Avantium N.V.

Pre-Annual General Meeting Information • Apr 30, 2020

Additional information Annual General Meeting 2020 in view of COVID-19

AMSTERDAM, 29 April 2020, 17:30 CET – Following the Temporary Act COVID-19 Justice and Safety (the "Emergency-Act"), Avantium decided to make further changes to the organisation of its Annual General Meeting (AGM) as stated in this agenda and other meeting documents, published on April 2 2020. The AGM will only be electronically accessible for shareholders via a live webcast, made available on Avantium's website www.avantium.com. This means that the shareholders can interactively attend but will not be granted physical access to the meeting.

With the organisation of the live webcasted AGM, Avantium provides its shareholders the opportunity to interactively participate in the AGM and to exercise their shareholders' rights in line with the Emergency Act. The link to the live webcast of the AGM 2020 will be available on the homepage of the website of Avantium: www.avantium.com. Shareholders can ask questions by sending questions prior to the AGM to Avantium (as per the below instructions).

Record Date

Persons will be entitled to attend and vote at the AGM, provided they are registered as a shareholder of Avantium on Thursday 16 April 2020, after processing of all settlements of that date (the "Record Date") in one of the sub-registers designated by the Management Board. The sub-registers designated for holders of book-entry shares are the registers administered by the intermediaries, as referred to in the Securities Giro Act (Wet giraal effectenverkeer), indicating who is entitled to such shares on the Record Date and were registered, as described below. The register designated for holders of registered shares is Avantium's register of shareholders (as referred to in article 5 of Avantium's articles of association) on the Record Date.

Voting

Due to the orders imposed by the Dutch government in light of the COVID-19 (coronavirus) and Avantium's decision not to grant physical access for its shareholders, the only way shareholders can exercise their voting rights at the AGM is via (i) proxy, by using the physical form of power of attorney which can be found on Avantium's website or (ii) by giving voting instructions electronically via the ING EVO platform: https://ing.evo-platform.com/avantium. We have extended the deadline for submitting voting instructions and submitting written proxies until Monday 11 May 2020, 17.30 CEST. Both ways of voting are further described in the convocation notice of the AGM, as published on the website of Avantium https://www.avantium.com/corporate-governance/#shareholders-meeting.

Registration for electronic attendance

Shareholders who wish to electronically and interactively attend, must register via the ING EVO Platform: https://ing.evo-platform.com/avantium. This platform is available from Thursday 16 April 2020, after 18.00 CEST, until Monday 11 May 2020, 17.30 CEST, or via their intermediary where their

Avantium N.V., Zekeringstraat 29, 1014 BV Amsterdam, the Netherlands, +31 20 586 8080, P.O. Box 2915, 1000 CX, Amsterdam, the Netherlands, info@avantium.com, www.avantium.com, C of C: 34138918

shares are administered. The intermediaries must provide ING Bank N.V. no later than Monday 11 May 2020, 17.30 CEST with an electronic statement that includes the number of shares held by the relevant Shareholder on the Record Date and the number of shares which have been applied for registration. Upon registration, ING will issue a registration certificate for each Shareholder via the relevant intermediaries that serves as electronic attendance ticket for the AGM.

Questions

We want to encourage our shareholders to submit their questions regarding the various agenda items prior to the meeting. This is possible by sending an email to investorrelations@avantium.com or a letter to Avantium N.V., att. of Investor Relations, Zekeringstraat 29, 1014 BV Amsterdam, the Netherlands. The deadline for shareholders to submit questions prior to the AGM is Monday 11 May 2020 before 14.00 hours CET. Shareholders can ask additional follow-up questions during the live webcast, provided that the shareholder is registered in the EVO-platform, which registration must be done ultimately on Monday 11 May 2020, 17.30 CEST. Avantium may bundle questions and will endeavour to answer all questions during the AGM. The answers to the questions will be published on the company's website after the meeting.

About Avantium

Avantium is a leading technology development company and a forerunner in renewable chemistry. Avantium develops novel technologies based on renewable carbon sources as an alternative to fossilbased chemicals and plastics. The company currently has three technologies at pilot and demonstration phase. The most advanced technology is the YXY® plant-to-plastics–technology that catalytically converts plant-based sugars into a wide range of chemicals and plastics, such as PEF (polyethylene furanoate). Avantium has successfully demonstrated the YXY Technology® at its pilot plant in Geleen, the Netherlands. The second technology is the Dawn Technology™ that converts non-food biomass into industrial sugars and lignin in order to transition the chemicals and materials industries to non-fossil resources. In 2018, Avantium opened the Dawn Technology™ pilot biorefinery in Delfzijl, the Netherlands. The third technology is called Ray Technology™ and catalytically converts industrial sugars to plant-based MEG (mono-ethylene glycol). Avantium is scaling up its Ray Technology™ and the demonstration plant in Delfzijl, the Netherlands opened on November 7, 2019. Next to developing and commercialising renewable chemistry technologies, the company also provides advanced catalysis R&D services and systems to customers in the refinery and chemical industries. Avantium works in partnership with likeminded companies around the globe to create revolutionary renewable chemistry solutions from invention to commercial scale.

Avantium's shares are listed on Euronext Amsterdam and Euronext Brussels (symbol: AVTX). Avantium is included in the Euronext Amsterdam SmallCap Index (AScX). Its offices and headquarters are in Amsterdam, the Netherlands.

For more information:

Caroline van Reedt Dortland, Director Communications, Avantium +31-20-5860110 / +31-613400179, caroline.vanreedt-dortland@avantium.com