000, SATMEX and HUGHES ELECTRONICS CORPORATION, through theCLIENT, executed the agreement number 319-I, hereinafter the Agreement;

WHEREAS, on
May 16, 2000, SATMEX and HUGHES ELECTRONICS CORPORATION, through theCLIENTexecuted a First Amendment to the Agreement, in order to substitute transponder [***] for [***] and revise Exhibit C, Initial Loading
Plan;

WHEREAS, on January 1, 2001, SATMEX and HUGHES ELECTRONICS CORPORATION,
through theCLIENTexecuted a Second Amendment to the Agreement, in which HUGHESsobligation to take the [***] transponders changed from [***] to [***] and its use term was reduced from [***] months to [***];

WHEREAS, on March 1, 2001, SATMEX and HUGHES ELECTRONICS CORPORATION, through
theCLIENTexecuted a Third Amendment to the Agreement, in which HUGHESsobligation to take the [***] transponders changed from [***] to [***];

WHEREAS, on May 20, 2001, SATMEX and HUGHES ELECTRONICS CORPORATION, through the CLIENTexecuted a Fourth Amendment to the Agreement, in which the Parties agreed to substitute transponder [***] for [***];

WHEREAS, on January 1, 2002, SATMEX and HUGHES ELECTRONICS CORPORATION, through theCLIENTexecuted a Fifth Amendment to the Agreement, in which the Parties
increased the [***] additional transponders;

WHEREAS, on February 3, 2003, SATMEXand
HUGHES ELECTRONICS CORPORATIONexecuted a Sixth Amendment to the Agreement in which the Parties agreed to [***];

WHEREAS, on March 24, 2003, SATMEXand HUGHES ELECTRONICS CORPORATIONthrough the CLIENTexecuted a Seventh Amendment to the Agreement in which, among others,
the CLIENT increased [***];

WHEREAS, on May 1, 2003, SATMEXand HUGHES
ELECTRONICS CORPORATIONthrough the CLIENTexecuted an Eighth Amendment to the Agreement in which, among others, the CLIENT exercised the [***] increase option under the Second clause of the Seventh Amendment;

WHEREAS, on September 7, 2004, SATMEXand HUGHES ELECTRONICS CORPORATIONthrough
the CLIENT executed a Ninth Amendment to the Agreement in which, among others, theCLIENT increase [***] in Satmex 5 satellite, transponder [***];

WHEREAS, on June 14, 2005, SATMEX and Loral Skynet (Loral Skynet) a division of Loral
Spacecom Corp. entered into an Agreement for the end of life lease of the [***] transponder on Satmex 5, hereinafter the [***];

WHEREAS, on September 7, 2005, SATMEX entered into a companys reorganization under Mexican reorganization law called Concurso Mercantil according to sentence dictated
by Judge Second of District in Civil Matter, in the Federal District of Mexico;



CONFIDENTIAL



Page 1 of 4



---

FOIA CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO CERTAIN INFORMATION
IN

THIS AGREEMENT. THIS INFORMATION HAS BEEN REDACTED AND DENOTED BY ASTERISKS [***].



LOGO



WHEREAS, on December 1, 2005, SATMEXand HUGHES
ELECTRONICS CORPORATIONthrough theCLIENT executed a Tenth Amendment to the Agreement in which, among others, theCLIENT [***], to result on a total capacity of [***], applying this capacity of [***] to
CLIENTS Bottom of Social Cover Program (FONCOS);

WHEREAS, on
January 20, 2006, SATMEXand HUGHES ELECTRONICS CORPORATIONthrough theCLIENT executed an Eleventh Amendment to the Agreement in which, among others, theCLIENT restructured [***] on Satmex 5 satellite
and extended the term from [***] through [***];

WHEREAS, on February 1, 2006, SATMEXand
HUGHES ELECTRONICS CORPORATIONthrough theCLIENT executed a Twelfth Amendment to the Agreement in which, among others, the Parties agreed to [***] the term of the contracted capacity in Satmex 5 satellite, under certain
[***] commitment terms; and

WHEREAS, on September 15, 2006, SATMEXand HUGHES
ELECTRONICS CORPORATIONthrough theCLIENT executed a Thirteenth Amendment to the Agreement in which, among others, the Parties agreed to[***] the space segment capacity on Satmex 6 satellite.

WHEREAS, on August 1st,2008, SATMEXand HUGHES ELECTRONICS CORPORATIONthrough theCLIENT executed a Fourteenth
Amendment to the Agreement in which, among others, the Parties agreed to [***].

WHEREAS, on February 1st,2009, SATMEXand HUGHES ELECTRONICS CORPORATIONthrough theCLIENT executed a Fifteenth
Amendment to the Agreement in which, the Parties agreed to [***]; to result a [***].

WHEREAS, on July 1st,2009, SATMEXand HUGHES ELECTRONICS CORPORATIONthrough theCLIENT executed a Sixteenth
Amendment to the Agreement in which, the Parties agreed to [***] in Satellite Satmex 5, [***] in order to result a [***].

WHEREAS, on October 1st,2009, SATMEXand HUGHES ELECTRONICS CORPORATIONthrough theCLIENT executed a Seventeenth Amendment to the Agreement in which, the Parties agreed to [***] on Satmex 5 and
Satmex 6 satellites.

WHEREAS, on July 1st,2010, SATMEXand HUGHES ELECTRONICS CORPORATIONthrough theCLIENT executed an Eighteenth Amendment to the Agreement in which, the Parties agreed to [***] of SATMEX 6 satellite starting on [***].

NOW THEREFORE, in consideration of the foregoing and mutual covenants contained in this Nineteenth Amendment, the Parties agree as follows:

A G R E E M E N T

FIRST.TheCLIENTand SATMEX accept and recognize that since August 1st, 2010 the satellite capacity was [***] in Satmex 5 satellite, transponders [***] and in Satmex 6, transponders [***],
in order to result a [***].

The Parties agree that this capacity [***] in accordance with the terms and conditions of the
[***] as established in the Third Clause of the Fourteenth Amendment.

Therefore, the transponders related to the [***] were
as follows:



| | a) | [***] for Satmex 5 satellite:
| | -- | -----------------------------



CONFIDENTIAL



Page 2 of 4



---

FOIA CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO CERTAIN INFORMATION
IN THIS AGREEMENT. THIS INFORMATION HAS BEEN REDACTED AND DENOTED BY ASTERISKS [***].



LOGO



|          |  |       |  |       |  |                                         |  |                        
|--------- |  | ----- |  | ----- |  | --------------------------------------- |  | -----------------------
|Satellite |  | Band  |  | Txdrs |  | BandwidthMHz                            |  | Period                 
|Satmex 5  |  | [***] |  | [***] |  | [***]                                   |  | From [***], until [***]
|          |  | [***] |  | [***] |  | From [***], until [***]                
|          |  | [***] |  | [***] |  | It was effective from [***] until [***]
|          |  | [***] |  | [***] |  | From [***], until [***]                



| | b) | [***] for Satmex 6 satellite:
| | -- | -----------------------------



|          |  |       |  |       |  |                                         |  |       
|--------- |  | ----- |  | ----- |  | --------------------------------------- |  | ------
|Satellite |  | Band  |  | Txdrs |  | BandwidthMHz                            |  | Period
|          |  | [***] |  | [***] |  | From [***] until [***]                 
|          |  | [***] |  | [***] |  | It was effective until [***]           
|Satmex 6  |  | [***] |  | [***] |  | It was effective from [***]            
|          |  | [***] |  | [***] |  | From [***], until [***].               
|          |  | [***] |  | [***] |  | It was effective from [***] until [***]



| | c) | The [***] remained with no change as follows:
| | -- | ---------------------------------------------



|          |  |       |  |        |  |       |  |              |  |                         
|--------- |  | ----- |  | ------ |  | ----- |  | ------------ |  | ------------------------
|Satellite |  | Band  |  | Region |  | Txdrs |  | BandwidthMHz |  | Period                  
|Satmex 5  |  | [***] |  | [***]  |  | [***] |  | [***]        |  | From [***] through [***]

Since [***], Capacity on transponder [***] on SATMEX 5 satellite become part of the [***]

From [***], all the SATMEX 5 transponders currently on a [***] will be part of the [***].

Note: SATMEX will not unreasonably refuse CLIENTs request to change the assigned fixed transponder
to another fixed transponder from time to time. The intent of the Parties pursuant this Clause is that CLIENT is committing to a full [***] month term for [***] transponders, but the actual assigned transponders may [***] during the term
hereof.



CONFIDENTIAL



Page 3 of 4



---

FOIA CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO CERTAIN INFORMATION
IN THIS AGREEMENT. THIS INFORMATION HAS BEEN REDACTED AND DENOTED BY ASTERISKS [***].



LOGO



SECOND. The Parties accept and recognize the modification to the
[***] described on Second Clause of the Seventeenth Amendment; therefore, the [***] consisted of [***] transponders on SATMEX 5 and SATMEX 6 satellites, of 36 MHz each one.

THIRD. The term of this Nineteenth Amendment shall be considered retroactive to
August 1st, 2010 and shall terminate in accordance
with the terms and conditions set forth in the Seventeenth Amendment.

FOURTH.All notices to be
provided under the Amendments and/or the Agreement shall be in accordance with the terms and conditions set forth in the Seventeenth Amendment.

FIFTH. This Amendment, the underlying commercial relationship between the Parties, and all collateral matters relating thereto, shall be governed by, and construed in accordance with
Section 33 of the Agreement.

SIXTH.Except as specifically amended hereby, the terms and
conditions of the Agreement and its past Amendments, shall remain in full force and effect in accordance with its terms.

This Nineteenth
Amendment is signed in counterparts, one copy remaining in possession of each Party.



|                                      |  |                                             
|------------------------------------- |  | --------------------------------------------
|FOR THE CLIENT
HUGHES NETWORK SYSTEMS |  | FOR SATMEX SATÉLITES MEXICANOS, S.A. DE C.V.
|                                      | 
|/s/ Philip K. OBrien                 |  | /s/ Patricio E. Northland                   
|PHILIP K. OBRIEN
VICE PRESIDENT      |  | PATRICIO E. NORTHLAND GENERAL DIRECTOR      
|Date:                                 |  | Date:                                       

SIGNATURE PAGE OF THE NINETEENTH AMENDMENT TO AGREEMENT NUMBER 319-I EXECUTED BY AND BETWEEN HUGHES NETWORK SYSTEMS
AND SATELITES MEXICANOS, S.A. DE C.V.



CONFIDENTIAL



Page 4 of 4