Bottom line: Treasury has proposed regulations implementing Subtitle C of the Comprehensive Outbound Investment National Security Act (Title VIII of the Defense Production Act). Written comments are due December 7, 2026.

Key points

• The proposed rule would require U.S. persons to notify Treasury of certain transactions involving foreign persons engaged in notifiable technologies.
• It would prohibit U.S. persons from engaging in certain other transactions involving foreign persons engaged in prohibited technologies.
• Where consistent with Title VIII, it incorporates definitions and concepts from the current Outbound Investment Security Program regulations.
• It would add applicability dates so the current regulations continue to apply to activities within the relevant timeframe.

By the numbers

• Oct. 26, 2026 — Federal Register publication date
• Dec. 7, 2026 — comment deadline
• Document number: 2026-21786

Source: Federal Register, document 2026-21786 (Treasury Department, Investment Security Office), retrieved October 25, 2026.