Exhibit 2.19





VIDEOTRON LTD. / VIDÉOTRON LTÉE





EIGHTH
SUPPLEMENTAL INDENTURE

Dated as of May
2nd, 2011





Wells Fargo Bank, National Association,

Trustee











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EIGHTH SUPPLEMENTAL INDENTURE, dated as of May 2nd, 2011 (this Eighth Supplemental Indenture), by
and among Videotron Ltd. / Vidéotron Ltée, a company continued under the laws of the Province of Québec (the Company), Jobboom Inc., a corporation incorporated under the laws of Canada (the Additional
Subsidiary Guarantor) and Wells Fargo Bank, National Association, as trustee (the Trustee), to the Indenture, dated as of September 16, 2005 (as supplemented by the supplemental indenture dated as of April 15,
2008 (the First Supplemental Indenture), by and among the Company, the person listed as an additional subsidiary guarantor on the signature page to the First Supplemental Indenture (the First Additional Subsidiary
Guarantor), and the Trustee, as further supplemented by the supplemental indenture dated as of April 28, 2008 (the Second Supplemental Indenture), by and among the Company, the person listed as an additional
subsidiary guarantor on the signature page to the Second Supplemental Indenture (the Second Additional Subsidiary Guarantor), and the Trustee, as further supplemented by the supplemental indenture dated as of September 23,
2008 (the Third Supplemental Indenture), by and among the Company, the person listed as an additional subsidiary guarantor on the signature page to the Third Supplemental Indenture (the Third Additional Subsidiary
Guarantor), and the Trustee, as further supplemented by the supplemental indenture dated as of August 17, 2009 (the Fourth Supplemental Indenture), by and among the Company, the person listed as an additional
subsidiary guarantor on the signature page to the Fourth Supplemental Indenture (the Fourth Additional Subsidiary Guarantor), and the Trustee, as further supplemented by the supplemental indenture dated as of September 2,
2009 (the Fifth Supplemental Indenture), by and among the Company, the person listed as an additional subsidiary guarantor on the signature page to the Fifth Supplemental Indenture (the Fifth Additional Subsidiary
Guarantor), and the Trustee, as further supplemented by the supplemental indenture dated as of September 29, 2010 (the Sixth Supplemental Indenture), by and among the Company, the person listed as an additional
subsidiary guarantor on the signature page to the Sixth Supplemental Indenture (the Sixth Additional Subsidiary Guarantor), and the Trustee, and as further supplemented by the supplemental indenture dated as of December 22,
2010 (the Seventh Supplemental Indenture), by and among the Company, each person listed as a subsidiary guarantor on the signature pages to the Seventh Supplemental Indenture (collectively referred to as the Seventh
Additional Subsidiary Guarantors), and the Trustee, the Indenture), by and among the Company, each person listed as a guarantor on the signature pages to the Indenture (collectively referred to as the Original
Subsidiary Guarantors) and the Trustee.

WHEREAS, the Company, the Original Subsidiary
Guarantors and the Trustee entered into the Indenture governing the Companys 6 3/8% Senior Notes due December 15, 2015 (the Notes);

WHEREAS, Section 4.19 of the Indenture provides that under certain circumstances the Company shall cause a Restricted Subsidiary to
execute and deliver to the Trustee a supplemental indenture providing for a Subsidiary Guarantee of the payment of the Notes by such Restricted Subsidiary;

WHEREAS, pursuant to the First Supplemental Indenture, the First Additional Subsidiary Guarantor provided for such a Subsidiary Guarantee;

WHEREAS, pursuant to the Second Supplemental Indenture, the Second Additional Subsidiary Guarantor provided for such a Subsidiary
Guarantee;



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WHEREAS, pursuant to the Third Supplemental Indenture, the Third Additional Subsidiary
Guarantor provided for such a Subsidiary Guarantee;

WHEREAS, pursuant to the Fourth Supplemental Indenture, the Fourth
Additional Subsidiary Guarantor provided for such a Subsidiary Guarantee;

WHEREAS, pursuant to the Fifth Supplemental
Indenture, the Fifth Additional Subsidiary Guarantor provided for such a Subsidiary Guarantee;

WHEREAS, pursuant to the Sixth
Supplemental Indenture, the Sixth Additional Subsidiary Guarantor provided for such a Subsidiary Guarantee;

WHEREAS, pursuant
to the Seventh Supplemental Indenture, the Seventh Additional Subsidiary Guarantors provided for such Subsidiary Guarantees;

WHEREAS, the parties hereto are desirous of further supplementing the Indenture in the manner hereinafter provided for the purpose of
providing a Subsidiary Guarantee by the Additional Subsidiary Guarantor in accordance with the terms of the Indenture;

WHEREAS, Section 9.01(e) of the Indenture provides that the Company and the Trustee may amend or supplement the Indenture without
the consent of any Holder to add additional guarantees with respect to the Notes; and

WHEREAS, all things necessary have been
done to make this Eighth Supplemental Indenture a valid agreement of the Company, the Additional Subsidiary Guarantor and the Trustee, in accordance with its terms.

NOW, THEREFORE, THIS EIGHTH SUPPLEMENTAL INDENTURE WITNESSETH:

For and in
consideration of the premises contained herein, the parties hereto mutually covenant and agree as follows:

1. Terms used in
this Eighth Supplemental Indenture that are not defined herein shall have the meanings set forth in the Indenture.

2. The
Additional Subsidiary Guarantor hereby agrees to provide an unconditional Subsidiary Guarantee on the terms and subject to the conditions and limitations set forth in the Indenture, including but not limited to Article 10 of the Indenture.

3. This Eighth Supplemental Indenture shall be construed as supplemental to the Indenture and shall form a part thereof, and
the Indenture is hereby incorporated by reference herein and, as supplemented, modified and restated hereby, is hereby ratified, approved and confirmed.

4. This Eighth Supplemental Indenture shall be effective as of the date hereof. On and after the date hereof, each reference in the Indenture to this Indenture, hereunder,
hereof, or herein shall mean and be a reference to the Indenture as supplemented by this Eighth Supplemental Indenture unless the context otherwise requires.



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5. Except as provided below, in the event of a conflict between the terms and conditions of
the Indenture and the terms and conditions of this Eighth Supplemental Indenture, the terms and conditions of this Eighth Supplemental Indenture shall prevail.

6. If any provision of this Eighth Supplemental Indenture limits, qualifies or conflicts with another provision of the Indenture that is required to be included by the Trust Indenture Act of 1939, as
amended (the Act), as in force at the date this Eighth Supplemental Indenture is executed, the provision required by said Act shall control.

7. This Eighth Supplemental Indenture shall be governed and construed in accordance with the laws of the State of New York.

8. This Eighth Supplemental Indenture may be signed in any number of counterparts with the same effect as if the signatures to each counterpart were upon a single instrument, and all such counterparts
together shall be deemed an original of this Eighth Supplemental Indenture.

9. The recitals contained in this Eighth
Supplemental Indenture shall be taken as the statements of the Company, and the Trustee assumes no responsibility for their correctness. The Trustee makes no representations as to the validity or sufficiency of this Eighth Supplemental Indenture.

[SIGNATURES ON FOLLOWING PAGES]



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IN WITNESS WHEREOF, the parties hereto have caused this Eighth Supplemental Indenture to be
duly executed as of the day and year first above written.



|                                       |  |                           |  |  |  |     |  |                           
|-------------------------------------- |  | ------------------------- |  |  |  | --- |  | --------------------------
|COMPANY:                               |  |                           |  |  |  |    
|                                       |  |                           | 
|VIDÉOTRON LTÉE                         |  |                           |  |  |  |    
|                                       |  |                           |  | 
|By:                                    |  | /s/ Chloé Poirier         |  |  |  | By: |  | /s/ Christian Marcoux     
|                                       |  | Name: Chloé Poirier       |  |  |  |     |  | Name: Christian Marcoux   
|                                       |  | Title: Treasurer          |  |  |  |     |  | Title: Assistant Secretary
|                                       |  |                           | 
|ADDITIONAL SUBSIDIARY GUARANTOR:       |  |                           |  |  |  |    
|                                       |  |                           | 
|JOBBOOM INC.                           |  |                           |  |  |  |    
|                                       |  |                           |  | 
|By:                                    |  | /s/ Chloé Poirier         |  |  |  | By: |  | /s/ Christian Marcoux     
|                                       |  | Name: Chloé Poirier       |  |  |  |     |  | Name: Christian Marcoux   
|                                       |  | Title: Treasurer          |  |  |  |     |  | Title: Assistant Secretary
|                                       |  |                           | 
|TRUSTEE:                               |  |                           |  |  |  |    
|                                       |  |                           | 
|WELLS FARGO BANK, NATIONAL ASSOCIATION |  |                           |  |  |  |    
|                                       |  |                           |  | 
|By:                                    |  | /s/ Raymond Delli Colli   |  |  |  |     |  |                           
|                                       |  | Name: Raymond Delli Colli |  |  |  |     |  |                           
|                                       |  | Title: Vice President     |  |  |  |     |  |                           

Eighth Supplemental Indenture to 2005 Indenture