Exhibit 4.8

Execution Version

2021 NOTES SUPPLEMENTAL INDENTURE NO. 3

This 2021 NOTES SUPPLEMENTAL INDENTURE NO. 3, dated as of September 7, 2016 (this “Effective Date Guarantor Supplemental Indenture”), by and among Dell International L.L.C., a Delaware limited liability company (“Dell International”), EMC Corporation, a Massachusetts corporation (“EMC” and together with Dell International, the “Issuers”), Dell Technologies Inc. (f/k/a Denali Holding Inc.), a Delaware corporation (“Dell Technologies”), Denali Intermediate Inc., a Delaware corporation (“Denali Intermediate”), Dell Inc., a Delaware corporation (“Dell”), the other parties that are signatories hereto as Guarantors (collectively, the “Guaranteeing Subsidiaries” and each a “Guaranteeing Subsidiary”) and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”).

W I T N E S S E T H:

WHEREAS, each of Diamond 1 Finance Corporation, a Delaware corporation (“Finco 1”), Diamond 2 Finance Corporation, a Delaware corporation (“Finco 2” and together with Finco 1, the “Fincos”), and the Trustee has heretofore executed and delivered an indenture, dated as of June 22, 2016 (the “Base Indenture”), as supplemented by the 2021 Notes Supplemental Indenture No. 1, dated as of June 22, 2016, among the Fincos and the Trustee, as further supplemented by the First Supplemental Indenture, dated as of September 6, 2016, among the Fincos and the Trustee (together with the Base Indenture, the “Initial Indenture” and the Initial Indenture, together with the 2021 Notes Supplemental Indenture No. 2, dated as of the date hereof, and this Effective Date Guarantor Supplemental Indenture, and as further amended and supplemented, the “Indenture”) providing for the issuance of $1,625,000,000 aggregate principal amount of 5.875% Senior Notes due 2021 (the “2021 Notes”);

WHEREAS, the Initial Indenture permits the EMC Transactions (including, without limitation, the Mergers), provided that after the consummation of the Mergers, (x) Dell International and EMC, shall execute and deliver to the Trustee a supplemental indenture pursuant to which Dell International expressly assumes all the obligations of Finco 1 and EMC expressly assumes all the obligations of Finco 2 under the Initial Indenture and the Initial Notes and (y) Dell Technologies, Denali Intermediate, Dell and the Guaranteeing Subsidiaries (collectively, the “Effective Date Guarantors”) shall execute and deliver to the Trustee a supplemental indenture pursuant to which each of the Effective Date Guarantors shall unconditionally guarantee, on a joint and several basis, all of the Issuers’ Obligations under the Initial Indenture and the Initial Notes;

WHEREAS, as of the date hereof, each of Dell International, EMC and the Trustee has executed and delivered the Effective Date Issuers Supplemental Indentures pursuant to which Dell International assumes all the obligations of Finco 1 and EMC assumes all the obligations of Finco 2 under the Initial Indenture and the Initial Notes; and

WHEREAS, pursuant to Section 9.01 of the Initial Indenture, each of the Issuers, the Effective Date Guarantors and the Trustee is authorized to execute and deliver this Effective Date Guarantor Supplemental Indenture to amend or supplement the Initial Indenture without the consent of any Holder of any series of Notes.

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, each of the Issuers, the Effective Date Guarantors and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the 2021 Notes as follows:

(1) Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Initial Indenture.

(2) Agreement to Guarantee. Each Effective Date Guarantor hereby agrees to be a Guarantor under the Initial Indenture and to be bound by the terms of the Initial Indenture applicable to a Guarantor, including Article 10 thereof.

(4) Execution and Delivery. Each Effective Date Guarantor agrees that the Note Guarantee shall remain in full force and effect notwithstanding the absence of the endorsement of any notation of such Note Guarantee on the 2021 Notes.

(5) Governing Law. THIS EFFECTIVE DATE GUARANTOR SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

(6) Counterparts. The parties may sign any number of copies of this Effective Date Guarantor Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

(7) Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

(8) The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Effective Date Guarantor Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by Dell Technologies, Denali Intermediate, Dell and the Guaranteeing Subsidiaries.

[Signature Page Follows]

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IN WITNESS WHEREOF, the parties hereto have caused this Effective Date Guarantor Supplemental Indenture to be duly executed as of the date first above written.

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]

[Signature page to Guarantor Supplemental Indenture No. 3 (2021 Senior Notes)]