Petroleum

Subsidiaries
As of Dec 31, 2025
IRPC Oil Company Limited
Refined product distribution
99.99% Shareholding
Indirect Subsidiaries
As of Dec 31, 2025
Rakpasak Company Limited
Oil tanker rental services, fertilizer manufacturer and distributor
99.99% Shareholding
Other Investment
As of Dec 31, 2025
Rayong Acetylene Company Limited
Production and distribution of acetylene gas
13.04% Shareholding

Petrochemical

Subsidiaries
As of Dec 31, 2025
Innopolymed Company Limited (1)

(Other joint venture partner: Innobic (Asia) Co., Ltd. 40%)

Production and Distribution of nonwoven fabric product and medical consumabless
60.00% Shareholding
IRPC A&L Company Limited

(Other joint venture partners: Nippon A&L Co., Ltd. 39.99%, others 2.53%)

Distribution of polymers
57.48% Shareholding
Joint Venture
As of Dec 31, 2025
IRPC Polyol Company Limited

(Other joint venture partner: PCC Rokita SA 50%)

Production and distribution of polyol products
50.00% Shareholding
Mytex Polymer (Thailand) Company Limited

(Other joint venture partner: Japan Polychem Corporation 50%)

Production and distribution of chemicals
50.00% Shareholding
Associate Company
As of Dec 31, 2025
UBE Chemicals (Asia) Public Company Limited

(Other joint venture partners: UBE Corporation 74%, others 1%)

Production and distribution of petrochemical products
25.00% Shareholding
Other Investment
As of Dec 31, 2025
Guangzhou Saiju Performance Polymer Ltd.
Distribution of polymers and chemicals through e-commerce in China
15.00% Shareholding

Other Businesses

Subsidiaries
As of Dec 31, 2025
IRPC Technology Company Limited
Vocational school
99.99% Shareholding
Joint Venture
As of Dec 31, 2025
Vajira Lab for Society Company Limited

(Other co-investor: Navamindradhiraj University 50%)

Laboratory testing and certification services for medical devices
50.00% Shareholding
WHA Industrial Estate Rayong Company Limited (2)

(Other joint venture partners: WHA Industrial Development Public Company Limited, 60%)

Industrial estate development
40.00% Shareholding
Associate Company
As of Dec 31, 2025
IRPC Clean Power Company Limited

(Other joint venture partners: Global Power Synergy Public Company Limited 51%)

Production and distribution of electricity and steam
48.99% Shareholding
Cleantech and Beyond Company Limited

(Other joint venture partners: VISUP Company Limited 72.72%)

Production of chemical products
27.28% Shareholding
VISUP Company Limited

(Other joint venture partners: Vidyasirimedhi Institute 33.33%, PTT PCL. 22.22%, Top Ventures Co., Ltd. 11.11%, Beacon Venture Capital Co., Ltd. 11.11%)

Investment in other businesses
22.22% Shareholding
Other Investment
As of Dec 31, 2025
Sarn Palung Social Enterprise Company Limited
Support execution of social enterprise
15.00% Shareholding

Notes: Only companies with ongoing operations are shown.

(1) On 21 May 2025, the Company’s Board of Directors resolved to approve the dissolution of Innopolymed Company Limited (IMD) and on 10 June 2025, an extraordinary shareholders’ meeting of IMD passed a resolution to approve the dissolution. The registration of dissolution was completed in 2025.

(2) On 25 November 2025, the Company’s Board of Directors resolved to approve the disposal of investment in WHA Industrial Estate Rayong Company Limited (WHAIER) to WHA Industrial Development Public Company Limited (WHAID) at the proportion of 40%, which is the entire shareholding held by the Company. The transaction is expected to be completed within the first quarter of 2026.