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 of the

Securities Exchange Act of 1934

Date: September 26, 2025

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 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 ☐

Explanatory Note

On September 26, 2025, SES (the “Company”) issued a press release announcing an interim dividend to be paid in October 2025. A copy of the press release is furnished as Exhibit 99.1 to this Report on Form 6-K and incorporated by reference herein.

On September 26, 2025, the Company issued a press release announcing the appointment of Joseph Cohen to the Company’s Board of Directors and the departure of Kaj-Erik Relander from the Company’s Board of Directors. A copy of the press release is furnished as Exhibit 99.2 to this Report on Form 6-K and incorporated by reference herein.

EXHIBIT INDEX

Exhibit	Description
99.1	Press Release, dated September 26, 2025
99.2	Press release, dated September 26, 2025

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.

	SES
	(registrant)
Date: September 26, 2025	By:	/s/ Aaron Shourie
	Name:	Aaron Shourie
	Title:	Chief Legal Officer

EX-99.1

Exhibit 99.1

<br><br><br><br><br> <br><br> <br><br><br><br>Press Release
SES Confirms Interim Dividend of EUR 0.25

Interim dividend of EUR 0.25 per A-share approved as part of SES’scontinued commitment to shareholder returns intended to be at least EUR 0.50 total dividend for FY2025

Luxembourg, September 26, 2025 – The SES Board of Directors has approved the payment of an interim dividend of EUR 0.25 per A-share (EUR 0.10 per B-share) to be paid to shareholders on October 16, 2025, in line with SES’s commitment to shareholder returns.

The interim dividend to be paid in October 2025 will be followed, subject to financial results and shareholder approval, by the payment of a final dividend of at least EUR 0.25 per A-share (EUR 0.10 per B-share) in April 2026.

For further information please contact:

Christian Kern

Investor Relations

Tel: +352 710 725 7787

christian.kern@ses.com

Suzanne Ong

Communications

Tel. +352 710 725 500

suzanne.ong@ses.com

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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

Forward-looking Statements

This press release contains, and our officers and representatives may from time to time make, certain “forward-looking statements” within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such as “anticipate,” “estimate,” “expect,” “intend,” “likely,” “believe,” “will,” and similar expressions or their negative. Examples of forward-looking statements include, among others, statements we make regarding the dividend and financial results and the expected timing, impacts and benefits thereof.

Forward-looking statements are not assurances of future performance and are subject to inherent uncertainties and risks that are difficult to predict such as: the company’s ability to achieve the synergies expected from the acquisition of Intelsat, as well as risks, delays, challenges and expenses associated with integration; competitive pressures in the telecommunications industry, including shifts in demand for satellite, terrestrial networks and alternate distribution technologies; pursuit of opportunities or contracts may not yield the expected benefits; delays or failures in satellite launches, deployments, or operations, including technical malfunctions or satellite lifespan limitations; and liquidity, currency and foreign exchange and counterparty risks.

Other factors that might cause such a difference include those discussed in our filings with the US Securities and Exchange Commission, including our Form F-4. Should one or more of these uncertainties or risks materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those anticipated. Therefore, you should not rely on any of these forward-looking statements. The forward-looking statements included in this press release are made only as of the date hereof and, we undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

EX-99.2

Exhibit 99.2

Press Release

SES Appoints Joseph Cohen to Board of Directors

With deep expertise in private equity, capital markets, and corporate finance, Joseph brings decades of financial leadership to the SES board

Luxembourg, September 26, 2025 – SES today announced the appointment of Mr. Joseph Cohen, Co-Founding Partner of Trilantic Europe, to its Board of Directors effective immediately. This appointment is part of SES’s ongoing commitment to regularly review and strengthen the composition of its Board with diverse expertise and industry experience, ensuring the company is well positioned for future growth and value creation.

Prior to his role as Co-Founding Partner of Trilantic Europe, Mr. Cohen spent over two decades at Lehman Brothers, including as European Co-Head of Lehman Brothers Merchant Banking and on the Investment Management Division’s European operating committee, among other roles. A U.K. citizen, he holds a BSc in Economics from the London School of Economics.

Additionally, Mr. Kaj-Erik Relander has decided to step down from the SES Board of Directors, concluding a tenure marked by valuable contributions to strategy and governance.

Frank Esser, Chairman of the Board of Directors of SES, said, “On behalf of SES, I would like to thank Kaj-Erik Relander for his valuable contributions and dedicated service to SES during his tenure on the Board. At the same time, I am delighted to welcome Joseph Cohen as a new director. His extensive experience in private equity, corporate finance and capital markets will be instrumental as we continue to strengthen our governance and drive long-term growth for SES.”

For further information please contact:

Suzanne Ong

Communications

Tel. +352 710 725 500

suzanne.ong@ses.com

Christian Kern

Investor Relations

Tel: +352 710 725 7787

christian.kern@ses.com

Follow us on:

Read our Blogs >

Visit the Media Gallery >

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