Treasury Proposes Sweeping Expansion of U.S. Outbound Investment Controls

On October 22, 2026, the U.S. Treasury issued a notice of proposed rulemaking, with a press release and fact sheet/FAQs, proposing updates to the Outbound Investment Security Program (OISP), the U.S. national-security regime restricting certain U.S.-origin investments into foreign countries of concern. The reporting describes the proposal as a sweeping expansion, with life sciences, biotechnology, artificial intelligence and other technology sectors in focus; the precise revised transaction thresholds, covered-investor definitions, and effective mechanics were not set out in the material reviewed. Why it matters: it broadens the gatekeeping footprint for corporate venture and growth investment, joint development and licensing arrangements, and non-U.S. investor participation in targeted sectors — a cross-client issue for multinationals and their funds rather than a single-sector one. Near-term action: map existing cross-border capital and technology flows against the proposed scope and prepare comments on sectoral definitions and covered transaction parameters before the comment period closes. Watch the comment deadline, any joint implementing guidance, and the shape of the final rule, which remains uncertain; an NPRM imposes no obligations. This is not legal advice.