TRANSPARENCY DECLARATION - PARTICIPATION NOTIFICATION BY BLACKROCK INC.

Brussels, Wednesday February 21, 2018, 8h00 CET --- According to Belgian transparency legislation (Law of May 2, 2007), BlackRock . (55 East 52nd Street, New York, NY, 10055, U.S.A.) has notified Solvay S.A. that:

• On February 15, 2018 BlackRock . crossed the 5% statutory threshold upwards with 4.41% of the total voting rights and 0.68% of equivalent financial instruments, or a total of 5.09%.

Declarations by BlackRock . are published in the Investor Relations Section of Solvay 's website.

For the complete press release, please read the enclosed PDF.

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Solvay is a multi-specialty chemical company, committed to developing chemistry that addresses key societal challenges. Solvay innovates and partners with customers in diverse global end markets. Its products and solutions are used in planes, cars, smart and medical devices, batteries, in mineral and oil extraction, among many other applications promoting sustainability. Its lightweighting materials enhance cleaner mobility, its formulations optimize the use of resources and its performance chemicals improve air and water quality. Solvay is headquartered in Brussels with around 27,000 employees in 58 countries. Net sales were € 10.9 billion in 2016, with 90% from activities where Solvay ranks among the world's top 3 leaders. Solvay SA (SOLB.BE) is listed on Euronext Brussels and Paris (Bloomberg: SOLB.BB - Reuters: SOLB.BR) and in the United States its shares (SOLVY) are traded through a level-1 ADR program.

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