Isu Petasys Plans to Invest 500 Billion Won to Build Seventh Plant in Daegu

Isu Petasys.

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Isu Petasys will invest 500 billion won to build its seventh plant in Daegu.

The company is accelerating capacity expansion amid surging demand for high-layer-count printed circuit boards (PCBs) used in artificial intelligence (AI) accelerators and servers.

Isu Petasys signed a memorandum of understanding (MOU) with Daegu City and Dalseong County on Nov. 2 to build its seventh plant in the Daegu National Industrial Complex. The site covers approximately 168,595 square meters, about eight times the size of the 21,382-square-meter site for its fifth plant, for which an investment agreement was signed in August 2024.

The latest investment decision comes before the completion of the company’s existing plant expansion projects. In November 2024, Isu Petasys disclosed plans to invest 400 billion won in expanding equipment at its existing first through fourth plants and constructing a fifth plant. The investment is scheduled for completion by the end of 2028.

The company has also established a separate sixth plant. In November 2025, Isu Petasys signed an investment agreement worth 50.3 billion won with Daegu City to establish drilling process production facilities in the Dalseong Second Industrial Complex. Daegu City currently puts the investment in the sixth plant at approximately 60 billion won. Construction has been completed, and the plant is preparing to begin full-scale production.

Additional capital expenditure is also under consideration. In August 2026, Isu Petasys said it was reviewing plans to invest an additional 150 billion won to 160 billion won in manufacturing equipment and auxiliary facilities at the sixth plant. The investment is intended to secure production capacity for key processes ahead of schedule. At the time, the company said it could begin ordering and installing equipment as early as the second half of 2026.

Isu Petasys is pursuing successive large-scale investments as demand for high-performance PCBs increases with the expansion of AI infrastructure. PCBs used in AI accelerators and high-speed networking equipment have more layers and require more complex manufacturing processes than conventional products. Increasing production volumes also requires expanding processing capacity for key operations such as lamination, plating and drilling.

All of Isu Petasys’ domestic manufacturing facilities are located in Daegu. Its first through fifth plants are in the Dalseong First Industrial Complex, while the sixth plant is in the Dalseong Second Industrial Complex. The seventh plant will be its first facility in the Daegu National Industrial Complex.

Daegu City will expand infrastructure, including electricity and water supplies and wastewater treatment facilities, to support construction of the seventh plant. It plans to double the daily treatment capacity of the national industrial complex’s wastewater treatment plant from 5,000 tons to 10,000 tons. The city will also upgrade processes for treating high-concentration wastewater and support the permits and approvals required for plant construction.

“We will strive to faithfully implement the investment plan,” Isu Petasys said in a regulatory filing. “The investment period and amount are currently under review, and details may change depending on the outcome of discussions.”