Institut IGH d.d.

Post-Annual General Meeting Information • Oct 31, 2025

Ordinary share IGH-R-A, ISIN HRIGH0RA0006 Listed on the official market of the Zagreb Stock Exchange Home Member State: Croatia LEI mark: 74780000W0UQ8MF2FU71

ZAGREB STOCK EXCHANGE HANFA HINA Ivana Lučića 2a Miramarska 24b ots@hina.hr 10000 Zagreb 10000 Zagreb

Zagreb, 30. october 2025

The Supervisory Board of the company INSTITUT IGH, joint-stock company for research and development in civil engineering, with the address Janka Rakuše 1 in Zagreb, registered at the Commercial court in Zagreb, MBS: 080000959, OIB: 79766124714 (hereinafter: the Company), announces that on October 30th 2024., on its 13 th Supervisory Board session has considered and adopted the decision on the plan of corporate activities for the year 2026.

INSTITUT IGH, JSC

INSTITUT IGH, d.d. Janka Rakuše 1 10000 Zagreb, Croatia

PHONE: +385 (0)1 612 51 25 EMAIL: igh@igh.hr WEB: www.igh.hr

Business bank:

KentBank d.d. IBAN: HR48 4124 0031 1990 1793 2 SWIFT code: KENBHR22

Reg.No.: 3750272 PIN: 79766124714

Competent court:

Commercial Court in Zagreb Register entry with company registration No. 080000959

Share capital:

EUR 14,814,630.00, Paid in full

No. of issued shares: IGH 1,481,463 Nominal share value EUR 10

Management Board:

Mariyan Tkach, President of the Management Board Bariša Pavičić, Member of the Management Board Gerhard Sattler Vukadinović, Member of the Management Board

INSTITUT IGH, d.d. Zagreb, Janka Rakuše 1 SUPERVISORY BOARD Number: 00-2025/13-6

Supervisory Board of the company INSTITUT IGH, d.d. at its 13th session held on October 30th 2025.,

adopted the following

DECISION

The Plan of Corporate Activities for the year 2026 is adopted as follows:

• a. The schedule of the Supervisory Board sessions:
• 15 th session 27.2.2026.
• 16 th session 29.4.2026.
• 17 th session 27.7.2026.
• 18 th session 29.10.2026.
• 19 th session 17.12.2026.

The regular General Assembly session will be held on 27.7.2026.

• b. Schedule for publication of the Company's financial statements
• 1. Interim unaudited unconsolidated and consolidated financial reports for the fourth quarter of the business year 2025. – date of publication: 27.2.2026.
• 1. Audited unconsolidated and consolidated financial reports for the business year 2025. date of publication: 29.4.2026.
• 1. Unaudited unconsolidated and consolidated financial reports for the first quarter of the business year 2026. – date of publication: 29.4.2026.
• 1. Unaudited unconsolidated and consolidated financial reports for the first half of the business year 2026. – date of publication: 27.7.2026.
• 1. Unaudited unconsolidated and consolidated financial reports for the third quarter of the business year 2026 – date of publication: 29.10.2026.".

Chairman of the Supervisory Board Žarko Dešković