In connection with the Rights Issue, the Company has prepared the Information Document in accordance with article 1.4 db Regulation (EU) 2017/1129 of the European Parliament and of Counsil of 14 June 2017 on the prospectus to be published when securities are offered to the public or admitted to trading on a regulated market, and repealing Directive 2003/71/EC (the "Prospectus Regulation"). The Information Document has been drafted in accordance with Annex IX of the Prospectus Regulation.

Today, Cantargia announces that the Information Document has been registered with the Swedish Financial Supervisory Authority (Sw. Finansinspektionen) and made available on the Company's website, www.cantargia.com.

Timetable for the Rights Issue

Advisors
DNB Carnegie Investment Bank AB acts as Sole Global Coordinator and Sole Bookrunner in connection with the Rights Issue. Setterwalls Advokatbyrå AB is legal adviser to the Company.

For further information, please contact
Hilde Steineger, CEO
Telephone: +46 (0)46-275 62 60
E-mail: info@cantargia.com

The information was submitted for publication, through the agency of the contact person set out above, at 8.15am CEST on 5 June 2026.

About Cantargia

Cantargia AB (publ), reg. no. 556791-6019, is a biotechnology company that develops antibody-based treatments for life-threatening diseases and has established a platform based on the protein IL1RAP, involved in a number of cancer forms and inflammatory diseases. Cantargia’s oncology program, the antibody nadunolimab (CAN04), is being studied clinically, primarily in combination with chemotherapy with a focus on pancreatic cancer and non-small cell lung cancer. Positive data for the combinations indicate stronger efficacy than would be expected from chemotherapy alone. Cantargia’s second development program, the antibody CAN10, blocks signaling via IL1RAP in a different manner than nadunolimab and addresses treatment of serious autoimmune/inflammatory diseases. In September 2025, the acquisition of CAN10 by Otsuka Pharmaceutical was completed.

Cantargia is listed on Nasdaq Stockholm (ticker: CANTA). More information about Cantargia is available at www.cantargia.com.

Important information
Publication, release, or distribution of this press release may in certain jurisdictions be subject to legal restrictions and persons in the jurisdictions where the press release has been made public or distributed should be informed of and follow such legal restrictions. The recipient of this press release is responsible for using this press release and the information herein in accordance with applicable rules in each jurisdiction. This press release does not constitute an offer or solicitation to buy or subscribe for any securities in Cantargia AB (publ) in any jurisdiction, either from Cantargia AB (publ) or from anyone else.

This press release is not a prospectus for the purposes of the Prospectus Regulation and has not been approved by any regulatory authority in any jurisdiction. No prospectus will be prepared in connection with the Rights Issue. The Company has prepared the Information Document in the form provided for in Annex IX of the Prospectus Regulation. The Information Document is available on the Company’s website, www.cantargia.com. The Swedish Financial Supervisory Authority, which is the national competent authority, has not approved nor reviewed the Information Document. Each investor is advised to make their own assessment of whether it is appropriate to invest in the Company.

This press release does not constitute an offer or solicitation to buy or subscribe for securities in the United States. The securities mentioned herein may not be sold in the United States without registration, or without an exemption from registration, under the U.S. Securities Act from 1933 (“Securities Act”), and may not be offered or sold within the United States without being registered, covered by an exemption from, or part of a transaction that is not subject to the registration requirements according to the Securities Act. There is no intention to register any securities mentioned herein in the United States or to issue a public offering of such securities in the United States. The information in this press release may not be released, published, copied, reproduced or distributed, directly or indirectly, wholly or in part, in or to the United States, Australia, Belarus, Hong Kong, Japan, Canada, New Zealand, Russia, Singapore, Switzerland, South Africa, South Korea or any other jurisdiction where the release, publication or distribution of this information would violate current rules or where such an action is subject to legal restrictions or would require additional registration or other measures beyond those that follow from Swedish law. Actions in contravention of this instruction may constitute a violation of applicable securities legislation.

In the United Kingdom, this document and any other materials in relation to the securities described herein is only being distributed to, and is only directed at, and any investment or investment activity to which this document relates is available only to, and will be engaged in only with, "qualified investors" who are (i) persons having professional experience in matters relating to investments who fall within the definition of "investment professionals" in Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (the "Order"); or (ii) high net worth entities falling within Article 49(2)(a) to (d) of the Order (all such persons together being referred to as "relevant persons"). In the United Kingdom, any investment or investment activity to which this communication relates is available only to, and will be engaged in only with, relevant persons. Persons who are not relevant persons should not take any action on the basis of this press release and should not act or rely on it.

Please note that an investment in the Company is subject to regulation under the Swedish Screening of Foreign Direct Investments Act (Sw. lagen (2023:560) om granskning av utländska direktinvesteringar), which requires investors, under certain conditions, to notify and obtain approval from the Swedish Inspectorate for Strategic Products. Investors should make their own assessment of whether a notification obligation exists before making any investment decision.

Forward-looking statements
This press release contains forward-looking statements related to the Company's intentions, estimates or expectations with regard to the Company's future results, financial position, liquidity, development, outlook, estimated growth, strategies and opportunities as well as the markets in which the Company is active. Forward-looking statements are statements that do not refer to historical facts and can be identified by the use of terms such as “believes”, “expects”, “anticipates”, “intends”, “estimates”, “will”, “may”, “implies”, “should”, “could” and, in each case, their negative, or comparable terminology. The forward-looking statements in this press release are based on various assumptions, which in several cases are based on further assumptions. Although the Company believes that the assumptions reflected in these forward-looking statements are reasonable, there is no guarantee that they will occur or that they are correct. Since these assumptions are based on assumptions or estimates and involve risks and uncertainties, actual results or outcomes may, for many different reasons, differ materially from those stated in the forward-looking statements. Due to such risks, uncertainties, eventualities and other significant factors, actual events may differ materially from the expectations that expressly or implicitly are contained in this press release through the forward-looking statements. The Company does not guarantee that the assumptions which serve as a basis for the forward-looking statements in this press release are correct, and each reader of the press release should not rely on the forward-looking statements in this press release. The information, opinions and forward-looking statements that expressly or implicitly are stated herein are provided only as of the date of this press release and may change. Neither the Company nor any other party will review, update, confirm or publicly announce any revision of any forward-looking statement to reflect events that occur or circumstances that arise with respect to the contents of this press release, beyond what is required by law or Nasdaq Stockholm’s Rulebook for Issuers.

Potential investors should not put undue trust in the forward-looking statements herein, and potential investors are strongly recommended to read the sections in the disclosure document that include a more detailed description of the factors that can affect the Company’s business and its associated market.