I Intelsat SA

Item 1(a). Name of Issuer:

Intelsat S.A. (the “Issuer”)

Item 1(b). Address of Issuer’s Principal Executive Offices:

4 rue Albert Borschette

Luxembourg

Grand-Duchy of Luxembourg

L-1246

Item 2(a). Name of Person(s) Filing:

The persons filing this Schedule 13G are:

SLP III Investment Holding S.à r.l.,

Silver Lake Partners III, L.P.,

Silver Lake Technology Investors III, L.P.,

Silver Lake Technology Associates III, L.P.,

SLTA III (GP), L.L.C. and

Silver Lake Group, L.L.C. (each, a “Reporting Person” and, together, the “Reporting Persons”).

Item 2(b). Address of Principal Business Office or, if none, Residence:

For purposes of this Schedule 13G, the address of the principal business office of the Reporting Persons is 2775 Sand Hill Road, Suite 100, Menlo Park, CA 94025.

Item 2(c). Citizenship:

See row 4 of the cover pages to this Schedule 13G.

Item 2(d). Title of Class of Securities:

This Schedule 13G relates to the Issuer’s common shares, nominal value $0.01 per share.

Item 2(e). CUSIP Number:

L5140P 101

Item 3. If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

Not applicable.

Item 4. Ownership.

All ownership percentages assume that there are 119,000,000 common shares outstanding, based on the Issuer’s Report on Form 6-K filed with the Securities and Exchange Commission on October 26, 2017.

The common shares beneficially owned by each of the Reporting Persons include 13,892,905 common shares held of record by SLP III Investment Holding S.à r.l. The common shares beneficially owned by Silver Lake Group, L.L.C. also include 277,780 common shares it holds directly.

The common shares held of record by SLP III Investment Holding S.à r.l. are beneficially owned by its shareholders Silver Lake Partners III, L.P. (“SLP”) and Silver Lake Technology Investors III, L.P. (“SLTI”). Silver Lake Technology Associates III, L.P. (“SLTA”) serves as the general partner of each of SLP and SLTI and may be deemed to beneficially own the shares directly owned by SLP and SLTI. SLTA III (GP), L.L.C. (“SLTA GP”) serves as the general partner of SLTA and may be deemed to beneficially own the shares directly owned by SLP and SLTI. Silver Lake Group, L.L.C. (“SLG”) serves as the managing member of SLTA GP and may be deemed to beneficially own the shares directly owned by SLP and SLTI.

As a result of the Governance Agreement described in Item 8 below, each of the Reporting Persons may be deemed to beneficially own and share voting power over certain common shares of the Issuer owned by the other Governance Shareholders (as defined below).

See row 9 of the cover sheet of each Reporting Person.

See row 11 of the cover sheet of each Reporting Person.

See row 5 of the cover sheet of each Reporting Person.

See row 6 of the cover sheet of each Reporting Person.

See row 7 of the cover sheet of each Reporting Person.

See row 8 of the cover sheet of each Reporting Person.

Item 5. Ownership of Five Percent or Less of a Class.

Not applicable.

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not applicable.

Item 8. Identification and Classification of Members of the Group.

The information set forth in Item 4 to this Schedule 13G is incorporated by reference.

On April 23, 2013, in connection with the initial public offering of the Issuer, SLP III Investment Holding S.à r.l. (the “Silver Lake Shareholder”), Serafina S.A. (the “BC Shareholder”), Mr. David McGlade (collectively with the Silver Lake Shareholder and the BC Shareholder, the “Governance Shareholders”) and the Issuer entered into a governance agreement (as amended from time to time, the “Governance Agreement”). Under the Governance Agreement, the Silver Lake Shareholder currently has the right to nominate one director for election to the Issuer’s board of directors and the BC Shareholder currently has the right to nominate four directors for election to the Issuer’s board of directors. The Governance Agreement also provides that a majority of the directors then in office (or, if the board has delegated such authority, the nomination or similar committee of the board) shall nominate the remaining directors for election to the board, one of whom shall be the Issuer’s executive chairman, who is currently Mr. McGlade, or if there is no executive chairman, the Issuer’s chief executive officer. Under the Governance Agreement, each of the Governance Shareholders has agreed to vote all shares held by it in favor of the directors nominated under the terms of the Governance Agreement and in furtherance of the removal of any directors by the BC Shareholder or the Silver Lake Shareholder under the terms of the Governance Agreement. Under the Governance Agreement, the Silver Lake Shareholder has certain tag-along rights on transfers by the BC Shareholder, and the BC Shareholder has drag-along rights with respect to the Silver Lake Shareholder under certain circumstances. The Governance Agreement is filed as an exhibit hereto, and the foregoing summary is qualified in its entirety by the terms thereof.

Given the terms of the Governance Agreement, the Reporting Persons, collectively with Serafina S.A. and certain related parties (collectively, the “Serafina Parties”) and Mr. McGlade, may be deemed to constitute a “group” that, as of the date hereof, collectively beneficially owns approximately 81,061,743 common shares, or approximately 67.0%, of the Issuer’s outstanding common shares for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the “Act”), assuming the conversion of all outstanding vested equity awards held by Mr. McGlade that are vested or that will vest within the next 60 days. Each Reporting Person disclaims beneficial ownership of the common shares of the Issuer other than the shares directly held by such Reporting Person. Pursuant to Rule 13d-1(k)(2) under the Act, the Serafina Parties and Mr. McGlade are each filing separate Schedule 13Gs with respect to the common shares of the Issuer.

Item 9. Notice of Dissolution of Group.

Not applicable.

Item 10. Certification.

Not applicable.

SIGNATURES

After reasonable inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct.

Dated: February 14, 2018

Exhibit Index