Key Points:
- President Trump has barred a US semiconductor deal involving photonics firm HieFo and defense company Emcore, citing security risks.
- The White House says HieFo is controlled by a Chinese national and may threaten US security, though specifics remain undisclosed.
- HieFo must divest the acquired assets within 180 days under the executive order tied to the Committee on Foreign Investment in the United States review.
The Trump administration has taken decisive action to block a semiconductor and photonics acquisition that it says poses a national security threat, particularly due to China-related concerns. On January 2, 2026, President Donald Trump issued an executive order halting HieFo Corp’s planned purchase of assets from New Jersey’s Emcore, a firm known for its aerospace and defense technologies.
The contested transaction involved HieFo’s acquisition of Emcore’s chip business and indium-phosphide wafer fabrication operations for roughly $3 million. Trump’s order argues that HieFo is controlled by an individual from the People’s Republic of China, and that allowing the deal to stand could “threaten to impair the national security of the United States.”
The White House did not provide detailed evidence or name the individual associated with HieFo’s ownership. However, officials referenced a review by the Committee on Foreign Investment in the United States (CFIUS). That interagency committee flagged potential risks tied to the deal, although it did not disclose the exact nature of those risks.
Under the terms of Trump’s executive action, the transaction is prohibited, and HieFo must divest all interests and rights in the Emcore technology within 180 days. This timeline gives the company a window to unwind the acquisition or negotiate further under federal oversight, but the ultimate direction rests with government enforcement.
Emcore’s photonics and semiconductor assets have strategic value, particularly in sectors like aerospace and defense. Indium-phosphide chips are used in high-performance communications and sensor systems, areas that the US government often considers sensitive due to their potential military and security applications.
HieFo, a Delaware-organized entity, had previously taken Emcore private following the deal’s completion in 2024. Co-founders included a former Emcore vice president of engineering and a senior sales director, both of whom planned to continue operating the acquired assets under the HieFo banner.
The move represents one of the latest in a series of US government actions tightening scrutiny on foreign involvement in critical technology sectors. It underscores ongoing tensions between Washington and Beijing over access to advanced tech and concerns about foreign influence in sensitive industries.
Industry analysts note that while this particular deal was relatively small in financial terms, the administration’s willingness to intervene reflects broader strategic priorities. Protecting semiconductor supply chains, advanced materials knowledge, and military-adjacent technology has become a key focus amid increased global competition.
The enforcement action also raises questions about how future investments involving foreign interests will be evaluated. CFIUS reviews have expanded in recent years to cover a wider range of technologies and ownership scenarios, and this decision could signal tougher standards going forward, particularly where China is involved.
As HieFo navigates the divestment process, both companies have so far remained publicly silent on the implications. The case illustrates how national security considerations increasingly shape corporate deals in high-tech fields, especially those tied to semiconductors and advanced fabrication capabilities.
