14 January 2026

Key information relating to the reverse share split and change of ISIN

Oslo, Norway, 14 January 2026: Reference is made to the stock exchange announcement made by Oncoinvent ASA (the “Company“) on 8 January 2026 regarding the resolution by the Company’s extraordinary general meeting to carry out a reverse share split of the Company’s shares. Key information related to the reverse share split, including the relevant key dates that have been determined by the board of directors today in accordance with the resolution by the general meeting, is set out below:

  • Date on which the corporate action was made public: 18 December 2025
  • Reverse split ratio: 100:1, i.e. one hundred (100) old shares give one (1) new share
  • Last day including right: 16 January 2026
  • Ex-date: 19 January 2026
  • Record date: 20 January 2026
  • Date of approval: 8 January 2026

Following completion of the reverse share split, the par value of the Company’s shares will be increased from NOK 0.50 to NOK 50. Shareholders who do not own a number of shares which can be divided by 100 shall, in connection with the reverse share split, have their holdings rounded downwards, so that the shareholder receives a whole number of shares. Fractional shares will not be issued and the shareholders will not receive any compensation for the rounding. The fractional shares will be added together to whole shares and will be sold at the Oslo Stock Exchange. The net proceeds from the sale shall be donated to charity as determined by the board of directors.

In connection with the reverse share split, the Company’s shares will be transferred to a new ISIN.

Please note the following key information for the change of ISIN:

  • Issuer: Oncoinvent ASA
  • Previous ISIN for the Company’s shares: ISIN NO 0013251173
  • New ISIN for the Company’s shares: ISIN NO 0013711713 
  • Date of ISIN change: 19 January 2026

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For further information, please contact:

Oystein Soug, Chief Executive Officer
Email: soug@oncoinvent.com

About Oncoinvent

Oncoinvent is developing Radspherin®, a receptor-independent alpha radiation therapy that leverages the unique anatomy of the abdominal cavity to destroy residual micrometastases using a single, highly localized dose of alpha radiation. The initial clinical focus is treatment of ovarian and colorectal cancer patients after surgical removal of the primary tumor and visible metastases in the peritoneum, the thin membrane lining the abdominal cavity and covering the abdominal organs.

This radiopharmaceutical is designed to prevent or delay recurrence in the peritoneal cavity, keeping patients disease-free for longer than the current standard of care and thereby also impacting overall survival. It is broadly applicable to any cancer that spreads to the peritoneum, e.g. ovarian, colorectal, and gastric cancers. Radspherin® stands out for its simplicity, excellent safety profile, and seamless integration into existing surgical workflows. Oncoinvent’s product is easy to use, avoids systemic delivery and significant toxicity. It is also differentiated in being simple to manufacture, scalable, and supply de-risked.

Data from two trials in ovarian (phase 1) and colorectal (phase 1/2a) cancers, are highly promising, showing an excellent safety profile and meaningful signals of efficacy. Interim data from an ongoing, randomized, controlled phase 2 ovarian cancer trial is expected in 2026. With cost-effective manufacturing, blockbuster potential, active pharma partnership momentum, plus strong endorsements from leading experts, Oncoinvent is built for scale and commercial success, and is set to become the new standard for post-surgical cancer care. The Company was founded by the originators of Algeta and Xofigo (acquired by Bayer).

Øystein Soug

Chief Executive Officer

soug@oncoinvent.com

Oystein Soug has over 15 years of experience in biotechnology, holding several management positions. Most recently, Mr. Soug was CEO of Arxx Therapeutics, where he led the company to initiate the clinical programme and was responsible for the merger with Dutch pharma company Oxitope Pharma to create Calluna Pharma. Prior to Arxx, he served as CFO and then CEO of Targovax, an Oslo listed biotechnology company, which went public during Mr. Soug’s tenure. Mr. Soug started his career in biotech as CFO of Oslo-listed radiopharmaceutical company Algeta. During this period, the company conducted a successful phase 3 trial, launched its radium-223 based prostate cancer drug Xofigo® and out-licensed the drug. Mr. Soug co-led the sale of the company to Bayer in 2014.

Mr. Soug holds an MSc in Economics and
Financial Markets from Universität St. Gallen in Switzerland in 1997

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Anders Månsson

Chief Executive Officer

mansson@oncoinvent.com

Anders Månsson is a business executive with over 25 years of experience from management roles in the pharmaceutical industry, focusing on commercialisation and M&A + licensing. Mr. Månsson has held leading roles in the industry both in his native Sweden and in other European countries, and he has worked extensively with the USA and Asia as focus markets in global roles.

Mr. Månsson holds a B.Sc. degree in Business & Economics from Lund’s University in Sweden as well as an MBA from Business School Lausanne in Switzerland. He has a broad-based industrial experience, featuring both large multinational companies such as Meda, Ferring & LEO Pharma, and including leading roles in start-ups and smaller biotech companies. On top of his executive role in Oncoinvent, Mr. Månsson holds two non-executive director positions serving on the board of EQL Pharma AB as well Immetric AB, the latter being an investment company focusing on life science.

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