6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

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

Under the Securities Exchange Act of 1934

Date: June 18, 2026

Commission File Number: 333-286828

SES

(Translation ofregistrant’s name into English)

Château de Betzdorf

L-6815 Betzdorf

Grand Duchy of Luxembourg

(Address of principal executive office)

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 ☐

Other Events

On April 2, 2026, SES issued a press release announcing the results of the Extraordinary General Meeting of SES’ shareholders held on June 17, 2026.

A copy of the press release is attached hereto as exhibit 99.1.

Exhibit Index

The following exhibit is furnished as part of this Form 6-K:

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

EX-99.1

Exhibit 99.1

<br><br><br><br><br> <br><br> <br>Press Release

SES Announces Results of the Extraordinary General

Meeting of Shareholders

Luxembourg, June 17, 2026 – SES (the “Company”) held an Extraordinary General Meeting (“EGM”) of Shareholders today in Betzdorf, Luxembourg.

Following the recommendations made by the Board of Directors of SES, the shareholders have voted in favor of all resolutions. In particular, shareholders approved the cancellation of shares repurchased under the Company’s share buyback program of 2 November 2023, as amended on 2 May 2024, resulting in a corresponding reduction of the Company’s share capital. Shareholders also approved amendments to the Company’s articles of association, including indemnification for Board members and executives, as well as updates relating to the conduct of shareholder meetings.

Detailed results on all matters voted on at the EGM will be available on the company’s webpage:

https://www.ses.com/company/investors/shareholder-information/general-meeting-shareholders

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About SES

At SES, we believe that space has the power to make a difference. That’s why we design space solutions that help governments protect, businesses grow, and people stay connected—no matter where they are. With integrated multi-orbit satellites and our global terrestrial network, we deliver resilient, seamless connectivity and the highest quality video content to those shaping what’s next. Following our Intelsat acquisition, we now offer more than 100 years of combined global industry leadership—backed by a track record of bringing innovation “firsts” to market. As a trusted partner to customers and the global space ecosystem, SES is driving impact that goes far beyond coverage. The company is headquartered in Luxembourg and listed on Paris and Luxembourg stock exchanges (Ticker: SESG). Further information is available at: www.ses.com