The global semiconductor industry’s race to supply advanced memory for artificial intelligence is increasing the strategic value of technologies that help manufacturers test chips and maintain production quality. For U.S. semiconductor companies and investors, South Korea’s latest probe into alleged technology theft highlights a risk that extends beyond fabrication capacity and capital spending: the loss of proprietary engineering expertise to overseas competitors can weaken a company’s market position and undermine years of research and development.
On October 14, 2026, South Korean authorities announced criminal charges against three former employees of a domestic semiconductor equipment company accused of stealing probe card technology and using it to manufacture products overseas. One suspect was arrested and indicted, while two others were indicted without detention. Investigators have also requested an Interpol Red Notice for an alleged ringleader who remains overseas.
The case centers on probe cards, specialized components used to test semiconductor chips for defects while they are still on silicon wafers. The technology is critical to manufacturing quality, particularly as advanced memory products become more complex and demand grows for high-bandwidth memory, or HBM, used in AI computing systems.
According to investigators, the suspects allegedly worked with an overseas distributor that had handled the Korean company’s local sales to establish a foreign manufacturing business. Between November 2023 and February 2026, they allegedly used the company’s technical drawings and confidential materials to produce equipment for major overseas customers.
The three former employees reportedly joined the overseas venture after its president, a former executive at the Korean company, offered them twice their previous salaries. The alleged ringleader, identified as D, is accused of orchestrating the scheme while remaining outside South Korea.
The potential financial damage is substantial. The victim company estimated that losing its overseas markets could cost it about 40 billion won a year in revenue, equivalent to approximately $28.6 million at an illustrative exchange rate of 1,400 won per dollar.
The company had developed its probe card technology domestically after years of research, entering a market in which U.S. and Japanese suppliers have historically held strong positions. It later expanded into equipment for testing HBM and supplies major semiconductor manufacturers in South Korea and overseas. The alleged theft could therefore threaten both its intellectual property and its ability to compete in a strategically important segment of the chip supply chain.
The investigation began in July 2025 after South Korea’s National Intelligence Service provided information to investigators. The suspects’ presence overseas complicated evidence collection. Authorities subsequently searched a domestic design company used by the foreign manufacturer for procurement and engineering work, recovering technical drawings and other materials belonging to the victim company.
Investigators with semiconductor research and development experience examined the seized documents and concluded that materials with their original sources removed had been created or modified using the victim company’s technology, according to the authorities.
The prosecution adds to a broader series of South Korean cases involving alleged transfers of semiconductor know-how to overseas competitors. In a separate case, the Seoul Central District Court sentenced a former Samsung Electronics researcher to seven years in prison on April 22, 2026, over the alleged transfer and use of Samsung’s 18-nanometer DRAM manufacturing technology by China’s ChangXin Memory Technologies.
The Samsung case demonstrates the potentially severe consequences of semiconductor technology theft when courts find criminal liability. But the two cases remain legally distinct, and the seven-year sentence in the Samsung matter does not determine the eventual outcome of the probe card prosecution.
For investors, the broader issue is how effectively semiconductor companies can protect technical knowledge as competition intensifies across advanced memory, inspection equipment and AI-related manufacturing. Patents and physical production capacity are only part of a company’s competitive defenses; confidential process data, engineering documentation and specialized employee expertise can be equally valuable.
South Korean authorities said they would continue coordinating investigations and prosecutions to combat overseas technology theft. The defendants in the probe card case have been indicted, but their guilt has not yet been established by a final court judgment.
