Company: SGBAF
Filing Date: 2025-07-17
Form Type: 6-K
Source: 0001193125-25-160505
Chunk: 0

Company: SES S.A.
Filing Date: 2025-07-17
Form: 6-K
Chunk 0
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### UNITED STATES

### SECURITIES
AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

Pursuant to Rule 13a-16or 15d-16

of the Securities Exchange Act of 1934

Date: July 17, 2025

Commission File Number: 333-286828

SES

(Translation of registrant’s name into English)

Château de Betzdorf

L-6815Betzdorf

Grand Duchy of Luxembourg

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form
20-F or Form 40-F.

Form
20-F ☒ Form 40-F ☐

INFORMATION CONTAINED IN THIS FORM 6-KREPORT Completion of Acquisition On July 17, 2025 (the “Closing Date”), SES (the “Company”) completed its previously announced acquisition (the “Acquisition”) of Intelsat Holdings S.a.r.l. and its subsidiaries pursuant to the share purchase agreement, dated as of April 30, 2024 (the “Share Purchase Agreement”), by and between the Company and Intelsat S.A. (“Intelsat”). The Company issued a press release, attached hereto as Exhibit 99.1, announcing the foregoing event. Historical information of Intelsat and its subsidiaries, as well as pro forma financial information of the Company, was included in the Company’s prospectus supplement, dated May 14, 2025, filed with the Securities and Exchange Commission on May 15, 2025 (File No. 333-286828). Contingent Value Rights Agreement On the Closing Date, in connection with the consummation of the Acquisition and as contemplated by the Share Purchase Agreement, the Company entered into a Contingent Value Rights Agreement (the “CVR Agreement”) with Equiniti Trust Company, LLC, as rights agent, pursuant to which the Company issued 70,139,990 Contingent Value Rights to Intelsat as part of the consideration for the Acquisition, which were then distributed by Intelsat to Intelsat’s shareholders (including holders of Intelsat’s vested RSUs and PSUs). A copy of the CVR Agreement is attached hereto as Exhibit 99.2. Exhibit Index The following exhibits are filed as part of this Form 6-K:

SIGNATURE Pursuant to the requirements