PUBLICATION IN ACCORDANCE WITH ARTICLE 14 OF THE BELGIAN LAW OF 2 MAY 2007 REGARDING THE PUBLICATION OF MAJOR SHAREHOLDINGS (THE "TRANSPARENCY LAW")

REGULATED INFORMATION

GHENT, Belgium, 21 March 2018 - Ablynx [Euronext Brussels and Nasdaq: ABLX] today announced, in accordance with Article 14 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"), that it received a notification of shareholdings from Van Herk Investments B.V. on 19 March 2018.

Van Herk Investments B.V. notified Ablynx that it has downward crossed the 5% threshold on 16 March 2018 and now holds 3,730,065 voting securites of Ablynx, representing 4.96% of the current 75,253,667 outstanding voting rights of Ablynx (versus 9.93% notified previously on 12 February 2018).

The notification contains the following information:

• Reason for the notification: acquisition or disposal of voting securities or voting rights
• Notification by: a parent undertaking or a controlling person
• Persons subject to the notification requirement: Mr. A. van Herk, Van Herk Investments B.V.
• Transaction date: 16 March 2018
• Threshold that is crossed: 5%
• Denominator: 75,253,667
• Details of the notification: Van Herk Investments B.V. holds 3,730,065 voting securities of Ablynx
• Chain of controlled undertakings through which the holding is effectively being held: Van Herk Investments B.V. is controlled by Mr. A. van Herk in accordance with Articles 5 and 7 of the Dutch Companies Code.

A full version of the transparency notification is available on Ablynx website, under the section Investors.

The articles of the association of Ablynx NV provide for shareholders notification threshold of 3%, 5% or a multiple of 5% of the total number of existing voting rights.

About Ablynx

Ablynx is a biopharmaceutical company engaged in the development of Nanobodies, proprietary therapeutic proteins based on single-domain antibody fragments, which combine the advantages of conventional antibody drugs with some of the features of small-molecule drugs. Ablynx is dedicated to creating new medicines which will make a real difference to society. Today, the Company has more than 45 proprietary and partnered programmes in development in various therapeutic areas including inflammation, haematology, immuno-oncology, oncology and respiratory disease. The Company has collaborations with multiple pharmaceutical companies including AbbVie; Boehringer Ingelheim; Eddingpharm; Merck & Co., Inc., Kenilworth, New Jersey, USA; Merck KGaA; Novo Nordisk; Sanofi and Taisho Pharmaceuticals. The Company is headquartered in Ghent, Belgium. More information can be found on www.ablynx.com.

For more information, please contact
Ablynx:
Dr Edwin Moses
CEO
t:   +32 (0)9 262 00 07
m: +32 (0)473 39 50 68
e:  [email protected]

Lies Vanneste
Director Investor Relations
t:   +32 (0)9 262 01 37
m: +32 (0)498 05 35 79
e:  [email protected]

Follow us on Twitter @AblynxABLX

Ablynx media relations:
Consilium Strategic Communications
Mary-Jane Elliott, Philippa Gardner, Sukaina Virji
t:  +44 (0)20 3709 5700
e:  [email protected]

Joele Frank, Wilkinson Brimmer Katcher
Dan Katcher or Joseph Sala
t:  +1 212-355-4449

Attachment:

http://www.globenewswire.com/NewsRoom/AttachmentNg/0f0dcf34-6c25-422a-be80-98a5fba72649