Modification of Solvay Shareholders' Meetings' organizational arrangements due to Covid-19

Given the exceptional situation relating to the COVID-19 pandemic, Solvay's priority is to maintain the good health and safety of its shareholders, employees and other stakeholders. To this end, in accordance with Royal Decree n°4 of 9 April 2020 on various company law provisions in the context of the fight against the Covid-19 pandemic, it has been decided to modify the organisation of the Ordinary and Extraordinary General Meetings of Tuesday 12 May 2020 at 10.30 a.m.

Meetings without physical presence of shareholders and with video webcast

The new terms and conditions are specified in the updated notice of meeting, which is accessible in the 2020 General Meetings section of the website: https://www.solvay.com/en/investors/financial-calendar-events-presentations/shareholders-meetings/2020-shareholders-meeting

Shareholders' Meetings will be held without the physical presence of shareholders, and will be broadcasted live on Solvay's Internet site in the form of a webcast available for shareholders.

This broadcast will not allow live voting. Shareholders will only be able to vote remotely before Shareholders' Meetings, by mail or by giving a proxy to Solvay (or a person designated by its Board of Directors).

Exercising voting rights

Postal voting and proxy forms are available in the 2020 General Meetings: https://www.solvay.com/en/investors/financial-calendar-events-presentations/shareholders-meetings/2020-shareholders-meeting

There are no changes related to the agenda items and motions for resolutions.

For shareholders who have sent a validly completed proxy with voting instructions for the benefit of a third party, the votes or abstentions expressed in such proxy will be taken into account, without needing the proxy holder's presence or the shareholder having to complete an additional form.

For shareholders who have not yet sent their voting form or proxy by the date of this press release, we kindly ask them to only use the updated forms available at the above-mentioned website address.

Right to ask questions

Shareholders are of course still entitled to ask questions, but only in writing prior to the Shareholders' Meetings, by ordinary mail or by e-mail to [email protected]. These questions will be answered orally at the Meetings during the live broadcast. It will not be possible to ask additional questions during the webcast.

Proxy forms, postal voting forms and questions relating to items on the agenda must reach Solvay no later than Friday, May 8, 2020.

Practical webcast terms

As indicated above, shareholders will be able to follow Solvay Shareholders' Meetings on the internet via a webcast. Shareholders wishing to follow the webcast are invited to register to the virtual event in the Shareholders' Meetings 2020 section of the website.

The information requested from shareholders to access the video broadcast of the Meetings constitutes "personal data" concerning the shareholders and will be processed by Solvay SA (Rue de Ransbeek 3010, 1120 Brussels), acting as the data controller. To this end, Solvay relies on its legitimate interest in managing and securing the video retransmission mentioned above and will only keep the shareholders' personal data until the next Meeting. Solvay will process the personal data of shareholders in accordance with its Privacy Policy, available online via the following link: https://www.solvay.com/en/information/data-protection-and-privacy-policy.html. This Policy contains in particular explanations concerning your rights relating to the processing of your personal data by Solvay (including the right to access and rectify your personal data as well as, in certain cases, the right to be forgotten , the right to limit processing, the right to data portability and the right to object to processing).

This webcast must not be interpreted as an offer, an invitation to offer or a solicitation, or as advice or a recommendation to buy, subscribe, issue or sell Solvay securities.

About Solvay

Solvay is a science company whose technologies bring benefits to many aspects of daily life. With more than 24,100 employees in 64 countries, Solvay bonds people, ideas and elements to reinvent progress. The Group seeks to create sustainable shared value for all, notably through its Solvay One Planet plan crafted around three pillars: protecting the climate, preserving resources and fostering better life. The Group's innovative solutions contribute to safer, cleaner, and more sustainable products found in homes, food and consumer goods, planes, cars, batteries, smart devices, health care applications, water and air purification systems. Founded in 1863, Solvay today ranks among the world's top three companies for the vast majority of its activities and delivered net sales of €10.2 billion in 2019. Solvay is listed on Euronext Brussels (SOLB) and Paris and in the United States, where its shares (SOLVY) are traded through a Level I ADR program. Learn more at www.solvay.com.

Investors relations Media relations

Jodi Allen, Head of Investor relations Nathalie Van Ypersele +1 609 860 4608 +32 478 20 10 62

Geoffroy d'Oultremont +32 2 264 29 97 Brian Carroll

+32 2 264 36 87

Valérie-Anne Barriat +32 2 264 1622

[email protected]

+32 2 264 36 72 Bisser Alexandrov [email protected]

Sir, Madam,

We have the honor of informing you of the holding of the Ordinary and Extraordinary Shareholders' Meetings of Solvay SA which will be held on Tuesday May 12, 2020 at 10.30 am. (Belgian time) at Solvay SA, 310 rue de Ransbeek at 1120 Brussels. This convening notice is an update of the original convening notice of April 10, following the adoption by the government of measures in the framework of the fight against the Covid-19 pandemic.

In view of the exceptional situation linked to the coronavirus, the modalities of participation for the Shareholders' Meetings have been adapted in accordance with the Royal Decree of 9 April 2020 containing various provisions on company law in the framework of the fight against the Covid-19 pandemic (the "Royal Decree"). Shareholders will not be able to participate physically in the Meetings and will only be able to exercise their rights by postal voting or by proxy. Postal voting or proxy forms should be sent to the company, in accordance with the modalities of participation, as defined at the end of the convening notice.

The agenda of the Meetings, which is identical to the one in the convening notice dated April 10, is attached as a well as a board report on the use and purpose of the authorized capital prepared in accordance with Article 7:199 of the Belgian Companies and Associations Code.

PROCEDURES NECESSARY FOR VOTING AT THE ORDINARY AND EXTRAORDINARY SHAREHOLDERS' MEETINGS ON MAY 12, 2020, UPDATED FOLLOWING THE PRESS RELEASE OF SOLVAY SA OF APRIL 27, 2020

1) Holders of registered shares

Voting at the Shareholders' Meetings involves a twofold procedure: on the one hand, your shares will be submitted to a registration procedure entering them in the account of registered shares of Solvay SA on Tuesday 28 April 2020 at midnight and, on the other hand, you must confirm your desire to vote at the Shareholders' Meetings at the latest on May, 8, 2020. Delivery of a proxy or voting form within the above-mentioned time limit will constitute notification. No further action will be required in this regard.

Only those people who are shareholders of Solvay SA as of midnight (Belgian time) on Tuesday 28 April 2020 (hereafter called the "record date") will have the right to vote at the Meetings on May 12, 2020, regardless of the number of shares held by the shareholders on the day of the Shareholders' Meetings.

2) Holders of dematerialized shares

If you plan to vote at the Meetings, you will have to produce a statement from the authorized account holder or from the settlement organization that holds your share account, certifying the number of dematerialized shares registered in your name on the record date, which is Tuesday 28 April, 2020 at midnight, and for which you have indicated your desire to vote at the Shareholders' Meetings of May 12, 2020.

Only those people who are shareholders of Solvay SA as of midnight (Belgian time) on Tuesday 28 April 2020 have the right to vote at the Meetings on Tuesday May 12, 2020, regardless of the number of shares held by the shareholders on the day of the Shareholders' Meetings.

Holders of dematerialized shares who wish to vote at the Shareholders' Meetings of May 12, 2020 must notify their intention to the company no later than May 8, 2020. They may, if applicable, instruct one of the financial institutions mentioned above to confirm to Solvay SA their intention to vote at the Shareholders' Meetings simultaneously with the notification of their registration.

VOTE BY CORRESPONDENCE – PROXY VOTING

Shareholders may submit a vote by correspondence in accordance with article 6, §1, of the Royal Decree. Votes by correspondence must be cast on the form prepared by Solvay SA. This form can be obtained on the website of the company https://www.solvay.com/en/investors/financial-calendar-events-presentations/shareholdersmeetings/2020-shareholders-meeting or through the above-mentioned financial institutions. The duly completed and signed vote by correspondence form must reach Solvay SA at the latest on Friday, May 8, 2020 via regular mail or via e-mail. In the case of sending via e-mail, a scanned or photographed copy of the completed and signed voting form should be sent to the company.

Shareholders may also be represented by a proxy holder. In accordance with the Royal Decree, this proxy may only be given to the company (or any other person designated by the company). Shareholders are requested to use the proxy forms available on the website of the company https://www.solvay.com/en/investors/financial-calendar-eventspresentations/shareholders-meetings/2020-shareholders-meeting or through the above-mentioned financial institutions. Signed proxies must reach Solvay SA at the latest on Friday, May 8, 2020 via regular mail or via e-mail. In the case of sending via e-mail, a scanned or photographed copy of the completed and signed proxy form should be sent to the company.

These documents may be sent to Solvay SA, either by regular mail to the corporate headquarters: Solvay SA, Assemblée Générale, 310 rue de Ransbeek at 1120 Brussels, or by fax to +32-(0)2.264.37.67, or electronically to the e-mail address: [email protected].

Validly completed proxies with specific voting instructions that have already been sent to the company will be taken into account, without the need for the proxyholder to be present or for the shareholder to complete an additional form.

WEBCAST

The company will organize a live broadcast of the Meetings on the internet in audio format (webcast). Shareholders are invited to consult the company's website https://www.solvay.com/en/investors/financial-calendar-eventspresentations/shareholders-meetings/2020-shareholders-meeting for information on how to access this broadcast.

RIGHT TO ASK QUESTIONS

In accordance with Article 6, §3, of the Royal Decree, shareholders who complied with the above conditions for admission, may also submit questions in writing relating to items on the agenda to the directors and/or the statutory auditor.

It will not be possible for shareholders to ask questions during the Meetings.

Answers to questions in writing will be provided during the live broadcast of the Meetings as explained above.

Questions in writing will only be answered if the shareholder asking them has complied with the above admission conditions and if the questions in writing have been received by Solvay SA at the latest on Friday May 8, 2020, either by regular mail to the address of its corporate headquarters: Solvay SA, Assemblée Générale, 310 rue de Ransbeek at 1120 Brussels, or by fax to +32-(0)2.264.37.67, or by electronic mail to the e-mail address: [email protected].

AVAILABILITY OF DOCUMENTS

All documents relating to the Shareholders' Meetings which the law requires to make available to shareholders are accessible on Solvay's website https://www.solvay.com/en/investors/financial-calendar-eventspresentations/shareholders-meetings/2020-shareholders-meeting as from the publication of this convening notice.

DATA PROTECTION

Solvay is responsible for the processing of the personal information that it receives from shareholders in the context of the Meetings in accordance with applicable data privacy laws. Such information will be used for the purposes of analyzing and administrating the attendance and voting process in connection with the Meetings, as set out in this convening notice, and will be transferred to third parties assisting the Company for the above purposes. This information will not be kept longer than necessary for these purposes. Shareholders can consult the "Data Protection and Privacy Policy" with the link https://www.solvay.com/en/information/data-protection-and-privacy-policy.html. They may request access to their data and any additional modification by contacting Mrs. Michèle Vervoort, Solvay SA, 310, rue de Ransbeek - 1120 Brussels (Belgium) (tel: +32 (0) 2 264 15 32 / e-mail: [email protected]

We draw your attention to the fact that the motions for resolutions will be submitted for electronic votes. Proxy votes will be counted in advance and systematically recorded for each point. It should be recalled that one share is equal to one vote.

We send you our best regards.

Nicolas Boël Chairman of the Board of Directors

Useful information: Solvay SA Assemblée Générale – General Shareholders' Meeting 310 rue de Ransbeek 1120 Brussels Fax: +32-(0)2.264.37.67 E-mail: [email protected] Enterprise number : 0403.091.220 (RPM Brussels) Website: http://www.solvay.com/en/investors/shareholders-meeting/index.html

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