Common use of Investments in Subsidiaries Clause in Contracts

Investments in Subsidiaries. Investments in subsidiaries in the separate financial statements which use the cost method are as follows : Country of Company's name Nature of business incorporation Paid-up capital Shareholding percentage (%) Cost method (Baht) As at June As at December As at June As at December As at June As at December 30, 2021 31, 2020 30, 2021 31, 2020 30, 2021 31, 2020 Company Limited TRC Investment Limited* infrastructure Holding company The Republic of Baht 1 USD Baht 1 USD 100.00 100.00 32 32 Mauritius TRC Utility Company Limited Olive Technology To produce and distribute tap water Data management and Thailand Thailand 250,000 Baht 850,000 250,000 Baht 250,000 99.97 49.97 99.97 49.97 249,925 424,745 249,925 124,925 Company Limited processing Baht Baht Total 621,569,393 621,269,573 Less : Allowance for loss on impairment of investment (145,071,416) (145,071,416) Total investments in subsidiaries - net 476,497,977 476,198,157 * The financial statements of the subsidiary were prepared by the management of the subsidiary and not reviewed by other auditors. TRC CONSTRUCTION PUBLIC COMPANY LIMITED AND ITS SUBSIDIARIES NOTES TO INTERIM FINANCIAL STATEMENTS (CONT.) JUNE 30, 2021 Olive Technology Company Limited During January 14-18, 2021, Olive Technology Company Limited. had received the capital increase fund from the shareholders amounted Baht 0.60 million, or 60%. Details of investments in subsidiaries which are held by the Company’s subsidiaries are as follows: Nature Country of Company's name of business incorporation Paid-up capital Shareholding percentage (%) Cost method (Baht) Held by Sahakarn Wisavakorn Company Limited As at June 30, 2021 As at December 31, 2020 As at June 30, 2021 As at December 31, 2020 As at June 30, 2021 As at December 31, 2020 Hydrotek Sahakarn Joint Venture Construction services Thailand 1,000,000 Baht 1,000,000 Baht 49.00 49.00 490,000 490,000 Saha Hydro Pattaya Joint Venture Held by TRC Investment Limited Construction services Thailand 200,000 Baht - 100.00 - 200,000 - TRC International Limited* Held by TRC International Limited TRC Middle East LLC* Holding company Construction services Hong Kong Sultanate of 10 HKD 150,000 10 HKD 150,000 100.00 70.00 100.00 70.00 33 33 12,322,330 12,322,330 TRC Engineering LLC* Construction services Oman Sultanate of Omani Rial 250,000 Omani Rial 250,000 70.00 70.00 13,654,506 13,654,506 Oman Omani Rial Omani Rial Held by Olive Technology Company Limited Mahat Company Limited Data management Thailand 1,000,000 1,000,000 59.98 59.98 599,800 599,800 and processing Baht Baht Total 27,266,669 27,066,669 Less : Allowance for loss on impairment of investment (25,976,836) (25,976,836) Total investments in subsidiaries which are held by the Company’s subsidiaries - net 1,289,833 1,089,833 * The financial statements of the subsidiary were prepared by the management of the subsidiary and not reviewed by other auditors.

Investments in Subsidiaries. Investments Details of investments in subsidiaries as presented in the separate financial statements which use the cost method are as follows follows: Nature Country of Company's name Nature of business incorporation Paid-up capital Shareholding percentage (%) Cost method (Baht) As at June September As at December As at June September As at December As at June September As at December 30, 2021 2019 31, 2020 2018 30, 2021 2019 31, 2020 2018 30, 2021 2019 31, 2020 Company Limited 2018 TRC Investment Limited* infrastructure Holding company The Republic of Baht Mauritius 1 USD Baht 1 USD 100.00 100.00 32 32 Mauritius TRC Utility Company Limited Olive Technology To produce and distribute tap water Data management and Thailand Thailand 250,000 Baht 850,000 250,000 Baht 250,000 99.97 49.97 99.97 49.97 249,925 424,745 249,925 124,925 Company Limited processing water Baht Baht Total 621,569,393 621,269,573 621,144,648 621,144,648 Less : Allowance for loss on impairment of investment (145,071,416) (145,071,416) Total investments in subsidiaries - net 476,497,977 476,198,157 * The financial statements 476,073,232 476,073,232 On August 14, 2019 the Board of Directors’ Meeting No.8/2562 had a resolution to approve the company to establish 1 new subsidiary were prepared by in order to operate an automatic warehouse. Presently, it is under the management process of the subsidiary company registration and not reviewed by other auditors. TRC CONSTRUCTION PUBLIC COMPANY LIMITED AND ITS SUBSIDIARIES NOTES TO INTERIM FINANCIAL STATEMENTS (CONT.) JUNE 30, 2021 Olive Technology Company Limited During January 14-18, 2021, Olive Technology Company Limited. had received the capital increase fund from the shareholders amounted Baht 0.60 million, or 60%establishment. Details of investments in subsidiaries which are held by the Company’s subsidiaries are as follows: Nature Country of Company's name of business incorporation Paid-up capital Shareholding percentage (%) Cost method (Baht) As at September As at December As at September As at December As at September As at December Held by Sahakarn Wisavakorn Company Limited As at June 30, 2021 As at December 2019 31, 2020 As at June 2018 30, 2021 As at December 2019 31, 2020 As at June 2018 30, 2021 As at December 2019 31, 2020 2018 Hydrotek Sahakarn Joint Venture Held by TRC Investment Limited Construction services Thailand 1,000,000 Baht 1,000,000 Baht 49.00 49.00 490,000 490,000 Saha Hydro Pattaya Joint Venture Held by TRC Investment Limited Construction services Thailand 200,000 Baht - 100.00 - 200,000 - TRC International Limited* Holding company Hong Kong 10 HKD 10 HKD 100.00 100.00 33 33 Held by TRC International Limited TRC Middle East LLC* Holding company Construction services Hong Kong Sultanate of 10 HKD 150,000 10 HKD 150,000 100.00 70.00 100.00 70.00 33 33 12,322,330 12,322,330 Oman Omani Rial Omani Rial TRC Engineering LLC* Construction services Oman Sultanate of Omani Rial 250,000 Omani Rial 250,000 70.00 70.00 13,654,506 13,654,506 Oman Omani Rial Omani Rial Held by Olive Technology Company Limited Mahat Company Limited Data management Thailand 1,000,000 1,000,000 59.98 59.98 599,800 599,800 and processing Baht Baht Total 27,266,669 27,066,669 Less 26,466,869 26,466,869 Less: Allowance for loss on impairment of investment (25,976,836) (25,976,836) Total investments in subsidiaries which are held by the Company’s subsidiaries - net 1,289,833 1,089,833 490,033 490,033 * The financial statements of the subsidiary were was prepared by the management of the subsidiary and not reviewed by other auditors. Sahakarn Wisavakorn Company Limited, which is the Company’s subsidiary, and Hydrotek Public Company Limited agree that the subsidiary will be responsible for project execution of Hydrotek Sahakarn Joint Venture whereas Hydrotek Public Company Limited will not share any gain and loss as well as damage maybe arisen from this project. On March 10, 2016, the Meeting No. 3/2016 of the Company’s Board of Directors passed a resolution to approve the closure of TRC Middle East LLC and TRC Engineering LLC. On September 30, 2019, these subsidiaries have been in the liquidation process.

Investments in Subsidiaries. Investments in subsidiaries in the separate financial statements which use the cost method are as follows follows: In Baht Country of Company's name Nature of business incorporation Paid-up capital Shareholding percentage (%) registration Cost method (Baht) As at June As at December As at June As at December As at June As at December 30, 2021 31, 2020 30, 2021 31, 2020 30, 2021 31, 2020 Company Limited TRC Investment Limited* infrastructure Holding company The Republic of Baht 1 USD Baht 1 USD 100.00 100.00 32 32 Mauritius TRC Utility Company Limited Olive Technology To produce and distribute tap water Data management and Thailand Thailand 250,000 Baht 850,000 250,000 Baht 250,000 99.97 49.97 99.97 49.97 249,925 424,745 249,925 124,925 Company Limited processing Baht Baht Total 621,569,393 621,269,573 Less : Allowance for loss on impairment of investment Cost - net Company's name Business type Shareholding percentage (%) Paid-up capital As at December 31, As at December 31, As at December 31, As at December 31, As at December 31, 2023 2022 2023 2022 2023 2022 2023 2022 2023 2022 Sahakarn Wisavakorn Company Limited Construction services - basic infrastructure Thailand 99.99 99.99 500,000,000 Baht 500,000,000 Baht 620,894,691 620,894,691 (145,071,416) (145,071,416) Total investments in subsidiaries - net 476,497,977 476,198,157 * The financial statements of the subsidiary were prepared by the management of the subsidiary and not reviewed by other auditors. TRC CONSTRUCTION PUBLIC COMPANY LIMITED AND ITS SUBSIDIARIES NOTES TO INTERIM FINANCIAL STATEMENTS (CONT.) JUNE 30, 2021 475,823,275 475,823,275 Olive Technology Company Limited During January 14-18, 2021, Olive Technology Company Limited. had received the capital increase fund from the shareholders amounted Data management and processing Thailand 49.97 49.97 3,100,000 Baht 0.60 million, or 60%. 3,100,000 Baht 1,549,070 1,549,070 - - 1,549,070 1,549,070 Total 622,443,793 622,443,793 (145,071,416) (145,071,416) 477,372,377 477,372,377 Details of investments in subsidiaries which are held by the Company’s subsidiaries are as follows: Nature Country of In Baht Company's name Business type Country of business incorporation Paid-up capital registration Shareholding percentage (%) Paid-up capital Cost method (Baht) Held by Sahakarn Wisavakorn Company Limited As at June 30, 2021 Allowance for loss on impairment of investment Cost method - net As at December 31, 2020 As at June 30, 2021 As at December 31, 2020 As at June 30, 2021 As at December 31, 2020 As at December 31, As at December 31, 0000 0000 0000 2022 2023 2022 2023 2022 2023 2022 Held by Xxxxxxxx Xxxxxxxxxx Company Limited Hydrotek Sahakarn Joint Venture Construction services Thailand - 49.00 - 1,000,000 - 490,000 - - - 490,000 Baht 1,000,000 Baht 49.00 49.00 490,000 490,000 Saha Hydro Pattaya SAHAHYDRO PATTAYA Joint Venture Held by TRC Investment Limited Construction services Thailand 100.00 100.00 200,000 Baht 200,000 Baht 200,000 200,000 - 100.00 - 200,000 - 200,000 TRC International Limited* Limited Holding company Hong Kong 100.00 100.00 10 10 33 33 - - 33 33 HKD HKD Held by TRC International Limited TRC Middle East LLC* Holding company LLC Construction services Hong Kong Sultanate of 10 HKD 150,000 10 HKD 150,000 100.00 70.00 100.00 70.00 33 33 12,322,330 12,322,330 - - - - - - - - - - TRC Engineering LLC* Construction services Oman Sultanate of Omani Rial 250,000 Omani Rial 250,000 70.00 70.00 13,654,506 13,654,506 Oman Omani Rial Omani Rial LLC Held by Olive Technology Company Limited Construction services Oman Sultanate of Oman - - Omani Rial - Omani Rial Omani Rial - Omani Rial - - - - - - Mahat Company Limited Data management and processing Thailand 1,000,000 1,000,000 59.98 59.98 1,000,000 Baht 1,000,000 Baht 599,800 599,800 - - 599,800 599,800 Total 799,833 1,289,833 - - 799,833 1,289,833 Hydrotek Sahakarn Joint Venture On October 31, 2019, the Board of Directors’ Meeting No.2/2019 approved to cease the business operation. As at December 31, 2023 such subsidiary had completed of the liquidation process. TRC Middle East LLC and processing Baht Baht Total 27,266,669 27,066,669 Less : Allowance for loss on impairment TRC Engineering LLC On March 10, 2016, the Meeting No. 3/2016 of investment (25,976,836) (25,976,836) Total investments in subsidiaries which are held by the Company’s subsidiaries - net 1,289,833 1,089,833 * The financial statements Board of Directors passed a resolution to approve the closure of TRC Middle East LLC and TRC Engineering LLC. As at December 31, 2022 both subsidiary's business had been dissolved undergone the liqudation process and ended the status of the subsidiary were prepared by subsidiary. Both subsidiaries had been operating at loss so the management Company has to recognize the loss from the subsidiary's business dissolution in the amount of the subsidiary and not reviewed by other auditors.Baht

Investments in Subsidiaries. Investments in subsidiaries in the separate financial statements which use the cost method are as follows follows: Nature Country of Company's name Nature of business incorporation Paid-up capital Shareholding percentage (%) Cost method (In Baht) As at June March 31, 2022 As at December 31, 2021 As at June March 31, 2022 As at December 31, 2021 As at June March 31, 2022 As at December 3031, 2021 31, 2020 30, 2021 31, 2020 30, 2021 31, 2020 Company Limited TRC Investment Limited* infrastructure Holding company The Republic of Baht ofMauritius 1 USD Baht 1 USD 100.00 100.00 32 32 Mauritius TRC Utility Olive Technology Company Limited Olive Technology To produce and distribute tap water Data management and processing Thailand Thailand 250,000 3,100,000 Baht 850,000 250,000 3,100,000 Baht 250,000 99.97 49.97 99.97 49.97 249,925 424,745 249,925 124,925 Company Limited processing Baht Baht 1,549,070 1,549,070 Total 621,569,393 621,269,573 622,443,793 622,443,793 Less : Allowance for loss on impairment of investment (145,071,416) (145,071,416) Total investments in subsidiaries - net 476,497,977 476,198,157 477,372,377 477,372,377 * The financial statements of the subsidiary were prepared by the management of the subsidiary and not reviewed by other auditors. TRC CONSTRUCTION PUBLIC COMPANY LIMITED AND ITS SUBSIDIARIES NOTES TO INTERIM FINANCIAL STATEMENTS (CONT.) JUNE 30, 2021 Olive Technology Company Limited During January 14-18, 2021, Olive Technology Company Limited. had received the capital increase fund from the shareholders amounted Baht 0.60 million, or 60%. Details of investments in subsidiaries which are held by the Company’s subsidiaries are as follows: Nature Country of Company's name of business incorporation Paid-up capital Shareholding percentage (%) Cost method (In Baht) As at March 31, 2022 As at December 31, 2021 As at March 31, 2022 As at December 31, 2021 As at March 31, 2022 As at December 31, 2021 Held by Sahakarn Wisavakorn Company Limited As at June 30, 2021 As at December 31, 2020 As at June 30, 2021 As at December 31, 2020 As at June 30, 2021 As at December 31, 2020 Hydrotek Sahakarn Joint Venture Construction services Thailand 1,000,000 Baht 1,000,000Baht 1,000,000 Baht 49.00 49.00 490,000 490,000 Saha Hydro Pattaya Joint Venture Construction services Thailand 200,000Baht 200,000 Baht 100.00 100.00 200,000 200,000 Held by TRC Investment Limited Construction services Thailand 200,000 Baht - 100.00 - 200,000 - TRC International Limited* Holding company Hong Kong 10 HKD 10 HKD 100.00 100.00 33 33 Held by TRC International Limited TRC Middle East LLC* Holding company Construction services Hong Kong Sultanate of 10 HKD ofOman 150,000 10 HKD Omani Rial 150,000 100.00 Omani Rial 70.00 100.00 70.00 33 33 12,322,330 12,322,330 TRC Engineering LLC* Construction services Oman Sultanate of ofOman 250,000 Omani Rial 250,000 Omani Rial 250,000 70.00 70.00 13,654,506 13,654,506 Oman Omani Rial Omani Rial Held by Olive Technology Company Limited Mahat Company Limited Data management and processing Thailand 1,000,000Baht 1,000,000 1,000,000 Baht 59.98 59.98 599,800 599,800 and processing Baht Baht Total 27,266,669 27,066,669 Less 27,266,669 Less: Allowance for loss on impairment of investment (25,976,836) (25,976,836) Total investments in subsidiaries which are held by the Company’s subsidiaries - net 1,289,833 1,089,833 1,289,833 * The financial statements of the subsidiary were prepared by the management of the subsidiary and not reviewed by other auditors. Hydrotek Sahakarn Joint Venture As at March 31, 2022 such subsidiary is under liquidation process. TRC Middle East LLC and TRC Engineering LLC As at March 31, 2022, these subsidiaries are now in the company dissolution process.

Investments in Subsidiaries. Investments in subsidiaries in the separate financial statements which use the cost method are as follows follows: Country of In Thousand Baht Company's name Nature of business incorporation Paid-up capital Business type registration Shareholding percentage (%) Paid-up capital Cost method (Baht) As at June Allowance for loss Cost - net As at December As at June 31, As at December As at June 31, As at December 30, 2021 31, 2020 30, 2021 As at December 31, 2020 30, 2021 As at December 31, 2020 2019 2018 2019 2018 2019 2018 2019 2018 2019 2018 Sahakarn Wisavakorn Company Limited TRC Investment Limited* Construction services - basic infrastructure Holding company The Republic of Thailand 99.99 99.99 500,000,000 Baht 1 USD 500,000,000 Baht 1 USD 100.00 100.00 32 32 Mauritius 620,894,691 620,894,691 (145,071,416) (145,071,416) 475,823,275 475,823,275 TRC Utility Company Limited Olive Technology To produce and distribute tap water Data management and Thailand Thailand 250,000 Baht 850,000 99.97 99.97 250,000 Baht 250,000 99.97 49.97 99.97 49.97 Baht 249,925 424,745 249,925 124,925 Company Limited processing Baht Baht - - 249,925 249,925 Total 621,569,393 621,269,573 Less : Allowance for loss on impairment of investment 621,144,648 621,144,648 (145,071,416) (145,071,416) Total investments 476,073,232 476,073,232 On August 14, 2019 the Board of Directors’ Meeting No.8/2562 had a resolution to approve the company to establish a new subsidiary in subsidiaries - net 476,497,977 476,198,157 * The financial statements order to operate an automatic warehouse. Presently, it is under the process of the subsidiary were prepared by the management of the subsidiary company registration and not reviewed by other auditors. TRC CONSTRUCTION PUBLIC COMPANY LIMITED AND ITS SUBSIDIARIES NOTES TO INTERIM FINANCIAL STATEMENTS (CONT.) JUNE 30, 2021 Olive Technology Company Limited During January 14-18, 2021, Olive Technology Company Limited. had received the capital increase fund from the shareholders amounted Baht 0.60 million, or 60%establishment. Details of investments in subsidiaries which are held by the Company’s subsidiaries are as follows: Nature Country of In Thousand Baht Company's name of business incorporation Paid-up capital Business type registration Shareholding percentage (%) Paid-up capital Cost method (Baht) Allowance for loss Cost method - net As at December 31, As at December 31, As at December 31, As at December 31, As at December 31, 2019 2018 2019 2018 2019 2018 2019 2018 2019 2018 Held by Sahakarn Wisavakorn Company Limited As at June 30, 2021 As at December 31, 2020 As at June 30, 2021 As at December 31, 2020 As at June 30, 2021 As at December 31, 2020 Hydrotek Sahakarn Joint Venture Construction services Thailand 49.00 49.00 1,000,000 Baht 1,000,000 Baht 49.00 49.00 490,000 490,000 Saha Hydro Pattaya Joint Venture - - 490,000 490,000 Held by TRC Investment Limited Construction services Thailand 200,000 Baht - 100.00 - 200,000 - TRC International Limited* Limited Holding company Hong Kong 100.00 100.00 10 HKD 10 HKD 33 33 - - 33 33 Held by TRC International Limited TRC Middle East LLC* Holding company LLC Construction services Hong Kong Sultanate of 10 HKD ofOman 70.00 70.00 150,000 10 HKD Omani Rial 150,000 100.00 70.00 100.00 70.00 33 33 Omani Rial 12,322,330 12,322,330 (12,322,330) (12,322,330) - - TRC Engineering LLC* LLC Construction services Oman Sultanate of ofOman 70.00 70.00 250,000 Omani Rial 250,000 Omani Rial 250,000 70.00 70.00 13,654,506 13,654,506 Oman Omani Rial Omani Rial Held by Olive Technology Company Limited Mahat Company Limited Data management Thailand 1,000,000 1,000,000 59.98 59.98 599,800 599,800 and processing Baht Baht (13,654,506) (13,654,506) - - Total 27,266,669 27,066,669 Less : Allowance for loss on impairment of investment 26,466,869 26,466,869 (25,976,836) (25,976,836) Total investments in subsidiaries 490,033 490,033 Sahakarn Wisavakorn Company Limited, which are held by is the Company’s subsidiaries - net 1,289,833 1,089,833 * The financial statements subsidiary, and Hydrotek Public Company Limited agree that the subsidiary will be responsible for project execution of Hydrotek Sahakarn Joint Venture whereas Hydrotek Public Company Limited will not share any gain and loss as well as damage maybe arisen from this project. Later, on October 31, 2019, the Board of Directors’ Meeting No.2/2562 approve to cease the business operation. As at December 31, 2019 such subsidiary is under liquidation process. On March 10, 2016, the Meeting No. 3/2016 of the subsidiary were prepared by Company’s Board of Directors passed a resolution to approve the management closure of TRC Middle East LLC and TRC Engineering LLC. On December 31, 2019, these subsidiaries have been in the subsidiary and not reviewed by other auditorsliquidation process.