Company Overview

SK ecoplant’s semiconductor·display materials subsidiaries (SK materials performance, SK trichem, SK resonac, and SK materials jnc) are solidifying their positions as “Global Top Material Solution Providers” through innovative technology development and continuous global expansion in the advanced materials industry, particularly in the semiconductor and display sectors. Through joint ventures with leading global companies, these subsidiaries develop and produce precursors and etching gases. Leveraging their cutting-edge R&D capabilities, they have expanded their offerings to include photolithography and semiconductor back-end (Advanced Package) materials, thereby completing a comprehensive portfolio covering the entire semiconductor manufacturing process. Additionally, in the OLED display sector, SK ecoplant’s semiconductor·display materials subsidiaries have successfully developed next-generation red, green, and blue dopant materials, earning customer recognition for technological expertise. Moving forward, they aim to develop and supply materials that align with customers’ technology roadmaps in a timely manner, and to emerge as leaders in the global advanced materials market.

General Information

Category	Details
Company Name	SK materials performance
CEO	Chang-Rock Song
Date of Establishment	February 10, 2020
Business Areas	Manufacture and sale of photoresists, adhesives, and encapsulants for the semiconductor industry
Number of Employees	219 (as of December 31, 2025)
Head Office Address	130, Myeonghaksandan-ro, Yeondong-myeon, Sejong-si, 7-9, Dongtansandan 2-gil, Hwaseong-si, Gyeonggi-do
Website	www.sk-materials.com/new/eng/html/subsidiary/performance.asp

Category	Details
Company Name	SK trichem
CEO	Jung-Hwan Ha
Date of Establishment	July 27, 2016
Business Areas	Manufacture and sale of precursors
Number of Employees	183 (as of December 31, 2025)
Head Office Address	110-5, Myeonghaksandan-ro, Yeondong-myeon, Sejong-si
Website	www.sk-materials.com/new/eng/html/subsidiary/trichem.asp

Category	Details
Company Name	SK resonac
CEO	Shin Yoo
Date of Establishment	June 1, 2017
Business Areas	Manufacture and sale of etching gases
Number of Employees	69 (as of December 31, 2025)
Head Office Address	71 Gaheunggongdan-ro, Yeongju-si, Gyeongsangbuk-do
Website	www.sk-materials.com/new/eng/html/subsidiary/resonac.asp

Category	Details
Company Name	SK materials jnc
CEO	Jung-Hwan Ha
Date of Establishment	December 28, 2020
Business Areas	Manufacture and sale of OLED materials
Number of Employees	72 (as of December 31, 2025)
Head Office Address	11F, 560, Dongtangiheung-ro, Hwaseong-si, Gyeonggi-do
Website	www.sk-materials.com/new/eng/html/subsidiary/jnc.asp

Business Areas

Category	Main Business
Photolithography & Packaging Materials (SK materials performance)	A photoresist is a light-sensitive material and an essential component used in the photolithography process to form ultra-fine circuits on wafers. Leveraging its cutting- edge R&D capabilities, SK materials performance develops and produces materials essential for semiconductor manufacturing, such as photoresists, BARC (Bottom Anti-Reflective Coating), and SOC (Spin-On Carbon: a carbon-based hard mask material). The company develops and supplies a variety of materials used in semiconductor back -end processes (Advanced Packaging), such as liquid encapsulants and thermal interface materials (TIM), and is expanding its business into the Wet Chem sector (including PMA and EUV Rinse) to become a leading specialist in advanced organic materials. [Key Achievements] Mass production adoption of EUV PR materials for next-generation devices
Precursors (SK trichem)	Precursors are used in the deposition process, which involves building up a thin film of the desired material layer by layer on a wafer through chemical reactions. As the importance of deposition processes has grown due to the recent trend toward semiconductor miniaturization and the expansion of stacked structures, demand for precursors has been steadily increasing. SK trichem produces a variety of precursors used in semiconductors, including High-k, Low-k, and Metal precursors. In particular, the company boasts the world’s largest production capacity for organometallic precursors (CpHf) containing hafnium and is strengthening its quality control capabilities based on its expertise in facility operations and state-of-the-art analytical equipment. Leveraging its R&D capabilities, the company has secured numerous patents and is enhancing its capacity to develop new materials through R&D collaborations with customers as well as academic and industrial institutions. [Key Achievements] Adoption of TEB (triethyl borate) and TEPO (triethyl phosphate) for mass production
Etching Gases (SK resonac)	Etching gases are used in the process of removing unwanted parts during the formation of semiconductor circuits, and are essential materials for precision semiconductor manufacturing. SK resonac has achieved the localization of etching gases and strengthened Korea’s self-reliance in semiconductor materials. Based on its synthesis process, the company is the only one in Korea to operate production facilities for CH₃F (monofluoromethane) and HBr (hydrogen bromide), enabling it to reliably supply high-purity etching gases. Furthermore, leveraging its accumulated technology and capabilities, the company is committed to developing and producing etching gases that meet the diverse needs of its customers. [Key Achievements] Commencement of mass production of HBr (hydrogen bromide)
Blue Dopants (SK materials jnc)	Blue dopant is one of the three(blue, green and red) primary color-producing materials of the OLED emissive layer, which is essential for emitting blue light. Because of its short wavelength and lifetime, developing and synthesizing blue dopant poses a greater challenge than other materials when it comes to achieving both high image quality and a long lifespan for OLED displays. SK materials jnc, a subsidiary of SK ecoplant, is a joint venture established by combining JNC’s IP competitiveness—based on its extensive R&D database—with the SK Group’s capabilities in business development, production, quality, and marketing. The company develops and supplies blue dopant, a core material for OLEDs. Furthermore, by leveraging proprietary technology based on boron-related patents, it is strategically collaborating with global corporations and universities in South Korea, the United States, Japan, and China on materials for various OLED layers. Through these partnerships, SK materials jnc aims to provide integrated solutions to customers and lead technological advancements in the OLED materials market. [Key Achievements] Expanding global market share of blue dopant; pioneering a new market for green dopants.

2025 ESG Highlights

SK materials performance received a commendation from the Minister of Science and ICT in the 2025 Certification of Exemplary Laboratories in Safety Management. 11 of its laboratories were certified as laboratories with excellent safety management, thereby earning external recognition for the company’s high standards of safety management. SK trichem contributed to resource circulation by achieving a waste recycling rate of 95.62% in 2025, and is promoting mutually beneficial supply chain activities by providing quality analysis support to 271 Biz. Partners annually. SK resonac has maintained the highest PSM (Process Safety Management) rating of Grade P since 2023. The company has also achieved “Zero” for both LTIR (Lost Time Injury Rate) and OIRF (Occupational Illness Rate Frequency) for four consecutive years, realizing an accident-free workplace. SK materials jnc has obtained and maintained certification as a “Workplace Recognized for Excellence in Risk Assessment” since 2024 and is strengthening its SHE management by achieving a 69% production plant waste recycling rate, among other initiatives.

ESG Management Strategies and Activities

The ESG management strategies and detailed activities of SK materials performance, SK trichem, SK resonac, and SK materials jnc can be viewed via the website link below.

Semiconductor & Display Materials Subsidiaries ESG Management Website