Shareholder structure

Shareholder structure & information on capital, voting securities and voting rights

History of capital

Ablynx NV publishes the following information in accordance with Article 15 of the Belgian Law of 2 May 2007 regarding the publication of major shareholdings in issuers whose securities are admitted to trading on a regulated market (the "Transparency Law"):

Ablynx NV has an aggregate of 3,568,076 outstanding warrants, 2,506,512 warrants of which entitle their holders to an aggregate of 1,253,256 shares (two warrants giving right to subscribe for one share) and 1,061,564 warrants of which entitle their holders to an aggregate of 1,061,564 shares (one warrant giving right to subscribe for one share). The aggregate number of voting rights that can be obtained upon exercise of the outstanding warrants amounts to 2,314,820.

Ablynx NV has not issued any other rights to subscribe for voting securities that have not yet been issued or any shares without voting rights.

The voting securities of Ablynx NV are not divided into categories.

The Articles of Association of Ablynx NV provide for an additional notification threshold of 3%.

This information is valid as of 21 April 2010. In accordance with the Transparency Law, changes to the information set out above will be published ultimately by the end of the calendar month during which the relevant change has occurred.

Shareholder structure

In accordance with Article 14 of the Belgian Transparency Law, Ablynx hereby publishes its shareholder structure.

Holdings as per 1 September 2008

Ablynx received the following notifications of holdings as per 1 September 2008. The denominator as per 1 September 2008 amounted to 36,438,959.

Holdings as per 18 March 2010

Ablynx received the following notifications of holdings as per 18 March 2010. The denominator as per 18 March 2010 amounted to 43,590,173.

Holdings as per 21 April 2010

Ablynx received the following notification of holding as per 21 April 2010. The current denominator as per 21 April 2010 amounted (and still amounts) to 43,601,797.

Shareholder structure as per 21 April 2010 – for information purposes only

Based on (i) the number of voting rights set out in the notifications received by Ablynx as per 1 September 2008 (following the entry into force of the Belgian Transparency Law), and (ii) the new number of voting rights set out in the notifications received by Ablynx as per 18 March 2010, and taking into consideration the current denominator (43,601,797), Ablynx hereby states, for information purposes only, that the shareholder structure would be the following:

Transparency notifications

• Press release - Transparency notification on 23 April 2010 on the situation as per 21 April 2010
  • Transparency Notification: KBC KBC Groep NV and KBC Private Equity NV
• Press release - Transparency notification on 25 March 2010 on the situation as per 18 March 2010
  • Transparency Notification: GIMV NV, Adviesbeheer GIMV Life Sciences NV, Adviesbeheer Gimv Life Sciences 2004 NV and Biotech Fonds Vlaanderen NV , C.H. Boehringer Sohn AG & Co. KG and Boehringer Ingelheim International GmbH , Multifund B.V., Nederlandia Investments B.V. and Stichting Avivia, KBC Groep NV and KBC Private Equity NV
• Denominator - Transparency notification
• Press release - Transparency notification on 5 November 2008 on the situation as per 1 September 2008,
  • Transparency Notification: Sofinnova Partners SAS , Abingworth Management Limited and Abingworth LLP , Alta California Partners IV, LP, Gilde Europe Food & Agribusiness, VIB VZW, KBC Asset Management NV
• Press release on shareholder notification, 24 April 2009
• Transparency notification of KBC Asset Management on 21/09/09

Article 15 of the Articles of Association of the Company has set the threshold requiring a transparency declaration at 3%, 5% and each subsequent multiple of 5%.