Visa E-2: Treaty Investors

The E-2 nonimmigrant classification allows a national of a treaty country (a country with which the United States maintains a treaty of commerce and navigation, or with which the United States maintains a qualifying international agreement, or which has been deemed a qualifying country by legislation) to be admitted to the United States when investing a substantial amount of capital in a U.S. business. Certain employees of such a person or of a qualifying organization may also be eligible for this classification.

Description from USCIS Website.