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, 5 February 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 two notifications of shareholdings from Marshall Wace LLP on 1 February 2018.

Marshall Wace LLP has notified Ablynx that on 26 January 2018 it has downward crossed the 3% threshold of voting rights of Ablynx and upward crossed the 3% threshold on 29 January 2018, now holding 2,639,561 voting securities of Ablynx, representing 3.52% of the current 75,065,990 outstanding voting rights of Ablynx.

The latest notification contains the following information:

• Reason for the notification: acquisition or disposal of voting securities or voting rights
• Notification by: a person that notifies alone (on behalf of certain funds and managed accounts for which it acts as investment manager)
• Persons subject to the notification requirement: Marshall Wace LLP
• Transaction date: 29 January 2018
• Threshold that is crossed: 3%
• Denominator: 75,065,990
• Details of the notification:

* Type of financial instrument: "American depository receipt and Contract for difference"

• Chain of controlled undertakings through which the holding is effectively being held: Marshall Wace LLP is not a controlled entity in respect of the exercise of the voting rights held in the issuer.
• Additional information: This disclosure is provided by Marshall Wace LLP which has been appointed as investment manager or trading adviser acting for and on behalf of certain funds and managed accounts. Marshall Wace LLP exercise voting rights at its own discretion, without specific instructions from third parties or affiliates.

             
More information is provided in the transparency notifications. Full versions of the transparency notifications are 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; Novartis; 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

Attachments:

http://www.globenewswire.com/NewsRoom/AttachmentNg/07a60dd8-8d91-42bf-9335-98df13425c53