On Monday, the U.S. Department of the Treasury unveiled a regulatory proposal in the Federal Register aimed at implementing controls on American investments in sensitive technologies. This initiative stems from legislation enacted in December 2025.
The U.S. government has expanded its list of "countries of concern" to now include Cuba, alongside China—covering Hong Kong and Macao—Iran, North Korea, Russia, and Venezuela, which is under the regime of Nicolás Maduro, according to the official document.
Identified as 2026-21786, the document elaborates on the Comprehensive Overseas Investment National Security Act (COINS Act), which was passed in December 2025 as part of the National Defense Authorization Act for the fiscal year 2026.
The Department of the Treasury announced the proposal on October 22 via an official press release. Cuba's inclusion as a "country of concern" had already been anticipated in the COINS Act, approved by Congress.
The proposal outlines the procedures for enforcing controls on specific U.S. investments in sensitive technology sectors. These include transactions that must be reported and those that are outright prohibited.
Key Sectors Affected
The sectors impacted encompass semiconductors and microelectronics, superintelligence systems, quantum information technologies, high-performance computing, hypersonic systems, and, notably, biotechnology.
This addition, made by Treasury Secretary Scott Bessent under his discretionary authority, extends beyond the five sectors initially listed by Congress. Biotechnology's inclusion is particularly significant for Cuba, given the substantial role of its pharmaceutical-biotechnological industry centered around BioCubaFarma. This sector has actively sought foreign investment in recent years through partnerships with Russia, Vietnam, and Brazil.
Prohibited technologies in this field include biological systems engineering to modify agents under export controls, advanced pharmaceutical compounds, brain-computer interfaces, and biosequencing equipment, among others.
Regulatory Framework and Exceptions
The program distinguishes two levels of obligation: notifiable transactions, which are permissible but must be reported to the Treasury within 30 calendar days post-closure, and prohibited transactions, which cannot proceed unless an exemption is granted by the Secretary for national interest reasons.
Violations can lead to civil penalties up to $250,000 or double the infringing transaction's value, and the Treasury may enforce divestment.
Notable exceptions include investments in publicly traded securities, index and exchange-traded funds (ETFs), limited partner stakes in non-U.S. funds with committed capital not exceeding $2,000,000, and transactions whose added value over the past 12 months is under $50,000. The latter applies only to notification exemptions, not prohibited operations.
This proposal does not amount to a blanket ban on all U.S. investments in Cuba, nor does it affect remittances, travel, personal-use medications, or total scientific collaboration. It remains a draft regulation under public consultation, not an active requirement.
"The proposed regulations would bolster our existing program to prevent adversaries from leveraging U.S. investment to develop critical technologies that threaten U.S. national security," stated Secretary Bessent.
Regulatory Pressure and Cuban Developments
This proposal adds to an escalating regulatory pressure on Cuba. In recent months, the Trump administration imposed sanctions on Cuban entities linked to military technology, including Tecnoimport, Tecnotex, and the Union of Military Industry, among others.
Simultaneously, the Cuban regime has opened ETECSA's data centers to foreign investment as part of a package of 176 economic reforms announced in June.
The deadline for submitting written comments on the proposal is December 7, 2026, via regulations.gov. According to the Treasury, "the final rule, along with its effective date, will be published at a later stage."
Understanding U.S. Investment Restrictions in Cuba
What sectors are affected by the new U.S. investment restrictions in Cuba?
The affected sectors include semiconductors and microelectronics, superintelligence systems, quantum information technologies, high-performance computing, hypersonic systems, and biotechnology.
Why was biotechnology included in the investment restrictions?
Biotechnology was included due to its critical role in Cuba's pharmaceutical industry, which has been actively seeking foreign investment. This addition aims to prevent adversaries from using U.S. investments to advance sensitive technologies.
Are there any exceptions to the investment restrictions?
Yes, exceptions include investments in publicly traded securities, index and exchange-traded funds (ETFs), and certain limited partner stakes. Additionally, transactions with an added value under $50,000 in the previous year are exempt from notification requirements.
What are the consequences of violating these restrictions?
Violations can result in civil penalties up to $250,000 or double the transaction's value, and the Treasury may enforce divestment of the involved assets.