Summary of subscription of Y series shares - supplement to current report no. 12/2026 of 19 March 2026

Current report no. 25/2026

Drafting date: 6 May 2026

Subject: Summary of subscription of Y series shares - supplement to current report no. 12/2026 of 19 March 2026

Legal basis: Section 17(1) of the Regulation of the Minister of Finance on current and periodic information disclosed by issuers of securities and the conditions for recognizing as equivalent information required by the laws of a non-Member State, dated 6 June 2025 (Journal of Laws of 2025, item 755)

The Management Board of Captor Therapeutics S.A., with its registered office in Wrocław (the “Company”), as a supplement to current report no. 12/2026 of 19 March 2026, announces information on the costs related to the subscription of ordinary bearer shares of series Y.

The amount of the total costs that were included in the costs of the issue, indicating the amount of the costs by their titles, broken down at least into:

a) preparation and conduct of the offer:

The costs of preparing and conducting the offering of ordinary bearer shares of series Y amounted to approximately PLN 1,419 thousand net.

b) underwriters' remuneration, for each separately:

Not applicable.

c) preparation of the prospectus, including costs of advisory services.

Not applicable.

d) promotion of the offer

Not applicable.

The total costs mentioned above amounted to approximately PLN 1,419 thousand net

Method of accounting for the costs and their recognition in the issuer's financial statements:

The costs incurred by the Company for the issue of the Company's series Y ordinary bearer shares were accounted for in the Company's books of account and in the Company's financial statements as follows:

The costs incurred by the Company, amounting to approximately PLN 1,419 thousand net, were deducted from the Company's capital reserve (agio) created from the excess of the issue value of the issued shares over their nominal value.

The average cost of carrying out the subscription or sale per unit of security subject to subscription or sale:

The average cost of carrying out the subscription or sale of the Company's shares per unit of security subscribed or sold was approximately PLN 1.77