Filed by Alcatel-Lucent S.A.

pursuant to Rule 425 under the Securities Act of 1933

Subject Company: Alcatel-Lucent S.A.

(Registration Statement File No. 333-206365)

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION IN WHOLE OR IN PART IN, INTO OR FROM ANY JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OR REGULATIONS OF THAT JURISDICTION.

EXPLANATORY NOTE

Alcatel Lucent S.A. posted a hyperlink to the following Press Release of Nokia Corporation on its website.

Nokia announces that the offer period in its initial public exchange offer for Alcatel-Lucent securities has now closed

Nokia Corporation

Stock Exchange Release

December 23, 2015 at 18:35 (CET +1)

Nokia announces that the offer period in its initial public exchange offer for Alcatel-Lucent securities has now closed

Espoo, Finland – The initial offer period in Nokia’s public exchange offer (the “Offer”) for Alcatel-Lucent securities in both France and the United States has now closed. The deadline for tendering Alcatel-Lucent shares and OCEANEs into the Offer was 5:00 PM Paris time (11:00 AM New York City time) on December 23, 2015. The deadline for tendering Alcatel-Lucent ADSs into the U.S. Offer was 5:00 PM New York City time on December 22, 2015. Accordingly, holders of Alcatel-Lucent shares, ADSs and OCEANEs may no longer tender into the Offer and may not withdraw Alcatel-Lucent shares, ADSs or OCEANEs that have already been tendered.

Nokia expects that the interim results of the initial public exchange offer will be published by the French stock market authority, Autorité des Marchés Financiers (the “AMF”), on January 4, 2016, with the final results to be published on January 5, 2016. If the Offer is successful, it will be reopened. The AMF will publish the timetable of the reopened Offer, which is expected to start on January 14, 2016 and close on February 3, 2016.

The completion of the Offer is subject to the minimum tender condition that the Alcatel-Lucent securities tendered into the Offer represent more than 50% of the shares of Alcatel-Lucent on a fully diluted basis upon the closing of the Offer. In accordance with the applicable rules and regulations of the AMF and the U.S. Securities and Exchange Commission, and if the mandatory minimum acceptance threshold set at more than 50% of the Alcatel-Lucent share capital or voting rights on a non-diluted basis (taking into account Alcatel-Lucent convertible bonds tendered into the exchange offer) is crossed, Nokia reserves the right to waive the minimum tender condition of the Offer. A decision whether to invoke the waiver will be made by Nokia’s Board of Directors should that situation arise.

About Nokia

By focusing on the human possibilities of technology, Nokia embraces the connected world to help people thrive. Our businesses are leaders in their respective fields: Nokia Networks provides broadband infrastructure, software and services; and Nokia Technologies provides advanced technology development and licensing. www.nokia.com

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ENQUIRIES

Media Enquiries:

Nokia Communications

Tel. +358 (0) 10 448 4900

Email: press.services@nokia.com

Investor Enquiries:

Nokia Investor Relations

Tel. +358 4080 3 4080

Email: investor.relations@nokia.com

Microsite details

Further information on the transaction can be found at: www.newconnectivity.com

FORWARD-LOOKING STATEMENTS

This communication contains forward-looking statements that reflect Alcatel-Lucent’s current expectations and views of future events and developments. Some of these forward-looking statements can be identified by terms and phrases such as “anticipate,” “should,” “likely,” “foresee,” “believe,” “estimate,” “expect,” “intend,” “continue,” “could,” “may,” “plan,” “project,” “predict,” “will” and similar expressions. These forward looking statements are subject to a number of risks and uncertainties, many of which are beyond Alcatel-Lucent’s control, which could cause actual results to differ materially from such statements. These forward-looking statements are based on Alcatel-Lucent’s beliefs, assumptions and expectations of future performance, taking into account the information currently available to it. These forward-looking statements are only predictions based upon Alcatel-Lucent’s current expectations and views of future events and developments and are subject to risks and uncertainties that are difficult to predict because they relate to events and depend on circumstances that will occur in the future. Risks and uncertainties include: the ability to successfully implement the announced transaction with Nokia; the performance of the global economy; the capacity for growth in internet and technology usage; the consolidation and convergence of the industry, its suppliers and its customers; the effect of changes in governmental regulations; disruption from the proposed transaction making it more difficult to maintain relationships with customers, employees or suppliers; as well as other risk factors listed from time to time in Alcatel-Lucent’s or Nokia’s filings with the U.S. Securities and Exchange Commission (“SEC”) and or the Autorité des marchés financiers (“AMF”).

The forward-looking statements should be read in conjunction with the other cautionary statements that are included elsewhere, including the Risk Factors section of the Registration Statement (as defined below), Nokia’s and Alcatel-Lucent’s most recent annual report on Form 20-F, reports furnished on Form 6 K, and any other documents that Nokia or Alcatel-Lucent have filed with the SEC. Any forward-looking statements made in this communication are qualified in their entirety by these cautionary statements, and there can be no assurance that the actual results or developments anticipated by Alcatel-Lucent will be realized or, even if substantially realized, that they will have the expected consequences to, or effects on, Alcatel-Lucent or its business or operations. Except as required by law, Alcatel-Lucent undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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IMPORTANT ADDITIONAL INFORMATION

This communication relates to the public exchange offer by Nokia to exchange all of the ordinary shares, American Depositary Shares (“ADSs”) and convertible securities issued by Alcatel Lucent for new ordinary shares and ADSs of Nokia. This communication is for informational purposes only and does not constitute an offer to purchase or exchange, or a solicitation of an offer to sell or exchange, any ordinary shares, ADSs or convertible securities of Alcatel Lucent, nor is it a substitute for the Tender Offer Statement on Schedule TO or the Prospectus / Offer to Exchange, dated November 12, 2015 included in the Registration Statement on Form F-4 filed by Nokia with the SEC on November 12, 2015 (the “Registration Statement”), the Solicitation / Recommendation Statement on Schedule 14D-9 filed by Alcatel Lucent with the SEC, the listing prospectus of Nokia filed by Nokia with the Finnish Financial Supervisory Authority or the offer document (note d’information) filed by Nokia with the French Autorité des marchés financiers (“AMF”) or the response document (note en réponse) filed by Alcatel Lucent with the AMF (including the letters of transmittal and related documents and in each case as amended and supplemented from time to time, the “Exchange Offer Documents”). No offering of securities shall be made in the United States except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933. The exchange offer will be made only through the Exchange Offer Documents.

The making of the exchange offer to specific persons who are residents in or nationals or citizens of jurisdictions outside France or the United States or to custodians, nominees or trustees of such persons (the “Excluded Shareholders”) may be made only in accordance with the laws of the relevant jurisdiction. It is the responsibility of the Excluded Shareholders wishing to accept an exchange offer to inform themselves of and ensure compliance with the laws of their respective jurisdictions in relation to the exchange offer.

INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE EXCHANGE OFFER DOCUMENTS AND ALL OTHER RELEVANT DOCUMENTS THAT NOKIA OR ALCATEL LUCENT HAS FILED OR MAY FILE WITH THE SEC, AMF, NASDAQ HELSINKI OR FINNISH FINANCIAL SUPERVISORY AUTHORITY WHEN THEY BECOME AVAILABLE BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION THAT INVESTORS AND SECURITY HOLDERS SHOULD CONSIDER BEFORE MAKING ANY DECISION REGARDING THE EXCHANGE OFFER.

The information contained in this release must not be published, released or distributed, directly or indirectly, in any jurisdiction where the publication, release or distribution of such information is restricted by laws or regulations. Therefore, persons in such jurisdictions into which these materials are published, released or distributed must inform themselves about and comply with such laws or regulations. Nokia and Alcatel Lucent do not accept any responsibility for any violation by any person of any such restrictions.

The Exchange Offer Documents and other documents referred to above, if filed or furnished by Nokia or Alcatel Lucent with the SEC, as applicable, including the Registration Statement, are or will be available free of charge at the SEC’s website (www.sec.gov).

Nokia’s offer document (note d’information) and Alcatel Lucent’s response document (note en réponse), containing detailed information with regard to the French public exchange offer, are or will be available on the websites of the AMF (www.amf-france.org), Nokia (www.nokia.com) and Alcatel Lucent (www.alcatel-lucent.com), as applicable.

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