SeSa S p A : Treasury Shares Buyback Plan – Update (November 18, 2025)

Sesa S.p.A. informs that, under the new treasury share buyback plan (second stage) approved by the Board of Directors on November 4, 2025, in execution of the resolution of the Shareholders' Meeting held on August 27, 2025 and launched on November 5, 2025, the Company purchased a total of 19,127 Sesa ordinary shares in the period between November 10, 2025 and November 14, 2025, representing 0.12466180% of the Company's share capital, at an average price of Euro 82.0971 per share before fees, for a total value of Euro 1,570,272.

The stock buyback plan is executed, through the authorised intermediary Intermonte SIM S.p.A., in compliance with applicable laws and regulations and with the terms and conditions of the authorization to purchase and dispose of treasury shares. As a result of these transactions, as of November 14, 2025, Sesa

S.p.A. holds 170,533 ordinary shares, representing 1.11146292% of the current share capital.

The following table provides details of the purchases made during the period mentioned above:

* The gross average price is calculated as the daily average gross price operations weighted by the quantities purchased in the day.

Any further transactions will be disclosed to the market in accordance with the terms and conditions laid down by the rules in force.

Sesa S.p.A., with Headquarters in Empoli (Florence), it leads a Group operating throughout Italy and in several foreign countries, including Germany, Switzerland, Austria, France, Spain, the Benelux and Romania, and is the reference operator in the Digital Technology, Consulting, and Vertical Application sector for companies and organizations, with consolidated revenues of Eu 3,356.8 million (+4.6% Y/Y) and 6,532 employees as of 30 April 2025 (+14.8% Y/Y). Sesa has the mission of offering a platform for enablement and innovation, including digital innovation, and sustainable growth for enterprises and organizations, operating at Group level as a Digital Integrator that supports enterprises and organizations in their digital transformation journey, through the following business sectors:

• SSI (Software and System Integration) with revenues of Eu 875.7 million and 4,243 Human Resources as of April 30, 2025.

• BS (Business Services) with revenues of Eu 153.5 million and 962 Human Resources as of April 30, 2025.

• ICT VAS (ICT Value Added Solutions) with revenues of Eu 2,075.5 million and 711 Human Resources as of April 30, 2025.

• Green VAS (Digital Green Value Added Solutions) with revenues of Eu 343.8 million and 95 Human Resources as of April 30, 2025.

• Corporate with revenues of Eu 62 million and 521 Human Resources as of April 30, 2025.

The Sesa Group pursues a policy of sustainable development for the benefit of its stakeholders and, over the period 2012-2025, has achieved a continuous growth track record in revenues (CAGR revenues 2012-2025 +11.5%), profitability (CAGR Ebitda 2012-2025

+14.53%) and employment (CAGR Human Resources 2012-2025 +16.8%). The long-term value generation strategy is based on the development of skills and applications and the adoption of digital enablers such as AI, Automation and Digital Platforms, with attention to environmental sustainability, social responsibility and the remuneration of all stakeholders.

As of April 30, 2025, the Group distributed a total economic value of Eu 450 million (+15% Y/Y), of which over 70% was allocated to the remuneration of human resources, with 6,532 employees (+14.8% Y/Y), the expansion of hiring, education and corporate welfare programs in support of work-life balance and the well-being of human resources. Sesa has integrated sustainable growth targets into its Articles of Association among the priority tasks of the Board of Directors and, starting from the 2022 fiscal year, prepares an Integrated Annual Report that represents, in a single, complete and transparent document, in application of international reporting standards, both financial and ESG performance. In terms of sustainability governance, the main Group companies are ISO 14001 certified and adhere to the UN Global Compact. Sesa has obtained the Ecovadis Platinum rating, the highest level of sustainability achievable, as well as the MSCI ESG BBB rating and the CDP B rating.

Sesa is listed on the Euronext STAR Milan market (ISIN Code: IT0004729759) and is included in the FTSE Italia Mid Cap index. Moreover, Sesa is part of Euronext Tech Leaders, an Euronext initiative dedicated to high-growth tech companies